Materials Safety on Gas and Steam Pressure Measurement Maximum Working Pressure Pulsation etc.
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1 Pressure Gauges Introduction These notes have been prepared to assist in the selection and installation of Pressure Gauges for the purpose of ensuring, as far as possible they give a satisfactory service on the application for which they were intended and to ensure the highest possible level of safety. For further information, reference should be made to relevant British Standards on which these notes are largely based. All dial instruments included within this literature are available with contractors motifs printed onto the dials. Materials The most usual wetted parts used in the construction of these gauges are made from brass and bronze and similar non ferrous materials. Such gauges are suitable for use on oil, water and other non-corrosive fluids. For corrosive fluids, alternative materials e.g. stainless steel should be specified. For special applications e.g. when the pressure medium may solidify in the tube or may contain solids in suspension, alternative designs of pressure gauges such as diaphragm or a chemical seal type should be used. Environmental conditions should be taken into account when considering suitable materials for construction parts other than for wetted parts. Safety on Gas and Steam Pressure Measurement For certain gas applications, safety pattern gauges MUST be used and these must incorporate a solid baffle between dial and pressure element, a splinter-proof or clear plastic window and blow-out release. Surface mounting gauges with a blow-out release at the back, MUST be mounted at least 20mm away from the surface panel by means of distance pieces. For oxygen, safety pattern gauges MUST be used, they MUST be supplied, degreased and kept free from oil contamination. For Acetylene, safety pattern gauges MUST be used. For Steam and Gases, other than oxygen and acetylene, gauges of normal construction with a diameter of less than 100mm may be used for pressure ranges up to 25bar. For gauges 100mm diameter and greater the gauge must have a blow-out device. For higher pressure ranges, safety patterns must be used. Maximum Working Pressure While gauges will withstand the full scale pressure, the working pressure should not exceed 75% of the full scale range for fluctuating pressures. Pulsation etc. If pressures are expected to pulsate violently, oscillate with high frequency or occur with sudden shock, the manufacturer should be consulted. V6 10.1
2 Pressure Gauges Mechanical Vibration Gauges should be mounted away from vibration and connected by means of flexible piping. If this is not possible the manufacturer should be consulted. Where liquid filled case gauges are used, a safety release MUST be incorporated in the case. Temperature If used on steam or other hot gases or liquids, gauges MUST be protected by the use of an effective syphon or by other means. A gauge is unduly hot if it cannot be grasped by hand without discomfort. It should also be remembered that gauges used on water may burst if exposed to frost. Working fluids at a temperature exceeding 60 o C* should not enter the bourdon tube or other wetted parts. Mounting All gauges should be mounted in a vertical position unless otherwise agreed with the manufacturer. Cocks and Valves Gauges should normally be fitted with either a cock or valve. This enables the gauge to be removed at any time for checking or any other purpose. These cocks or valves MUST be opened or closed slowly to avoid sudden changes of pressure on the gauge. *According to BS:EN837-1: V6
3 Pressure Gauges Gauges on this page comply with BS EN FIG 408 DM Black Steel Case Direct Mounting Bezel: 2" and 2½" have black plastic case with acrylic window. 4" and 6" black steel case with bright bezel and glass window. Connection Sizes: ¼" BSP for 2" and 2½" models. ¾" 8 BSP for 4" and 6" models - Also incorporates blow out device. Dual Scale reading 408DMP 100mm also available as Class 1 and this option should be selected if surface mounting back flange or Perspex windows are required. Other Gauges Available Other pressure ranges available on request for FIG 408DM and 407DM. Gauges available with stainless steel cases, bezels and/or stainless steel wetted parts. Also available with back entry connection. 2" (50mm) 2½" (63mm) Perspex 408DMP 6" (150mm) Pressure Range Bar Ibf/in * * * * * V6 10.3
4 Pressure Gauges Gauges on this page comply with BS EN FIG 410 DM All Stainless Steel Gauge All wetted parts in 316 stainless steel. Bezel: 304, acrylic window. Direct mounting. Dual Scale reading. Glycerine fillable. Connection Size: ½" BSP FIG 407 DM Brass Case 6" (150mm) Pressure Range Bar Ibf/in Direct Mounting. Bezel: Brass. Connection Sizes: ¼" BSP for 3" models. ¾" 8 BSP for 4" and 6" models Also incorporates blow out device. Dual scale reading. 3" (80mm) 6" (150mm) Pressure Range Bar Ibf/in * * * * * * * *These gauges are full safety pattern and comply with the safety requirements of BS EN FIG 407 DM - B FIG 409S Sprinkler Gauge Direct Mounting. Bezel: Stainless Steel Connection Size: ¾" 8 BSP Pressure Range Bar Ibf/in V6
5 FIG 223 DM Low Pressure Capsule Gauge Polished Brass Case Pressure Gauges Gauges on this page comply with BS EN Direct Mounting. Bezel: Brass. Connection Size: ¾" 8 BSP. Pressure Range mbar w.g FIG 342 DM Liquid Filled Stainless Steel Case Direct Mounting. Bezel: Stainless Steel. Connection Sizes: ¼" BSP for 2½" models, ¾" 8 BSP for 4" models. Weatherproof construction. 2½" dia are glycerine filled, 4" dia are silicone oil filled. 2½" (63mm) Pressure Range Bar Ibf/in V6 10.5
6 Vacuum Gauges Gauges on this page comply with BS EN and -3 FIG 412 DM Black Steel Case Direct Mounting. Bezel: Chrome Plated. Connection Size: ¾" 8 BSP. FIG 411 DM Brass Case Direct Mounting. Bezel: Brass. Connection Size: ¼" BSP for 3" models and ¾" 8 BSP for 4" and 6" models. 3" (80mm) 6" (150mm) Model Range In Hg Bar FIG 412 DM to FIG 411 DM to Compound Gauges FIG 420 DM Brass Case Direct Mounting. Bezel: Brass. Connection Size: ¼" BSP for 3" models and ¾" 8 BSP for 4" and 6" models. pound Gaug FIG 421 DM Black Steel Case Direct Mounting Bezel: Chrome Plated. Connection Size: ¾" 8 BSP. 3" (80mm) 6" (150mm) Model In Hg lbf/1n 2 Bar -30 to 30-1 to FIG 420 DM -30 to 60-1 to to to FIG 421 DM -30 to 30-1 to V6
7 FIG 416 DM Black Steel Case Direct Mounting. Bezel: Chrome Plated. Connection Size: ¾" 8 BSP FIG 415 DM/417 DM Brass Case Direct Mounting. Bezel: Brass. Connection Size: ¾" 8 BSP Altitude Gauges Gauges on this page comply with BS EN class 1 ude Gauges FIG 416 Description FIG 416 DM Black Steel Case FIG 415 DM Brass Case 6" (150mm) Range Feet Metres 0 to to to to to to to to to to Description FIG 416 DM Black Steel Case FIG 417 DM Brass Case 6" (150mm) Range Bar Metres V6 10.7
8 Filterstar Differential Pressure Gauges Black Steel Case. Surface mounting (option to flush mounting with rear connections). Bezel: Stainless Steel. Connections: twin push on connections for 6mm ID hose at the side. Suitable for air or other non-corrosive gases at pressures not exceeding 1 bar. Range w.g. mmh20 Pa Ancillary Equipment For Gauges Flanged Backplates Two self-tapping screws are fitted on the back of certain models of the 3", 4", and 6" (80mm, 100mm and 150mm) gauges offered. For direct mounting applications these screws should remain untouched but for the surface mounting installations the screws must be removed and a flanged backplate should be fixed to the back of the gauge with these two screws. Backplates are available in steel or brass to match the gauge cases. For use with Class 1 gauges only 3" (80mm) 6" (150mm) Description Flanged Backplate Steel Flanged Backplate Brass V6
9 Gauge Cocks FIG 393S ge Cocks Three-way gauge cock to allow inspectors gauge cock to be fitted when checking existing gauge. ¾" 8 BSP Female connection. Working pressure 150Ibf/in.sq. water. FIG 394S Brass gauge cock with polypropylene handle. ¼", ¾" 8 and ½" BSP female connection. Working pressure 150Ibf/in.sq. water. FIG 396S Brass gauge cock with polypropylene handle. Union and tail pipe screwed ½", 8 ¼", ¾" 8 and ½" BSP connections. Working pressure 150Ibf/in.sq. water. Gauges Note: Gauges and gauge and gauge cocks cocks used used on on steam steam applications should be protected from live steam by a syphon, filled with water, before the gauge and gauge cock are put into service. Please ensure that working pressures of cocks, syphons etc. are suitable for installation requirements. FIG 395S Brass gauge cock with brass handle. ¼", ¾", 8 and ½" 8 BSP female connections. Working pressure 150Ibf/in.sq. water. ¼" (8mm) ¾" 8" (10mm) ½" (15mm) Description FIG 393S Gauge Cock FIG 394S Gauge Cock (Brass) FIG 395S Gauge Cock (Chrome Plated) FIG 395S Gauge Cock FIG 396S Gauge Cock ¼" (8mm) ¾" 8" (10mm) ½" (15mm) Description Brass High Pressure Gauge Valves M/F Stainless Steel Gauge Valve M/F V6 10.9
10 Ancillary Equipment For Gauges "U" Pattern Syphons FIG 398S Polished Brass Max. Working Pressure: 100Ibf/in. sq. Sizes: ¼" BSP, ¾" 8 BSP and ½" BSP. FIG 401S Mild Steel BMax. Working Pressure: Water: 42 bar. Steam: 21 bar 260 o C. Sizes: ¼" BSP, ¾" 8 BSP and ½" BSP. FIG 399S Stainless Steel 316L Max. Working Pressure: Water: 42 bar. Steam: 21 bar 260 o C. Size: ½" BSP. "Ring" Pattern Syphons FIG 400S Polished Brass Max. Working Pressure: 100Ibf/in. sq. Sizes: ¼" BSP, ¾" 8 BSP and ½" BSP. FIG 403S Mild Steel Max. Working Pressure: Water: 42 bar. Steam: 21 bar 260 o C. Sizes: ¼" BSP, ¾" 8 BSP and ½" BSP. FIG 402S Stainless Steel Max. Working Pressure: Water: 42 bar. Steam: 21 bar 260 o C. Size: ½" BSP. Snubbers FIG 432S Brass (also available in stainless steel) Adjustable snubbers to eliminate surge and pressure pulsation to pressure gauges. ¼" maximum working pressure o C. ¾" 8 and ½" maximum working pressure o C. ¼" (8mm) ¾" 8" (10mm) ½" (15mm) Description FIG 398S U Syphon Brass FIG 400S Ring Syphon Brass FIG 401S U Syphon Mild Steel FIG 403S Ring Syphon Mild Steel FIG 399S U Syphon Stainless Steel FIG 402S Ring Syphon Stainless Steel FIG 432S Snubbers V6
11 Thermometers Introduction These notes have been prepared to assist in the selection and installation of Thermometers for the purpose of ensuring, as far as possible they give a satisfactory service on the application for which they were intended and to ensure the highest possible level of safety. For further information, reference should be made to relevant British Standards on which these notes are largely based. All dial instruments included within this catalogue are available with contractors motifs printed onto the dials. Location of Bulb The bulb of the instrument at the base of the stem, should be located where it is subject to the true temperature of the heated medium. Temperature gradients within the medium must be allowed for, and with instruments allowing variable depth of immersion (compression gland type) the bulb position should be varied experimentally until the optimum position is found. The full length of the sensitive portion of the bulb must at all times be immersed in the medium but direct contact with the source of heat to the medium should be avoided. When securing the bulb on its location by means of the gland screw(s) care must be taken not to twist or distort the neck of the bulb. Where a pocket has been supplied this should be securely installed before the bulb is inserted. It may be found that the rate of the response of a pocketed bulb is improved by filling the intervening space with oil or copper (depending on the materials and operating temperatures). Location Tubing The tube between the bulb and the instrument should be routed so that it is not subjected to large temperature changes, and should be supported in cleats. Bends should not be less than 1inch radius and under no circumstances must the tubing be cut. Where the tubing is likely to be exposed to corrosive atmosphere the exterior should be treated with an anti-corrosive paint and, in any case, should be inspected periodically for any signs of damage. The capillary tubing between the bulb and the indicator is coiled for despatch purposes. This tubing must be uncoiled carefully in order to avoid twisting or kinking which would affect the accuracy of the system. Maintenance Where there is a risk of corrosion, the bulb should be inspected periodically. If corrosion is evident it should be removed if possible by non-abrasive treatment. Any contamination on the bulb should be removed. Where a pocket is fitted this should be removed and inspected and treated similarly. If severe corrosion is evident the pocket should be replaced. It is advisable to inspect the capillary tubing periodically for corrosion or mechanical damage. An occasional temperature check should be carried out. Maximum Working Temperature The working temperature should not exceed 60% of the full scale reading. V
12 Thermometers Certification Test Certificates and Calibration Certificates are available for all 80, 100 and 150mm dia pressure gauges shown in this price list. They are also available for vapour pressure and mercury-in-steel thermometers Price on application. Test and Calibration Certificates show the instrument serial number which is also printed on the dial and for this reason it is necessary to order these prior to manufacture. As an alternative to test certificates all BSS branches are able to provide Quality Statements that conform to all the test details shown on a test certificate but do not bear serial numbers. Calibration certificates are more detailed and are more generally supplied with instruments used specifically for test purposes V6
13 Vapour Pressure Thermometers FIG 438S Black Steel Case Straight Stem Dual Size: 4" and 6" (100mm and 150mm). Bezel: Chrome plated. Connection Size: ½" BSP. Complete with pocket. 100mm Immersion length. Thermometers FIG 439S Black Steel Case Angle Stem Dual Size: 4" and 6" (100mm and 150mm). Bezel: Chrome plated. Connection Size: ½" BSP. Complete with pocket. 100mm Immersion length. FIG 440S Black Steel Case Surface Mounting Dual Size: 4" and 6" (100mm and 150mm). Bezel: Chrome plated. Connection Size: ½" BSP. Complete with 2m Capillary. 100mm Immersion length. FIG 448S Brass Case Straight Stem Dual Size: 4" and 6" (100mm and 150mm). Bezel: Chrome plated. Connection Size: ½" BSP. Complete with pocket. 100mm Immersion length FIG 449S Brass Case Angle Stem Dual Size: 4" and 6" (100mm and 150mm). Bezel: Chrome plated. Connection Size: ½" BSP. Complete with pocket. 100mm Immersion length. FIG 450S Brass Case Surface Mounting Dual Size: 4" and 6" (100mm and 150mm). Bezel: Chrome plated. Connection Size: ½" BSP. Complete with 2m Capillary. 100mm Immersion length. Description o F Temp. Tange o C 6" (150mm) FIG 438S Straight Stem FIG 438S Straight Stem to FIG 439S Angle Stem FIG 439S Bottom Back to FIG 440S Surface Mounting FIG 448S Straight Stem FIG 449S Angle Stem FIG 450S Surface Mounting V
14 Thermometers Altitherm Combined Altitude and Thermometer FIG EG100 Black Steel Case Size: 3" (80mm). Bezel: Chrome. Connection Size: ½" BSP. Altitherm Co Description o F o C Feet Metres FIG EG100 Altitherm Bi-Metal Thermometers Thermometers FIG 428S AND FIG 429S Black Steel Case F FIG 429S Dual Size: 4" and 6" (100mm and 150mm). Bezel: Chrome plated. Connection Size: ½" BSP. Immersion Length: 63mm or 100mm. Complete with pocket. Accurate to +/-1% FSD. FIG 428S 6" (150mm) Temp. Range Immersion Length Immersion Length 63mm 100mm 63mm 100mm o F o C FIG 428S Vertical Immersion Type -20 to to FIG 429S Centre Back Immersion Type -20 to to V6
15 Thermometer Pockets FIG 465S Thermometers Pocket, 100mm long in steel, brass or stainless steel suitable for vapour pressure and mercury-in-steel thermometers. Also available 63mm long. ½" BSP ½" BSP (63mm Long) ¾" BSP Description Brass Pocket Steel Pocket Stainless Steel Pocket Bi-Metal Thermometers FIG 461S Black Steel Case FIG 463S Black Steel Case FIG 464S Black Steel Case Surface Contact Type Size: 2½" (63mm). Bezel: Chrome plated. Attaches to pipe by a spring band * These thermometers show only the surface temperature of the pipe and are not recommended where a good degree of accuracy is required. e Centre Back Immersion Type Size: 2½" (63mm). Bezel: Chrome plated. Connection Size: ½" BSP. Stem Immersion Length: 45mm. Complete with pocket.. Vertical Immersion Type Size: 2½" (63mm). Bezel: Chrome plated. Connection Size: ½" BSP. Stem Immersion Length: 45mm. Complete with pocket. e Description FIG 461S Surface Contact Thermometer Spring Fixing o F Temp. Range o C FIG 463S Centre Back Immersion Thermometer to to +50 FIG 464S Vertical Immersion Thermometer to to V
16 Ancillary Equipment for Thermometers Pressure Test Points MECHSEAL MKll TEST POINT kii BOSS TM pressure / temp test plugs in 316 s/steel available on request within 7-10 days in ¼" and ½" standard or ¼" and ½" extended type supplied E.P.D.M. as standard. Viton price on application. For Test Plugs see section 9. Description Mechseal Pressure Gauge Adaptor Mechseal Manometer Adaptor Mechseal Pressure Test Point Mechseal MkII Test Point V6
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