Section 7. Socket Weld and Threaded Fittings. Socket Weld and Threaded Fittings 7-1

Transcription

1 Section 7 Socket Weld and Threaded Fittings This Section contains dimension and tolerance information extracted from American and British specifications applicable to socket weld and threaded fittings. Subsections and topics Page High Pressure Fittings - General 7-2 Pressure/Temperature Ratings - BS Socket Weld Fittings - ANSI/ASME B16.11/BS Threaded Fittings - ANSI/ASME B16.11/BS Plugs and Bushings - ANSI B16.11/BS Hexagonal and Round Nipples - BS Welding Bosses - BS Threaded Unions - BS Swage Nipples - BS Outlets 7-19 to 7-25 Low Pressure Threaded Fittings - General 7-26 Equal Elbows, Tees and Crosses - BS Sockets - BS Caps and Plugs - BS Hexagonal Bushes and Nipples - BS ASME/ANSI and BS Specifications covered in this Section ANSI/ASME B Forged Fittings, Socket-welding and Threaded BS 3799: Steel Pipe Fittings, Screwed and Socket-welding for the Petroleum Industry BS 1740:Part 1:1971 Wrought Steel Pipe Fittings (screwed BSP thread) Page

2 High Pressure Fittings - General This subsection summarises requirements for high pressure (HP) socket weld and threaded fittings as defined in ASME/ANSI B and BS 3799:1974. Dimensions are reproduced in pages 7-6 to 7-25, including coverage of Outlet fittings that are also used in high pressure applications. Specifications The specifications applicable to high pressure socket weld and threaded fittings are as follows: ASME/ANSI B Forged fittings, socket-welding and threaded. BS 3799: Steel pipe fittings, screwed and socket-welding for the petroleum industry. This specification is substantially the same as B A summary of the fittings, sizes and pressure ratings (class designations) covered by B16.11 and BS 3799 is provided in the tables below. The first table also shows the pipe weights defined as compatible with the various classes of fitting. Class designations in B and BS 3799:1974 Class Designation 1 (lb) Pipe defined as normally used with the fittings 2 B BS 3799:1974 Socket Weld Threaded Socket Weld Threaded Schedule 80/XS Schedule 80/XS Schedule 160 Schedule 80 3 Schedule Schedule 160 XXS Schedule XXS 9000 XXS Notes 1 Class designations correspond to the maximum cold working pressure of fittings in pounds force per square inch. 2 The wall thicknesses quoted are not restrictive but do correlate for calculation of pressure ratings. Thicker or thinner pipe may be used, but when thinner pipe is used its strength should govern the pressure rating. 3 Bore dimensions for Class socket welding fittings correspond to Schedule 40 pipe. 4 Bore dimensions for Class socket welding fittings correspond to Schedule 160 pipe. Summary of coverage provided by B and BS 3799:1974 B BS 3799:1974 Socket Weld Threaded Socket Weld Threaded Types of fittings Notes 1 Plugs and bushes are not designated by Class and may be used for ratings up to Class. 2 Swage nipples may be ordered in any combination of end preparation lb Elbows, 90 and 45 Crosses Tees Couplings and half couplings Caps Square, hexagonal and round plugs 1 Hexagonal head bushings 1 Flush bushings 1 Hexagonal and round nipples Unions Welding bosses Swage nipples lb 7-2

3 High Pressure Fittings - General Dimensions and Tolerances Dimensions. See pages 7-6 to 7-25 for HP fitting dimensions. Size Designations for Reducing Fittings x 2 x 3 where 1 is the largest noal size x 2 x 3 x 4 where 1 and 3 are the larger noal sizes Tolerances specified in ASME/ANSI B16.11 are included in the dimension tables. BS 3799 tolerances are substantially the same. Additional tolerances are as follows: Fitting bore and socket bore tolerances NPS Tolerance All ±0.8 mm Concentricity of bores Alignment of axes All 0.06 in per 1 ft, or 1 in 200 Manufacture ASME/ANSI B ASME/ANSI stainless steel socket weld or threaded fittings are most commonly manufactured from material conforg to ASTM A182 (see page 4-6). BS 3799:1974. Manufacturing requirements are substantially the same as for B Stainless steel grades specified are as indicated in the pressure/temperature ratings table on page 7-4. Marking should include (in priority order): - Manufacturers name or trademark - Material identification (in accordance with A 182, - Class or pressure ratings (e.g. ) - Size Markings may be omitted (least priority first from above list) if fitting size or shape imposes limits. Outlets. Socket weld and threaded outlets comply with B16.11 requirements, although B16.11 does not specifically cover outlets. Pressure Ratings General. The Class designation (e.g. ) of the high pressure fittings indicates the maximum cold working pressure. ASME/ANSI B16.11 Fittings. ASME/ANSI B16.11 specifies the allowable pressure/ temperature rating to be that of seamless pipe of the equivalent material and wall thickness. BS 3799 Fittings. BS 3799 includes a table of pressure/temperature rating. This is reproduced on page 7-4. Outlets. These fittings conform to the pressure requirements of ASME/ANSI B

4 Pressure/Temperature Ratings - BS 3799 This subsection covers the pressure ratings for high pressure stainless steel socket weld and threaded fittings covered in BS See page 7-3 for ANSI/ASME B16.11 pressure rating requirements. Pressure/temperature ratings from BS 3799:1974 Stainless Steel Grades and Classes (lb) WP304 WP304H WP304L WP321 WP321H WP347 WP347H WP316 WP316H WP316L WP317 WP309 WP310 Temp C Pressure Rating, max, Bar -100/ / /

5 Pressure/Temperature Ratings - BS 3799 Pressure/temperature ratings from BS 3799:1974 (Continued) Stainless Steel Grades and Classes (lb) WP321 WP321H WP347 WP347H WP316 WP316H WP316L WP317 WP309 WP310 WP304 WP304H WP304L Temp C Pressure Rating, max, Bar Notes - The pressure ratings assume stainless steel forging material manufactured as follows (ASTM A 182 equivalents are approximate): WP304 = BS S40 = A 182 F304 WP304L = BS S30 = A 182 F304L WP321 = BS S40 = A 182 F321 WP316 = BS S40 or S41 = A 182 F316 WP316L = BS S30 or S31 = A 182 F316L - The pressure ratings assume stainless steel pipe manufactured as follows (ASTM A 312 equivalents are approximate): WP304 = BS S18 = A 312 TP304 WP304L = BS S14 = A 312 TP304L WP321 = BS S18 = A 312 TP321 WP316 = BS S18 = A 312 TP316 WP316L = BS S14 = A 312 TP316L 7-5

6 Socket Weld Fittings - ANSI B16.11/BS 3799 Dimensions and tolerances (based on ASME/ANSI B and BS 3799:1974) Centre to Bottom of Socket Socket Bore Diameter Socket Bore Wall Diameter of Fittings Thickness NPS max/ave/ 90 Elbows, Tees, & Crosses 45 Elbows in mm in mm in mm in mm in mm in mm in mm max /8 ave max /4 ave max /8 ave max /2 ave max /4 ave max ave max /4 ave max /2 ave max ave max /2 ave max ave max ave Notes - Average socket wall thickness C around periphery shall not be less than the listed values. Minimum values are permitted in localised areas. - Dimensions B and J are the same for Class 3000, 6000 and 9000 lb fittings. - Dimensions and tolerances shown are as specified in ASME/ANSI B These agree substantially with BS 3799:1974. Exceptions are indicated in the following note. - BS 3799 does not cover NPS 4. Body Wall Depth of Socket 7-6

7 Socket Weld Fittings - ANSI B16.11/BS 3799 Dimensions and tolerances (based on ASME/ANSI B and BS 3799:1974) Socket Bore Diameter Socket Depth Laying Lengths Bore Wall of NPS Diameter of Fittings Thickness Socket Couplings Half Couplings max/ave/ Cap End Wall Thickness in mm in mm in mm in mm in mm in mm in mm max /8 ave max /4 ave max /8 ave max /2 ave max /4 ave max ave max /4 ave max /2 ave max ave max /2 ave max ave max ave Notes - Average socket wall thickness C around periphery shall not be less than the listed values. Minimum values are permitted in localised areas. - Dimensions B, J, E and F are the same for Class 3000, 6000 and 9000 lb fittings. - Dimensions and tolerances shown are as specified in ASME/ANSI B These agree substantially with BS 3799:1974. Exceptions are indicated in the following notes. - BS 3799 does not cover NPS 4. 1 These values for K are BS 3799 imum values, quoted because they differ from the ASME/ANSI B16.11 values. 7-7

8 Socket Weld Fittings - ANSI B16.11/BS 3799 Dimensions and tolerances (based on ASME/ANSI B and BS 3799:1974) Centre to Bottom of Socket Socket Bore Diameter Socket Bore Wall Diameter of Fittings Thickness NPS max/ave/ 90 Elbows, Tees, & Crosses 45 Elbows in mm in mm in mm in mm in mm in mm in mm max /8 ave max /4 ave max /8 ave max /2 ave max /4 ave max ave max /4 ave max /2 ave max ave max /2 ave max ave Notes - Average socket wall thickness C around periphery shall not be less than the listed values. Minimum values are permitted in localised areas. - Dimensions B and J are the same for Class 3000, 6000 and 9000 lb fittings. - Dimensions and tolerances shown are as specified in ASME/ANSI B These agree substantially with BS 3799:1974. Exceptions are indicated in the following notes. - BS 3799 does not cover NPS 1 /8, 1 /4, 3 /8 or 4. BS 3799 dimensions and tolerances are shown in italics. 1 BS 3799 covers elbows, tees and crosses at NPS 2 1 /2 and 3 (not covered by ASME/ANSI B16.11). Body Wall Depth of Socket 7-8

9 Socket Weld Fittings - ANSI B16.11/BS 3799 Dimensions and tolerances (based on ASME/ANSI B and BS 3799:1974) Socket Bore Diameter Socket Depth Laying Lengths Bore Wall of of Fittings Half NPS Diameter Thickness Socket Couplings Couplings max/ave/ Cap End Wall Thickness in mm in mm in mm in mm in mm in mm in mm max /8 ave max /4 ave max /8 ave max /2 ave max /4 ave max ave max /4 ave max /2 ave max ave max /2 ave max ave max ave Notes - Average socket wall thickness C around periphery shall not be less than the listed values. Minimum values are permitted in localised areas. (Dimension C is not specified in ASME/ANSI B16.11 for Class Caps larger than NPS 2.) - Dimensions B, J, E and F are the same for Class 3000, 6000 and 9000 lb fittings. - Dimensions and tolerances shown are as specified in ASME/ANSI B These agree substantially with BS 3799:1974. Exceptions are indicated in the following notes. - BS 3799 does not cover NPS 1 /8, 1 /4, 3 /8 or 4. BS 3799 dimensions and tolerances are shown in italics. 1 These values for K are BS 3799 imum values, quoted because they differ from the ASME/ANSI B16.11 values. 7-9

10 9000 lb Socket Weld Fittings - ANSI B Elbow Cross Tee 45 Elbow Coupling Half-Coupling Cap Dimensions and tolerances (based on ASME/ANSI B ) Centre to Bottom of Socket Laying Lengths 90 Elbows, Socket Bore Diameter Socket Body Wall Depth of Socket Tees, & 45 Elbows Bore Diameter of Fittings Wall Thickness Couplings Half Couplings NPS Crosses Cap End Wall Thickness in mm in mm in mm in mm in mm in mm in mm in mm in mm in mm max/ave/ 1 /2 ave max /4 ave max /4 1 1 /2 2 max ave max ave max ave max ave Note - BS 3799 does not specify Class 9000 lb socket weld fittings. Otherwise, notes for Class fittings on pages 7-8 and 7-9 also apply to this table. 7-10

11 2000 lb, and Threaded Fittings - ANSI B16.11/BS Elbow Tee Cross 45 Elbow Dimensions and tolerances (based on ASME/ANSI B and BS 3799:1974) Centre to End Centre to End 45 OD of Band, Wall Thickness, Length of Thread, lb 2000 lb 2000 lb 2000 lb in mm in mm in mm in mm in mm in mm in mm in mm in mm in mm in mm in mm in mm in mm 1 / / / / / / / / NPS Note - Dimensions and tolerances shown are as specified in ASME/ANSI B These agree substantially with BS 3799:1974. Exceptions are indicated in the following notes. - BS 3799 does not cover any Class 2000 lb fittings, and Class fittings with NPS < 1 /2. - BS 3799 dimensions G and L 2 vary slightly from the ANSI values quoted. Dimension B is not specified in BS Dimension B is the length of perfect thread. L 2 is the effective length of thread based on ANSI/ASME B (NTP), see page

12 and Threaded Fittings - ANSI B16.11/BS 3799 Coupling Half Coupling Cap Dimensions and tolerances (based on ASME/ANSI B and BS 3799:1974) End to End Couplings End to End Caps OD End Wall Thickness Length of Thread & in mm in mm in mm in mm in mm in mm in mm in mm in mm 1 / / / / / / / / NPS Note - Dimensions and tolerances shown are as specified in ASME/ANSI B These agree substantially with BS 3799:1974. Exceptions are indicated in the following notes. - BS 3799 does not cover Class caps with NPS >2. - BS 3799 dimensions G and L 2 vary slightly from the ANSI values quoted. Dimension B is not specified in BS Dimension B is the length of perfect thread. L 2 is the effective length of thread based on ANSI/ASME B (NTP), see page

13 Plugs and Bushings - ANSI B16.11/BS 3799 Square Head Plug Hex Head Plug Round Head Plug Dimensions and tolerances (based on ASME/ANSI B and BS 3799:1974) Square Head Plugs Round Head Plugs Hex Plugs and Bushings Length Height of Square Width Flats Diameter of Head Length Width Flats Hex Height, NPS noal noal in mm in mm in mm in mm in mm in mm in mm in mm 1 / / / / / / / / Notes - Plugs and bushes are not designated by Class and may be used at ratings up to Class. - Dimensions and tolerances shown are as specified in ASME/ANSI B These agree substantially with BS 3799:1974. Hexagonal Head Bushing Flush Bushing Note Hex bushings of one size reduction should not be used where they could be subject to harmful loads and pressures other than internal pressure. 7-13

14 Hexagonal and Round Nipples - BS 3799 Hexagonal nipple dimensions (based on BS 3799:1974) Noal Size Hexagonal Nipples Equal Reducing in mm in mm mm mm mm mm mm mm mm 1 / / /4 x 1 /8 8 x / /8 x 1 /4 10 x / /2 x 3 /8 15 x /2 x 1 /4 15 x / /4 x 1 /2 20 x /4 x 3 /8 20 x x 3 /4 25 x x 1 /2 25 x / /2 x 1 40 x /2 x 3 /4 40 x /2 x 1 /2 40 x x 1 1 /2 50 x x 1 50 x x 3 /4 50 x x 1 /2 50 x Round Nipples Round nipple dimensions (based on BS 3799:1974) Noal Size Standard Lengths Wall Thickness in mm mm mm mm mm 1 / / / / / Schedule / XXS 2 1 / Note - Other round nipple lengths, L, are available when specified. 7-14

15 Welding Bosses - BS 3799 Threaded Fitting Socket Weld Fitting Threaded welding boss dimensions (BS 3799:1974) Length of Thread Length Bore Diameter Outside Diameter Noal Size in mm mm mm mm mm mm 1 / / / / / / / Socket-welding welding boss dimensions (BS 3799:1974) NPS Bore Diameter of Socket Socket Wall Thickness Bore Diameter of Fitting Length Depth of Socket in mm mm mm mm mm mm mm mm 1 / / / / / / /

16 Threaded Unions - BS 3799 Threaded union dimensions (BS 3799:1974) Noal Size End to End Width A/F Union Nut Height of Union Nut Width A/F of Ends Thickness of Shoulder Length of Thread in mm mm mm mm mm mm mm 1 / / / / / / / /

17 Socket Weld Unions - BS 3799 Socket weld union dimensions (BS 3799:1974) NPS Depth of Socket Distance between Bottom of Sockets Bore Diameter of Sockets Note - Bore diameter D corresponds to schedule 40 pipe. Socket Wall Thickness Bore Diameter of Union Thickness of Shoulder Width A/F of Nut Height of Nut in mm mm mm mm mm mm mm mm mm 1 / / / / / / / /

18 Swage Nipples - BS 3799 Plain Threaded Threaded Plain Dimensions of swage nipples (BS 3799:1974) Parallel Length, Eccentricity Wall Thickness Noal Size (both ends) Threaded Plain Threaded /Plain in mm mm mm mm mm mm 3 /8 x 1 /4 10 x /2 x 3 /8 15 x /2 x 1 /4 15 x /4 x 1 /2 20 x Schedule 160 XXS 3 /4 x 3 /8 20 x x 3 /4 25 x x 1 /2 25 x /2 x 1 40 x /2 x 3 /4 40 x /2 x 1 /2 40 x Schedule 2 x 1 1 /2 50 x x 1 50 x x 3 /4 50 x Schedule 2 x 1 /2 50 x XXS 2 1 /2 x 2 65 x /2 x 1 1 /2 65 x x 2 1 /2 80 x x 2 80 x x 1 1 /2 80 x x x x 2 1 /2 100 x

19 Outlets Outlets may be used in place of welded or threaded tees to reduce costs and provide more flexible fabrication ( run your pipe then weld on fittings ) while maintaining full pipe strength for all sizes, weights and schedules. The following pages contain the dimension tables for socket weld, threaded and buttweld outlets. Note - Manufacture s information is used as the basis for information in this outlets subsection. Manufacturers data may vary. Specifications Manufacture. Socket weld and threaded outlets are manufactured to the requirements of ASME/ ANSI B Forged fitting, socket welding and threaded, although outlet dimensions are not specified in B Buttweld outlets are manufactured to the requirements of ASME/ANSI B Factory-made wrought steel buttwelding fittings, although outlet dimensions are not specified in B16.9. Pressure Rating. Outlets are rated the same as seamless steel pipe, as defined in the American National Standard Codes for Pressure Piping, ANSI B31.1 and B31.3, the ASME Boiler and Pressure Vessel Code. Refer to page 5-28 for a summary of pipe pressure rating calculations. Designations In order to reduce warehouse inventories, outlets of the same size are designed to be used with the a range of run pipe sizes. This can be done without causing a problem when welding because the resulting maximum gap between welded surfaces (caused by the curvature of the outlet when compared with the pipe) is only 1 /32 in (0.8 mm). The table below shows the range of outlets available. For example: outlets with a run size range (e.g. 8-3 x 1 /2) will fit on any size of run pipes in the range (e.g. 3, 3 1 /2, 4, 5, 6 or 8). Run pipe sizes (NPS) for: Socket Weld Outlets, Threaded Outlets, Std & XS Buttweld Outlets, Run pipe sizes (NPS) for: Socket weld Outlets, Threaded Outlets, XXS Buttweld Outlets. Outlet Pipe Sizes (NPS) 1 /2 3 / /4 1 1 / / /2 4 >4 1 /2 3 / /4 1 1 / / / / /4 1 1 / / / /2-1 1 /4 1 1 / / / /2-1 1 /4 2 1 / / / / /2 3 1 / / / Flat Flat Flat - - Flat Flat Flat Flat Flat Flat / /4-1 1 /2 1 1 / / /4 2 1 /2-1 1 /4 2 1 / / / / / / Flat Flat Flat Order to specific run pipe size Flat Flat Flat Order to specific run pipe size 7-19

20 Socket Weld Outlets Reducing Size Full Size socket weld outlet dimensions and weights Reducing sizes Full sizes Weight Weight Outlet Size kg/ kg/ mm mm mm mm piece mm mm mm mm mm piece 1 / / / / / / socket weld outlet dimensions and weights Reducing sizes Outlet Size Weight mm mm mm mm kg/piece 1 / / / /

21 Threaded and Nipple Outlets Reducing Size Full Size threaded outlet dimensions and weights Outlet Size Reducing sizes Weight Full sizes Weight mm mm mm kg/piece mm mm mm mm kg/piece 1 / / / / / / threaded outlet dimensions and weights Reducing sizes Outlet Size Weight mm mm mm kg/piece 1 / / / / Plain end nipple outlet dimensions Reducing sizes mm mm mm mm 1 / / Outlet Size 1 1 / / Nipple 7-21

22 Buttweld Outlets Reducing Size Full Size Standard buttweld outlet dimensions and weights Outlet Size Reducing sizes Weight Full sizes Weight mm mm kg/piece mm mm mm kg/piece 1 / / / / / /

23 Buttweld Outlets Reducing Size Full Size Extra strong (XS) buttweld outlets dimensions and weights Outlet Size Reducing sizes Weight Full sizes Weight mm mm kg/piece mm mm mm kg/piece 1 / / / / / / Schedule 160 and double extra strong (XXS) buttweld outlets dimensions and weights Reducing sizes Full sizes Weight Outlet Size mm mm kg/piece mm mm mm 1 / / / / /

24 45 Lateral Outlets Socket Weld Threaded Buttweld lateral outlets - for 45 lateral connections dimensions and weights Dimensions Noal Run Outlet Size OD of Outlet Weight Sizes Socket Weld & Threaded Buttweld in mm mm mm - kg/piece 2 1 /2-1 1 /4, / /2-1 1 /4, / /2-1 1 /4, 12-3 / Outside /2-1 1 /4, 5-2, diameter at 12-6 / bevel /2-2, 5-2, matches the outlet 0.52 pipe diameter 2 1 /2-2, 5-3, / /2-2, 5-3, / , 8-6, lateral outlets - for 45 lateral connections dimensions and weights Dimensions Noal Elbow Outlet Size OD of Outlet Weight Size Socket Weld & Threaded Buttweld in mm mm mm - kg/piece 2 1 /2-1 1 /4, / /2-1 1 /4, 12-3 / /2-1 1 /4, 5-2, Outside 12-6 / diameter at 0.39 bevel 2 1 /2-2, 5-3, matches 12-6 / the outlet 2 1 /2-2, 5-3, pipe diameter /2-2, 5-3, / , 8-6, /

25 Elbow Outlets Socket Weld Threaded Buttweld elbow outlet for 90 long radius elbow, dimensions and weights Dimensions Noal Elbow Outlet Size OD of Outlet Weight Size Socket Weld & Threaded Buttweld in mm mm mm - kg/piece /4 1 / /4 3 / Outside /4 1 / diameter at /4 3 / bevel matches 0.52 the outlet / pipe diameter / elbow outlet for 90 long radius elbow, dimensions and weights Dimensions Noal Elbow Outlet Size OD of Outlet Weight Size Socket Weld & Threaded Buttweld in mm mm mm - kg/piece /4 1 / /4 3 / Outside /4 / diameter at 0.39 bevel / matches the outlet / pipe diameter /

26 Low Pressure Threaded Fittings - General This subsection summarises requirements for 150 lb low pressure (LP) threaded fittings as defined in BS 1740 : Part 1 : 1971 (as confirmed October 1983) - Wrought steel pipe fittings (screwed BSP thread). Dimensions and tolerances are reproduced in the following pages. Stainless steel low pressure threaded fittings are in general accordance with these dimensions and tolerances. Dimensions and Tolerances BS 1740 dimensions are as detailed in the following pages. Length tolerances are as specified below. BS 1740 Tolerances NPS Length of Socket Unions Length or Centre to Face Tolerances for Other Fittings ±mm ±mm < to >40 to >65 to >75 to >75 to > Threading Requirements Fittings manufactured to BS 1740 are threaded in accordance with BS 21:1985, Pipe threads for tubes and fittings where pressure-tight joints are made on the threads (metric dimensions). Summary dimensions are included below. For further information on BS 21 threads see page Internal parallel and external taper thread Noal Size of Outlet Internal Parallel Thread (R p ) Minimum Outside Diameter Minimum Outside Diameter of Body Behind External Thread External Taper Thread (R) Minimum Inside Diameter of Body Behind Internal Thread in mm mm mm mm 1 / / / / / / / /

27 Equal Elbows, Tees and Crosses - BS 1740 Equal Elbow Equal Tee Cross Equal Equal 45 Elbow Threaded equal 90 elbow, tee and cross dimensions (BS 1740:Part 1) Noal Size of Outlets Centre to Face in mm mm 1 / / / / / / / / Threaded equal 45 equal elbow dimensions (BS 1740:Part 1) Noal Size of Outlets Centre to Face in mm mm 3 / / / / /

28 Elbows - BS 1740 Equal Elbows, Male and Female Reducing Elbows Note - These may also be referred to as Street Elbows Threaded equal elbows, male and female dimensions (BS 1740:Part 1) Centre to face, Noal Size of Outlets Bore of Male End Bore of Male End max in mm mm mm mm mm 1 / / / / / / / Threaded reducing elbow dimensions (BS 1740:Part 1) Noal Size of Outlets Centre to Face, (1 x 2) in mm mm mm 1 /2 x 3 /4 15 x /2 x 3 /8 15 x /4 x 3 / x /4 x 1 /2 20 x x 1 /2 25 x x 3 /4 25 x /4 x 1 / x /4 x 3 /4 32 x /4 x 1 32 x /2 x 3 /4 40 x /2 x 1 40 x /2 x 1 1 /4 40 x x 3 / x x 1 50 x x 1 1 /4 50 x x 1 1 /2 50 x Note 1 Non-prefered size. The use of these sizes should be avoided. 7-28

29 Increasing and Reducing Tees - BS 1740 Increasing on the Branch Tee Reducing on the Run and Branch Tee Reducing on the Run Only Tee Threaded tee, increasing on branch, dimensions (BS 1740:Part 1) Noal Size of Outlets (1 x 2) Centre to Face in mm mm mm 3 /8 x 1 /2 10 x /2 x 3 /4 15 x /2 x 1 15 x /4 x 1 20 x x 1 1 /4 25 x x 1 1 /2 25 x /4 x 1 1 /2 32 x /2 x 2 40 x x 2 1 /2 50 x x 3 50 x Threaded tee, reducing on branch and/or run, dimensions (BS 1740:Part 1) Noal Size of Outlets (1 x 2 x 3) Centre to Face in mm mm mm 3 /4 x 1 /2 x 1 /2 20 x 15 x /4 x 1 /2 x 3 /4 20 x 15 x x 3 /4 x 1 /2 25 x 20 x x 3 /4 x 3 /4 25 x 20 x x 3 /4 x 1 25 x 20 x /4 x 1 x 3 /4 32 x 25 x /4 x 1 x 1 32 x 25 x /4 x 1 x 1 1 /4 32 x 25 x /2 x 1 x 1 40 x 25 x

30 Reducing Tees - BS 1740 Reducing on the Branch Tee Reducing tee dimensions (BS 1740:Part 1) Noal Size of Outlets Centre to Face, (1 x 2) in mm mm mm 3 /8 x 1 /4 10 x /2 x 1 /4 15 x /2 x 3 /8 15 x /4 x 1 /4 20 x /4 x 3 /8 20 x /4 x 1 /2 20 x x 1 / x x 3 / x x 1 /2 25 x x 3 /4 25 x /4 x 1 /2 32 x /4 x 3 /4 32 x /4 x 1 32 x /2 x 1 / x /2 x 3 /4 40 x /2 x 1 40 x /2 x 1 1 /4 40 x x 1 / x x 3 / x x 1 50 x x 1 1 /4 50 x x 1 1 /2 50 x /2 x 1 65 x /2 x 1 1 /2 65 x /2 x 2 65 x x 1 80 x x 1 1 /4 80 x x 1 1 /2 80 x x 2 80 x x 2 1 /2 80 x x 1 1 /2 100 x x x x x x x x x Note 1 Non-prefered size. The use of these sizes should be avoided. 7-30