7-1 Socket Weld and Threaded Fittings Amari Metals Ltd Tel. 0181 481 3300 Copyright Protected 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 3799 7-4 Socket Weld Fittings - ANSI/ASME B16.11/BS 3799 7-6 Threaded Fittings - ANSI/ASME B16.11/BS 3799 7-11 Plugs and Bushings - ANSI B16.11/BS 3799 7-13 Hexagonal and Round Nipples - BS 3799 7-14 Welding Bosses - BS 3799 7-15 Threaded Unions - BS 3799 7-16 Swage Nipples - BS 3799 7-18 Outlets 7-19 to 7-25 Low Pressure Threaded Fittings - General 7-26 Equal Elbows, Tees and Crosses - BS 1740 7-27 Sockets - BS 1740 7-31 Caps and Plugs - BS 1740 7-33 Hexagonal Bushes and Nipples - BS 1740 7-34 ASME/ANSI and BS Specifications covered in this Section Page ANSI/ASME B16.11-1991 - Forged Fittings, Socket-welding and Threaded 7-2 BS 3799:1974 - Steel Pipe Fittings, Screwed and Socket-welding for the Petroleum Industry 7-2 BS 1740:Part 1:1971 Wrought Steel Pipe Fittings (screwed BSP thread) 7-26
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Socket Weld and Threaded Fittings
Amari Metals Ltd
Section 7
Socket Weld and Threaded Fittings
This Section contains dimension and tolerance informationextracted from American and British specifications applicableto socket weld and threaded fittings.
Subsections and topics PageHigh Pressure Fittings - General 7-2
This subsection summarises requirements for high pressure (HP) socket weld andthreaded fittings as defined in ASME/ANSI B16.11-1991 and BS 3799:1974. Dimensionsare reproduced in pages 7-6 to 7-25, including coverage of Outlet fittings that are alsoused in high pressure applications.
SpecificationsThe specifications applicable to high pressure socket weld and threaded fittings are as follows:
❍ ASME/ANSI B16.11-1991 - Forged fittings,socket-welding and threaded.
❍ BS 3799:1974 - Steel pipe fittings, screwed andsocket-welding for the petroleum industry. Thisspecification is substantially the same as B16.11.
A summary of the fittings, sizes and pressureratings (class designations) covered by B16.11and BS 3799 is provided in the tables below. Thefirst table also shows the pipe weights defined ascompatible with the various classes of fitting.
Class designations in B16.11-1991 and BS 3799:1974
Notes1 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 3000 lb socket welding fittings correspond to Schedule 40 pipe.4 Bore dimensions for Class 6000 lb socket welding fittings correspond to Schedule 160 pipe.
Summary of coverage provided by B16.11-1991 and BS 3799:1974
Notes1 Plugs and bushes are not designated by Class and may be used for ratings up to Class 6000 lb.2 Swage nipples may be ordered in any combination of end preparation.
Dimensions and Tolerances❍ Dimensions . See pages 7-6 to 7-25 for HP fitting
dimensions.❍ Size Designations for Reducing Fittings .
❍ Tolerances specified in ASME/ANSI B16.11 areincluded in the dimension tables. BS 3799tolerances are substantially the same. Additionaltolerances are as follows:
steel socket weld or threaded fittings are mostcommonly manufactured from materialconforming to ASTM A182 (see page 4-6).
❍ BS 3799:1974 . Manufacturing requirements aresubstantially the same as for B16.11. Stainlesssteel grades specified are as indicated in thepressure/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. 3000 lb) - Size Markings may be omitted (least priority first fromabove list) if fitting size or shape imposes limits.
❍ Outlets . Socket weld and threaded outletscomply with B16.11 requirements, althoughB16.11 does not specifically cover outlets.
Pressure Ratings❍ General . The Class designation (e.g. 3000 lb) of
the high pressure fittings indicates the maximumcold working pressure.
❍ ASME/ANSI B16.11 Fittings . ASME/ANSIB16.11 specifies the allowable pressure/temperature rating to be that of seamless pipe ofthe equivalent material and wall thickness.
❍ BS 3799 Fittings . BS 3799 includes a table ofpressure/temperature rating. This is reproducedon page 7-4.
❍ Outlets . These fittings conform to the pressurerequirements of ASME/ANSI B16.11.
1
3
21
2
3
41 x 2 x 3where 1 is the largest nominal size
1 x 2 x 3 x 4where 1 and 3 are the larger nominal sizes
This subsection covers the pressure ratings for high pressure stainless steel socket weld aSee page 7-3 for ANSI/ASME B16.11 pressure rating requirements.
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 B16.11-1991. These agree substantially with BS
3799:1974. Exceptions are indicated in the following note.- BS 3799 does not cover NPS 4.
Dimensions and tolerances (based on ASME/ANSI B16.11-1991 and BS 3799:1974)
NPS
max
/ave
/min
Centre to Bottom ofSocket Socket
BoreDiameter
Bore Diameter of Fittings
Socket Wall
Thickness
Body Wall
Depth of
Socket90° Elbows,
Tees, &Crosses
45°Elbows
A A B D C G Jin mm in mm in mm in mm in mm in mm in mm
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 B16.11-1991. 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 minimum values, quoted because they differ from the ASME/ANSI B16.11 values.
Dimensions and tolerances (based on ASME/ANSI B16.11-1991 and BS 3799:1974)
NPS
max
/ave
/min Socket
BoreDiameter
Bore Diameter of Fittings
Socket Wall
Thickness
Depthof
Socket
Laying Lengths Cap End Wall
ThicknessCouplings HalfCouplings
B D C J E F Kin mm in mm in mm in mm in mm in mm in mm
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 B16.11-1991. 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 21/2 and 3 (not covered by ASME/ANSI B16.11).
Dimensions and tolerances (based on ASME/ANSI B16.11-1991 and BS 3799:1974)
NPS
max
/ave
/min
Centre to Bottom ofSocket Socket
BoreDiameter
Bore Diameter of Fittings
Socket Wall
Thickness
Body Wall
Depth of
Socket90° Elbows,
Tees, &Crosses
45°Elbows
A A B D C G Jin mm in mm in mm in mm in mm in mm in mm
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 6000 lb 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 B16.11-1991. 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 minimum values, quoted because they differ from the ASME/ANSI B16.11 values.
Dimensions and tolerances (based on ASME/ANSI B16.11-1991 and BS 3799:1974)
NPS
max
/ave
/min Socket
BoreDiameter
Bore Diameter of Fittings
Socket Wall
Thickness
Depthof
Socket
Laying Lengths Cap End Wall
ThicknessCouplings HalfCouplings
B D C J E F Kin mm in mm in mm in mm in mm in mm in mm
00 lb, 3000 lb and 6000 lb Threaded Fittings - ANS
eDimensions and tolerances shown are as specified in ASME/ANSI B16.11-1991. These agree substantially with BS 3799:1974. ExcBS 3799 does not cover any Class 2000 lb fittings, and Class 6000 lb fittings with NPS <1/2.BS 3799 dimensions G and L2 vary slightly from the ANSI values quoted. Dimension B is not specified in BS 3799.Dimension B is the length of perfect thread. L2 is the effective length of thread based on ANSI/ASME B1.20.1 (NTP), see page 10-1
ensions and tolerances (based on ASME/ANSI B16.11-1991 and BS 3799:1974)
NP
S
Centre to End Centre to End 45° OD of Band, min W
A C H2000 lb 3000 lb 6000 lb 2000 lb 3000 lb 6000 lb 2000 lb 3000 lb 6000 lb 2000 lbin mm in mm in mm in mm in mm in mm in mm in mm in mm in mm
Note- Dimensions and tolerances shown are as specified in ASME/ANSI B16.11-1991. These agree substantially with BS 3799:197- BS 3799 does not cover Class 6000 lb caps with NPS >2.- BS 3799 dimensions G and L2 vary slightly from the ANSI values quoted. Dimension B is not specified in BS 3799.- Dimension B is the length of perfect thread. L2 is the effective length of thread based on ANSI/ASME B1.20.1 (NTP), see pag
Dimensions and tolerances (based on ASME/ANSI B16.11-1991 and BS 3799:1974)
NP
S
End to End Couplings End to End Caps OD End
W P D3000 lb & 6000 lb 3000 lb 6000 lb 3000 lb 6000 lb 3000in mm in mm in mm in mm in mm in
esPlugs and bushes are not designated by Class and may be used at ratings up to Class 6000 lb.Dimensions and tolerances shown are as specified in ASME/ANSI B16.11-1991. These agree substantially with BS 3799:1974.
ensions and tolerances (based on ASME/ANSI B16.11-1991 and BS 3799:1974)
PS
Length min
Square Head Plugs Round Head PlugsHeight of Square
A B C D E L2in mm mm mm mm mm mm mm1/8 6 40 32 16 17 3.2 6.701/4 8 43 32 18 19 3.2 10.213/8 10 48 36 19 22 3.2 10.361/2 15 51 43 21 30 4.0 13.563/4 20 57 50 24 36 4.8 13.861 25 64 60 25 41 4.8 17.34
Note- Bore diameter D corresponds to schedule 40 pipe.
Socket weld union dimensions (BS 3799:1974)
NPS
3000 lb
Depth of Socket
min
Distance between Bottom of Sockets
min
Bore Diameter
of Sockets
min
Socket Wall
Thicknessmin
Bore Diameterof Union
Thickness of
Shoulder min
Width A/F of Nut min
Height of Nut min
S A B C D E F Gin mm mm mm mm mm mm mm mm mm1/8 6 10 17 10.7 3.2 6.8 3.2 32 161/4 8 10 17 14.1 3.3 9.2 3.2 32 183/8 10 10 17 17.6 3.5 12.5 3.2 36 191/2 15 10 18 21.8 4.1 15.5 4.0 41 213/4 20 13 20 27.4 4.3 21.0 4.8 50 241 25 13 26 34.1 5.0 26.5 4.8 60 25
Outlets may be used in place of welded or threaded tees to reduce costs and providemore flexible fabrication (‘run your pipe then weld on fittings’) while maintaining full pipestrength for all sizes, weights and schedules. The following pages contain the dimensiontables 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 B16.11 - Forged fitting, socket welding andthreaded, although outlet dimensions are notspecified in B16.11. Buttweld outlets aremanufactured to the requirements of ASME/ANSIB16.9 - Factory-made wrought steel buttweldingfittings, although outlet dimensions are notspecified in B16.9.
❍ Pressure Rating . Outlets are rated the same asseamless steel pipe, as defined in the AmericanNational Standard Codes for Pressure Piping,ANSI B31.1 and B31.3, the ASME Boiler andPressure Vessel Code. Refer to page 5-28 for asummary of pipe pressure rating calculations.
DesignationsIn order to reduce warehouse inventories, outlets of the same size are designed to be used with the a range ofrun pipe sizes. This can be done without causing a problem when welding because the resulting maximum gapbetween 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. 3,31/2, 4, 5, 6 or 8).
This subsection summarises requirements for 150 lb low pressure (LP) threaded fittingsas defined in BS 1740 : Part 1 : 1971 (as confirmed October 1983) - Wrought steel pipefittings (screwed BSP thread). Dimensions and tolerances are reproduced in the followingpages. Stainless steel low pressure threaded fittings are in general accordance with thesedimensions and tolerances.
Dimensions and TolerancesBS 1740 dimensions are as detailed in the following pages. Length tolerances are as specified below.
Threading RequirementsFittings manufactured to BS 1740 are threaded in accordance with BS 21:1985, Pipe threads for tubes andfittings where pressure-tight joints are made on the threads (metric dimensions). Summary dimensions areincluded below. For further information on BS 21 threads see page 10-10.
BS 1740 Tolerances
NPS Length of Socket Unions Length or Centre to Face Tolerances for Other Fittings
±mm ±mm<25 6 1.5
25 to 40 6 3.0>40 to 65 10 4.5>65 to 75 12 6.0>75 to 110 16 ->75 to 150 - 8.0
>150 - 10.0
Internal parallel and external taper thread
Nominal Size of Outlet
Minimum Outside Diameter
Minimum Outside Diameter of Body Behind External Thread
Minimum Inside Diameter of Body Behind Internal Thread
D E din mm mm mm mm1/8 6 15.0 9.8 8.61/4 8 18.5 13.3 11.43/8 10 22.0 16.8 15.01/2 15 27.0 21.1 18.63/4 20 32.5 26.6 24.11 25 39.5 33.4 30.3
Threaded tee, increasing on branch, dimensions (BS 1740:Part 1)
Nominal Size of Outlets(1 x 2)
Centre to Facemin
A Bin mm mm mm
3/8 x 1/2 10 x 15 32 271/2 x 3/4 15 x 20 35 321/2 x 1 15 x 25 43 353/4 x 1 20 x 25 43 381 x 11/4 25 x 32 51 441 x 11/2 25 x 40 52 44
11/4 x 11/2 32 x 40 52 4911/2 x 2 40 x 50 64 562 x 21/2 50 x 65 76 672 x 3 50 x 80 89 73
Threaded tee, reducing on branch and/or run, dimensions (BS 1740:Part 1)
Nominal Size of Outlets(1 x 2 x 3)
Centre to Face min
A Bin mm mm mm
3/4 x 1/2 x 1/2 20 x 15 x 15 32 353/4 x 1/2 x 3/4 20 x 15 x 20 35 351 x 3/4 x 1/2 25 x 20 x 15 35 431 x 3/4 x 3/4 25 x 20 x 20 38 431 x 3/4 x 1 25 x 20 x 25 43 43
11/4 x 1 x 3/4 32 x 25 x 20 41 5111/4 x 1 x 1 32 x 25 x 25 44 51
11/4 x 1 x 11/4 32 x 25 x 32 51 5111/2 x 1 x 1 40 x 25 x 25 44 52
Increasing on the Branch Tee Reducing on the Run and Branch Tee
1/4 x 1/8 8 x 6 253/8 x 1/8 10 x 6 303/8 x 1/4 10 x 8 291/2 x 1/8 15 x 6 411/2 x 1/4 15 x 8 401/2 x 3/8 15 x 10 383/4 x 1/4 20 x 8 443/4 x 3/8 20 x 10 433/4 x 1/2 20 x 15 411 x 1/4 25 x 8 541 x 3/8 25 x 10 521 x 1/2 25 x 15 511 x 3/4 25 x 20 49
11/4 x 3/8 32 x 10 60
Reducing Socket
11/4 x 1/2 32 x 15 5911/4 x 3/4 32 x 20 5711/4 x 1 32 x 25 5611/2 x 1/2 40 x 15 6511/2 x 3/4 40 x 20 6411/2 x 1 40 x 25 62
11/2 x 11/4 40 x 32 602 x 1/2 50 x 15 702 x 3/4 50 x 20 682 x 1 50 x 25 67
2 x 11/4 50 x 32 652 x 11/2 50 x 40 6421/2 x 1 65 x 25 76
21/2 x 11/4 65 x 32 7521/2 x 11/2 65 x 40 7321/2 x 2 65 x 50 713 x 1 80 x 25 86
3 x 11/4 80 x 32 843 x 11/2 80 x 40 833 x 2 80 x 50 81
3 x 21/2 80 x 65 794 x 11/2 100 x 40 1054 x 2 100 x 50 100
4 x 21/2 100 x 65 1004 x 3 100 x 80 985 x 3 125 x 80 1155 x 4 125 x 100 1156 x 3 150 x 80 1406 x 4 150 x 100 140
* This dimension is to be not less than the fitting allowance in BS 21 (see page 10-10).- Plugs in sizes 25 to 150 may be solid or hollow. The purchaser should stated which is required on the order.
A B C D K *in mm mm mm mm mm mm turns1/8 6 6.5 6 6 - - 23/41/4 8 9.7 6 9 - - 23/43/8 10 10.1 10 11 - - 23/41/2 15 13.2 10 13 - - 23/43/4 20 14.5 12 14 - - 23/41 25 16.8 12 17 22 4 23/4
External Thread for Basic Gauge Length plus Die Clearance, min
Thickness of Hexagon
Overall Length min
Diameter of Boremax
Width Across Flats of
Hexagon
L T A C Fin mm mm mm mm mm mm1/8 6 9.5 6 25 5.5 12.01/4 8 12.5 6 31 6.5 14.03/8 10 12.5 8 33 9.5 17.01/2 15 17.5 8 43 12.5 22.03/4 20 19.0 10 48 19.0 27.01 25 21.0 10 52 25.0 36.0