Pressure & Flame Protection

Pressure & Flame Protection Safety Relief Valves

Safety Relief Valves WB SERIES SPRING LOADED SAFETY RELIEF VALVES The WB is designed safely relieve excess pressure in pumps, pipework, tanks, calorifiers, gas and oil separars and other process vessels. It is suitable for gas, steam, vapour and liquid applications. The WB conforms API 526 pressure/temperature ranges, orifice areas and dimensions. SAFEFLO SAFETY AND THERMAL RELIEF VALVES Safeflo valves are designed for similar duties the WB but for small capacity applications.they safely relieve thermal expansion of process fluids in vessels and long lengths of pipework, and are suitable for gas and liquid applications. SAFESET PILOT OPERATED SAFETY RELIEF VALVES Safeset valves are self contained pilot operated safety relief valves which use the system pressure control the valve opening and closing. No other source of energy is required. A choice of different types of Safeset pilot valves are available, including pop and modulating action suit a variety of applications. 1 Safeset valves conform API 526 pilot operated pressure/temperature ranges and dimensions, with multiple orifice areas contained within each valve body size.

CONTENTS Page Birkett Range 3 Introduction 4 International approvals and authorisations 5 WB Series 6 Features and benefits 7-10 Valve types and action 11-14 Drawings 15-16 Accessories 17 Figure numbering system 18 Material temperature ranges 19-46 Valve selection charts, D T 47-48 Valve adjustment 49-50 Seat tightness/seat leakage testing Page Sizing 81-82 Sizing formula 83 Nomenclature 84 Back pressure/blowdown limits and orifice areas 85-90 Sizing facrs 91-96 Capacity charts 97 Reaction forces 98 Definitions 98 Definitions of terms 99 Operational characteristics 100 Pressure term relationships 51 Safeflo 52 Features and benefits 53-54 Drawings 55 Accessories 56 Figure numbering system 57-58 Dimensions 59 Safeset 60 Features and benefits 61 Dual Outlet/Full Bore Pilot Valve 62 Pilot types and basic operation 63-64 Type 2 - Pop Action Pilot 65-68 Type 4 and 8 - Modulating Action Pilot 69 Technical specification 69-70 Drawings and materials of construction 71-75 Accessories 76 Figure numbering system 77-78 Dimensions 79-80 Operating pressure/temperature limits 2

Safety Relief Valves INTRODUCTION The effects of exceeding safe pressure levels in an unprotected pressure vessel or system can have catastrophic effects on both plant and personnel. Safety relief valves should be used protect any pressurised system from the effects of exceeding its design pressure limit. A safety relief valve is designed aumatically discharge gas, steam, vapour or liquid from any pressure containing system, preventing a predetermined safe pressure being exceeded, and protecting plant and personnel. The Birkett range of safety relief valves contains three distinct valve types: WB Series spring loaded safety relief valves. Safeflo safety and thermal relief valves. Safeset pilot operated safety relief valves. All types are certified in accordance with ASME Code Section VIII. All Birkett valves are available through our global agent distribution network supported by our own regional sales offices around the world. 3

INTERNATIONAL APPROVALS AND AUTHORISATIONS Our approvals and accreditations include ISO 9001:2008, ASME, Chinese Safety Quality Licence, TUV, Bureau Veritas, Somwezen, PED, ATEX and GOST-R. APPLICABLE STANDARDS ISO 9001:2008 Quality Standard ASME Code Section VIII All valves are UV certified API 520 : Part 1 Sizing and selection API 526 Dimensions API 527 Leakage Rates ANSI B16.5 Flange Ratings 4

WB Series - Spring loaded safety relief valve 1 Insitu testing 2 Accessories 3 High performance springs 4 Bellows back up pisn (not shown) 5 Guiding 6 Bellows (not shown) 7 Trim 8 Seat integrity 9 Adjustable blow down 10 Nozzle design 11 API 526 face face dimensions 5

FEATURES AND BENEFITS Design verification all design options and the various effects of system conditions, back pressure etc. have been verified on Birkett s in-house, extensive mass flow test facility. Lighter and more compact construction continuous design improvements have created smaller and lighter valves support current industry design trends, especially space and weight savings. Interchangeable parts valves can be modified from type type, gas, liquid, conventional and bellows simply by changing only a few parts. Simplified maintenance and service - re-engineering has reduced the number of parts, making maintenance easier and more cost effective. Material selection a wide range of materials are offered including non-ferrous for low temperature and oxygen service, as well as exotic alloys specifically for the chemical and process industries. Cryogenic and oxygen service Birkett s state-of-the-art clean room and vapour degreasing facilities ensure compliance with the stringent demands of cryogenic and oxygen applications. 1 In-situ testing valves can be supplied suitable for application of in-situ set pressure verification devices. 2 Wide range of accessories available comply with international codes and suit system requirements. 3 High performance springs safety relief valve springs are specifically designed guarantee set point repeatability. 4 Bellows back-up pisn an optional auxiliary back-up pisn for balanced bellows valves ensures fail-safe operation in the event of bellows failure (see page 16). 5 Guiding surfaces the material selection of guiding components, gether with a selfaligning disc and spindle pivot point, ensures correct alignment and no galling of guiding surfaces. 6 Bellows ensures correct valve performance under difficult back pressure conditions (see page 12). 7 Trim specific gas and liquid trim designs give stable operation and eliminate the damaging effect of chatter. 8 Seat leakage integrity choice of nozzle and disc materials (coupled with superior lapping techniques) provides seat tightness API 527/ASME VIII. 9 Adjustable blow down the valve reseating pressure (blow down) can be simply adjusted suit special or specific performance requirements. 10 Nozzle design the method and location of attachment the body avoids transmission of pipe stresses the nozzle/disc mating surfaces. 11 API 526 dimensions standardised dimensions allows pipework layouts be detailed confidently. 6

DIFFERENT TYPES There are four basic types of WB Series safety relief valve: WB400 conventional gas type. WB300 bellows gas type. WB200 conventional liquid type. WB100 bellows liquid type. Conventional safety relief valves: Can be used on systems where the discharge is relatively simple. The pressure in the discharge system can be atmospheric, at a constant level or where the pressure may build up a maximum of 10% of the set pressure. When a constant back pressure exists, the valve should be set at the differential pressure (refer page 8). Liquid service Valves operating on liquid service require a modified valve design cope with the differing dynamics of liquid flow. A conured plug disc is used minimise initial flow rate, eliminating any potential inlet pressure drops due excessive valve lift. The valve will simmer until sufficient pressure is available generate lift. Once this has occurred, the lift will stabilise suit the flow and pressure conditions required, thus avoiding the problem of chatter. Chatter is the rapid opening and closing of the valve which can have a damaging effect on the disc and nozzle, causing it leak. Bellows safety relief valves: The WB Bellows Valves are statically balanced and can be used on more complex discharge systems such as common discharge manifolds and flares where several valves may discharge. This type of system creates a variable superimposed back pressure. The balanced bellows unit cancels out the effects of variable back pressure, on the set pressure of the safety relief valve. Gas and vapour service: The gas/vapour disc can be distinguished by the flat underside, unlike the cone profile of the liquid disc. Typical liquid relief valve disc 7

THE EFFECT OF BACK PRESSURE The configuration of a closed discharge pipework system, typically for xic or hazardous duty, can generate back pressure. Back pressure applied the outlet of the valve will adversely affect its performance, unless it is addressed. Back pressure may take three forms: 1. Superimposed constant back pressure This exists permanently and a conventional or bellows valve can be used. A conventional valve can be set at the differential pressure so that the spring load is adjusted take account of the back pressure. 2. Built up back pressure Built up back pressure is created by the configuration of discharge pipework systems and varies from zero when the valve is closed, a maximum, when fully open. Conventional spring loaded valves can lerate up 10% of set pressure as built up back pressure. For back pressures in excess of 10%, a balanced bellows design is required maintain valve lift. 3. Superimposed variable back pressure This is caused by other valves discharging in a common disposal system, or other circumstances that cause the back pressure be variable. Balanced bellows valves should be used for this condition, adjusted the predetermined set pressure. Constant back pressure - conventional valve Variable back pressure - balanced bellows valve 8

VALVE ACTION Principles of operation spring loaded safety and thermal relief valves SPRING FORCE Safety relief valves use a spring force hold a disc against a nozzle. Under normal system operating pressure, the valve will remain closed as the spring force is greater than the inlet system pressure force. The valve opens when the system pressure force becomes greater than the closing force of the spring. Spring loaded safety and thermal relief valve The WB and B/C series are designed have a short simmer, open rapidly full lift position and then re-seat at a controlled shut off pressure. This is demonstrated in the graph below, which shows the valve action and corresponding pressure at the valve inlet. SYSTEM PRESSURE FORCE POPPING PRESSURE SET PRESSURE RE-SEAT PRESSURE Popping and blowdown The opening and closing characteristics of the valve can be controlled by the adjustment of a blowdown ring, as its position affects the shape and volume of the huddling chamber. When the blowdown ring is adjusted its p position, the exit area from the huddling chamber is restricted its minimum. The valve will pop distinctly with a short simmer and long blowdown. Conversely, when the blowdown ring is in its lowest position there is a maximum exit area from the huddling chamber and the valve will have a longer simmer with a shorter blowdown. The blowdown ring can be positioned between these two extremes give the required performance, but it is usually facry set achieve re-seating 7-10% below set pressure. 9

LIFT CYCLE Stage 1 Closed Inlet pressure < set pressure Inlet pressure is below the set pressure. The valve is closed and there is no flow through the valve. Stage 2 Simmering Inlet pressure is = > set pressure and < popping pressure Inlet pressure increases set pressure. At this point, the spring force and system pressure force are equal; a further rise in inlet pressure will then begin lift the disc slightly. A small amount of fluid is released in the huddling chamber (the valve simmers). The system fluid is now acting on a larger area inside the huddling chamber. Stage 3 Popping and opening Inlet pressure = > popping pressure, valve fully open The inlet pressure acting on a larger area produces a significant force accelerate the opening. A combination of this pressure force, the kinetic energy from the fluid within the nozzle and the deflection force of the fluid flow turning through the reaction hood, is transformed in disc lifting force. The valve pops open at < 5% overpressure and the valve reaches the full open position at 110% of set pressure, in accordance with international codes. Stage 4 Reseating Inlet pressure falls re-seating pressure As system pressure starts fall, the force from the spring begins close the valve. Typically, the system pressure falls between 5-10% below the valve set pressure at which point the spring force accelerates the valve disc re-seat the valve. The difference between the set pressure and the re-seating pressure is known as blowdown. 10

WB 400 - CONVENTIONAL GAS TYPE (up and including class 600) ITEM PART CARBON STEEL STAINLESS STEEL 1 Body SA 216-WCB CARB ST SA 351-CF8M ST ST 2 Casing SA 216-WCB CARB ST SA 351-CF8M ST ST 3 Cap SA 216-WCB CARB ST SA 351-CF8M ST ST 4* Nozzle 316 ST ST 316 ST ST 5* Disc 316 ST ST 316 ST ST 6* Disc holder ASTM A479-316L ASTM A479-316L 8 Blowdown ring SA 351-CF8M ST ST SA 351-CF8M ST ST 9 Guide Assy CARBON ST/17-4 ST ST 316L/17-4 ST ST 10* Spindle ASTM A479-431 ASTM A479-431 11 Lower spring plate ASTM A108-1021/Ni PLT ASTM A479-431 12 Adjusting screw ASTM A479-410 ASTM A479-410 13 Locking nut ASTM A108-1021 ASTM A479-316L 14 Setting screw ASTM A479-431 ASTM A479-431 15 Setting screw rod ASTM A479-316L ASTM A479-316L 18 Stud SA 193-B7 CR/MOL ST SA 193-B8T ST ST 19 Nut SA 194-2H CARB ST SA 194-8T ST ST 22* Spring CARBON STEEL ASTM A313-316 27* Body gasket ST-706 ST-706 28* Cap gasket ST-706 ST-706 29* Set screw gasket ST-706 ST-706 31* Ball AISI 440C ST ST AISI 440C ST ST 32 Upper spring plate ASTM A108-1021/Ni PLT ASTM A479-431 33 Data plate 321 ST ST 321 ST ST 34 Hammer drive screw ELECTRO BRASSED ST ASTM A479-316L 35 Grooved pin ASTM A479-431 ASTM A479-431 42 Drain plug HTS HOLO-KROME ASTM A479-316L 80* Circlip ASTM A313-316 ASTM A313-316 * Recommended spares 11

WB 300 - BALANCED BELLOWS GAS TYPE (up and including class 600) ITEM PART CARBON STEEL STAINLESS STEEL 1 Body SA 216-WCB CARB ST SA 351-CF8M ST ST 2 Casing SA 216-WCB CARB ST SA 351-CF8M ST ST 3 Cap SA 216-WCB CARB ST SA 351-CF8M ST ST 4* Nozzle 316 ST ST 316 ST ST 5* Disc 316 ST ST 316 ST ST 6* Disc holder INCLUDED IN ITEM 23 INCLUDED IN ITEM 23 8 Blowdown ring SA 351-CF8M ST ST SA 351-CF8M ST ST 9 Guide Assy CARBON ST/17-4 ST ST 316 L/17-4 ST ST 10* Spindle ASTM A479-431 ASTM A479-431 11 Lower spring plate ASTM A108-1021/Ni PLT ASTM A479-431 12 Adjusting screw ASTM A479-410 ASTM A479-410 13 Locking nut ASTM A108-1021 ASTM A479-316L 14 Setting screw ASTM A479-431 ASTM A479-431 15 Set screw rod ASTM A479-316L ASTM A479-316L 18 Stud SA 193-B7 CR/MOL ST SA 193-B8T ST ST 19 Nut SA 194-2H CARB ST SA 194-8T ST ST 22* Spring CARBON STEEL ASTM A313-316 23* Bellows assembly ASTM A479-316L/SA240-316L ASTM A479-316L/SA240-316L 27* Body gasket ST-706 ST-706 28* Cap gasket ST-706 ST-706 29* Set screw gasket ST-706 ST-706 31* Ball AISI 440C ST ST AISI 440C ST ST 32 Upper spring plate ASTM A108-1021/Ni PLT ASTM A479 431 33 Data plate 321 ST ST 321 ST ST 34 Hammer drive screw ELECTRO BRASSED ST ASTM A479-316L 35 Grooved pin ASTM A479-431 ASTM A479-431 42 Drain plug HTS HOLO-KROME ASTM A479-316L 80* Circlip ASTM A313-316 ASTM A313-316 * Recommended spares 12

WB 400 - CONVENTIONAL GAS TYPES (class 900 and above) ITEM PART CARBON STEEL STAINLESS STEEL 1 Body SA 216-WCB CARB ST SA 351-CF8M ST ST 2 Casing SA 216-WCB CARB ST SA 351-CF8M ST ST 3 Cap SA 216-WCB CARB ST SA 351-CF8M ST ST 4* Nozzle 316 ST ST 316 ST ST 5* Disc 316 ST ST 316 ST ST 6* Disc holder ASTM A479-316L ASTM A479-316L 7 Reaction hood ASTM A479-431 ASTM A479-431 8 Blowdown ring SA 351-CF8M ST ST SA 351-CF8M ST ST 9 Guide plate 17-4 ST ST 17-4 ST ST 10* Spindle ASTM A479-431 ASTM A479-431 11 Lower spring cap ASTM A108-1021/Ni PLT ASTM A479-431 12 Adjusting screw ASTM A479-410 ASTM A479-410 13 Locking nut ASTM A108-1021 ASTM A479-316L 14 Setting screw ASTM A479-431 ASTM A479-431 15 Setting screw rod ASTM A479-316L ASTM A479-316L 16* Tabwasher BS 1449-304S15 ST ST BS 1449-304S15 ST ST 17* Pinning screw ASTM A479-431 ASTM A479-431 18 Body stud SA 193-B7 CR/MOL ST SA 193-B8T ST ST 19 Body nut SA 194-2H CARB ST SA 194-8T ST ST 20 Casing stud SA 193-B7 CR/MOL ST SA 193-B8T ST ST 21 Casing nut SA 194-2H CARB ST SA 194-8T ST ST 22* Spring CARBON STEEL ASTM A313-316 24* Spindle head ASTM A479-431 ASTM A479-431 27* Body gasket ST-706 ST-706 28* Cap gasket ST-706 ST-706 29* Setting screw gasket ST-706 ST-706 31* Ball AISI 440C ST ST AISI 440C ST ST 32 Upper spring cap ASTM A108-1021/Ni PLT ASTM A479 431 33 Data plate 321 ST ST 321 ST ST 34 Hammer drive screw ELECTRO BRASSED ST ASTM A479-316L 35* Grooved pin ASTM A479-431 ASTM A479-431 42 Drain plug HTS HOLO-KROME ASTM A479-316L * Recommended spares 13

WB 300 - BALANCED BELLOWS GAS TYPE (class 900 and above) ITEM PART CARBON STEEL STAINLESS STEEL 1 Body SA 216-WCB CARB ST SA 351-CF8M ST ST 2 Casing SA 216-WCB CARB ST SA 351-CF8M ST ST 3 Cap SA 216-WCB CARB ST SA 351-CF8M ST ST 4* Nozzle 316 ST ST 316 ST ST 5* Disc 316 ST ST 316 ST ST 6* Disc holder base ASTM A479-321 ASTM A479-321 7 Reaction hood ASTM A479-431 ASTM A479-431 8 Blowdown ring SA 351-CF8M ST ST SA 351-CF8M ST ST 9 Guide plate 17-4 ST ST 17-4 ST ST 10* Spindle ASTM A479-431 ASTM A479-431 11 Lower spring cap ASTM A108-1021/Ni PLT ASTM A479-431 12 Adjusting screw ASTM A479-410 ASTM A479-410 13 Locking nut ASTM A108-1021 ASTM A479-316L 14 Setting screw ASTM A479-431 ASTM A479-431 15 Setting screw rod ASTM A479-316L ASTM A479-316L 16* Tabwasher BS 1449-304S15 ST ST BS 1449-304S15 ST ST 17* Pinning screw ASTM A479-431 ASTM A479-431 18 Body stud SA 193-B7 CR/MOL ST SA 193-B8T ST ST 19 Body nut SA 194-2H CARB ST SA 194-8T ST ST 20 Casing stud SA 193-B7 CR/MOL ST SA 193-B8T ST ST 21 Casing nut SA 194-2H CARB ST SA 194-8T ST ST 22* Spring CARBON STEEL ASTM A313-316 23* Bellows SA240-316L SA240-316L 24* Spindle head ASTM A479-431 ASTM A479-431 25 Pisn ASTM A479-431 ASTM A479-431 26 Guide spindle ASTM A479-321 ASTM A479-3431 27* Body gasket ST-706 ST-706 28 Cap gasket ST-706 ST-706 29 Setting screw gasket ST-706 ST-706 31 Ball AISI 440C ST ST AISI 440C ST ST 32 Upper spring cap ASTM A108-1021/Ni PLT ASTM A479 431 33 Data plate 321 ST ST 321 ST ST 34 Hammer drive screw ELECTRO BRASSED ST ASTM A479-316L 35 Grooved pin ASTM A479-431 ASTM A479-431 42 Drain plug HTS HOLO-KROME ASTM A479-316L 50 Grubscrew ASTM A479-321 ASTM A479-321 * Recommended spares 14

ACCESSORIES Screwed cap This is the standard option on all valves. Bolted cap Option available on the WB Series when required by the cusmer or for critical service where fragile gaskets materials may be fitted. Open lever* The open lever assembly is not pressure tight and is therefore only suitable where vapour can safely be allowed escape atmosphere. Packed lever* The design of the packed lever assembly ensures that leakage does not occur when the valve is open or when back pressure is present. *A lift lever can be used test for correct valve operation where corrosion or deposits could prevent the valve from opening. They can be used release foreign particles trapped on the seat and must be fitted when codes dictate. GAG SCREW SEALING PLUG Test gag The test gag is used prevent the safety valve from lifting. This is mainly used when carrying out a hydrostatic test on the system, during commissioning. After testing, the test gag must be removed and replaced with the sealing plug. 15

FERRULE Ferrule (government ring) A ferrule, sometimes known as a government ring, is a collar fitted beneath the head of the pressure adjusting screw. Some authorities will require a ferrule be fitted prevent unauthorised interference with the set pressure. Soft seat An O-ring seal offers maximum seat tightness, over and above that of the standard metal-metal seats. A wide range of seal materials are available including Vin, Nitrile, Kalrez and PTFE. For high integrity seat leakage, specify soft seat. Steam jacket Some process media can solidify or form crystals if they cool within the system. The medium within the valve nozzle is not in the flow path and thus cooling can occur. Should the medium solidify, crystallise, or if sublimation of vapour was occur within the nozzle, the valve may not lift. The steam jacket is designed keep the process medium hot, helping maximise plant safety. The steam jacket has both an inlet and outlet so that low pressure steam can be passed through the jacket, keeping the valves hot. This allows the valves stay operational, enabling the valve successfully relieve pressure, should an overpressure situation occur. The steam jacket is manufactured out of material that is compatible with the body of the valve and the connections the jacket can either be flanged or screwed. Auxiliary back-up pisn In the event of bellows failure, a potentially dangerous situation can arise. The back pressure causes an out-of-balance situation which may cause: 1 Increase in set pressure. 2 Decrease in flow capacity. 3 Increase in re-seat pressure. Specifying bellows valves with an auxiliary back-up pisn ensures that the above does not occur. The pisn itself has the same effective diameter as the failed bellows, so any effect of the back pressure increasing the set pressure is counteracted by an upward thrust of the pisn. This is an added safety feature. The WB 300 valve has incorporated the auxiliary back-up pisn since its inception. It is available as standard in all pressure classes 900 and above and as an optional feature for class 600 and below. To ensure absolute safety, specify the auxiliary back-up pisn. 16

WB SERIES FIGURE NUMBERING SYSTEM / Inlet diameter 1-8 API orifice letter D - T Outlet diameter 2-10 Design H ANSI 150, 300 and 600 / ANSI 900, 1500 and 2500 Accessories B Auxiliary back-up pisn C Bolted cap D Screwed cap F Ferrule (Government ring) G Test gag H* High Pressure M Open lever P Packed lever R Soft seat S Special feature 3 WB300 Bellows Valve type 1 Liquid bellows 2 Liquid conventional 3 Vapour bellows 4 Vapour conventional ANSI flange rating inlet x outlet 1 150 x 150 2 300 x 150 3 600 x 150 4 900 x 150 5 900 x 300 6 1500 x 150 7 1500 x 300 8 2500 x 300 O Special Flange face 1 ANSI RF x RF 2 ANSI RTJ inlet x RF O Special Trim material nozzle and disc 1 Stainless steel PH 17/4 2 Stainless steel 316 3 Aluminium bronze / Monel 4 Hastelloy B 5 Stainless steel 316 stellited 6 Monel 7 Stainless steel 304 O Special Spring material 1 Carbon steel 2 Stainless steel 316 6 Tungsten alloy 9 Hastelloy B A Aluminium Coated CS N Stainless steel PH 17/4 Q Stainless steel PH 17/4 NACE T Aluminium Coated Tungsten Z Inconel X750 O Special *In some instances when both high pressures and alloy springs are required, the H needs adding accessories. See individual orifice pages. Body material 1 Carbon steel WCB 2 Carbon steel WCB NACE 3 Stainless steel CF8M NACE 4 Stainless steel CF8M 5 Carbon steel low temperature LCB 6 Bronze 8 Carbon steel WC6-0.5% Moly 9 Hastelloy B O Special 17

RECOMMENDED MATERIAL TEMPERATURE RANGES Description Minimum Maximum deg F deg C deg F deg C BODY 1 Carbon steel SA 216-WCB 20 29 800 427 2 Carbon steel (NACE) SA 216-WCB 20 29 800 427 3 Stainless steel (NACE) SA 351-CF8M 450 267 1000 538 4 Stainless steel SA 351-CF8M 450 267 1000 538 5 Low Temp. CS SA 352-LCB 50 46 800 427 6 Bronze (Oxygen spec.) BS 1400 LG2 450 267 450 232 8 0.5% MOLY CS SA 217-WC6 20 29 1000 538 9 Hastelloy B SA 494-N12MV 20 29 1000 538 SPRING 1 Carbon steel 75 59 450 232 A Aluminium coated CS 75 59 450 232 2 Stainless steel (316) 450 267 500 260 6 Tungsten alloy (BH12) 4 20 1000 427 T Aluminium coated tungsten 4 20 1000 427 9 Hastelloy B 20 29 800 427 N Stainless steel (PH17/4) 130 90 752 400 Q Stainless steel (PH17/4 NACE) 130 90 752 400 Z Inconel X750 450 267 1000 538 TRIM (Nozzle and disc) 1 Stainless steel (PH 17/4 NACE 29-33 HRC) 130 90 752 400 2 Stainless steel (316) 450 267 1000 538 3 Al. Bronze/Monel 76 60 572 300 4 Hastelloy B 20 29 1000 538 5 Stainless steel (316 Stellited 39-43 HRC) 321 196 1000 538 6 Monel 321 196 800 427 7 Stainless steel 304 238 150 1000 538 GASKETS NAF (ST-706) 40 40 800 427 Graphite (Supergraf) 328 200 932 500 Gylon 3504 321 196 500 260 SOFT SEAT Nitrile 40 40 212 100 Vin 22 30 392 200 Silicon 85 65 446 230 Ethylene Propylene 58 50 275 135 PTFE 454 270 428 220 Kalrez 20 29 500 260 BOLTING B7 Alloy steel 20 29 800 427 B8T Stainless Steel 454 270 1000 538 Monel K500 274 170 482 250 Notes 1 All temperatures are at valve inlet. 2 Trim items 1 and 5 are recommended for maximum durability. 3 Alternative materials may be specified if agreed on enquiry. 18

VALVE SELECTION GUIDE D 0.110 in 2 71 mm 2 TEMPERATURE LIMITS API 526 538 1000 427 800 232 450-29 -20-59 -75-268 -450 SPRING BODY STAINLESS STEEL CARBON STEEL TUNGSTEN SS - CF8M CARBON STEEL - WCB CS - WC6 SET PRESSURE - PSIG 0 7 8 9 10 11 1 2 3 4 5 6 12 13 14 15 16 17 1000 538 500 900 450 800 400 700 350 600 300 500 250 400 200 300 150 100 200 50 100 0 0-50 -100-100 -200-150 -300-200 -400-250 -450-268 100 200 300 400 500 1000 2000 3000 4000 5000 6000 SET PRESSURE - BAR G. 0 10 20 30 34.5 50 69 100 200 300 413.8 ORIFICE D (All dimensions in inches) Size Rating A B C* D E F G H Wt (ins) lbs (kg) 1 x 2 150 x 150 4.125 1.437 13.875 4.500 0.582 2 3/8 3/4 40 (18) 300 x 150 4.125 1.437 13.875 4.500 0.582 2 3/8 3/4 40 (18) 600 x 150 4.125 1.437 13.875 4.500 0.582 2 3/8 3/4 42 (19) 1 1 /2 x 2 900 x 300 4.125 1.750 25.000 5.500 0.625 5 3/8 3/4 90 (41) 1500 x 300 4.125 1.750 25.000 5.500 0.625 5 3/8 3/4 97 (44) 1 1 /2 x 3 2500 x 300 5.500 2.375 26.875 6.500 0.625 5 3/8 3/4 115 (52) * If a gag is fitted, add 0.5 ins. If a bellows is fitted in the 1 x 2 inch valve add 1.125 inch. If a lever is fitted, add a maximum of 3.5 inch. (Only if flange rating is 600# or less.) For certified height (c), consult facry. Vent hole H on bellows valves only. 19

VALVE SELECTION TABLE D 0.110 in 2 71 mm 2 Flanges ANSI Key Valve size No. inlet x outlet Inlet Outlet Body (ins) Mat l -76 F -450 F -60 C -268 C Max. Set Pressure (psig) and Temperature Limits -21 F -75 F -30 C -59 C 100 F -20 F 38 C -29 C 450 F 800 F 1000 F 232 C 427 C 538 C Max. Back Pressure (psig) Conventional Valve Balanced Bellows Valve 1 1 x 2 150#RF 150#RF - - 285 185 80-285 230 2 1 x 2 300#RF 150#RF - - 740 615 410-285 230 3 1 x 2 600#RF 150#RF - - 1480 1235 825-285 230 WCB 4 1 1 /2 x 2 900#RF 300#RF - - 2220 1845 1235-600 500 5 1 1 /2 x 2 1500#RF 300#RF - - 3705 3080 2060-600 500 6 1 1 /2 x 3 2500#RF 300#RF - - 6000 5135 3430-740 500 7 1 x 2 300#RF 150#RF - - - - 510 225 285 230 8 1 x 2 600#RF 150#RF - - - - 1015 445 285 230 9 1 1 /2 x 2 900#RF 300#RF WC6 - - - - 1525 670 600 500 10 1 1 /2 x 2 1500#RF 300#RF - - - - 2540 1115 600 500 11 1 1 /2 x 3 2500#RF 300#RF - - - - 4230 1860 740 500 12 1 x 2 150#RF 150#RF 275 275 - - - - 275 230 13 1 x 2 300#RF 150#RF 720 720 - - - - 275 230 14 1 x 2 600#RF 150#RF 1440 1440 - - - - 275 230 15 1 1 CF8M /2 x 2 900#RF 300#RF 2160 2160 - - - - 600 500 16 1 1 /2 x 2 1500#RF 300#RF 3600 3600 - - - - 600 500 17 1 1 /2 x 3 2500#RF 300#RF 4000 6000 - - - - 720 500 RF=Raised Face Minimum set pressure limits for metal seat trim Conventional 7 psig Bellows - Gas 22 psig Bellows - Liquid 59 psig* Conventional 2 psig (Inverted) *For liquid bellows valves below this pressure refer facry Note: Soft seated valves require a minimum set pressure of 15 psig. High Pressure Version There is no requirement have an high pressure version for this orifice. 20

VALVE SELECTION GUIDE E 0.196 in 2 127 mm 2 TEMPERATURE LIMITS API 526 538 1000 427 800 232 450-29 -20-59 -75-268 -450 SPRING BODY STAINLESS STEEL CARBON STEEL TUNGSTEN SS - CF8M CARBON STEEL - WCB CS - WC6 SET PRESSURE - PSIG 0 7 8 9 10 11 1 2 3 4 5 6 12 13 14 15 16 17 1000 538 500 900 450 800 400 700 350 600 300 500 250 400 200 300 150 100 200 50 100 0 0-50 -100-100 -200-150 -300-200 -400-250 -450-268 100 200 300 400 500 1000 2000 3000 4000 5000 6000 SET PRESSURE - BAR G. 0 10 20 30 34.5 50 69 100 200 300 413.8 ORIFICE E (All dimensions in inches) Size Rating A B C* D E F G H Wt (ins) lbs (kg) 1 x 2 150 x 150 4.125 1.437 13.875 4.500 0.582 2 3/8 3/4 40 (18) 300 x 150 4.125 1.437 13.875 4.500 0.582 2 3/8 3/4 40 (18) 600 x 150 4.125 1.437 13.875 4.500 0.582 2 3/8 3/4 42 (19) 1 1 /2 x 2 900 x 300 4.125 1.750 25.000 5.500 0.625 5 3/8 3/4 90 (41) 1500 x 300 4.125 1.750 25.000 5.500 0.625 5 3/8 3/4 97 (44) 1 1 /2 x 3 2500 x 300 5.500 2.375 26.875 6.500 0.625 5 3/8 3/4 115 (52) * If a gag is fitted, add 0.5 ins. If a bellows is fitted in the 1 x 2 inch valve add 1.125 inch. If a lever is fitted, add a maximum of 3.5 inch. (Only if flange rating is 600# or less.) For certified height (c), consult facry. Vent hole H on bellows valves only. 21

VALVE SELECTION TABLE E 0.196 in 2 127 mm 2 Flanges ANSI Key Valve size No. inlet x outlet Inlet Outlet Body (ins) Mat l -76 F -450 F -60 C -268 C Max. Set Pressure (psig) and Temperature Limits -21 F -75 F -30 C -59 C 100 F -20 F 38 C -29 C 450 F 800 F 1000 F 232 C 427 C 538 C Max. Back Pressure (psig) Conventional Valve Balanced Bellows Valve 1 1 x 2 150#RF 150#RF - - 285 185 80-285 230 2 1 x 2 300#RF 150#RF - - 740 615 410-285 230 3 1 x 2 600#RF 150#RF - - 1480 1235 825-285 230 WCB 4 1 1 /2 x 2 900#RF 300#RF - - 2220 1845 1235-600 500 5 1 1 /2 x 2 1500#RF 300#RF - - 3705 3080 2060-600 500 6 1 1 /2 x 3 2500#RF 300#RF - - 6000 5135 3430-740 500 7 1 x 2 300#RF 150#RF - - - - 510 225 285 230 8 1 x 2 600#RF 150#RF - - - - 1015 445 285 230 9 1 1 /2 x 2 900#RF 300#RF WC6 - - - - 1525 670 600 500 10 1 1 /2 x 2 1500#RF 300#RF - - - - 2540 1115 600 500 11 1 1 /2 x 3 2500#RF 300#RF - - - - 4230 1860 740 500 12 1 x 2 150#RF 150#RF 275 275 - - - - 275 230 13 1 x 2 300#RF 150#RF 720 720 - - - - 275 230 14 1 x 2 600#RF 150#RF 1440 1440 - - - - 275 230 15 1 1 CF8M /2 x 2 900#RF 300#RF 2160 2160 - - - - 600 500 16 1 1 /2 x 2 1500#RF 300#RF 3600 3600 - - - - 600 500 17 1 1 /2 x 3 2500#RF 300#RF 4000 6000 - - - - 720 500 RF=Raised Face Minimum set pressure limits for metal seat trim Conventional 7 psig Bellows - Gas 22 psig Bellows - Liquid 59 psig* Conventional 2 psig (Inverted) *For liquid bellows valves below this pressure refer facry Note: Soft seated valves require a minimum set pressure of 15 psig. High Pressure Version There is no requirement have an high pressure version for this orifice. 22

VALVE SELECTION GUIDE F 0.307 in 2 198 mm 2 TEMPERATURE LIMITS API 526 538 1000 427 800 232 450-29 -20-59 -75-268 -450 SPRING BODY CS - WC6 STAINLESS STEEL CARBON STEEL TUNGSTEN SS - CF8M CARBON STEEL - WCB SET PRESSURE - PSIG 0 7 8 9 10 11 1 2 3 4 5 6 16 17 12 13 14 15 17 1000 538 500 900 450 800 400 700 350 600 300 500 250 400 200 300 150 100 200 50 100 0 0-50 -100-100 -200-150 -300-200 -400-250 -450-268 100 200 300 400 500 600 700 1000 3000 5000 SET PRESSURE - BAR G. 0 10 20 30 40 48.3 69 200 344.8 ORIFICE F (All dimensions in inches) Size Rating A B C* D E F G H Wt (ins) lbs (kg) 1 1 /2 x 2 150 x 150 4.875 1.625 14.625 4.750 0.750 2 3/8 3/4 46 (21) 300 x 150 4.875 1.625 14.625 6.000 0.750 2 3/8 3/4 46 (21) 600 x 150 4.875 1.625 14.625 6.000 0.750 2 3/8 3/4 46 (21) 1 1 /2 x 3 900 x 300 4.875 1.750 26.750 6.500 0.500 5 3/8 3/4 101 (46) 1500 x 300 4.875 1.750 26.750 6.500 0.500 5 3/8 3/4 101 (46) 2500 x 300 5.500 2.375 26.875 6.500 0.625 5 3/8 3/4 117 (53) * If a gag is fitted, add 0.5 ins. If a lever is fitted, add a maximum of 3.5 inch. (Only if flange rating is 600# or less.) For certified height (c), consult facry. Vent hole H on bellows valves only. 23

VALVE SELECTION TABLE F 0.307 in 2 198 mm 2 Flanges ANSI Key Valve size No. inlet x outlet Inlet Outlet Body (ins) Mat l -76 F -450 F -60 C -268 C Max. Set Pressure (psig) and Temperature Limits -21 F -75 F -30 C -59 C 100 F -20 F 38 C -29 C 450 F 800 F 1000 F 232 C 427 C 538 C Max. Back Pressure (psig) Conventional Valve Balanced Bellows Valve 1 1 1 /2 x 2 150#RF 150#RF - - 285 185 80-285 230 2 1 1 /2 x 2 300#RF 150#RF - - 740 615 410-285 230 3 1 1 /2 x 2 600#RF 150#RF - - 1480 1235 825-285 230 WCB 4 1 1 /2 x 3 900#RF 300#RF - - 2220 1845 1235-740 500 5 1 1 /2 x 3 1500#RF 300#RF - - 3705 3080 2060-740 500 6 1 1 /2 x 3 2500#RF 300#RF - - 5000 5000 3430-740 500 7 1 1 /2 x 2 300#RF 150#RF - - - - 510 225 285 230 8 1 1 /2 x 2 600#RF 150#RF - - - - 1015 445 285 230 9 1 1 /2 x 3 900#RF 300#RF WC6 - - - - 1525 670 740 500 10 1 1 /2 x 3 1500#RF 300#RF - - - - 2540 1115 740 500 11 1 1 /2 x 3 2500#RF 300#RF - - - - 4230 1860 740 500 12 1 1 /2 x 2 150#RF 150#RF 275 275 - - - - 275 230 13 1 1 /2 x 2 300#RF 150#RF 720 720 - - - - 275 230 14 1 1 /2 x 2 600#RF 150#RF 1440 1440 - - - - 275 230 15 1 1 /2 x 3 900#RF 300#RF CF8M 2160 2160 - - - - 720 500 16 1 1 /2 x 3 1500#RF 300#RF 2200 3600 - - - - 720 500 17 1 1 /2 x 3 2500#RF 300#RF 3400 5000 - - - - 720 500 RF=Raised Face Minimum set pressure limits for metal seat trim Conventional 7 psig Bellows - Gas 22 psig Bellows - Liquid 59 psig* Conventional 2 psig (Inverted) *For liquid bellows valves below this pressure refer facry Note: Soft seated valves require a minimum set pressure of 15 psig. High Pressure Version There is no requirement have an high pressure version for this orifice. 24

VALVE SELECTION GUIDE G 0.503 in 2 325 mm 2 TEMPERATURE LIMITS API 526 538 1000 427 800 232 450-29 -20-59 -75-268 -450 SPRING BODY CS - WC6 STAINLESS STEEL CARBON STEEL TUNGSTEN SS - CF8M CARBON STEEL - WCB SET PRESSURE - PSIG 0 7 8 9 10 11 6 1 2 3 4 5 15 16 + 17 12 13 14 16 17 1000 538 500 900 450 800 400 700 350 600 300 500 250 400 200 300 150 100 200 50 100 0 0-50 -100-100 -200-150 -300-200 -400-250 -450-268 100 200 300 500 1000 2000 3000 4000 SET PRESSURE - BAR G. 0 10 20 50 69 100 150 200 275.9 ORIFICE G (All dimensions in inches) Size Rating A B C* D E F G H Wt (ins) lbs (kg) 1 1 /2 x 3 150 x 150 4.875 1.312 18.750 4.750 0.500 2 3/8 3/4 60 (27) 300 x 150 4.875 1.312 18.750 6.000 0.500 2 3/8 3/4 64 (29) 600 x 150 4.875 1.437 18.750 6.000 0.500 2 3/8 3/4 66 (30) 900 x 300 4.875 1.750 27.500 6.500 0.500 5 3/8 3/4 119 (54) 2 x 3 1500 x 300 6.125 2.125 32.000 6.750 0.500 5 1/2 3/4 126 (57) 2500 x 300 6.125 2.812 32.000 6.750 0.687 2 1/2 3/4 139 (63) * If a gag is fitted, add 0.5 ins. If a lever is fitted, add a maximum of 3.5 inch. (Only if flange rating is 600# or less.) For certified height (c), consult facry. Vent hole H on bellows valves only. 25

VALVE SELECTION TABLE G 0.503 in 2 325 mm 2 Flanges ANSI Key Valve size No. inlet x outlet Inlet Outlet Body (ins) Mat l -76 F -450 F -60 C -268 C Max. Set Pressure (psig) and Temperature Limits -21 F -75 F -30 C -59 C 100 F -20 F 38 C -29 C 450 F 800 F 1000 F 232 C 427 C 538 C Max. Back Pressure (psig) Conventional Valve Balanced Bellows Valve 1 1 1 /2 x 3 150#RF 150#RF - - 285 185 80-285 230 2 1 1 /2 x 3 300#RF 150#RF - - 740 615 410-285 230 3 1 1 /2 x 3 600#RF 150#RF - - 1480 1235 825-285 230 WCB 4 1 1 /2 x 3 900#RF 300#RF - - 2220 1845 1235-740 470 5 2 x 3 1500#RF 300#RF - - 3705 3080 2060-740 470 6 2 x 3 2500#RF 300#RF - - 3705 3705 3430-740 470 7 1 1 /2 x 3 300#RF 150#RF - - - - 510 225 285 230 8 1 1 /2 x 3 600#RF 150#RF - - - - 1015 445 285 230 9 1 1 /2 x 3 900#RF 300#RF WC6 - - - - 1525 670 740 470 10 2 x 3 1500#RF 300#RF - - - - 2540 1115 740 470 11 2 x 3 2500#RF 300#RF - - - - 3705 1860 740 470 12 1 1 /2 x 3 150#RF 150#RF 275 275 - - - - 275 230 13 1 1 /2 x 3 300#RF 150#RF 720 720 - - - - 275 230 14 1 1 /2 x 3 600#RF 150#RF 1440 1440 - - - - 275 230 15 1 1 /2 x 3 900#RF 300#RF CF8M 1600 2160 - - - - 720 470 16 2 x 3 1500#RF 300#RF 2450 3600 - - - - 720 470 17 2 x 3 2500#RF 300#RF 2600 3600 - - - - 720 470 RF=Raised Face Minimum set pressure limits for metal seat trim Conventional 13 psig Bellows - Gas 13 psig Bellows - Liquid 40 psig* Conventional 2 psig (Inverted) *For liquid bellows valves below this pressure refer facry Note: Soft seated valves require a minimum set pressure of 15 psig. High Pressure Version There is no requirement have an high pressure version for this orifice. 26

VALVE SELECTION GUIDE H 0.785 in 2 506 mm 2 TEMPERATURE LIMITS API 526 SPRING BODY 538 1000 427 800 232 450-29 -20-59 -75-268 -450 STAINLESS STEEL CARBON STEEL TUNGSTEN SS - CF8M CARBON STEEL - WCB CS - WC6 SET PRESSURE - PSIG 0 7 8 9 10 2 1 3 4 5 6 11 + 12 13 14 15 16 1000 538 500 900 450 800 400 700 350 600 300 500 250 400 200 300 150 100 200 50 100 0 0-50 -100-100 -200-150 -300-200 -400-250 -450-268 100 200 300 400 500 1000 2000 3000 SET PRESSURE - BAR G. 0 10 20 30 34.5 50 69 100 150 206.9 ORIFICE H (All dimensions in inches) Size Rating A B C* D E F G H Wt (ins) lbs (kg) 1 1 /2 x 3 150 x 150 5.125 1.375 18.750 4.875 0.500 2 3/8 3/4 60 (27) 300 x 150 5.125 1.375 18.750 4.875 0.500 2 3/8 3/4 60 (27) 2 x 3 300 x 150 5.125 1.375 19.000 4.875 0.500 2 3/8 3/4 64 (29) 600 x 150 6.062 1.687 20.000 6.375 0.687 2 3/8 3/4 86 (39) 900 x 150 6.062 2.312 31.750 6.375 0.687 5 1/2 3/4 176 (80) 1500 x 300 6.062 2.375 32.000 6.375 0.750 5 1/2 3/4 187 (85) * If a gag is fitted, add 0.5 ins. If a lever is fitted, add a maximum of 3.5 inch. (Only if flange rating is 600# or less.) For certified height (c), consult facry. Vent hole H on bellows valves only. 27

VALVE SELECTION TABLE H 0.785 in 2 506 mm 2 Flanges ANSI Key Valve size No. inlet x outlet Inlet Outlet Body (ins) Mat l -76 F -450 F -60 C -268 C Max. Set Pressure (psig) and Temperature Limits -21 F -75 F -30 C -59 C 100 F -20 F 38 C -29 C 450 F 800 F 1000 F 232 C 427 C 538 C Max. Back Pressure (psig) Conventional Valve Balanced Bellows Valve 1 1 1 /2 x 3 150#RF 150#RF - - 285 185 80-285 230 2 1 1 /2 x 3 300#RF 150#RF - - 285 285 285-285 230 3 2 x 3 300#RF 150#RF WCB - - 740 615 410-285 230 4 2 x 3 600#RF 150#RF - - 1480 1235 825-285 230 5 2 x 3 900#RF 150#RF - - 2220 1845 1235-285 230 6 2 x 3 1500#RF 300#RF - - 2750 2750 2060-740 415 7 2 x 3 300#RF 150#RF - - - - 510 225 285 230 8 2 x 3 600#RF 150#RF - - - - 815 445 285 230 9 2 x 3 900#RF 150#RF WC6 - - - - 1225 670 285 230 10 2 x 3 1500#RF 300#RF - - - - 2040 1115 740 415 11 1 1 /2 x 3 150#RF 150#RF 275 275 - - - - 275 230 12 1 1 /2 x 3 300#RF 150#RF 275 275 - - - - 275 230 13 2 x 3 300#RF 150#RF 720 720 - - - - 275 230 14 2 x 3 600#RF 150#RF CF8M 1440 1440 - - - - 275 230 15 2 x 3 900#RF 150#RF 1485 2160 - - - - 275 230 16 2 x 3 1500#RF 300#RF 1600 2750 - - - - 720 415 RF=Raised Face Minimum set pressure limits for metal seat trim Conventional 7 psig Bellows - Gas 13 psig Bellows - Liquid 28 psig* Conventional 2 psig (Inverted) *For liquid bellows valves below this pressure refer facry Note: Soft seated valves require a minimum set pressure of 15 psig. High Pressure Version. Certain spring materials cannot be used in the low pressure version of the valve, up the maximum pressure. If the required set pressure with your choice of spring material is in excess of the figure shown in the table either choose another material or add H the valve accessories select an high pressure valve. Inlet Max. Set Spring Material (pressures in Psig) Orifice rating Pressure Psig Carbon st. 316 SS Tungsten 17/4PH 17/4PH NACE Inconel X750 1.5H 150# 285 n/a n/a n/a n/a n/a n/a 1.5H 300# 285 n/a n/a n/a n/a n/a n/a 2H 300# 740 n/a n/a n/a n/a n/a n/a 2H 600# 1480 n/a 1000 n/a n/a 1000 n/a 28

VALVE SELECTION GUIDE 1.287 in 2 J 830 mm 2 TEMPERATURE LIMITS API 526 538 1000 427 800 232 450-29 -20-59 -75-268 -450 SPRING BODY STAINLESS STEEL CARBON STEEL TUNGSTEN SS - CF8M CARBON STEEL - WCB SET PRESSURE - PSIG CS - WC6 0 1 7 2 100 200 300 400 500 8 9 11 + 12 13 14 15 +16 10 3 4 5 6 1000 900 800 700 600 500 400 300 538 500 450 400 350 300 250 200 150 200 100 100 50 0 0 14 15 16-50 -100-100 -200-150 -300-200 -400-250 -450-268 1000 2000 3000 SET PRESSURE - BAR G. 0 10 20 30 34.5 50 69 100 150 206.9 ORIFICE J (All dimensions in inches) Size Rating A B C* D E F G H Wt (ins) lbs (kg) 2 x 3 150 x 150 5.375 1.625 19.250 4.875 0.750 2 3/8 3/4 64 (29) 300 x 150 5.375 1.625 19.250 4.875 0.750 2 3/8 3/4 64 (29) 3 x 4 300 x 150 7.250 2.125 21.750 7.125 0.750 2 3/8 3/4 82 (37) 600 x 150 7.250 2.125 23.000 7.125 0.750 2 3/8 3/4 99 (45) 900 x 150 7.250 2.375 33.875 7.125 0.750 5 1/2 3/4 231 (105) 1500 x 300 7.250 2.750 33.875 7.125 0.750 5 1/2 3/4 253 (115) * If a gag is fitted, add 0.5 ins. If a lever is fitted, add a maximum of 3.5 inch. (Only if flange rating is 600# or less.) For certified height (c), consult facry. Vent hole H on bellows valves only. 29

VALVE SELECTION TABLE 1.287 in 2 J 830 mm 2 Flanges ANSI Key Valve size No. inlet x outlet Inlet Outlet Body (ins) Mat l -76 F -450 F -60 C -268 C Max. Set Pressure (psig) and Temperature Limits -21 F -75 F -30 C -59 C 100 F -20 F 38 C -29 C 450 F 800 F 1000 F 232 C 427 C 538 C Max. Back Pressure (psig) Conventional Valve Balanced Bellows Valve 1 2 x 3 150#RF 150#RF - - 285 185 80-285 230 2 2 x 3 300#RF 150#RF - - 285 285 285-285 230 3 3 x 4 300#RF 150#RF WCB - - 740 615 410-285 230 4 3 x 4 600#RF 150#RF - - 1480 1235 825-285 230 5 3 x 4 900#RF 150#RF - - 2220 1845 1235-285 230 6 3 x 4 1500#RF 300#RF - - 2700 2700 2060-600 230 7 3 x 4 300#RF 150#RF - - - - 510 225 285 230 8 3 x 4 600#RF 150#RF WC6 - - - - 815 445 285 230 9 3 x 4 900#RF 150#RF - - - - 1225 670 285 230 10 3 x 4 1500#RF 300#RF - - - - 2040 1115 600 230 11 2 x 3 150#RF 150#RF 275 275 - - - - 275 230 12 2 x 3 300#RF 150#RF 275 275 - - - - 275 230 13 3 x 4 300#RF 150#RF 500 720 - - - - 275 230 CF8M 14 3 x 4 600#RF 150#RF 625 1440 - - - - 275 230 15 3 x 4 900#RF 150#RF 800 2160 - - - - 275 230 16 3 x 4 1500#RF 300#RF 800 2700 - - - - 600 230 RF=Raised Face Minimum set pressure limits for metal seat trim Conventional 5 psig Bellows - Gas 13 psig Bellows - Liquid 34 psig* Conventional 1.5 psig (Inverted) *For liquid bellows valves below this pressure refer facry Note: Soft seated valves require a minimum set pressure of 15 psig. High Pressure Version. Certain spring materials cannot be used in the low pressure version of the valve, up the maximum pressure. If the required set pressure with your choice of spring material is in excess of the figure shown in the table either choose another material or add H the valve accessories select an high pressure valve. Inlet Max. Set Spring Material (pressures in Psig) Orifice rating Pressure Psig Carbon st. 316 SS Tungsten 17/4PH 17/4PH NACE Inconel X750 2J 150# 285 n/a n/a n/a n/a n/a n/a 2J 300# 285 n/a n/a n/a n/a n/a n/a 3J 300# 740 n/a 500 n/a n/a 430 n/a 3J 600# 1480 n/a 900 n/a 900 870 900 30

VALVE SELECTION GUIDE K 1.838 in 2 1185 mm 2 TEMPERATURE LIMITS API 526 538 1000 427 800 232 450-29 -20-59 -75-268 -450 SPRING BODY INCONEL CS - WC6 STAINLESS STEEL CARBON STEEL TUNGSTEN SS - CF8M CARBON STEEL - WCB SET PRESSURE - PSIG 0 1 6 10 11 7 8 12 + 13 14 100 200 300 400 500 600 700 9 2 3 4 1000 900 800 700 600 500 400 300 538 500 450 400 350 300 250 200 150 200 100 100 50 0 0 14-50 -100-100 -200-300 -150-200 -400-250 -450-268 1000 2000 3000 12 13 5 SET PRESSURE - BAR G. 0 10 20 30 40 48.3 69 100 150 206.9 ORIFICE K (All dimensions in inches) Size Rating A B C* D E F G H Wt (ins) lbs (kg) 3 x 4 150 x 150 6.125 2.000 21.750 6.375 0.875 3 3/8 3/4 108 (49) 300 x 150 6.125 2.000 21.750 6.375 0.875 3 3/8 3/4 108 (49) 600 x 150 7.250 2.125 23.500 7.125 0.875 3 3/8 3/4 141 (64) 3 x 6 900 x 150 7.812 2.562 40.000 8.500 0.937 5 3/4 3/4 339 (154) 1500 x 300 7.750 2.875 40.000 8.500 0.875 5 3/4 3/4 353 (160) * If a gag is fitted, add 0.5 ins. If a lever is fitted, add a maximum of 3.5 inch. (Only if flange rating is 600# or less.) For certified height (c), consult facry. Vent hole H on bellows valves only. 31

VALVE SELECTION TABLE K 1.838 in 2 1185 mm 2 Flanges ANSI Key Valve size No. inlet x outlet Inlet Outlet Body (ins) Mat l -76 F -450 F -60 C -268 C Max. Set Pressure (psig) and Temperature Limits -21 F -75 F -30 C -59 C 100 F -20 F 38 C -29 C 450 F 800 F 1000 F 232 C 427 C 538 C Max. Back Pressure (psig) Conventional Valve Balanced Bellows Valve 1 3 x 4 150#RF 150#RF - - 285 185 80-285 150 2 3 x 4 300#RF 150#RF - - 740 615 410-285 150 3 3 x 4 600#RF 150#RF WCB - - 1480 1235 825-285 200 4 3 x 6 900#RF 150#RF - - 2220 1845 1235-285 200 5 3 x 6 1500#RF 300#RF - - 2220 2220 2060-600 200 6 3 x 4 300#RF 150#RF - - - - 510 215 285 150 7 3 x 4 600#RF 150#RF - - - - 815 445 285 200 WC6 8 3 x 6 900#RF 150#RF - - - - 1225 670 285 200 9 3 x 6 1500#RF 300#RF - - - - 2040 1115 600 200 10 3 x 4 150#RF 150#RF 275 275 - - - - 275 150 11 3 x 4 300#RF 150#RF 525 720 - - - - 275 150 12 3 x 4 600#RF 150#RF CF8M 600 1440 - - - - 275 200 13 3 x 6 900#RF 150#RF 600 2160 - - - - 275 200 14 3 x 6 1500#RF 300#RF 750 2220 - - - - 600 200 RF=Raised Face Minimum set pressure limits for metal seat trim Conventional 5 psig Bellows - Gas 13 psig Bellows - Liquid 26 psig* Conventional 1.5 psig (Inverted) *For liquid bellows valves below this pressure refer facry Note: Soft seated valves require a minimum set pressure of 15 psig. High Pressure Version. Certain spring materials can not be used in the low pressure version of the valve, up the maximum pressure. If the required set pressure with your choice of spring material is in excess of the figure shown in the table either choose another material or add H the valve accessories select an high pressure valve. Inlet Max. Set Spring Material (pressures in Psig) Orifice rating Pressure Psig Carbon st. 316 SS Tungsten 17/4PH 17/4PH NACE Inconel X750 K 150# 285 n/a n/a n/a n/a n/a n/a K 300# 740 n/a 450 n/a n/a 600 n/a K 600# 1480 n/a 750 n/a n/a 570 1070 32

VALVE SELECTION GUIDE L 2.853 in 2 1840 mm 2 TEMPERATURE LIMITS API 526 538 1000 427 800 232 450-29 -20-59 -75-268 -450 SPRING BODY CS - WC6 STAINLESS STEEL CARBON STEEL TUNGSTEN SS - CF8M CARBON STEEL - WCB SET PRESSURE - PSIG 0 10 7 8 9 6 2 1 3 4 5 13 14 15 11 + 12 13 + 14 15 1000 538 500 900 450 800 400 700 350 600 300 500 250 400 200 300 150 100 200 50 100 0 0-50 -100-100 -200-150 -300-200 -400-250 -450-268 200 400 600 800 1000 1500 SET PRESSURE - BAR G. 0 10 20 30 40 50 60 69 103.5 ORIFICE L (All dimensions in inches) Size Rating A B C* D E F G H Wt (ins) lbs (kg) 3 x 4 150 x 150 6.125 2.000 21.750 6.500 0.875 4 3/8 3/4 108 (49) 300 x 150 6.125 2.000 21.750 6.500 0.875 4 3/8 3/4 108 (49) 4 x 6 300 x 150 7.062 2.062 27.000 7.125 0.812 5 1/2 1 234 (106) 600 x 150 7.062 2.312 28.250 8.000 0.812 5 1/2 1 249 (113) 900 x 150 7.750 2.687 41.875 8.750 0.750 5 1/2 1 353 (160) 1500 x 150 7.750 2.937 44.000 8.750 0.812 5 1/2 1 361 (164) * If a gag is fitted, add 0.5 ins. If a lever is fitted, add a maximum of 3.5 inch. (Only if flange rating is 600# or less.) For certified height (c), consult facry. Vent hole H on bellows valves only. 33

VALVE SELECTION TABLE L 2.853 in 2 1840 mm 2 Flanges ANSI Key Valve size No. inlet x outlet Inlet Outlet Body (ins) Mat l -76 F -450 F -60 C -268 C Max. Set Pressure (psig) and Temperature Limits -21 F -75 F -30 C -59 C 100 F -20 F 38 C -29 C 450 F 800 F 1000 F 232 C 427 C 538 C Max. Back Pressure (psig) Conventional Valve Balanced Bellows Valve 1 3 x 4 150#RF 150#RF - - 285 185 80-285 100 2 3 x 4 300#RF 150#RF - - 285 285 285-285 100 3 4 x 6 300#RF 150#RF WCB - - 740 615 410-285 170 4 4 x 6 600#RF 150#RF - - 1000 1000 825-285 170 5 4 x 6 900#RF 150#RF - - 1500 1500 1235-285 170 6 4 x 6 1500#RF 150#RF - - 1500 1500 1500-285 170 7 4 x 6 300#RF 150#RF - - - - 510 225 285 170 8 4 x 6 600#RF 150#RF WC6 - - - - 1000 445 285 170 9 4 x 6 900#RF 150#RF - - - - 1500 670 285 170 10 4 x 6 1500#RF 150#RF - - - - 1500 1115 285 170 11 3 x 4 150#RF 150#RF 275 275 - - - - 275 100 12 3 x 4 300#RF 150#RF 275 275 - - - - 275 100 13 4 x 6 300#RF 150#RF CF8M 535 720 - - - - 275 170 14 4 x 6 600#RF 150#RF 535 1000 - - - - 275 170 15 4 x 6 900#RF 150#RF 700 1500 - - - - 275 170 RF=Raised Face Minimum set pressure limits for metal seat trim Conventional 5 psig Bellows - Gas 13 psig Bellows - Liquid 23 psig* Conventional 1.5 psig (Inverted) *For liquid bellows valves below this pressure refer facry Note: Soft seated valves require a minimum set pressure of 15 psig. High Pressure Version. Certain spring materials cannot be used in the low pressure version of the valve, up the maximum pressure. If the required set pressure with your choice of spring material is in excess of the figure shown in the table either choose another material or add H the valve accessories select an high pressure valve. Inlet Max. Set Spring Material (pressures in Psig) Orifice rating Pressure Psig Carbon st. 316 SS Tungsten 17/4PH 17/4PH NACE Inconel X750 3L 150# 285 n/a n/a n/a n/a 255 n/a 3L 300# 285 n/a n/a n/a n/a 255 n/a 4L 300# 740 n/a n/a n/a n/a n/a n/a 4L 600# 1000 n/a 850 n/a n/a 825 n/a 34

VALVE SELECTION GUIDE M 3.60 in 2 2320 mm 2 TEMPERATURE LIMITS API 526 538 1000 427 800 232 450-29 -20-59 -75-268 -450 SPRING BODY INCONEL CS - WC6 STAINLESS STEEL CARBON STEEL TUNGSTEN SS - CF8M CARBON STEEL - WCB SET PRESSURE - PSIG 0 1 5 8 9 10 6 7 2 3 200 400 600 800 10 4 1000 900 800 700 600 500 400 300 538 500 450 400 350 300 250 200 150 100 200 50 100 0 0-50 -100-100 -200-150 -300-200 -400-250 -450-268 1000 1500 SET PRESSURE - BAR G. 0 10 20 30 40 50 60 69 103.5 ORIFICE M (All dimensions in inches) Size Rating A B C* D E F G H Wt (ins) lbs (kg) 4 x 6 150 x 150 7.000 2.000 26.500 7.250 0.750 5 1/2 1 234 (106) 300 x 150 7.000 2.000 26.500 7.250 0.750 5 1/2 1 234 (106) 600 x 150 7.000 2.250 28.250 8.000 0.750 5 1/2 1 249 (113) 900 x 150 7.750 2.500 41.875 8.750 0.750 5 1/2 1 377 (171) * If a gag is fitted, add 0.5 ins. If a lever is fitted, add a maximum of 3.5 inch. (Only if flange rating is 600# or less.) For certified height (c), consult facry. Vent hole H on bellows valves only. 35

VALVE SELECTION TABLE M 3.60 in 2 2320 mm 2 Flanges ANSI Key Valve size No. inlet x outlet Inlet Outlet Body (ins) Mat l -76 F -450 F -60 C -268 C Max. Set Pressure (psig) and Temperature Limits -21 F -75 F -30 C -59 C 100 F -20 F 38 C -29 C 450 F 800 F 1000 F 232 C 427 C 538 C Max. Back Pressure (psig) Conventional Valve Balanced Bellows Valve 1 4 x 6 150#RF 150#RF - - 285 185 80-285 80 2 4 x 6 300#RF 150#RF - - 740 615 410-285 160 WCB 3 4 x 6 600#RF 150#RF - - 1100 1100 825-285 160 4 4 x 6 900#RF 150#RF - - 1100 1100 1100-285 160 5 4 x 6 300#RF 150#RF - - - - 510 225 285 160 6 4 x 6 600#RF 150#RF WC6 - - - - 1015 445 285 160 7 4 x 6 900#RF 150#RF - - - - 1100 670 285 160 8 4 x 6 150#RF 150#RF 275 275 - - - - 275 80 9 4 x 6 300#RF 150#RF CF8M 525 720 - - - - 275 160 10 4 x 6 600#RF 150#RF 600 1000 - - - - 275 160 RF=Raised Face Minimum set pressure limits for metal seat trim Conventional 4 psig Bellows - Gas 13 psig Bellows - Liquid 27 psig* Conventional 1.5 psig (Inverted) *For liquid bellows valves below this pressure refer facry Note: Soft seated valves require a minimum set pressure of 15 psig. High Pressure Version. Certain spring materials can not be used in the low pressure version of the valve, up the maximum pressure. If the required set pressure with your choice of spring material is in excess of the figure shown in the table either choose another material or add H the valve accessories select an high pressure valve. Inlet Max. Set Spring Material (pressures in Psig) Orifice rating Pressure Psig Carbon st. 316 SS Tungsten 17/4PH 17/4PH NACE Inconel X750 M 150# 285 n/a n/a n/a n/a n/a n/a M 300# 740 n/a 500 n/a n/a 590 n/a M 600# 1100 n/a 825 n/a 1000 900 1000 36

VALVE SELECTION GUIDE N 4.34 ins 2 2800 mm 2 TEMPERATURE LIMITS API 526 538 1000 427 800 232 450-29 -20-59 -75-268 -450 SPRING BODY STAINLESS STEEL CARBON STEEL TUNGSTEN SS - CF8M CARBON STEEL - WCB SET PRESSURE - PSIG CS - WC6 0 1 5 8 9 10 6 7 2 3 200 400 600 800 10 4 1000 900 800 700 600 500 400 300 538 500 450 400 350 300 250 200 150 100 200 50 100 0 0-50 -100-100 -200-150 -300-200 -400-250 -450-268 1000 SET PRESSURE - BAR G. 0 10 20 30 40 50 60 69 ORIFICE N (All dimensions in inches) Size Rating A B C* D E F G H Wt (ins) lbs (kg) 4 x 6 150 x 150 7.750 2.000 29.250 8.250 0.750 5 1/2 1 242 (110) 300 x 150 7.750 2.000 29.250 8.250 0.750 5 1/2 1 242 (110) 600 x 150 7.750 2.250 34.250 8.750 0.750 5 1/2 1 258 (117) 900 x 150 7.750 2.500 41.500 8.750 0.750 5 1/2 1 395 (179) * If a gag is fitted, add 0.5 ins. If a lever is fitted, add a maximum of 3.5 inch. (Only if flange rating is 600# or less.) For certified height (c), consult facry. Vent hole H on bellows valves only. 37

VALVE SELECTION TABLE N 4.34 ins 2 2800 mm 2 Flanges ANSI Key Valve size No. inlet x outlet Inlet Outlet Body (ins) Mat l -76 F -450 F -60 C -268 C Max. Set Pressure (psig) and Temperature Limits -21 F -75 F -30 C -59 C 100 F -20 F 38 C -29 C 450 F 800 F 1000 F 232 C 427 C 538 C Max. Back Pressure (psig) Conventional Valve Balanced Bellows Valve 1 4 x 6 150#RF 150#RF - - 285 185 80-285 80 2 4 x 6 300#RF 150#RF - - 740 615 410-285 160 WCB 3 4 x 6 600#RF 150#RF - - 1000 1000 825-285 160 4 4 x 6 900#RF 150#RF - - 1000 1000 1000-285 160 5 4 x 6 300#RF 150#RF - - - - 510 225 285 160 6 4 x 6 600#RF 150#RF WC6 - - - - 1000 445 285 160 7 4 x 6 900#RF 150#RF - - - - 1000 670 285 160 8 4 x 6 150#RF 150#RF 275 275 - - - - 275 80 9 4 x 6 300#RF 150#RF CF8M 450 720 - - - - 275 160 10 4 x 6 600#RF 150#RF 500 1000 - - - - 275 160 RF=Raised Face Minimum set pressure limits for metal seat trim Conventional 5 psig Bellows - Gas 13 psig Bellows - Liquid 29 psig* Conventional 1.5 psig (Inverted) *For liquid bellows valves below this pressure refer facry Note: Soft seated valves require a minimum set pressure of 15 psig. High Pressure Version. Certain spring materials can not be used in the low pressure version of the valve, up the maximum pressure. If the required set pressure with your choice of spring material is in excess of the figure shown in the table either choose another material or add H the valve accessories select an high pressure valve. Inlet Max. Set Spring Material (pressures in Psig) Orifice rating Pressure Psig Carbon st. 316 SS Tungsten 17/4PH 17/4PH NACE Inconel X750 N 150# 285 n/a n/a n/a n/a n/a n/a N 300# 740 n/a 680 n/a n/a 700 n/a N 600# 1000 n/a n/a n/a n/a n/a n/a 38

VALVE SELECTION GUIDE P 6.38 ins 2 4120 mm 2 TEMPERATURE LIMITS API 526 538 1000 427 800 232 450-29 -20-59 -75-268 -450 SPRING BODY INCONEL CS - WC6 STAINLESS STEEL CARBON STEEL TUNGSTEN SS - CF8M CARBON STEEL - WCB SET PRESSURE - PSIG 0 1 5 8 9 10 6 7 2 3 10 200 400 600 800 4 1000 900 800 700 600 500 400 300 538 500 450 400 350 300 250 200 150 100 200 50 100 0 0-50 -100-100 -200-150 -300-200 -400-250 -450-268 1000 SET PRESSURE - BAR G. 0 10 20 30 40 50 60 69 ORIFICE P (All dimensions in inches) Size Rating A B C* D E F G H Wt (ins) lbs (kg) 4 x 6 150 x 150 7.125 2.000 27.750 9.000 0.750 5 1/2 1 254 (115) 300 x 150 8.875 2.000 29.250 10.000 0.750 5 1/2 1 254 (115) 600 x 150 8.875 2.250 35.250 10.000 0.750 5 1/2 1 269 (122) 900 x 150 8.875 2.500 45.000 10.000 0.750 5 1/2 1 412 (187) * If a gag is fitted, add 0.5 ins. If a lever is fitted, add a maximum of 3.5 inch. (Only if flange rating is 600# or less.) For certified height (c), consult facry. Vent hole H on bellows valves only. 39

VALVE SELECTION TABLE P 6.38 ins 2 4120 mm 2 Flanges ANSI Key Valve size No. inlet x outlet Inlet Outlet Body (ins) Mat l -76 F -450 F -60 C -268 C Max. Set Pressure (psig) and Temperature Limits -21 F -75 F -30 C -59 C 100 F -20 F 38 C -29 C 450 F 800 F 1000 F 232 C 427 C 538 C Max. Back Pressure (psig) Conventional Valve Balanced Bellows Valve 1 4 x 6 150#RF 150#RF - - 285 185 80-285 80 2 4 x 6 300#RF 150#RF - - 525 525 410-285 150 WCB 3 4 x 6 600#RF 150#RF - - 1000 1000 825-285 150 4 4 x 6 900#RF 150#RF - - 1000 1000 1000-285 150 5 4 x 6 300#RF 150#RF - - - - 510 225 285 150 6 4 x 6 600#RF 150#RF WC6 - - - - 1000 445 285 150 7 4 x 6 900#RF 150#RF - - - - 1000 670 285 150 8 4 x 6 150#RF 150#RF 175 275 - - - - 275 80 9 4 x 6 300#RF 150#RF CF8M 300 525 - - - - 275 150 10 4 x 6 600#RF 150#RF 480 1000 - - - - 275 150 RF=Raised Face Minimum set pressure limits for metal seat trim Conventional 4 psig Bellows - Gas 13 psig Bellows - Liquid 24 psig* Conventional 1.5 psig (Inverted) *For liquid bellows valves below this pressure refer facry Note: Soft seated valves require a minimum set pressure of 15 psig. High Pressure Version. Certain spring materials can not be used in the low pressure version of the valve, up the maximum pressure. If the required set pressure with your choice of spring material is in excess of the figure shown in the table either choose another material or add H the valve accessories select an high pressure valve. Inlet Max. Set Spring Material (pressures in Psig) Orifice rating Pressure Psig Carbon st. 316 SS Tungsten 17/4PH 17/4PH NACE Inconel X750 P 150# 285 n/a n/a n/a n/a n/a n/a P 300# 525 n/a 350 n/a n/a 390 460 P 600# 1000 n/a 640 n/a n/a 336 n/a 40

VALVE SELECTION GUIDE Q 11.05 in 2 7130 mm 2 TEMPERATURE LIMITS API 526 538 1000 427 800 232 450-29 -20-59 -75-268 -450 SPRING BODY CS - WC6 STAINLESS STEEL CARBON STEEL TUNGSTEN SS - CF8M CARBON STEEL - WCB SET PRESSURE - PSIG 0 4 5 1 6 7 2 3 8 8 10 50 100 200 300 400 500 1000 538 500 900 450 800 400 700 350 600 300 500 250 400 200 300 150 100 200 50 100 0 0-50 -100-100 -200-150 -300-200 -400-250 -450-268 600 SET PRESSURE - BAR G. 0 0.69 2 4 6 6.9 10 15 20 30 41.4 ORIFICE Q (All dimensions in inches) Size Rating A B C* D E F G H Wt (ins) lbs (kg) 6 x 8 150 x 150 9.437 2.312 31.750 9.500 0.812 3 1/2 1 364 (165) 300 x 150 9.437 2.312 31.750 9.500 0.812 3 1/2 1 364 (165) 600 x 150 9.437 2.750 36.750 9.500 0.812 6 1/2 1 399 (181) * If a gag is fitted, add 0.5 ins. If a lever is fitted, add a maximum of 3.5 inch. (Only if flange rating is 600# or less.) For certified height (c), consult facry. Vent hole H on bellows valves only. 41

VALVE SELECTION TABLE Q 11.05 in 2 7130 mm 2 Flanges ANSI Key Valve size No. inlet x outlet Inlet Outlet Body (ins) Mat l -76 F -450 F -60 C -268 C Max. Set Pressure (psig) and Temperature Limits -21 F -75 F -30 C -59 C 100 F -20 F 38 C -29 C 450 F 800 F 1000 F 232 C 427 C 538 C Max. Back Pressure (psig) Conventional Valve Balanced Bellows Valve 1 6 x 8 150#RF 150#RF - - 165 165 80-115 70 2 6 x 8 300#RF 150#RF WCB - - 300 300 300-115 115 3 6 x 8 600#RF 150#RF - - 600 600 600-115 115 4 6 x 8 300#RF 150#RF WC6 - - - - 165 165 115 115 5 6 x 8 600#RF 150#RF - - - - 600 445 115 115 6 6 x 8 150#RF 150#RF 165 165 - - - - 115 70 7 6 x 8 300#RF 150#RF CF8M 250 300 - - - - 115 115 8 6 x 8 600#RF 150#RF 300 600 - - - - 115 115 RF=Raised Face Minimum set pressure limits for metal seat trim Conventional 4 psig Bellows - Gas 13 psig Bellows - Liquid 23 psig* Conventional 1.5 psig (Inverted) *For liquid bellows valves below this pressure refer facry Note: Soft seated valves require a minimum set pressure of 15 psig. High Pressure Version. Certain spring materials can not be used in the low pressure version of the valve, up the maximum pressure. If the required set pressure with your choice of spring material is in excess of the figure shown in the table either choose another material or add H the valve accessories select an high pressure valve. Inlet Max. Set Spring Material (pressures in Psig) Orifice rating Pressure Psig Carbon st. 316 SS Tungsten 17/4PH 17/4PH NACE Inconel X750 Q 150# 165 n/a 109 n/a n/a 117 n/a Q 300# 300 n/a 109 n/a 165 117 165 Q 600# 600 n/a 109 n/a 400 117 390 42

VALVE SELECTION GUIDE R 16.00 in 2 10300 mm 2 TEMPERATURE LIMITS API 526 538 1000 427 800 232 450-29 -20-59 -75-268 -450 SPRING BODY STAINLESS STEEL CARBON STEEL TUNGSTEN SS - CF8M CARBON STEEL - WCB SET PRESSURE - PSIG CS - WC6 0 7 + 8 5 1 10 20 30 40 50 100 200 9 2 6 3 4 10 10 1000 538 500 900 450 800 400 700 350 600 300 500 250 400 200 300 150 100 200 50 100 0 0-50 -100-100 -200-150 -300-200 -400-250 -450-268 300 SET PRESSURE - BAR G. 0 1 2 3 3.45 5 6.9 10 15 20.7 ORIFICE R (All dimensions in inches) Size Rating A B C* D E F G H Wt (ins) lbs (kg) 6 x 8 150 x 150 9.437 2.312 34.750 9.500 0.812 3 1/2 1 370 (168) 300 x 150 9.437 2.312 34.750 9.500 0.812 3 1/2 1 370 (168) 6 x 10 300 x 150 9.437 2.312 34.750 10.500 0.812 3 1/2 1 465 (211) 600 x 150 9.437 2.750 40.750 10.500 0.812 6 1/2 1 489 (222) * If a gag is fitted, add 0.5 ins. If a lever is fitted, add a maximum of 3.5 inch. (Only if flange rating is 600# or less.) For certified height (c), consult facry. Vent hole H on bellows valves only. 43

VALVE SELECTION TABLE R 16.00 in 2 10300 mm 2 Flanges ANSI Key Valve size No. inlet x outlet Inlet Outlet Body (ins) Mat l -76 F -450 F -60 C -268 C Max. Set Pressure (psig) and Temperature Limits -21 F -75 F -30 C -59 C 100 F -20 F 38 C -29 C 450 F 800 F 1000 F 232 C 427 C 538 C Max. Back Pressure (psig) Conventional Valve Balanced Bellows Valve 1 6 x 8 150#RF 150#RF - - 100 100 80-60 60 2 6 x 8 300#RF 150#RF - - 100 100 100-60 60 WCB 3 6 x 10 300#RF 150#RF - - 230 230 230-100 100 4 6 x 10 600#RF 150#RF - - 300 300 300-100 100 5 6 x 8 300#RF 150#RF - - - - 100 100 60 60 WC6 6 6 x 10 600#RF 150#RF - - - - 300 300 100 100 7 6 x 8 150#RF 150#RF 55 100 - - - - 60 60 8 6 x 8 300#RF 150#RF 55 100 - - - - 60 60 CF8M 9 6 x 10 300#RF 150#RF 150 230 - - - - 100 100 10 6 x 10 600#RF 150#RF 200 300 - - - - 100 100 RF=Raised Face Minimum set pressure limits for metal seat trim Conventional 4 psig Bellows - Gas 13 psig Bellows - Liquid 25 psig* Conventional 1.5 psig (Inverted) *For liquid bellows valves below this pressure refer facry Note: Soft seated valves require a minimum set pressure of 15 psig. High Pressure Version. Certain spring materials can not be used in the low pressure version of the valve, up the maximum pressure. If the required set pressure with your choice of spring material is in excess of the figure shown in the table either choose another material or add H the valve accessories select an high pressure valve. Inlet Max. Set Spring Material (pressures in Psig) Orifice rating Pressure Psig Carbon st. 316 SS Tungsten 17/4PH 17/4PH NACE Inconel X750 6R8 150# 100 n/a 73 n/a n/a 90 n/a 6R8 300# 100 n/a 73 n/a n/a 90 n/a 6R10 300# 230 n/a 73 n/a 224 90 147 6R10 600# 300 n/a 190 n/a n/a 180 n/a 44

VALVE SELECTION GUIDE T 26.00 in 2 16770 mm 2 TEMPERATURE LIMITS API 526 538 1000 427 800 232 450-29 -20-59 -75-268 -450 SPRING BODY STAINLESS STEEL CARBON STEEL TUNGSTEN SS - CF8M CARBON STEEL - WCB SET PRESSURE - PSIG CS - WC6 0 4 1 5 3 10 20 30 40 50 60 70 80 90 100 200 5 2 1000 538 500 900 450 800 400 700 350 600 300 500 250 400 200 300 150 100 200 50 100 0 0-50 -100-100 -200-150 -300-200 -400-250 -450-268 300 SET PRESSURE - BAR G. 0 1 2 3 4 5 6 6.9 20.7 ORIFICE T (All dimensions in inches) Size Rating A B C* D E F G H Wt (ins) lbs (kg) 8 x 10 150 x 150 10.875 2.625 42.250 11.000 1.000 6 1/2 1 661 (300) 300 x 150 10.875 2.625 42.250 11.000 1.000 6 1/2 1 683 (310) * If a gag is fitted, add 0.5 ins. If a lever is fitted, add a maximum of 3.5 inch. (Only if flange rating is 600# or less.) For certified height (c), consult facry. Vent hole H on bellows valves only. 45

VALVE SELECTION TABLE T 26.00 in 2 16770 mm 2 Flanges ANSI Key Valve size No. inlet x outlet Inlet Outlet Body (ins) Mat l -76 F -450 F -60 C -268 C Max. Set Pressure (psig) and Temperature Limits 1 8 x 10 150#RF 150#RF - - 65 65 65-30 30 WCB 2 8 x 10 300#RF 150#RF - - 300 300 300-100 100 3 8 x 10 300#RF 150#RF WC6 - - - - 300 225 100 100 4 8 x 10 150#RF 150#RF 50 65 - - - - 30 30 CF8M 5 8 x 10 300#RF 150#RF 65 120 - - - - 60 60-21 F -75 F -30 C -59 C 100 F -20 F 38 C -29 C 450 F 800 F 1000 F 232 C 427 C 538 C Max. Back Pressure (psig) Conventional Valve Balanced Bellows Valve RF=Raised Face Minimum set pressure limits for metal seat trim Conventional 4 psig Bellows - Gas 13 psig Bellows - Liquid 18 psig* Conventional 1.5 psig (Inverted) *For liquid bellows valves below this pressure refer facry Note: Soft seated valves require a minimum set pressure of 15 psig. High Pressure Version. Certain spring materials can not be used in the low pressure version of the valve, up the maximum pressure. If the required set pressure with your choice of spring material is in excess of the figure shown in the table either choose another material or add H the valve accessories select an high pressure valve. Inlet Max. Set Spring Material (pressures in Psig) Orifice rating Pressure Psig Carbon st. 316 SS Tungsten 17/4PH 17/4PH NACE Inconel X750 T 150# 65 n/a n/a n/a n/a n/a n/a T 300# 300 200 79 200 138 96 83 46

PRESSURE ADJUSTMENT Each valve is facry set and normally would not need any pressure adjustment; however, if the occasion arises, the following procedures apply: ASME If the valve is ASME stamped (UV)(NB), repairs must be carried out by an ASME authorised repair company, i.e. one holding either the (UV) or (VR) stamp. 3 13 12 Test rig It is normally desirable remove the valve from the plant and use a suitable test rig, specifically designed for safety relief valves. Range Each spring has a definite range, the limits of which should not be exceeded. These should be checked with the facry, since if a set pressure change is required, it may be necessary obtain a new spring. Should the set pressure be changed it is important ensure that the valve will still have sufficient capacity under the new service conditions. Procedure 1) Remove the cap (3). This exposes the compression screw (12). 2) Slacken the locknut (13). 3) Introduce pressure the valve inlet. The spring pressure and consequently the valve set pressure may be increased or decreased by turning the compression screw. Clockwise - increases set pressure Anti-clockwise - decreases set pressure Check against a calibrated pressure gauge. 4) Re-tighten the locknut and refit the cap. Replace cap gasket if damaged. 5) Check seat leakage (see page 49/50). COLD DIFFERENTIAL TEST PRESSURE When setting a valve intended for use at high temperature on a test rig using a test fluid at ambient temperatures, it is necessary set the valve at a slightly higher pressure, so that it will open at the correct set pressure under relieving conditions. The necessary allowance is shown in the following table. Relieving Relieving % Increase in set temperature temperature pressure at ambient Centigrade Fahrenheit temperature WB, B + C Series Up 121 C Up 250 F None >121 C 316 C >250 F 600 F 1 >316 C 427 C >600 F 800 F 2 >427 C 538 C >800 F 1000 F 3 D Series Up 100 C Up 212 F None >100 C 150 C >212 F 302 F 2 >150 C 260 C >302 F 500 F 3 47

BLOWDOWN RING SETTING The blowdown adjustment is achieved by means of a single blowdown ring. By reducing the blowdown gap, blowdown is increased. By increasing the blowdown gap, blowdown is decreased. Blowdown is defined as the difference between the set pressure of the valve and the reseating pressure. Important It is important reset the blowdown ring the correct position after maintenance has been carried out on the valve. Method Note: It is dangerous adjust the blowdown ring when the valve is under pressure, unless a suitable test gag is fitted prevent inadvertent valve opening 1) Removing the setting screw in the body permits access the blowdown ring. 2) Close the blowdown gap until the ring is uching the face of the disc (turn the ring from left right). 3) Consult the chart in the maintenance manual determine the correct blowdown ring setting, or consult the facry. 4) Wind back the blowdown ring the right number of notches establish the correct position (count the number of notches or serrations on the outside of the blowdown ring). 5) Relocate the locking pin in the notches provided on the outside diameter of the blowdown ring. 6) Tighten up the setting screw, ensuring that an undamaged gasket is in place. 48

SEAT TIGHTNESS / SEAT LEAKAGE TESTING (in accordance with API 527) Described here are methods of determining the seat tightness of metal and soft-seated pressure relief valves, including those of conventional, bellows and pilot-operated designs. The maximum acceptable leakage rates are defined for pressure relief valves with set pressures from 15 Psig 6,000 Psig. If greater seat tightness is required, the purchaser shall specify it in the purchase order. The test medium for determining the seat tightness - air, steam or water - shall be the same as that used for determining the set pressure of the valve. For dual-service valves, the test medium - air, steam or water - shall be the same as the primary relieving medium. To ensure safety, the procedures outlined shall be performed by persons experienced in the use and functions of pressure relief valves. Test apparatus for air seat tightness Tube 5 16" o.d. x 0.035" wall 1 2" TESTING WITH AIR A1 Test apparatus A test arrangement for determining seat tightness with air is shown opposite. Leakage shall be measured using a tube with an outside diameter of 5/16 inch and a wall thickness of 0.035 inch. The tube end shall be cut square and smooth. The tube opening shall be 1 2 inch below the surface of the water. The tube shall be perpendicular the surface of the water. A2 Test medium The test medium shall be air (or nitrogen) near ambient temperature. A3 Test configuration The valve shall be vertically mounted on the test stand and the test apparatus shall be attached the valve outlet, as shown opposite. All openings - including but not limited caps, drain holes, vents, and outlets shall be closed. A4 Test pressure For a valve whose set pressure is greater than 50 Psig, the leakage rate (in bubbles per minute) shall be determined with the test pressure at the valve inlet held at 90% of the set pressure. For a valve set at 50 Psig or less, the test pressure shall be held at 5 Psig less than the set pressure. A5 Leakage test Before the leakage test, the set pressure shall be demonstrated and all valve body joints and fittings should be checked with a suitable solution ensure that all joints are tight. Air receiver API 527 Air Leakage Rates Cover plate Before the bubble count, the test pressure shall be applied for the following times: Valve size Time Up 2ins 1 min 3ins 4ins 2 min 6ins and above 5 min The valve shall then be observed for leakage for at least 1 minute. A6 Acceptance criteria For a valve with a metal seat, the leakage rate in bubbles per minute shall not exceed the appropriate value in chart opposite. For a softseated valve, there shall be no leakage for 1 minute (0 bubbles per minute). 49

SEAT TIGHTNESS / SEAT LEAKAGE TESTING (in accordance with API 527) TESTING WITH STEAM S1 Test medium The test medium shall be saturated steam. S2 Test configuration The valve shall be vertically mounted on the steam test stand. S3 Test pressure For a valve whose set pressure is greater than 50 Psig, the seat tightness shall be determined with the test pressure at the valve inlet held at 90% of the set pressure. For a valve set at 50 Psig or less, the test pressure shall be held at 5 Psig less than the set pressure. S4 Leakage test Before starting the seat tightness test, the set pressure shall be demonstrated and the test pressure shall be held for at least 3 minutes. Any condensate in the body bowl shall be removed before the seat tightness test. Air (or nitrogen) may be used dissipate condensate. After any condensate has been removed, the inlet pressure shall be increased the test pressure. Tightness shall then be checked visually using a black background. The valve shall then be observed for leakage for at least 1 minute. S5 Acceptance criteria For both metal and soft-seated valves, there shall be no audible or visible leakage for 1 minute. TESTING WITH WATER IMPORTANT ALL LIQUID TRIM VALVES MUST BE TESTED ON WATER. OTHERWISE SET PRESSURES AND LEAKAGE RATE RESULTS WILL BE FALSE. W1 Test medium The test medium shall be water near ambient temperature. W2 Test configuration The valve shall be vertically mounted on the water test stand. W3 Test pressure For a valve whose set pressure is greater than 50 Psig, the seat tightness shall be determined with the test pressure at the valve inlet held at 90% of the set pressure. For a valve set at 50 Psig or less, the test pressure shall be held at 5 Psig less than the set pressure. W4 Leakage test Before starting the seat tightness, the set pressure shall be demonstrated and the outlet body bowl shall be filled with water. The pressure gauge shall be allowed stabilise with no visible flow from the valve outlet. The inlet pressure shall then be increased the test pressure. The valve shall then be observed for 1 minute at the test pressure. W5 Acceptance criteria For a metal-seated valve whose inlet has a nominal pipe-size of 1 inch or larger, the leakage rate shall not exceed 10 cubic centimetres per hour per inch of nominal inlet size. For a metal-seated valve whose inlet has a nominal pipe size of less than 1 inch, the leakage rate shall not exceed 10 cubic centimetres per hour. For soft-seated valves, there shall be no leakage for 1 minute. IMPORTANT: Test rig cleanlines is vital avoid contamination and damage the safety relief valve seat surfaces. 50

Safeflo - Safety and thermal relief valves 1 Accessories 2 High performance springs 3 Guiding surfaces 4 Trim 51

FEATURES AND BENEFITS Design verification The: B Series (gas/vapour) C Series (liquid) D Series (gas, liquid and steam) have been developed on Birkett s in-house, extensive mass flow test facility. Simplified maintenance For the flanged version, a slip on inlet flange makes it easier realign in existing pipework after servicing. Interchangeable parts Valves can easily be modified from gas liquid or liquid gas with the minimum number of parts. The D Series is certified for all media without modification. Safe and reliable Proven dependability ensures safe and reliable performance. Cryogenic and oxygen service Birkett s state-of-the-art clean room and vapour degreasing facilities ensure compliance with the stringent demands of cryogenic and oxygen applications. (The D Series is not available for cryogenic service.) 1. Wide range of accessories Available comply with international codes and suit system requirements. 2. High performance springs Safety relief valve springs are specially designed guarantee set point repeatability. 3. Guiding surfaces The material selection of guiding components, gether with self aligning disc pivot points, ensures correct alignment and no galling of guiding surfaces. 4. Trim B/C Series valves have been designed with metal trim give optimum performance at higher pressures. The 7D is available with a soft seat or metal seat, while the 6D is metal seated only. Balanced pisn Available on the 7D Series counter the effects of variable back pressure. Material selection A wide range of materials are offered, including non-ferrous for low temperature and oxygen service, and exotic alloys specified for the chemical and process industries. 52

B/C SERIES THERMAL RELIEF VALVES Cryogenic versions of the B and C Series are available ITEM PART CARBON STEEL STAINLESS STEEL 1 Body SA 216-WCB CARB ST SA 351-CF8M ST ST 3 Cap ASTM A108-1021 ASTM A479-316L 4* Nozzle 316 ST ST 316 ST ST 5* Disc 316 ST ST 316 ST ST 6* Disc holder SA564 17/4 (33HRC) SA564 17/4 (33HRC) 9 Guide SA351-CF8M ST ST SA351-CF8M ST ST 11 Lower spring plate ASTM A479-431 ASTM A479-431 12 Adjusting screw ASTM A479-410 ASTM A479-410 13 Locking nut ASTM A479-316L ASTM A479-316L 22* Spring C.S. ALUMINIUM COATED ASTM A313-316 28* Cap gasket ST-706 ST-706 31* Ball AISI 440C ST ST AISI 440C ST ST 32 Upper spring plate ASTM A479 431 ASTM A479 431 33 Data plate 321 ST ST 321 ST ST 34 Hammer drive screw ELECTRO BRASSED CS ASTM A479-316L 76 Capscrew ST ST BS6105 A2-70 ST ST BS6105 A2-70 85 Flange SA 105 CARB ST SA 182-F316 ST ST * Recommended spares. 53

D SERIES THERMAL RELIEF VALVES ITEM PART CARBON STEEL STAINLESS STEEL 1 Body SA 216-WCB CARB ST SA 351-CF8M ST ST 3 Cap SA 216-WCB CARB ST SA 351-CF8M ST ST 4* Nozzle 316 ST ST 316 ST ST 5* Disc 316 ST ST 316 ST ST 9 Guide 17/4 PH ST ST 17/4 PH ST ST 10 Spindle 316 ST ST 316 ST ST 12 Adjusting screw ASTM A479-410 ASTM A479-410 13 Locking nut ASTM A479-316L ASTM A479-316L 22* Spring C.S. ALUMINIUM COATED ASTM A313-316 28* Cap gasket ST-706 ST-706 30 Body gasket ST-706 ST-706 33 Data plate 321 ST ST 321 ST ST 34 Hammer drive screw ELECTRO BRASSED CS. ASTM A479-316L 75 Grub screw ASTM A479-316L ASTM A479-316L 85 Inlet flange SA 105 CARB ST SA 182-F316 ST ST 147 Flange nut SA564 17/4 (33HRC) SA564 17/4 (33HRC) 188 Adjusting screw bush VIRGIN PTFE VIRGIN PTFE 235 Spring end plate ASTM A479-431 ASTM A479-431 * Recommended spares. 54

ACCESSORIES Packed lever The design of the packed lever assembly ensures that leakage does not occur when the valve is open or when back pressure is present. Balanced pisn This option is only available on the 7D Series valves. It is designed overcome the effects of variable back pressure. Open lever design is not available on Safeflo valves. Gag Screw Sealing Plug Test gag The test gag is used prevent the safety valve from lifting. This is mainly used when carrying out a hydrostatic test on the system, during commissioning. The test gag must never be left in the valve. The sealing plug should be fitted at all other times, allowing the valve operate freely. Pressure adjustment: refer page 47. Cold differential test pressure: refer page 47. Seat tightness/seat leakage testing: refer page 49/50. Minimum pressure setting: B Series, normal attitude 10 Psig. C Series, normal attitude 15 Psig. 7D Series, normal attitude 5 Psig. 6D Series, normal attitude 740 Psig. Lower pressures are NOT available by inverting the valve. 55

SAFEFLO - SAFETY AND THERMAL RELIEF VALVE Different types: There are two different types, both are conventional designs. B Series - Safety and thermal relief valve, gas duty. C Series - Safety and thermal relief valve, liquid duty. D Series - Safety and thermal relief valve, gas, steam and liquid duty. All are certified in accordance with ASME Code Section VIII. SAFEFLO FIGURE NUMBERING SYSTEM / / Orifice Area in 2 1 0.062** 2 0.110** 3 0.196** 4 0.442** 6 0.070* 7 0.169* Accessories C Screwed cap P Packed lever G Test gag F Ferrule (Government ring) S Special feature B Balanced pisn R Soft seat Valve series B Gas vapour C Liquid D Gas, steam and liquid Connection size 1 1 2" x 1" orifice 1, 2, 6 or 7 2 3 4" x 1" orifice 1, 2, 6 or 7 3 1" x 1 1 2" orifice 3 4 1 1 2" x 2" orifice 4 screwed only 5 1" x 1" orifice 1, 2, 6 or 7 Inlet connection type A BSP Tr male screwed B BSP female screwed C API male screwed D API female screwed 1 ANSI 300/600 RF flange 2 ANSI 900/1500 RF flange** 3 ANSI 2500 RF flange** 7 ANSI 150 RF flange O Special** Outlet connection type E BSP female screwed F API female screwed 1 ANSI 150 RF flange 2 ANSI 300 RF flange** O Special** Trim - nozzle and disc material 1 Stainless steel PH 17/4 2 Stainless steel 316 4 Hastelloy B** 5 Stainless steel 316 stellited** 6 Monel 400** 7 Stainless steel 304** O Special** Spring material A Aluminium Coated CS 2 Stainless steel 316 6 Tungsten alloy 9 Hastelloy B** T Aluminium Coated Tungsten Z Inconel X750 O Special** Body material 1 Carbon steel WCB 2 Carbon steel WCB NACE 3 Stainless steel CF8M NACE 4 Stainless steel CF8M O Special** *Available on D Series only. **Not available on D Series. Available on 7D only. 56

B/C SERIES DIMENSIONS Female screwed Male screwed Flanged Note: A packed lever version and gagging facility are also available. Sizes (ins) inlet & outlet Inlet & Outlet connection Orifice No. Max pressure up Dimensions ins (mm) 100 F (Psig) A B C* D Inlet Outlet Weight lbs (kg) 1/2 x 1 Screwed 1 2.500-8.625 1.687 5000 Female 2 (64) (219) (43) 3600 425 9 (4) 3/4 x 1 x 1 2.500-8.625 1.687 5000 Female 2 (64) (219) (43) 3600 425 9 (4) 1 x 1 1 2.500-8.625 1.687 5000 2 (64) (219) (43) 3600 425 9 (4) 1 x 11/2 3 3.250-13.750 2.375 (83) (349) (60) 5000 425 26 (12) 11/2 x 2 4 3.250-13.750 2.375 (83) (349) (60) 2500 375 26 (12) 1/2 x 1 Screwed 1 2.562 0.750 9.375 1.687 3000 Male 2 (65) (19) (238) (43) 1480 425 9 (4) 3/4 x 1 x 1 2.562 0.750 9.375 1.687 5000 Female 2 (65) (19) (238) (43) 3600 425 9 (4) 1 x 1 1 2.312 1.000 9.375 1.687 5000 2 (59) (25) (238) (43) 3600 425 9 (4) 1 x 11/2 3 3.250 1.000 14.750 2.375 (83) (25) (375) (60) 3000 425 26 (12) 11/2 x 2 4 3.250 1.125 14.875 2.375 (83) (29) (378) (60) 2500 375 26 (12) 3/4 x 1, 4.625 1.000 10.250 3.750 150# x 150# 1 + 2 1 x 1 (117) (25) (260) (95) 285 285 17 (7.25) 1/2 x 1, 3 /4 x 1, 4.625 1.375 10.250 3.750 300/600# x 150# 1 + 2 1 x 1 (117) (35) (260) (95) 1480 285 17 (7.25) 1/2 x 1, 3 /4 x 1, 4.625 1.187 10.375 3.750 900/1500# x 300# 1 + 2 1 x 1 (117) (46) (264) (95) 3600 425 20 (9) 3/4 x 1, 1 x 1 2500# x 300# 1 4.750 2.000 10.500 3.750 5000 2 (121) (51) (267) (95) 3600 425 20 (9) 1 x 11/2 150# x 150# 3 5.625 1.000 16.750 5.500 (143) (25) (425) (140) 285 285 40 (18) 1 x 11/2 300/600# x 150# 3 5.625 1.375 16.750 5.500 (143) (35) (425) (140) 1480 285 40 (18) 1 x 11/2 900/1500# x 300# 3 5.625 1.812 16.750 5.500 (143) (46) (425) (140) 3600 425 40 (18) 1 x 11/2 2500# x 300# 3 5.625 2.000 16.750 5.500 (143) (51) (425) (140) 5000 425 40 (18) *If a gag screw is fitted, add 2 ins (51mm) dimension C for orifice nos. 1 & 2 only. *If a packed lever is fitted, add 1 3 4 ins (44mm) dimension C for orifice nos. 1 & 2 only. Orifice sizes: refer sizing section, page 84. Minimum set pressure B Series (Gas) = 10 Psig (0.7 Barg) C Series (Liquid) = 15 Psig (1.035 Barg) Orifice No.1 = 1480 Psig (102 Barg) Temperature range (with suitable material selection) -320 F 1,000 F (-196 C 538 C) 425 Psig with 300# outlet 57

D SERIES DIMENSIONS Female screwed Male screwed Flanged Note: A packed lever version and gagging facility are also available. Sizes (ins) inlet & outlet Inlet & Outlet connection Orifice No. Max pressure up Dimensions ins (mm) 100 F (Psig) A B C D Inlet Outlet If a packed lever is fitted, add 1.062 ins (27mm) dimension C for orifice 7 only. If a gag screw is fitted, add 0.395 ins (10mm) dimension C for orifice 7 only. If a balanced pisn is fitted, add 2.125 ins (54mm) dimension C for orifice 7 only. If a gagged balanced pisn is fitted, add 2.520 ins (64mm) dimension C for orifice 7 only. Orifice sizes: refer sizing section, page 84. Minimum set pressure 7D (Gas, Steam or Liquid) = 5 Psig (0.35 Barg) 6D (Gas, Steam or Liquid) = 740 Psig (51 Barg) Temperature range (with suitable material selection) 6D and 7D -51 F 500 F (-46 C 260 C) Weight lbs (kg) 1/2 x 1 Screwed 6 1.732-7.440 2.165 3/4 x 1 Female x Female (44) (189) (55) 1480 285 9 (4) 1 x 1 Screwed 1.687 0.750 8.230 2.165 6 Male x Female (43) (19) (209) (55) 1480 285 9 (4) 3/4 x 1 4.610 1.625 10.315 3.750 ANSI 600# x 150# 6 1 x 1 (117) (41) (262) (95) 1480 285 14 (6.5) 1/2 x 1 Screwed 7 1.732-7.440 2.165 3/4 x 1 Female x Female (44) (189) (55) 740 285 9 (4) 1 x 1 Screwed 1.687 0.750 8.230 2.165 7 Male x Female (43) (19) (209) (55) 740 285 9 (4) 3/4 x 1 ANSI 150# x 150# 4.610 1.625 10.315 3.750 285 7 1 x 1 ANSI 300# x 150# (117) (41) (262) (95) 740 285 14 (6.5) 58

Safeset - Pilot operated safety relief valve 1 Close differential pressure setting 15 State-of-the-art pisn seals 2 Close blowdown and overpressure lerance 14 Two part pisn assembly 3 Non-flowing pilots 4 Integral pilot filter 5 All stainless steel pilots, dome, tubes and fittings 6 Adjustable orifice areas 7 Full lift capability 8 Soft seat 9 Enhanced seat tightness 10 Unique full nozzle design 11 API 526 compliant 13 Dual outlet option 12 Integral sensing of pilot 59

FEATURES AND BENEFITS Close system operating pressure The system operating pressure can be much closer the set pressure on a pilot operated valve than with a standard spring loaded safety relief valve. System pressures in the region of 95% 98% of set pressure are often accommodated. Tolerates high inlet pressure loss High inlet pressure losses due difficult inlet piping systems can be accommodated by remote sensing the pilots, hence trouble free operation can be assured. 1. Close differential pressure setting Pop acting pilot valves are quick acting and hence there is no delay between the pilot and the main valve opening pressures. Modulating valves inherently have a delay, which is nominally 2%. This ensures the pilot is not leaking when the system pressure is close the set pressure. 2. Close blowdown and overpressure lerance Pop action pilots can be adjusted give zero overpressure and a blowdown typically equal 3% of set pressure. 3. Non flowing pilot Safeset pilots are of the non flowing design. The risk of freezing due pressure drops in the flowing medium is removed. Additionally, dirt particles are not transported the pilot as the medium is static. This improves life in service and ensures trouble free operation. 7. Full lift capability Pilot valves will maintain full lift against high levels of back pressure. Unlike spring loaded valves, which would need either differential setting or the addition of balanced bellows. 8. Soft seat Safeset pilots and main valves are soft seated give optimum leak tightness. Materials are available for a wide range of duties. Maintenance is simplified as seat lapping is reduced. 9. Enhanced seat tightness The main valve is pisn operated. The pisn area is in excess of 30% larger than the seat bore area. This ensures the seat closing force is always at least 30% greater than the seat opening force for all pressures, right up the set point. This produces more effective seat tightness, reducing the possibility of seat leakage. A spring loaded valve will have maximum seat clamping force when there is no system pressure. As the system pressure approaches the set point, the upward acting valve opening force approaches the closing force generated by the spring, hence the clamping force approaches zero and seat leakage may occur. A pilot valve with a 30% differential pisn design will maintain a 30% seat clamping force right up the set point, ensuring maximum seat tightness. 4. Integral pilot filter Safeset pilots are fitted with integral filters. 5. Stainless steel Safeset pilots, domes, tubes and fittings, pisns and nozzles are made from stainless steel as a minimum, i.e. all process wetted parts. This reduces the risk of oxides contaminating seals and hence prolongs their life in service. 6. Adjustable orifice areas The standard range of single outlet main valves consists of 8 body sizes, which by simple adjustment accommodates all 21 standard orifice sizes. This allows for easy adjustment should service conditions dictate a change in required orifice area. Seat clamping = force Valve closing force Valve opening force 60

10. Unique full nozzle design The nozzle is a patented push-in design, held in position with a locking ring. Being of the full nozzle design, it reduces mechanical and thermal stresses at the seat, reduces inlet pressure losses, increases the discharge co-efficient and allows for lower specification body materials on corrosive duties. 11. API 526 compliant Fully conforms the latest edition of API 526 for pressure/ temperature ratings and over flange dimensions for pilot valves. 14. Two part pisn-disc assembly This gives a reduced guiding geometry, keeping the size of the components within the body bowl a minimum, thus increasing the effective discharge area through the valve outlet. 15. State of the art pisn seals and bearing rings Reduce friction and galling of materials at the guide and pisns surfaces essential for modulating pilots. 12. Integral sensing Safeset pilots are sensed from the nozzle, giving a compact design and accurate pressure sense from within the flow stream. Remote sensing for difficult inlet piping systems is recommended. 13. Dual outlet option The 8 inch valve is also available with a dual outlet (see below). DUAL OUTLET / FULL BORE PILOT VALVE This valve is suitable for extremely high capacity duties. It achieves maximum discharge capacities by having a full bore 8 inch inlet with an available discharge area of 44.178 sq.in. and two opposing 10 inch outlets, which can assist with reaction force problems. Available with all Pilot Types 2, 4, and 8. 61

MODE OF OPERATION Safeset consists of a separate pilot valve connected a main valve via a sensing pipe. This pipe senses the inlet pressure within the main valve nozzle and provides the pressure signal the pilot. Pilot valve The pilot valve controls the discharge of fluid through the main valve by responding accurately the system pressure. All Birkett pilots are of a non flowing design, which means there is an absence of system flow through the pilot during the relief cycle. Main valve The main valve conforms the latest version of API 526 Pressure/Temperature ratings and face face dimensions. It has 21 orifice variants in just 8 inlet x outlet body sizes. Safeset is a differential pisn operated design, the opening is controlled by the pilot valve. The benefits of non flowing designs are that freezing of moisture-containing fluid and the carrying of particulate matter in the pilot are minimised, ensuring correct valve performance. PILOT VALVE TYPES Pop (Type 2) Controls the main valve in a rapid manner, it is either open or closed. Specifically for gas applications. Modulating (Types 4 and 8) The main valve is opened in a controlled manner, the over pressure is constantly monired and the opening of the main valve is proportionate the overpressure. BASIC OPERATION OF SAFESET Simply, the pilot valve is a very accurate springloaded safety valve, with two seats. At low system pressures, pressure from the system is fed from the inlet nozzle, through the sense line, past the lower pilot seat and in the main valve dome. The dome area is in excess of 30% larger than the seat bore area. This differential of areas ensures that the main valve remains closed. When the system pressure reaches the set point of the pilot, the lower pilot seat closes and the upper pilot seat opens, releasing the dome pressure the atmosphere. With no pressure above the pisn, the main valve opens. The reverse of this sequence of events occurs when system pressure falls and once again the main valve dome will be fed with system pressure, which in turn closes the main valve. 62

POP ACTION - TYPE 2 PILOT Pilot construction The pilot is essentially a spring loaded safety valve with blowdown adjustment which, during its operation, positions itself on one of two seats. The upper drain seat is used determine pilot set pressure, the lower feeding seat determines pilot blowdown. The valve disc is held on the soft upper drain seat by the setting spring, which also determines the pilot set pressure. This valve disc is connected via a spindle the lower feeding seat, which controls the system flow in the dome and which also controls the pilot blowdown. TO AND FROM MAIN VALVE DOME FEEDING SETTING SPRING DISC UPPER DRAIN SEAT EXHAUST SPINDLE The valve disc and lower feeding seat move gether; this action opens and closes each respective seat, thereby allowing the pilot control the operation of the main valve during the relieving cycle. LOWER FEEDING SEAT FILTER Pilot operation With pop action pilot operation, the main valve is either in the fully open or shut position. The operation is characterised by a distinct rapid pop action, which is evident at the opening of the main valve, followed by a positive re-seat action when the main valve closes. The re-seat pressure of the Type 2 pilot valve is adjustable externally, independently of the set pressure adjustment. This graph demonstrates pop action. When set pressure is reached, the pilot valve opens rapidly; this action de-pressurises the dome volume very quickly and the main valve opens. This is shown by the vertical (rising) line on the graph, illustrating that the main valve achieves its design lift at set pressure. The re-seating characteristic is equally positive: when the system pressure has fallen the pre-set pilot re-seat pressure, the pilot drain seat closes rapidly. This action allows the dome be repressurised very quickly, thereby closing the main valve completely. This is shown on the graph by the vertical (falling) line. 63

STAGES OF OPERATION - TYPE 2 PILOT Stage 1 System pressure below the pilot set pressure, dome pressurised, main valve closed. Stage 2 System pressure equal set pressure, drain seat opens, dome de-pressurises, main valve fully lifts with no overpressure. Stage 3 System pressure equal or greater than set pressure, dome pressure is atmospheric, main valve is fully open. Stage 4 System pressure falls equal the re-seat pressure, drain seat closes, feeding seat opens, dome is pressurised, main valve closes. Stage 5 System pressure below the pilot set pressure, dome pressurised, main valve closed and ready for next upset condition. Key Points Pilot Type 2 Pilot set pressure = Main valve set pressure. Main valve fully open at 0% overpressure. The pilot is non flowing. Adjustable blow-down feature. Integral filter fitted. Gas duty only. 64

MODULATING ACTION - TYPE 4 Pilot construction Modulating pilots are essentially diaphragm or pisn operated safety valves with a feedback pisn for fine control of the pressure in the dome. The Type 4 Pilot is used for pressures up 1480Psig DETECTOR DIAPHRAGM SETTING SPRING When the set pressure is reached the main valve opens in proportion the system pressure rise. This is achieved by the pilot controlling the dome pressure. The main valve will maintain a lift necessary discharge the system flow. As the system pressure increases, the main valve lift will change accommodate the new flow condition. As the system pressure falls, the main valve will begin close, finally closing at a pressure just below the set pressure. The diaphragm senses the system pressure and the feedback pisn senses the dome pressure. The combination of these pressures accurately provide a force balanced with the adjusting spring open/close the feeding/drain seats. This maintains dome pressure for accurate positioning of the main valve. FEEDBACK PISTON FEEDING FILTER FEEDING SEAT Type 4/1 Pilot (29 100 Psig) DOME RETURN SPRING DRAIN DRAIN SEAT DETECTOR PISTON Type 4/2 Pilot (100 1480 Psig) Note: The Pilot Type 4 always drains the main valve outlet, and a back flow preventer should be fitted (see page 72). 65

MODULATING ACTION - TYPE 8 The Type 8 Pilot is similar the Type 4 Pilot except that instead of using a diaphragm lift the valve, the Type 8 Pilot uses a pisn. SETTING SPRING The pressure range for the Type 8 Pilot is 1480 Psig 6170 Psig. Note: The Type 8 Pilot always drains the main valve outlet, and a back flow preventer should be fitted (see page 72). FEEDBACK PISTON DOME DETECTER PISTON RETURN SPRING FEEDING SEAT DRAIN DRAIN SEAT FILTER FEEDING Type 8 Pilot PILOT OPERATION The action of the main valve may be characterised as modulating. In order achieve this the pilot accurately controls the pressure in the main valve dome which positions the main valve disc match the system upset flow condition; this will then control the system pressure. Effective pilot operation requires a small overpressure above the set pressure, achieve full design lift of the main valve and a small pressure drop re-seat the main valve. A typical modulating performance is shown in the graph opposite. The overpressure as a percentage of set pressure will vary with the system flow requirement; this means that an infinite number of relieving cycles can occur within the limits shown. The valve lift will, however, always be in proportion the rise in system pressure, ensuring a safe stable relief cycle. 66

STAGES OF OPERATION - TYPES 4 AND 8 Type 4 & 8 Pilots are fully modulating. They are intended for use with gas, liquid and mixed phase fluids. Both types are non flowing designs. STAGE 1 System pressure below set pressure The feeding seat remains open with the drain seat closed. This maintains equal pressures in the dome and the system. The main valve is closed, held tightly against the nozzle. Pilot Valve Drain STAGE 2 System pressure approaches set pressure When the system pressure approaches the set pressure the feeding seat closes. The drain seat remains closed and the main valve is closed. The pressure in the dome is now controlled by the inlet system pressure acting against the pilot diaphragm/pisn and the dome pressure acting on the feed back pisn. The combination of these two forces controls the opening of the drain seat, thereby controlling the dome pressure and hence the main valve lift. When the drain seat opens it discharges a small volume of fluid from the dome. At no time is the drain seat continually flowing. It drains in short bursts. P STAGE 3 System pressure reaches set pressure As the system pressure gradually rises the set pressure, the dome pressure gradually falls approximately 30%. Due the differential size, p and botm of the pisn, the main valve opening and closing forces are now in equilibrium. 67

STAGE 4 System pressure above set pressure As the system pressure increases above the set pressure, modulation occurs with the main valve opening an amount sufficient maintain system flow rate. This is brought about by the increased system pressure acting against the pilot diaphragm/pisn re-open the drain seat. The dome pressure is reduced further, allowing the main valve open. The reduced dome pressure now acting on the feedback pisn produces a lower upward force and the adjusting spring closes the drain seat. The above actions cycle in very small increments and hence give the modulating effect. STAGE 5 Main valve fully open The main valve will be fully open before the system pressure reaches 110% of the set pressure. STAGE 6 Main valve closes When the system upset condition has ended, the system pressure will begin fall. The reduced system pressure acting on the pilot diaphragm/pisn will cause the feeding seat reopen. This will increase the dome pressure and the main valve will begin close. The feeding seat will close as the dome pressure increases due the feedback pisn effect. This cycle will repeat as the system pressure is further reduced. The main valve will close with a progressive action. When the system pressure reaches approximately 97% of set pressure the main valve will be closed. Key points Pilot Types 4 and 8 Pilot set pressure is when the drain seat first opens. Main valve discharge maintains the system pressure at its respective flow condition, thereby achieving fully modulating action. The pilot valve is firmly closed when the main valve closes. Integral filter fitted. 68

TECHNICAL SPECIFICATION - PILOT VALVE Valve type 2 4 8 Pilot action Pop Modulating Modulating Fluid Gas Gas, Liquid Gas, Liquid Dual Phase Dual Phase Overpressure 0% <10% <10% Blowdown 3-10%* <3% <3% Adjustable Fixed Fixed Pilot/main valve set pressure differential 0% 5% 2% Max back pressure Built up and Superimposed 70% 70% 70% Back pressures in excess of these limits can be accommodated - consult facry Pressure (Psig) 29-6170 29-1480 1480-6170 range (Barg) 2.0-425.5 2.0-102 102-425.5 High pressure pilots are available - consult facry Temp. range (deg F) -65 500-65 500-65 500 (deg C) -54 260-54 260-54 260 Accessories are available for cryogenic and high temperature applications - consult facry *Unless otherwise required or specified, the type 2 Pilot will be facry set for 5% blowdown. Type 2 Pilot must have the exhaust vent open atmosphere or piped a safe area. Types 4 and 8 Pilots always have their exhaust vents connected in the main valve outlet. MAIN VALVE - SOFT GOODS Material Temperature Pressure range degf (degc) Psig (Barg) Main valve seat St St filled PTFE -50/500 (-46/+260) Up 1480 (102) PEEK -85/500 (-65/+260) Over 1480 (102) Vin -4/400 (-20/+205) Up 1480 (102) Buna-N -50/248 (-46/+120) Up 1480 (102) Polyurethane -65/300 (-54/+150) 400/1480 (27.6/102) Main valve seat (NACE) PEEK -85/500 (-65/+260) Over 1480 (102) Vin -4/400 (-20/+205) Up 1480 (102) Polyurethane -65/300 (-54/+150) 400/1480 (27.6/102) Gaskets Carbon Fibre -50/500 (-46/+260) All pressures Laminated graphite -50/500 (-46/+260) All pressures PILOT VALVE - MATERIALS Material Temperature degf (degc) Body Bonnet Spring Trim St St 316 All St St 316 All St St 316 All St St 316 All Pilot seat and seals Buna-N -50/248 (-46/+120) Vin -4/400 (-20/+205) EPR -65/300 (-54/+150) EPDM -50/400 (-46/+205) Aflas -20/400 (-29/+205) Heating or cooling coils required above 400degF (205degC) and below -50degF (-46degC) Static seals Vin -4/400 (-20/+205) Up 1480 (102) AED Vin -4/400 (-20/+205) Over 1480 (102) Options: Buna-N, Aflas, Chemras, Kalrez 69

MATERIALS OF CONSTRUCTION - MAIN VALVE BODY MATERIAL CARBON STEEL STAINLESS STEEL Item Description -29 +260 ºC -46 +260 ºC -46 +260 ºC 1 Body SA 216 WCB SA 352 LCB SA 351 CF8M 2 Nozzle St. St. 316 St. St. 316 St. St. 316 3 Guide St. St. 17/4 St. St. 17/4 St. St. 17/4 4 Disc holder St. St. 316 St. St. 316 St. St. 316 5 Disc insert Vin * Vin * Vin * 6 Pisn St. St. 316 St. St. 316 St. St. 316 7 Locknut St. St. 316 St. St. 316 St. St. 316 8 Lift sp St. St. 316 St. St. 316 St. St. 316 9 Cover St. St. 316 St. St.316 St. St. 316 10 Retaining plate St. St. 316 St. St. 316 St. St. 316 11 Disc holder seal Vin * Vin * Vin * 12 Pisn seal Vin * Vin * Vin * 13&25 Guide rings Carbon/PTFE Carbon/PTFE Carbon/PTFE 14 Body stud A193/B7 A193/B8T A193/B8T 15 Body nut A194/2H A194/8T A194/8T 16 Lock ring St. St. 316 St. St. 316 St. St. 316 19 Spring St. St. 316 St. St. 316 St. St. 316 20 Body gasket Carbon fibre Carbon fibre Carbon fibre * 21 Guide seal Vin * Vin * Vin * 22 Nozzle seal Vin * Vin * Vin * 23 Retaining plate screw Vin * Vin * Vin* 24 Counter sunk screw St. St. 316 St. St. 316 St. St. 316 27 Fittings St. St. 316 St. St. 316 St. St. 316 32 Tubes St. St. 316 St. St. 316 St. St. 316 42 Drain plug HTS HOLO-KROME HTS HOLO-KROME ASTM A479-316L Note: *Soft goods materials listed above are standard. For a full listing cover the temperature ranges of the body materials listed above, it is necessary refer the seals, gaskets, selection table on the previous page. Maximum temperature is limited by the seal material. Alternative materials and accessories are available, for NACE, high temperatures and cryogenic applications. 70

ACCESSORIES Back Flow Preventer Exterior Supply Filter 71

ACCESSORIES Back flow preventer High back pressures may exist in the outlet for various reasons such as common disposal systems. If this back pressure can be more than the inlet system operating pressure, the main valve could lift allowing reverse flow from the outlet inlet system. A back flow preventer is a two-way check valve, which is fitted in the dome line. It allows the highest pressure from either the inlet system or outlet system enter the dome, ensuring the main valve remains closed and prevents the possibility of reverse flow. All modulating pilots (Types 4 + 8) should be fitted with a back flow preventer. A back flow preventer should always be fitted if a vacuum can exist in the inlet pipework. When using back flow preventers with back pressure above 50% of the set pressure, the actual service conditions must be reviewed by the facry. External supply filter This unit protects the pilot valve when working under dirty flow stream conditions. All Safeset pilots are fitted with integral filters as standard; however, under conditions where there is likely be large amounts of particulate matter in the flow stream, a supply filter should be used. This unit is fitted in the pilot sensing pipe, upstream of the pilot, and is suitable for gas and liquid duty. It is removed easily for maintenance. Remote Pressure Sensing Sense Line (Max 100ft/30m including one 90 bend. Min inside diameter 0.254"/6mm) Remote pressure sensing Many codes and standards restrict the inlet pipework pressure loss 3% of the safety valve set pressure. There are occasions however, when the pipework loss is greater than this. In these instances the safety valve should always be connected for remote sensing. The valve is normally supplied with integral sensing; this means that the pilot senses pressure at the main valve nozzle entry. Under conditions of excessive system pressure loss, the valve, under flowing conditions, may cycle open and closed. This is due the pilot sensing a reduced (artificial) pressure. In order overcome this problem the valve should be sensed remotely. The pilot in this case should have its inlet connected directly the pressure source where the system pressure is stable and not flowing. The main valve nozzle will not contain a sensing tapping in this case. Excessive system pressure losses will also reduce the flow rate through the valve. This will be in proportion the absolute system pressure and must be taken in account when sizing the valve. Remote sensing will ensure that the pilot operated safety valve operates without cycling or chatter when high inlet pressure losses are encountered. 72

ACCESSORIES Heating or Cooling Coils Field Test Connecr Remote Pressure Sensing Heating or cooling coils High or low temperature duties may require the addition of coils act as heat exchangers either warm or cool the medium before it enters the pilot valve or main valve dome. This ensures that extremeties of temperature do not affect the operation of the safety valve. The use of such coils allows us use standard pilots on valves with inlet temperatures in the range of - 196 C (-320 F) 260 C (500 F). Field test connecr This provides verification of set pressure setting during normal system operation. The field test connecr is a two way check valve which is fitted in the sensing pipe and is an integral part of the pilot operated valve system. If this facility is required, it must be specified on the valve order. An external pressure supply needs be connected the check valve via an isolating valve and pressure gauge. The external pressure should be admitted slowly through the supply isolating valve. When the supply pressure is greater than the system pressure the check valve delivery seat will open and the system seat will close. Pressure can now be applied the pilot and dome. When set pressure is reached the pilot will open. N.B. Pop action pilots will pop open; this is the main valve set pressure. Modulating pilots will start vent from their drain seat; this will occur at approximately 2% below the main valve set pressure. The nameplate should be referred in order obtain the main valve set pressure. The main valve may open briefly with pop action pilots. 73

ACCESSORIES Others Similar the spring loaded safety relief valves (see page 15), pilot valves can be fitted with: Packed lift levers. Ferrules (government rings). Test gags (max pressure 1480 Psig). Available options Dual pilot assemblies. Dual pilot interlock system. Heated or unheated control cabinets. Dual outlet/full bore design. Differential pressure switch. Dual pilots If a process plant is running, it is earning a profit for its operar. Traditionally, when a valve required maintenance the plant had be shut down, resulting in reduced earning time. A solution this is install a second pilot on the main valve and install a simple system of ball valves or an interlocked changeover valve system, thus allowing one pilot be removed while the plant is still operating. We can offer either solution. 74

ACCESSORIES Remote unloader This device enables the main valve be opened remotely. It is a three way spool valve which can be operated electronically or pneumatically. The valve is mounted in the dome line and allows a free flow from the pilot in the dome. When remote operation is required, a signal (pneumatic or electrical) opens the exhaust vent of the spool valve and vents the dome, allowing the main valve open. The valve will normally be supplied mounted on the main valve with the dome connected directly the pilot. When the spool valve is energised the dome will vent directly atmosphere. Remote Unloader 75

SAFESET PILOT FIGURE NUMBERING SYSTEM P / Inlet diameter 1-8" Orifice designation D-T X = 8" x 10" x 10" full bore Outlet diameter 2" - 10" Pilot description 2 Pop action, gas 4 Modulating, LP 8 Modulating, HP ANSI flange rating 1 150 x 150 2 300 x 150 3 600 x 150 5 900 x 300 7 1500 x 300 8 2500 x 300 A 600 x 300 B 1500 x 600 C 2500 x 600 O Special Flange type 1 ANSI RF x RF 2 ANSI RTJ x RF O Special Main valve body code 1 Carbon steel SA 216-WCB 2 Carbon Steel SA 216-WCB (NACE) 3 St steel SA 351-CF8M (NACE) 4 St steel SA 351-CF8M O Special Accessories A Remote pressure sensing B Back flow preventer C Cooling/heating coils D Screwed cap E External filter **G Test gag *L Liquid duty P Packed lever T Field test connecr U Remote unloader S Special Pressure range Psig (Barg) Range Type 2 Type 4 Type 8 1 29-6170 29-100 1480-6170 (2.0-425.5) (2.0-6.8) (102-425.5) 2 >100-1480 (>6.8-102) These are min/max pressures of the pilot. Several springs are required cover these ranges Main valve trim 1 St St 316 and PEEK 2 St St 316 and Vin 4 St St 316 and Buna N 8 St St 316 and Polyurethane 9 St St 316 and PTFE O Special Main valve spring material 2 St steel 316 Z Inconel X750 (NACE) O Special *Dual phase duties should use the liquid trim versions of the modulating pilot Types 4 and 8 **Test gag available a max pressure of 1480 Psig 76

DIMENSIONS Size Orifice Rating A (ins) D (ins) B (ins) C (ins) C (ins) C (ins) Weight (ins) Type 2 Type Remote lbs (kg) 4 and 8 pilot 1 x 2 D, E, F 150x150 4.13 4.50 1.69 14.00 19.00 9.00 42 (19) 300x150 4.38 4.50 1.69 14.00 19.00 9.00 45 (20.5) 600x150 4.38 4.50 1.69 14.00 19.00 9.00 45 (20.5) 900x300 4.94 4.75 2.25 16.00 21.00 11.50 53 (24) 1500x300 4.94 4.75 2.25 16.00 21.00 11.50 53 (24) 2500x300 4.94 4.75 2.25 16.00 21.00 11.50 53 (24) 1.5 x 2 D, E, F 150x150 4.88 4.75 1.69 14.50 19.50 9.50 46 (21) 300x150 4.88 4.75 1.69 14.50 19.50 9.50 49 (22) 600x150 4.88 4.75 1.69 14.50 19.50 9.50 49 (22) 900x300 5.88 5.50 2.63 17.00 22.00 12.50 57 (26) 1500x300 5.88 5.50 2.63 17.00 22.00 12.50 57 (26) 2500x300 5.88 5.50 2.63 17.00 22.00 12.50 57 (26) 1.5 x 3 G, H 150x150 5.13 4.88 1.69 15.00 20.00 10.25 55 (25) 300x150 5.13 4.88 1.69 15.00 20.00 10.25 62 (28) 600x150 5.13 4.88 1.69 15.00 20.00 10.25 62 (28) 900x300 6.38 6.75 2.62 18.25 23.25 13.50 79 (36) 1500x300 6.38 6.75 2.62 18.25 23.25 13.50 79 (36) 2500x300 6.38 6.75 2.62 18.25 23.25 13.50 79 (36) 2 x 3 G, H, J 150x150 5.38 4.88 1.81 15.25 20.25 10.50 55 (25) 300x150 5.38 4.88 1.81 15.25 20.25 10.50 60 (27) 600x150 5.38 4.88 1.81 15.25 20.25 10.50 64 (29) 900x300 6.56 6.75 2.44 19.25 24.25 14.50 93 (42) 1500x300 6.56 6.75 2.44 19.25 24.25 14.50 93 (42) 1500x600 6.56 6.75 2.44 19.25 24.25 14.50 93 (42) 2500x300 7.00 6.75 2.88 19.25 24.25 15.00 104 (47) 2500x600 7.00 6.75 2.88 19.25 24.25 15.00 104 (47) SINGLE OUTLET Notes: Certified dimensions available on request. Dimensions A and B are for RF inlet, sensed integrally and remotely. Dimensions A and B are for RTJ inlet, sensed remotely. Add 1/2" dimensions A and B for RTJ inlets 1" 3" when sensed integrally. Add 3/4" dimensions A and B for RTJ inlets 4" 6" when sensed integrally. Add 1" dimensions A and B for RTJ inlet 8" when sensed integrally. Height may vary. Weight is approximate for Type 2 Pilot. For Types 4 and 8 Pilots add approx. 5kg. Cap withdrawal 40mm (1.6"). Additional filter 3.5kg. 77

Size Orifice Rating A (ins) D (ins) B (ins) C (ins) C (ins) C (ins) Weight (ins) Type 2 Type Remote lbs (kg) 4 and 8 pilot 3 x 4 J, K, L 150x150 6.13 6.38 2.00 17.00 22.00 12.00 137 (62) 300x150 6.13 6.38 2.00 17.00 22.00 12.00 137 (62) 600x150 6.33 6.38 2.25 17.25 22.25 12.25 154 (70) 600x300 7.50 7.13 3.00 20.25 25.25 15.50 183 (83) 900x300 7.50 7.13 3.00 20.25 25.25 15.50 205 (93) 1500x300 7.50 7.13 3.00 20.25 25.25 15.50 214 (97) 1500x600 7.50 7.63 3.00 20.25 25.25 15.50 227 (103) 4 x 6 L, M, 150x150 7.75 8.25 2.31 20.75 25.75 15.50 225 (102) N, P 300x150 7.75 8.25 2.31 20.75 25.75 15.50 225 (102) 600x150 7.75 8.25 2.31 20.75 25.75 15.50 225 (102) 600x300 9.81 9.19 3.38 25.00 30.00 19.75 370 (168) 900x300 9.81 9.19 3.38 25.00 30.00 19.75 390 (177) 1500x300 9.81 9.19 3.38 25.00 30.00 19.75 401 (182) 1500x600 9.81 10.38 3.57 25.25 30.25 20.25 456 (207) 6 x 8 Q, R 150x150 9.44 9.50 2.31 25.50 30.50 20.50 403 (183) 300x150 9.44 9.50 2.31 25.50 30.50 20.50 408 (185) 600x150 9.69 9.50 2.75 25.50 30.50 20.75 419 (190) 600x300 9.69 10.44 2.75 26.00 31.00 21.00 556 (252) 8 x 10 S, T 150x150 10.88 11.00 2.69 29.00 34.00 24.50 595 (270) 300x150 10.88 11.00 2.69 29.00 34.00 24.50 661 (300) 600x150 11.69 11.00 3.25 29.75 34.00 24.25 728 (330) 600x300 11.69 12.00 3.25 30.25 35.25 25.75 948 (430) 8x10x10 X 150x150 10.88 11.00 1.75 31.75 36.75 31.00 959 (435) 300x150 10.88 11.00 1.75 31.75 36.75 31.00 959 (435) DUAL OUTLET 78

OPERATING PRESSURES Maximum Operating Pressures API 526 Size Orifice ANSI Maximum (ins) Flange Pressure (Psig) Inlet Outlet Inlet Outlet 1x2 D, E, F 150 150 285 285 300 150 740 285 600 150 1480 285 900 300 2220 740 1500 300 3705 740 2500 300 6170 740 1 1 /2x2 D, E, F 150 150 285 285 300 150 740 285 600 150 1480 285 900 300 2220 740 1500 300 3705 740 2500 300 6170 740 1 1 /2x3 G, H 150 150 285 285 300 150 740 285 600 150 1480 285 900 300 2220 740 1500 300 3705 740 2500 300 6170 740 2x3 G, H 150 150 285 285 300 150 740 285 600 150 1480 285 900 300 2220 740 1500 300 3705 740 2500 300 6170 740 2x3 J 150 150 285 285 300 150 740 285 600 150 1480 285 900 300 2220 740 1500 300 3650 740 2500 300 3650 740 3x4 J, K 150 150 285 285 300 150 740 285 600 150 1480 285 900 300 2220 740 1500 300 3705 740 Maximum Operating Pressures API 526 Size Orifice ANSI Maximum (ins) Flange Pressure (Psig) Inlet Outlet Inlet Outlet 3x4 L 150 150 285 285 300 150 740 285 600 150 1240 285 600 300 1480 740 900 300 2220 740 1500 300 2900 740 4x6 L, M, N 150 150 285 285 300 150 740 285 600 150 1480 285 900 300 2220 740 1500 300 3705 740 4x6 P 150 150 285 285 300 150 740 285 600 150 1305 285 600 300 1480 740 900 300 2220 740 1500 300 3080 740 1500 600 3705 1480 6x8 Q 150 150 285 285 300 150 740 285 600 150 1330 285 600 300 1480 740 6x8 R 150 150 285 285 300 150 740 285 600 150 915 285 600 300 1480 740 8x10 T 150 150 285 285 300 150 740 285 600 150 900 285 600 300 1480 740 8x10x10 X 150 150 285 285 300 150 740 285 Notes: Outlet pressure limits for temperature above 100 F conform ANSI/ASME B16.34. Pressure ratings given are for carbon steel bodies at -20 F 100 F. Austenitic stainless steel and other materials suitable for the service may be used within the code limits for pressure and temperature. API Standard 526 specifies lower allowable pressures for service temperatures above and below the ranges given in these charts, for both carbon and stainless steel bodies. 79

FLANGE PRESSURE / TEMPERATURE LIMITS Graph 1.0 ANSI Class 150,300,600 Inlet Flange Valves Set Pressure (Barg) Graph 2.0 ANSI Class 900,1500,2500 Inlet Flange Valves Set Pressure (Barg) Valves can be operated down -196 C (-320 F) when fitted with appropriate heating coils. 80

VALVE SIZING Overview A safety valve is fitted restrict system overpressure a predetermined level; this is normally 110% of the safety valve set pressure. In order ensure that the overpressure is not exceeded, the flow rate through the safety valve has be calculated. This calculation uses formulae which are derived from ASME VIII and API 520 Codes which are recognised throughout the world. Sizing The sizing of the safety valve uses data from the physical properties of the fluid, the valve set pressure, overpressure limits and effective discharge area. Formulae are presented for sizing valves on steam, gas and liquid. The constants used in the sizing formulae may have a different value dependent upon the valve type; where this is the case, it is clearly illustrated on the graph or table. All discharge coefficients are relative the valve type and have been approved the ASME VIII Code. Capacity tables are also shown for sizing on dry saturated steam, air and water. When calculating the flow rate through the safety valve, it is important that the flow rate through the valve is greater than the required flow rate generated by the system. Selection The safety valve selected must be suitable for the pressure and temperature required in the system; the appropriate section of the safety valve catalogue should be referred. The selected tal discharge area of the safety valve must always be greater than the calculated discharge area required relieve the system flow rate under all working conditions. VALVE SIZING FORMULAE Gas and Vapour Flow (1) Mass Flow (imperial units) A = W TZ C P Kd Fb Ff Fp M Kc (2) Volumetric Flow (imperial units) A = Q GTZ 1.175 C P Kd Ff Fb Fp Kc (3) Constant (C) (imperial units) Table 1 C = 520 k 2 k+1 k+1 k-1 Nozzle Gas Constant K C C K C C Imperial Metric Imperial Metric 1.00 315 2.40 1.38 354 2.69 1.02 318 2.41 1.40 356 2.70 1.04 320 2.43 1.42 358 2.72 1.06 322 2.45 1.44 359 2.73 1.08 324 2.46 1.46 361 2.74 1.10 326 2.48 1.48 363 2.76 1.12 329 2.50 1.50 364 2.77 1.14 331 2.51 1.52 366 2.78 1.16 333 2.53 1.54 368 2.79 1.18 335 2.55 1.56 369 2.80 1.20 337 2.56 1.58 371 2.82 1.22 339 2.58 1.60 372 2.83 1.24 341 2.59 1.62 374 2.84 1.26 343 2.61 1.64 376 2.85 1.28 345 2.62 1.66 377 2.86 1.30 347 2.63 1.68 378 2.87 1.32 349 2.65 1.70 380 2.89 1.34 350 2.66 2.00 400 3.04 1.36 353 2.68 2.20 412 3.13 81

(4) Constant, Fb Fb = 2k k-1 Pb P k 2/k (k+1)/k - Pb P (k+1)/(k-1) 2 k+1 Liquid viscosity correction (Fv): When a relief valve is sized for viscous liquid service, it should first be sized as it was for nonviscous type application so that a preliminary required discharge area, A, can be obtained. The next larger orifice size should be used in determining the Reynold s number, R, from either of the following relationships: Steam Flow (Sonic and Subsonic flow) (5) Mass Flow (imperial units) or R = VL(2800G) e A (8) A = W 51.5 P Kd Fsh Fb Ff Fn Fp Kc R = 12,700VL u A (9) Viscosity Correction Facr Fv High pressure steam correction facr Fn:- Fn = 1.0 when P 1515 Psia Use the following formulae when P>1515 Psia (104.5 Bara) and P<3215 Psia (221.7 Bara) (6) Fn (imperial units) 0.1906 P - 1000 Fn = 0.2292 P - 1061 Liquid Flow (7) Liquid Flow (imperial units) A = VL G 38 Kd F1 Fv Kc (Pg - Pbg) Graph 1.0 Facr FV - capacity correction due viscosity. where: VL = flow rate at the flowing temperature, in U.S. gallons per minute. G = specific gravity of the liquid at the flowing temperature referred water (1.00 at 70ºF). e = absolute viscosity at the flowing temperature, in centipoise. A = effective discharge area, in square inches (from manufacturer s standard orifice areas). U = viscosity at the flowing temperature, in Saybolt Universal seconds. Note: Equation 9 is not recommended for viscosities less than 100 Saybolt Universal seconds. Hence use Fv = 1 After the value of R is determined, the facr Fv is obtained from graph 1.0. Fv is applied correct the preliminary required discharge area. If the corrected area exceeds the chosen standard orifice area, the above calculations should be repeated using the next larger standard orifice size. R = Reynold s Number 82

NOMENCLATURE Symbol Description Imperial Units A Orifice discharge area sq. ins C Gas constant, from the specific heat ratio (k); if unknown use 315 (see page 81 equation (3) or Table 1)...dimensionless... e Liquid absolute viscosity...centipoise... Ff Back pressure correction facr for gas - takes account of subsonic flow Balanced Bellows Valves (Page 87, Graph 2.0) Fb Back pressure correction facr for gas - takes account of subsonic flow Conventional Spring Loaded; WB 400; B Series; Pilot Operated Valves; Type 2, 4 and 8 Pilots: (use Graph 3.0, page 87 or equation (4) page 82)...dimensionless... Fl Back pressure correction facr for balanced bellows spring loaded valves (WB 100) liquid duty only, (use Graph 4.0, page 88)...dimensionless... Fn High temperature steam correction facr. Fp Subsonic flow facr for low set pressure on gas duty only, (use Graph 5.0, page 88)...dimensionless... Fsh Correction facr for superheated steam (Table 4, page 89)...dimensionless... Fv Liquid viscosity correction facr (Page 82, Graph 1.0)...dimensionless... G Specific gravity...dimensionless... Kc Derating facr = 0.9 for use with bursting discs; if no bursting disc use 1.0...dimensionless... Kd Certified ASME Code Section VIII discharge coefficient: WB100 / 200 = 0.653 (actual) (actuals are used on WB 300 / 400 = 0.975 (actual) WB valves, as the WB 300B = 0.925 (actual) derating facr has B Series = 0.857 (derated) been applied the C Series = 0.509 (derated) the orifice area). 6D Series (gas/steam) = 0.811 (derated) 6D Series (liquid) = 0.670 (derated) 7D Series (gas/steam) = 0.824 (derated) 7D Series (liquid) = 0.506 (derated) Pilots: Types 2, 4, 8 = 0.849 gases (derated) Pilots: Types 4, 8 = 0.696 liquids (derated) For full bore 8" x 10" x 10" pilot valves refer page 96...dimensionless... k Isentropic exponent (ratio of specific heats)...dimensionless... M Molecular weight...kg/kmole... P Set pressure + overpressure + atmospheric pressure where:- Overpressure = 10% or 3 Psi whichever is the greater Psia Atmospheric pressure = 14.7 Psia Pg Set pressure + Overpressure Psig Pb Back pressure at safety valve outlet Psia Pbg Back pressure at safety valve outlet Psig Q Volumetric flow rate @ 14.7 Psia and 60 ºF SCFM R Reynolds number...dimensionless... T Temperature at valve inlet deg.r = 460 + ºF deg.rankine VL Liquid flow rate us gpm W Mass flow rate lb/h w Liquid density lb/cu ft Z Compressibility facr (if unknown use 1.0)...dimensionless... 83

BACKPRESSURE AND BLOWDOWN LIMITS Figures shown are expressed as a percentage of set pressure. Valve type Built up Superimposed Constant Blowdown back variable back superimposed % pressure % pressure % back pressure % Safeset Pilot operated safety valves Refer page 69 Conventional spring loaded safety valves WB 200 10 3 80 10 15 WB 400 10 3 80 7 B 10 3 80 10 C 10 3 80 10 15 D 10 3 80 15 20 Balanced bellows spring loaded safety valves WB 100 50 50 50 10 15 WB 300 20 20 20 7 WB 300B 70 70 70 7 7D (pisn) Gas 70 70 70 15-20 7D (pisn) Liq. 50 50 50 15-20 ORIFICE AREAS Orifice WB Series Safeset Pilot letter in 2 mm 2 in 2 mm 2 D 0.110 71 0.164 106 E 0.196 127 0.256 165 F 0.307 198 0.338 218 G 0.503 325 0.616 397 H 0.785 506 0.871 562 J 1.287 830 1.427 921 K 1.838 1185 2.139 1380 L 2.853 1840 3.167 2043 M 3.600 2320 4.307 2779 N 4.340 2800 5.162 3330 P 6.380 4120 7.068 4560 Q 11.050 7130 12.864 8299 R 16.000 10300 17.758 11456 S 22.118 14270 T 26.000 16770 28.860 18619 X 44.178 28302 WB Series Spring Loaded SRV WB100 / 200/ 300 / 300B & 400 The actual orifice area is 11% larger than those shown in this table. This ensures that after derating the discharge coefficient in accordance with industry standards, the full benefits of the API 526 orifice area can still be obtained. It is important use the actual coefficient of discharge as the areas are already derated. Safeset Pilot Operated SRV The areas shown in the table are actual orifice areas of the main valves and are larger than the standard API 526 dimensions. This ensures that after derating the discharge coefficient in accordance with industry standards, the full benefits of the API 526 orifice area can still be obtained. It is important use the derated coefficient of discharge as the areas are actuals. Orifice no. Safeflo in 2 mm 2 1 0.062 40 2 0.110 71 3 0.196 127 4 0.442 285 6 0.070 45 7 0.169 109 Safeflo Spring Loaded Types The orifice areas shown in the table are in accordance with industry standards. API 526 does not specify requirements for thermal relief valves. It is important use the derated coefficient of discharge as the areas are actuals. 84

Table 2 Representative data on some vapours and gases useful in sizing safety relief valves Gas or Vapour k C C M M G* G imperial metric Acetaldehyde 1.14 331 2.51 44 6.633 1.519 1.232 Acetic Acid 1.15 332 2.52 60 7.746 2.071 1.439 Acetylene 1.26 343 2.61 26.04 5.103 0.899 0.948 Air 1.40 356 2.70 28.97 5.382 1 1 Ammonia 1.31 348 2.64 17.03 4.127 0.587 0.766 Argon 1.67 377.5 2.87 40 6.325 1.381 1.175 Benzene 1.12 329 2.50 78.11 8.838 2.70 1.643 Butadiene 1.3 1.12 329 2.50 54.09 7.355 1.922 1.386 n-butane 1.09 325 2.47 58.12 7.63 2.07 1.439 Iso-Butane 1.1 327 2.49 58.12 7.63 2.07 1.439 i-butane 1.11 327 2.49 56.10 7.49 1.937 1.392 Iso-Butylene 1.12 329 2.49 56.10 7.49 1.998 1.413 Carbon Dioxide 1.29 346 2.68 44.01 6.634 1.53 1.237 Carbon Disulphate 1.21 338 2.57 76.13 8.726 2.628 1.621 Carbon Monoxide 1.40 356 2.70 28.00 5.292 0.967 0.983 Chloride 1.36 353 2.68 70.91 8.421 2.45 1.565 Cyclohexane 1.09 325 2.47 84.16 9.174 2.905 1.705 Decane 1.03 319 2.42 142 11.92 4.91 2.216 Dowthern A 1.043 320 2.43 165 12.85 5.696 2.386 Dowthern E 147 12.12 5.074 2.253 Ethane 1.19 336 2.55 30.07 5.483 1.05 1.025 Ethene (Ethylene) 1.24 341 2.59 28.05 5.297 0.977 0.988 Ethyl Alcohol 1.13 330 2.50 46.07 6.787 1.59 1.261 Ethyl Benzine 1.07 323 2.46 106.16 10.31 3.67 1.916 Ethyl Chloride 1.19 336 2.55 64.50 8.031 2.226 1.492 Freon 11 1.14 331 2.51 137.37 11.72 4.742 2.177 Freon 12 1.14 331 2.51 120.92 10.995 4.174 2.043 Freon 22 1.18 335 2.55 86.48 9.299 2.985 1.727 Freon 114 1.09 325 2.47 170.93 13.073 5.90 2.429 Helium 1.66 377 2.86 4 2 0.138 0.3716 n-heptane 1.05 321 2.44 100 10 3.49 1.868 n-hexane 1.06 322 2.45 86.17 9.283 2.97 1.723 Hydrogen Chloride 1.41 357 2.71 36.47 6.039 1.27 1.127 Hydrogen 1.41 357 2.71 2.02 1.421 0.070 0.265 Hydrogen Sulphide 1.32 349 2.65 34.08 5.838 1.19 1.091 Methane 1.31 348 2.64 16.04 4.005 0.555 0.745 Menthyl Alcochol 1.20 337 2.56 32 5.657 1.11 1.054 Menthyl Butane 1.08 324 2.46 72.15 8.494 2.49 1.578 Methyl Chloride 1.20 337 2.56 50.48 7.105 1.742 1.320 Natural Gas 1.27 344 2.61 19 4.359 0.656 0.8099 Nitric Oxide 1.40 356 2.70 30 5.477 1.036 1.018 Nitrogen 1.40 356 2.70 28.02 5.294 0.967 0.9834 Nitrous Oxide 1.30 347 2.63 44 6.633 1.519 1.233 Nonane 1.04 320 2.43 128 11.31 4.43 2.105 n-octane 1.05 321 2.44 114.22 10.687 3.94 1.985 Oxygen 1.40 356 2.70 32 5.657 1.10 1.0490 n-pentane 1.07 323 2.46 72.15 8.494 2.49 1.578 Phenol 1.30 347 2.63 94 9.695 3.27 1.808 Propane 1.13 330 2.50 44.09 6.64 1.55 1.245 Propylene 1.15 332 2.52 42.08 6.487 1.476 1.214 Sulphur Dioxide 1.29 346 2.63 64.06 8.004 2.26 1.503 Steam 1.33 349 2.66 18 4.243 0.622 0.7887 Styrene 1.07 323 2.46 104.14 10.21 3.60 1.897 Toluene 1.09 325 2.47 92 9.592 3.18 1.783 *Air = 1.0 at 14.7 Psia and 60ºF. 85

Table 3 Representative data on liquids useful in sizing safety valves Liquid G** G Acetic Acid 1.05 1.025 Acene 0.792 0.890 Ammonia 0.617 0.786 Benzene 0.885 0.941 1, 2 Butadiene 0.658 0.811 1, 3 Butadiene 0.627 0.792 Iso-Butane 0.563 0.750 n-butane 0.584 0.764 j-butane 0.601 0.775 Carbon Dioxide 0.816 0.903 Carbon Disulphide 1.26 1.122 Chlorine 1.423 1.93 Dowtherm A at 212ºF 0.997 0.999 Dowtherm E at 212ºF 1.181 1.086 Ethane 0.377 0.614 Ethyl Alcohol 0.794 0.891 Ethyl Benene 0.872 0.934 Fuel Oil, Bunker C 1.014 (max.) 1.007 Fuel Oil, No. 3 (60ºF) 0.898 (max.) 0.948 Fuel Oil, No. 5 (60ºF) 0.993 (max.) 0.997 Fuel Oil, No. 6 (60ºF) 0.993 (min.) 0.997 Petrol (Gasoline) 0.75 0.886 Liquid G** G n-heptane 0.688 0.830 n-hexane 0.664 0.815 Hydrochloric Acid (40%) 1.20 1.095 Kerosene 0.82 0.906 Methane 0.248 0.498 Methyl Alcohol (100%) 0.796 0.892 Methyl Butane 0.625 0.791 Naphtha 0.88 0.938 Nitric Acid (91%) 1.50 1.225 Nitrogen 0.804 0.897 Iso-Octane 0.696 0.834 n-octane 0.707 0.841 Oils, Minerals and Lubricants 0.910 0.954 Iso-Pentane 0.625 0.791 n-pentane 0.631 0.794 Phosphoric Acid 1.88 1.371 Propane 0.508 0.713 Polythene 0.522 0.723 Styrene 0.911 0.955 Sulphuric Acid (87%) 1.80 1.342 Water 1.00 1.00 **Water = 1.0 at 70ºF. 86

Graph 2.0 Facr Ff For application sizing and capacity determination of balanced bellows safety relief valves against variable and constant back pressure vapours and gases only. Graph 3.0 Use the curve evaluate back pressure correction facr Fb, for pilot valves and for conventional valves with constant back pressure use. 87

Graph 4.0 Facr Fl For application sizing and capacity determination of balanced bellows safety relief valves against variable or constant back pressure liquids only (10% overpressure). Graph 5.0 Facr Fp For low set pressure vapours and gases only. 88

Table 4 Superheated Steam Correction Facrs FSH For capacity on superheated steam, multiply saturated steam capacity by correction facr below Set Pressure Saturated Total Steam Temperature in Degrees Fahrenheit p.s.i. steam gauge Temp. F 300 400 500 600 700 800 900 1000 1100 1200 15 250 1.00 0.98 0.93 0.88 0.84 0.80 0.77 0.74 0.72 0.70 20 259 1.00 0.98 0.93 0.88 0.84 0.80 0.77 0.74 0.72 0.70 40 287 1.00 0.99 0.93 0.88 0.84 0.81 0.77 0.74 0.72 0.70 60 308 1.00 0.99 0.93 0.88 0.84 0.81 0.77 0.75 0.72 0.70 80 324 1.00 0.99 0.93 0.88 0.84 0.81 0.77 0.75 0.72 0.70 100 338 1.00 0.99 0.94 0.89 0.84 0.81 0.77 0.75 0.72 0.70 120 350 1.00 0.99 0.94 0.89 0.84 0.81 0.78 0.75 0.72 0.70 140 361 1.00 0.99 0.94 0.89 0.85 0.81 0.78 0.75 0.72 0.70 160 371 1.00 0.99 0.94 0.89 0.85 0.81 0.78 0.75 0.72 0.70 180 380 1.00 0.99 0.94 0.89 0.85 0.81 0.78 0.75 0.72 0.70 200 388 1.00 0.99 0.95 0.89 0.85 0.81 0.78 0.75 0.72 0.70 220 395 1.00 0.99 0.95 0.89 0.85 0.81 0.78 0.75 0.72 0.70 240 403-1.00 0.95 0.90 0.85 0.81 0.78 0.75 0.72 0.70 260 409-1.00 0.95 0.90 0.85 0.81 0.78 0.75 0.72 0.70 280 416-1.00 0.96 0.90 0.85 0.81 0.78 0.75 0.72 0.70 300 422-1.00 0.96 0.90 0.85 0.81 0.78 0.75 0.72 0.70 350 436-1.00 0.96 0.90 0.86 0.82 0.78 0.75 0.72 0.70 400 448-1.00 0.96 0.91 0.86 0.82 0.78 0.75 0.72 0.70 500 470-1.00 0.96 0.92 0.86 0.82 0.78 0.75 0.73 0.70 600 489-1.00 0.97 0.92 0.87 0.82 0.79 0.75 0.73 0.70 800 520 - - 1.00 0.95 0.88 0.83 0.79 0.76 0.73 0.70 1000 546 - - 1.00 0.96 0.89 0.84 0.78 0.76 0.73 0.71 1250 574 - - 1.00 0.97 0.91 0.85 0.80 0.77 0.74 0.71 1500 597 - - - 1.00 0.93 0.86 0.81 0.77 0.74 0.71 1750 618 - - - 1.00 0.94 0.86 0.81 0.77 0.73 0.70 2000 636 - - - 1.00 0.95 0.86 0.80 0.76 0.72 0.69 2500 670 - - - 1.00 0.95 0.85 0.78 0.73 0.69 0.66 3000 690 - - - - 1.00 0.82 0.74 0.69 0.65 0.62 89

Pressure Protection 90

WATER CAPACITY CHART WB 100/200 Water Capacity U.S.G.P.M. 10% over pressure or 3 Psig minimum ORIFICE SIZE LETTER DESIGNATION Set Psig Gauge D E F G H J K L M N P Q R T 10 10 18 28 45 70 115 164 255 322 388 571 989 1431 2326 20 13 23 37 60 93 153 219 340 428 516 759 1315 1904 3094 30 16 28 44 72 112 183 262 407 513 619 909 1575 2281 3706 40 18 32 51 83 129 212 303 470 593 714 1050 1819 2634 4280 50 20 36 56 93 144 237 338 525 662 799 1174 2033 2944 4785 60 22 40 62 101 158 259 371 575 726 875 1286 2228 3225 5241 70 24 43 67 110 171 280 400 621 784 945 1389 2406 3484 5661 80 26 46 71 117 183 300 428 664 838 1010 1485 2572 3724 6052 90 27 48 76 124 194 318 454 704 889 1072 1575 2728 3850 6419 100 29 51 80 131 204 335 478 742 937 1129 1660 2876 4164 6767 120 31 56 88 143 224 367 524 813 1026 1237 1819 3150 4561 7412 140 34 60 95 155 242 396 566 879 1109 1336 1965 3403 4927 8006 160 36 65 101 166 258 424 605 939 1185 1429 2100 3638 5267 8559 180 38 68 107 176 274 449 642 996 1257 1515 2228 3858 5587 9078 200 40 72 113 185 289 474 676 1050 1325 1597 2348 4067 5889 9569 220 42 76 119 194 303 497 709 1101 1390 1675 2463 4265 6176 10036 240 44 79 124 203 316 519 741 1150 1451 1750 2572 4455 6451 10483 260 46 82 129 211 329 540 771 1197 1511 1821 2677 4637 6714 10911 280 48 85 134 219 342 560 800 1242 1568 1890 2778 4812 6968 11323 300 50 88 138 227 354 580 829 1286 1623 1956 2876 4981 7212 11720 320 51 91 143 234 365 599 856 1328 1676 2020 2970 5144 340 53 94 147 241 377 618 882 1369 1728 2083 3062 5303 360 54 97 152 248 388 636 908 1409 1778 2143 3150 5456 380 56 99 156 255 398 653 932 1447 1826 2202 3237 5606 400 57 102 160 262 409 670 957 1485 1874 2259 3321 5752 420 59 105 164 268 419 686 980 1522 1920 2315 3403 5894 440 60 107 168 275 429 703 1003 1557 1965 2369 3483 6032 460 61 109 171 281 438 718 1026 1592 2009 2422 3561 6168 480 63 112 175 287 448 734 1048 1627 2053 2475 3638 6301 500 64 114 179 293 457 749 1070 1660 2095 2526 3713 6430 520 65 116 182 299 466 764 1091 1693 2136 2576 3786 6558 540 67 119 186 304 475 778 1112 1725 2177 2625 3858 6683 560 68 121 189 310 483 793 1132 1757 2217 2673 3929 6805 580 69 123 192 315 492 807 1152 1788 2256 2720 3999 6926 600 70 125 196 321 500 820 1172 1819 2295 2767 4067 7044 620 71 127 199 326 509 834 1191 1849 2333 2812 4134 640 72 129 202 331 517 847 1210 1878 2370 2857 4201 660 74 131 205 336 525 860 1229 1908 2407 2902 4266 680 75 133 208 341 533 873 1247 1936 2443 2945 4330 700 76 135 211 346 541 886 1266 1964 2479 2988 4393 720 77 137 214 351 548 899 1284 1992 2514 3031 4455 740 78 139 217 356 556 911 1301 2020 2549 3073 4517 760 79 141 220 361 563 923 1319 2047 2583 3114 4577 780 80 142 223 366 571 935 1336 2074 2617 3154 4637 800 81 144 226 370 578 947 1353 2100 2650 3195 4696 850 83 149 233 382 596 977 1395 2165 2732 3293 4841 900 86 153 240 393 613 1005 1435 2227 2811 3388 4981 950 88 157 246 403 630 1032 1474 2289 2888 3481 5118 1000 91 161 253 414 646 1059 1513 2348 2963 3572 5251 1100 95 169 265 434 678 1111 1586 2463 3107 1300 103 184 288 472 737 1208 1725 2677 1500 111 198 309 507 791 1297 1853 2876 1750 120 213 334 548 855 1401 2001 2000 128 228 357 585 914 1498 2139 2250 136 242 379 621 969 1589 2500 143 255 399 655 1021 1675 2750 150 267 419 686 1071 3000 157 279 438 717 3250 163 291 455 746 3500 169 302 473 774 3750 175 312 489 4000 181 323 505 4250 187 333 521 4500 192 342 536 4750 197 352 551 5000 202 361 565 5250 207 370 5500 212 378 5750 217 387 6000 222 395 Note: This chart should be used as a guideline only. 91

SATURATED STEAM CAPACITY CHART WB 400 Saturated Steam Capacities lb/hr 10% over pressure or 3 Psig minimum ORIFICE SIZE LETTER DESIGNATION Set Psig Gauge D E F G H J K L M N P Q R T 10 142 252 395 648 1011 1658 2367 3675 4637 5590 8217 14232 20607 33487 20 208 371 581 952 1486 2436 3479 5401 6815 8216 12077 20918 30288 49218 30 263 469 735 1205 1880 3083 4402 6833 8622 10395 15281 26466 38322 62274 40 324 578 905 1483 2314 3793 5417 8409 10611 12792 18805 32570 47160 76634 50 385 686 1074 1760 2747 4504 6433 9985 12599 15189 22329 38673 55997 90995 60 446 794 1244 2038 3181 5215 7448 11561 14588 17586 25853 44776 64834 105356 70 506 902 1414 2316 3615 5926 8463 13137 16576 19983 29377 50880 73672 119717 80 567 1011 1583 2594 4048 6637 9478 14712 18565 22381 32901 56983 82509 134077 90 628 1119 1753 2872 4482 7348 10493 16288 20553 24778 36242 63086 91347 148438 100 689 1227 1922 3150 4915 8059 11509 17864 22541 27175 39948 69190 100184 162799 120 810 1444 2261 3705 5782 9480 13539 21016 26518 31969 46996 81396 117859 191521 140 932 1660 2601 4261 6650 10902 15569 24167 30495 36763 54044 93603 135534 220242 160 1053 1877 2940 4816 7517 12324 17600 27319 34472 41558 61092 105810 153208 248964 180 1175 2093 3279 5372 8384 13745 19630 30471 38449 46352 68140 118016 170883 277685 200 1296 2310 3618 5928 9251 15167 21661 33622 42426 51146 75185 130223 188558 306407 220 1418 2526 3957 6483 10118 16589 23691 36774 46402 55941 82235 142430 206233 335128 240 1539 2743 4296 7039 10985 18011 25721 39926 50379 60735 89283 154636 223908 363850 260 1661 2959 4635 7595 11853 19432 27752 43077 54356 65529 96331 166843 241582 392571 280 1782 3176 4974 8150 12720 20854 29782 46229 58333 70324 103379 179049 259257 421193 300 1940 3392 5314 8706 13587 22276 31813 49380 62310 75118 110427 191256 276932 450014 320 2025 3609 5653 9262 14454 23697 33843 52532 66287 79912 117474 203463 340 2147 3825 5992 9817 15321 25119 35873 55684 70263 84706 124522 215669 360 2268 4042 6331 10373 16188 26541 37904 58835 74240 89501 131570 227876 380 2390 4258 6670 10929 17056 27963 39934 61987 78217 94295 138618 240083 400 2511 4475 7009 11484 17923 29384 41965 65139 82194 99089 145666 252289 420 2633 4692 7348 12040 18790 30806 43995 68290 86171 103884 152714 264496 440 2755 4908 7688 12596 19657 32228 46025 71442 90148 108678 159761 276703 460 2876 5125 8027 13151 20524 33649 48056 74594 94124 113472 166809 288909 480 2998 5341 8366 13707 21392 35071 50086 77745 98101 118266 173857 301116 500 3119 5558 8705 14263 22259 36493 52116 80897 102078 123061 180905 313323 520 3241 5774 9044 14818 23126 37915 54147 84048 106055 127855 187953 325529 540 3362 5991 9383 15374 23993 39336 56177 87200 110032 132649 195001 337736 560 3484 6207 9722 15930 24860 40758 58208 90352 114008 137444 202048 349943 580 3605 6424 10062 16485 25727 42180 60238 93503 117985 142238 209096 362149 600 3727 6640 10401 17041 26595 43601 62268 96655 121962 147032 216144 374356 620 3848 6857 10740 17596 27462 45023 64299 99807 125939 151826 223192 640 3970 7073 11079 18152 28329 46445 66329 102958 129916 156621 230240 660 4091 7290 11418 18708 29196 47867 68360 106110 133893 161415 237288 680 4213 7506 11757 19263 30063 49288 70390 109262 137869 166209 244335 700 4334 7723 12096 19819 30930 50710 72420 112413 141846 171004 251383 720 4456 7939 12435 20375 31798 52132 74451 115565 145823 175798 258431 740 4577 8156 12775 20930 32665 53553 76481 118716 149800 180592 265479 760 4699 8372 13114 21486 33532 54975 78512 121868 153777 185386 272527 780 4820 8589 13453 22042 34399 56397 80542 125020 157754 190181 279574 800 4942 8805 13792 22597 35266 57819 82572 128171 161730 194975 286622 850 5246 9347 14640 23986 37434 61373 87648 136050 171673 206961 304242 900 5549 9888 15488 25376 39602 64927 92724 143930 181615 218946 321861 950 5853 10429 16336 26765 41770 68482 97800 151809 191557 230932 339481 1000 6157 10970 17183 28154 43938 72036 102876 159688 201499 242918 357101 1100 6764 12053 18879 30932 48274 79144 113028 175446 221383 1300 7980 14218 22270 36489 56945 93362 133332 206962 1500 9155 16313 25551 41863 65334 107114 152972 237448 1750 10820 19279 30198 49477 77216 126594 180793 2000 12561 22382 35058 57440 89643 146969 209891 2250 14403 25664 40199 65863 102788 168520 240668 2500 16381 29189 45719 74907 116903 191662 2750 18549 33052 51770 84821 132375 217028 2900 19976 35593 55751 91344 Note: This chart should be used as a guideline only. 92

AIR CAPACITY CHART WB 400 Air Capacity s.c.f.m. 10% over pressure or 3 Psig minimum ORIFICE SIZE LETTER DESIGNATION Set Psig Gauge D E F G H J K L M N P Q R T 10 50 89 140 229 357 586 836 1298 1638 1975 2903 5028 7280 11830 20 74 131 205 336 525 861 1229 1908 2408 2902 4267 7390 10700 17388 30 94 167 262 429 670 1098 1568 2434 3071 3703 5443 9427 13650 22181 40 115 206 322 528 824 1351 1930 2995 3779 4556 6698 11601 16798 27296 50 137 244 383 627 979 1604 2291 3557 4488 5410 7953 13775 19945 32411 60 159 283 443 726 1133 1858 2653 4118 5196 6264 9208 15949 23093 37526 70 180 321 503 825 1287 2111 3014 4679 5904 7118 10464 18123 26241 42642 80 202 360 564 924 1442 2364 3376 5240 6612 7972 11719 20297 29389 47757 90 224 399 624 1023 1596 2617 3738 5802 7321 8826 12974 22471 32537 52872 100 245 437 685 1122 1751 2870 4099 6363 8029 9679 14229 24644 35684 57987 120 289 514 805 1320 2060 3377 4822 7486 9445 11387 16739 28992 41980 68217 140 332 591 926 1518 2369 3883 5546 8608 10862 13095 19250 33340 48275 78448 160 375 668 1047 1716 2677 4390 6269 9731 12278 14802 21760 37688 54571 88678 180 418 746 1168 1913 2986 4896 6992 10853 13695 16510 24271 42036 60866 98908 200 462 823 1289 2111 3295 5402 7715 11976 15111 18218 26781 46384 67162 109138 220 505 900 1409 2309 3604 5909 8438 13098 16528 19925 29291 50732 73458 119369 240 548 977 1530 2507 3913 6415 9162 14221 17944 21633 31802 55080 79753 129599 260 592 1054 1651 2705 4222 6922 9885 15344 19361 23341 34312 59427 86049 139829 280 635 1131 1772 2903 4531 7428 10608 16466 20777 25048 36822 63775 92344 150059 300 678 1208 1893 3101 4840 7934 11331 17589 22194 26756 39333 68123 98640 160290 320 721 1285 2013 3299 5148 8441 12054 18711 23610 28464 41843 72471 340 765 1363 2134 3497 5457 8947 12778 19834 25027 30171 44353 76819 360 808 1440 2255 3695 5766 9454 13501 20956 26443 31879 46664 81167 380 851 1517 2376 3893 6075 9960 14224 22079 27860 33587 49374 85515 400 895 1594 2497 4091 6384 10466 14947 23202 29276 35294 51884 89862 420 938 1671 2617 4288 6693 10973 15670 24324 30693 37002 54395 94210 440 981 1748 2738 4486 7002 11479 16394 25447 32109 38710 56905 98558 460 1024 1825 2859 4684 7311 11986 17117 26569 33526 40417 59415 102906 480 1068 1902 2980 4882 7619 12492 17840 27692 34942 42125 61926 107254 500 1111 1980 3101 5080 7928 12998 18563 28814 36359 43833 64436 111602 520 1154 2057 3221 5278 8237 13505 19286 29937 37775 45540 66946 115950 540 1198 2134 3342 5476 8546 14011 20010 31060 39192 47248 69457 120297 560 1241 2211 3463 5674 8855 14518 20733 32182 40608 48956 71967 124645 580 1284 2288 3584 5872 9164 15024 21456 33305 42025 50663 74478 128993 600 1327 2365 3705 6070 9473 15530 22179 34427 43441 52371 76988 133341 620 1371 2442 3825 6268 9782 16037 22902 35550 44858 54079 79498 640 1414 2519 3946 6466 10090 16543 23626 36672 46274 55786 82009 660 1457 2597 4067 6663 10399 17050 24349 37795 47691 57494 84519 680 1501 2674 4188 6861 10708 17556 25072 38918 49107 59202 97029 700 1544 2751 4309 7059 11017 18062 25795 40040 50524 60909 89540 720 1587 2828 4429 7257 11326 18569 26518 41163 51940 62617 92050 740 1630 2905 4550 7455 11635 19075 27242 42285 53357 64325 94560 760 1674 2982 4671 7653 11944 19581 27965 43408 54773 66032 97071 780 1717 3059 4792 7851 12253 20088 28688 44530 56190 67740 99581 800 1760 3136 4913 8049 12561 20594 29411 45653 57606 69448 102091 850 1868 3329 5215 8544 13334 21860 31219 48460 61148 73717 108367 900 1977 3522 5517 9038 14106 23126 33027 51266 64689 77986 114643 950 2085 3715 5819 9533 14878 24392 34835 54072 68230 82255 120919 1000 2193 3908 6121 10028 15650 25658 36643 56879 71771 86524 127195 1100 2409 4293 6724 11018 17195 28190 40259 62492 78854 1300 2842 5064 7932 12997 20283 33254 47491 73717 1500 3275 5836 9140 14976 23372 38318 54723 84943 1750 3816 6800 10650 17450 27233 44648 63763 2000 4357 7764 12160 19924 31094 50978 72803 2250 4898 8728 13670 22398 34955 57308 81843 2500 5439 9692 15180 24872 38816 63638 2750 5980 10656 16690 27346 42677 69968 3000 6521 11620 18200 29820 3250 7062 12584 19710 32294 3500 7603 13548 21220 34768 3750 8144 14512 22730 4000 8685 15476 24240 4250 9226 16440 25750 4500 9767 17404 27260 4750 10308 18368 28770 5000 10849 19332 30280 5250 11390 20296 5500 11931 21260 5750 12472 22224 6000 13013 23188 Note: This chart should be used as a guideline only. 93

AIR CAPACITY CHART Pilot:Types 2, 4 & 8 Main Valve Discharge Capacities s.c.f.m. 10% over pressure or 3 Psig whichever is the greater. Kd = 0.849 * ORIFICE SIZE LETTER DESIGNATION (DISCHARGE AREA sq in) Set Psig D E F G H J K L M N P Q R S T Gauge (0.164) (0.256) (0.338) (0.616) (0.871) (1.429) (2.139) (3.166) (4.307) (5.162) (7.068) (12.864) (17.758) (22.118) (28.862) 29 119 186 246 448 634 1039 1556 2303 3133 3755 5141 9357 12917 16088 20994 40 150 234 309 563 796 1307 1956 2895 3938 4720 6462 11762 16236 20223 26387 60 206 322 425 774 1095 1796 2689 3980 5414 6488 8884 16170 22321 27802 36276 80 262 410 541 985 1393 2286 3422 5064 6890 8257 11306 20578 28406 35381 46166 100 319 497 657 1196 1692 2776 4155 6149 8366 10026 13728 24986 34492 42960 56055 150 459 717 946 1724 2438 4000 5987 8862 12055 14448 19783 36006 49704 61908 80779 200 600 936 1236 2252 3184 5224 7819 11574 15745 18871 25838 47026 64917 80856 105502 250 740 1155 1525 2780 3930 6448 9652 14286 19435 23293 31893 58047 80130 99804 130226 300 881 1374 1815 3307 4676 7672 11484 16998 23124 27715 37948 69067 95343 118752 154949 350 1021 1594 2104 3835 5423 8896 13317 19710 26814 32137 44003 80087 110556 137700 179673 400 1162 1813 2394 4363 6169 10121 15149 22423 30504 36559 50058 91107 125768 156647 204397 450 1302 2032 2683 4890 6915 11345 16982 25135 34193 40981 56113 102128 140981 175595 229120 500 1442 2252 2973 5418 7661 12569 18814 27847 37883 45403 62168 113148 156194 194543 253844 550 1583 2471 3263 5946 8407 13793 20646 30559 41573 49826 68223 124168 171407 213491 278567 600 1723 2690 3552 6474 9153 15017 22479 33272 45262 54248 74278 135188 186620 232439 303291 650 1864 2910 3842 7001 9900 16242 24311 35984 48952 58670 80333 146209 201832 251387 328015 700 2004 3129 4131 7529 10646 17466 26144 38696 52642 63092 86388 157229 217045 270335 352738 750 2145 3348 4421 8057 11392 18690 27976 41408 56332 67514 92443 168249 232258 289283 377462 800 2285 3568 4710 8584 12138 19914 29809 44121 60021 71936 98498 179269 247471 308231 402185 850 2426 3787 5000 9112 12884 21138 31641 46833 63711 76358 104553 190290 262684 327179 426909 900 2566 4006 5289 9640 13630 22363 33473 49545 67401 80781 110608 201310 277896 346126 451633 950 2707 4225 5579 10168 14377 23587 35306 52257 71090 85203 116663 212330 293109 365074 476356 1000 2847 4445 5869 10695 15123 24811 37138 54969 74780 89625 122718 223350 308322 384022 501080 1200 3409 5322 7027 12806 18107 29708 44468 65818 89539 107313 146938 267431 369173 459814 599974 1400 3971 6199 8185 14917 21092 34604 51798 76667 104298 125002 171157 311512 430024 535605 698868 1480 4196 6550 8648 15761 22286 36563 54730 81007 110201 132077 180845 329145 454365 565922 738426 1600 4533 7076 9343 17028 24077 39501 59127 87516 119056 142691 195377 355593 490876 1800 5095 7954 10501 19139 27061 44398 66457 98365 133815 160379 219597 399674 551727 2000 5657 8831 11660 21249 30046 49295 73787 109214 148574 178068 243817 443755 612578 2200 6219 9708 12818 23360 33031 54191 81116 120063 163333 195756 268037 487836 673429 2400 6781 10585 13976 25471 36015 59088 88446 130912 178091 213445 292257 531917 734281 2600 7343 11463 15134 27582 39000 63985 95776 141761 192850 231134 316477 575998 795132 2800 7905 12340 16293 29693 41985 68882 103106 152610 207609 248822 340696 620079 855983 3000 8467 13217 17451 31804 44969 73778 110435 163459 222368 266511 364916 664160 916834 3500 9872 15410 20346 37081 52431 86020 128759 190581 259265 310732 425466 774363 1068962 3705 10448 16309 21533 39244 55490 91039 136272 201701 274392 328863 450291 819546 1131335 4000 11277 17603 23242 42358 59892 98262 4350 12261 19138 25269 46052 65116 106831 4500 12682 19796 26137 47635 67354 110504 5000 14087 21989 29033 52912 74816 122746 5500 15492 24183 31929 58189 82277 134988 6000 16897 26376 34824 63466 89739 147230 6170 17375 27121 35809 65261 92276 151392 *Note: Type 4 Pilot is available 1480 Psig. Type 8 Pilot is available from 1480 Psig. For 8" x 10" x 10" full bore capacity chart see page 96. 94

WATER CAPACITY CHART - U.S.G.P.M. Pilot:Types 4 and 8 Main Valve Discharge Capacities Water u.s.g.p.m. 10% over pressure or 3 Psig whichever is the greater. Kd = 0.696 * ORIFICE SIZE LETTER DESIGNATION (DISCHARGE AREA sq in) Set Psig D E F G H J K L M N P Q R S T Gauge (0.164) (0.256) (0.338) (0.616) (0.871) (1.429) (2.139) (3.166) (4.307) (5.162) (7.068) (12.864) (17.758) (22.118) (28.862) 29 25 38 51 92 130 214 320 473 644 771 1056 1922 2654 3305 4313 40 29 45 59 108 153 251 375 555 756 906 1240 2257 3115 3880 5063 60 35 55 73 132 187 307 460 680 925 1109 1519 2764 3816 4752 6201 80 41 64 84 153 216 355 531 785 1069 1281 1754 3192 4406 5488 7161 100 45 71 94 171 242 396 593 878 1195 1432 1961 3568 4926 6135 8006 150 56 87 115 209 296 485 727 1076 1463 1754 2401 4370 6033 7514 9805 200 64 100 133 242 342 561 839 1242 1690 2025 2773 5046 6966 8677 11322 250 72 112 148 270 382 627 938 1389 1889 2264 3100 5642 7788 9701 12659 300 79 123 162 296 418 687 1028 1521 2069 2480 3396 6181 8532 10627 13867 350 85 133 175 320 452 742 1110 1643 2235 2679 3668 6676 9215 11478 14978 400 91 142 188 342 483 793 1187 1756 2389 2864 3921 7137 9852 12271 16012 450 97 151 199 362 513 841 1259 1863 2534 3037 4159 7570 10449 13015 16983 500 102 159 210 382 540 886 1327 1964 2671 3202 4384 7979 11015 13719 17902 550 107 167 220 401 567 930 1391 2060 2802 3358 4598 8368 11552 14389 18776 600 111 174 230 419 592 971 1453 2151 2926 3507 4802 8741 12066 15028 19611 650 116 181 239 436 616 1011 1513 2239 3046 3651 4999 9097 12559 15642 20411 700 120 188 248 452 639 1049 1570 2324 3161 3788 5187 9441 13033 16232 21182 750 125 194 257 468 662 1086 1625 2405 3272 3921 5369 9772 13490 16802 21925 800 129 201 265 483 683 1121 1678 2484 3379 4050 5545 10093 13932 17353 22644 850 133 207 273 498 704 1156 1730 2560 3483 4175 5716 10403 14361 17887 23341 900 136 213 281 513 725 1189 1780 2635 3584 4296 5882 10705 14778 18406 24018 950 140 219 289 527 745 1222 1829 2707 3682 4413 6043 10998 15183 18910 24676 1000 144 225 269 540 764 1253 1876 2777 3778 4528 6200 11284 15577 19401 25317 1200 158 246 325 592 837 1373 2055 3042 4139 4960 6792 12361 17064 21253 27734 1400 170 266 351 639 904 1483 2220 3286 4470 5358 7336 13351 18431 22956 29956 1480 175 273 361 657 929 1525 2283 3379 4596 5509 7543 13728 18950 23603 30800 1600 182 284 375 683 966 1586 2373 3513 4779 5728 7842 14273 19703 1800 193 301 398 725 1025 1682 2517 3726 5069 6075 8318 15139 20899 2000 203 318 419 764 1080 1773 2653 3927 5343 6404 8768 15958 22029 2200 213 333 440 801 1133 1859 2783 4119 5604 6716 9196 16737 23104 2400 223 348 459 837 1184 1942 2907 4302 5853 7015 9605 17481 24132 2600 232 362 478 871 1232 2021 3025 4478 6092 7301 9997 18195 25117 2800 241 376 496 904 1278 2097 3140 4647 6322 7577 10374 18882 26065 3000 249 389 514 936 1323 2171 3250 4810 6544 7843 10739 19545 26980 3500 269 420 555 1011 1429 2345 3510 5196 7068 8471 11599 21111 29142 3705 277 432 571 1040 1471 2413 3612 5346 7272 8716 11934 21720 29983 4000 288 449 593 1081 1528 2507 4350 300 468 618 1127 1593 2614 6170 357 558 736 1342 1898 3114 *Note: Type 4 Pilot is available 1480 Psig. Type 8 Pilot is available from 1480 Psig. For 8" x 10" x 10" full bore capacity chart see page 96. 95

DUAL OUTLET / FULL BORE PILOT VALVE This valve is suitable for extremely high capacity duties. It achieves maximum discharge capacities by having a full bore 8 inch inlet with an available discharge area of 44.178 sq.in. and two opposing 10 inch outlets, which can assist with reaction force problems. Available with Pilot Types 2 and 4. Capacity chart (full bore 8" x 10" x 10" pilot valve) Actual orifice area Air S.C.F.M. Water U.S.G.P.M. 44.178sq.in. @ 60ºF and 10% over pressure @ 10% over pressure Set pressure Pilot types 2 and 4 Pilot type 4 Psig Derated kd 0.802 Derated kd 0.658 29 30270 6239 50 45275 8192 100 81002 11585 150 116729 14189 200 152455 16384 250 188182 18318 300 223909 20067 350 259635 21674 400 295362 23171 450 331089 24576 500 366815 25906 550 402542 27170 600 438269 28378 650 473995 29537 700 509722 30652 740 538303 31516 *Note: Pilot type 2 is available from 29 Psig. Overpressure at 29 Psig is 3 Psig minimum. 96

REACTION FORCE - VAPOUR AND GASES The discharge from a safety relief valve exerts a reaction force on the valve or outlet piping. If the discharge piping is unsupported, this force is transmitted the valve inlet and associated piping. The following formula can be used determine the reaction force, assuming that critical flow of the gas or vapour occurs at the valve outlet. Discharge piping should be adequately supported. If pipework is not supported, it must be remembered that the reaction force will act on the end of the discharge pipe, and that the discharge pipe will act as a lever. The force applied the valve will therefore be determined by the reaction force and the geometry of the discharge pipework. F = W kt (k+1) M 366 +(Po x Ao) F = Reaction force (lbs). W = Flow rate of gas or vapour (lb/hr). K = Ratio of specific heat (imperial). M = Molecular weight of gas or vapour. T = Temperature at valve inlet, degrees Rankine (equal degrees F plus 460). Po = Outlet pressure (Psig). Ao = Discharge connection area (in 2 ). 97

DEFINITION OF TERMS Pressure Relief Devices A pressure relief device is actuated by inlet static pressure and designed open during an emergency or abnormal conditions prevent a rise of internal fluid pressure in excess of a specified value. The device also may be designed prevent excessive internal vacuum. The device may be a pressure relief valve, a nonreclosing pressure relief device, or a vacuum relief valve. A spring-loaded pressure relief valve is a pressure relief device designed aumatically reclose and prevent the further flow of fluid. A relief valve is a spring-loaded pressure relief valve, actuated by the static pressure upstream of the valve. The valve opens normally in proportion the pressure increase over the opening pressure. A relief valve is used primarily with incompressible fluids. A safety valve is a spring-loaded pressure relief valve, actuated by the static pressure upstream of the valve and characterised by rapid opening or pop action. A safety valve is normally used with compressible fluids. A safety relief valve is a spring-loaded pressure relief valve that may be used as either a safety or relief valve, depending on the application. A conventional pressure relief valve is a springloaded pressure relief valve whose performance characteristics are directly affected by changes in the back pressure on the valve. A balanced pressure relief valve is a springloaded pressure relief valve that incorporates a means for minimising the effect of back pressure on the performance characteristics. Dimensional Characteristics of Pressure Relief Devices The actual discharge area is the measured minimum net area that determines the flow through a valve. The curtain area is the area of the cylindrical or conical discharge opening between the seating surfaces above the nozzle seat created by the lift of the disc. The required discharge area is a nominal or computed area of a pressure relief valve used in recognised flow formulae determine the size of the valve. It will be less than the actual discharge area. The nozzle area is the cross-sectional flow area of a nozzle at the minimum nozzle diameter. A huddling chamber is an annular pressure chamber in a pressure relief valve located beyond the seat for the purpose of generating a rapid opening. The inlet size is the nominal pipe size (NPS) of the valve at the inlet connection, unless otherwise designated. The outlet size is the nominal pipe size (NPS) of the valve at the discharge connection, unless otherwise designated. Lift is the actual travel of the disc away form the closed position when a valve is relieving. A pilot-operated pressure relief valve is a pressure relief valve in which the main valve is combined with and controlled by an auxiliary pressure relief valve. A rupture disc device is a nonreclosing differential pressure relief device, actuated by inlet static pressure and designed function by bursting the pressure-containing rupture disc. A rupture disc device includes a rupture disc and a rupture disc holder. 98

OPERATIONAL CHARACTERISTICS The maximum operating pressure is the maximum pressure expected during system operation. The maximum allowable working pressure (MAWP) is the maximum gauge pressure permissible in a vessel at its designated temperature. The maximum allowable working pressure is the basis for the pressure setting of the pressure relief devices that protect the vessel. The design gauge pressure refers at least the most severe conditions of coincident temperature and pressure expected during operation. This pressure may be used in place of the maximum allowable working pressure in all cases where the MAWP has not been established. The design pressure is equal or less than the MAWP. Accumulation is the pressure increase over the maximum allowable working pressure of the vessel during discharge through the pressure relief device, expressed in pressure units or as a percentage. Maximum allowable accumulations are established by applicable codes for operating and fire contingencies. Overpressure is the pressure increase over the set pressure of the relieving device, expressed in pressure units or as a percentage. It is the same as accumulation when the relieving device is set at the maximum allowable working pressure of the vessel. Rated relieving capacity is that portion of the measured relieving capacity permitted by the applicable code or regulation be used as a basis for the application of a pressure relief device. Stamped capacity is the rated relieving capacity that appears on the device nameplate. The stamped capacity is based on the set pressure or burst pressure, plus the allowable overpressure for compressible fluids and the differential pressure for incompressible fluids. The set pressure is the inlet gauge pressure at which the pressure relief valve is set open under service conditions. The cold differential test pressure is the pressure at which the pressure relief valve is adjusted open on the test stand. The cold differential test pressure includes corrections for the service conditions of back pressure or temperature or both. Back Pressure is the pressure that exists at the outlet of a pressure relief device as a result of the pressure in the discharge system. It is the sum of the superimposed and built-up back pressure. Built up back pressure is the increase in pressure in the discharge header that develops as a result of flow after the pressure relief device opens. Superimposed back pressure is the static pressure that exists at the outlet of a pressure relief device at the time the device is required operate. It is the result of pressure in the discharge system coming from other sources and may be constant or variable. Blowdown is the difference between the set pressure and the closing pressure of a pressure relief valve, expressed as a percent of the set pressure or in pressure units. Opening pressure is the value of increasing inlet static pressure at which there is a measurable lift of the disc or at which discharge of the fluid becomes continuous. Closing pressure is the value of decreasing inlet static pressure at which the valve disc re-establishes contact with the seat or at which lift becomes zero. Simmer is the audible or visible escape of compressible fluid between the seat and disc at an inlet static pressure above the set pressure and at no measurable capacity. Leak-test pressure is the specified inlet static pressure at which a seat leak test is performed (normally 90% of set pressure according AP1 527). The term relieving conditions is used indicate the inlet pressure and temperature on a pressure relief device at a specific overpressure. The relieving pressure is equal the valve set pressure (or rupture disc burst pressure) plus the overpressure. (The temperature of the flowing fluid at relieving conditions may be higher or lower than the operating temperature.) Popping pressure is the pressure at which the valve disc rapidly moves from a slightly open (simmer) position a practically full open position. Discharge capacity is the actual mass flow rate of discharge which can also be expressed in volumetric terms. Equivalent capacity is the mass volumetric flow rate of a fluid calculated from the capacity of the valve for a test fluid. The fluids commonly used for the test purposes are steam, air and water. 99

PRESSURE TERM RELATIONSHIP Pressure Vessel Requirements Vessel Pressure % Design Pressure Safety Valve Characteristic Maximum permited accumulated pressure 110 Maximum relieving pressure Accumulation Overpressure (Typical) Design pressure 100 Set pressure Blowdown (Typical) Reseat pressure Operating margin Maximum operating pressure 90 Notes: The system operating pressure must not exceed the reseat pressure of the safety valve. Blowdown control is designed conform ASME Code Section V111, however liquid applications may demand up 15% blowdown. Overpressure and blowdowns shown are typical for spring loaded SRVs and can be reduced when using Safeset Pilot Operated SRVs. Refer the appropriate catalogue section for details. 100

NOTES Birkett Pressure Protection 101

SAFETY RELIEF VALVES B/C Series D Series WB Series Safeset COMPLEMENTARY PRODUCT LINES Bursting Discs Pressure Vacuum Valves Flame Arresters 102

Safety Systems UK Ltd. Sharp Street,Worsley, Manchester, UK, M28 3NA. Tel +44 (0)161 703 1977 Fax +44 (0)161 703 8451 Email support@safetysystemsuk.com Web site www.safetysystemsuk.com BIPR0410 Registered Office: Vicria Road, Leeds, LS11 5UG, UK