Long Radius Pipe Bends & Return Dimensions (Pipe U Bends)

  • For Wrought Product (WP) Dimension is covered in
    • ASME B16.9- which is standard for Factory-made Wrought Butt-welding Fittings for size NPS 1⁄₂ to NPS 48” and
    • And B16.28- which is standard for Wrought Steel Butt-Welding Short Radius Elbows and Returns for size NPS 1⁄₂ to NPS 24”
180 degree returns bend dimension
Nominal Pipe Size Outside Diameter Back to Face Center to Center
Inch. OD A B C D
1/2 21.3 48 – 76 –
3/4 26.7 43 – 57 –
1 33.4 56 41 76 51
1 1/4 42.2 70 52 95 64
1 1/2 48.3 83 62 114 76
2 60.3 106 81 152 102
2 1/2 73 132 100 191 127
3 88.9 159 121 229 152
3 1/2 101.6 184 140 267 178
4 114.3 210 159 305 203
5 141.3 262 197 381 254
6 168.3 313 237 457 305
8 219.1 414 313 610 406
10 273.1 518 391 762 508
12 323.9 619 467 914 610
14 355.6 711 533 1067 711
16 406.4 813 610 1219 813
18 457.2 914 686 1372 914
20 508 1016 762 1524 1016
22 559 1118 838 1676 1118
24 610 1219 914 1829 1219
All dimensions are in mm

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Pipe Fittings Dimensions Tolerance as per ASME B16.9

Dimension Tolerance for pipe fittings

Pipe FIttings Quiz – Test yourself, Take This Quiz

NOMINAL PIPE SIZE ALL FITTINGS ALL FITTINGS ALL FITTINGS ELBOWS AND TEES 180 DEG RETURN BENDS 180 DEG RETURN BENDS 180 DEG RETURN BENDS REDUCERS CAPS
NPS O.D. at Bevel (1), (2) I.D. at End
(1), (3), (4) 		Wall Thickness (3) Centre-to-End Dimension A,B,C,M Centre-to-Centre O Back-to-Face K Alignment of Ends U Overall Length H Overall Length E
½ to 2½ 0.06
-0.03 		0.03 Not less than 87.5% of nominal thickness 0.06 0.25 0.25 0.03 0.06 0.12
3 to 3 ½ 0.06 0.06 0.06 0.25 0.25 0.03 0.06 0.12
4 0.06 0.06 0.06 0.25 0.25 0.03 0.06 0.12
5 to 8 0.09
-0.06 		0.06 0.06 0.25 0.25 0.03 0.06 0.25
10 to 18 0.16
-0.12 		0.12 0.09 0.38 0.25 0.06 0.09 0.25
20 to 24 0.25
-0.19 		0.19 0.09 0.38 0.25 0.06 0.09 0.25
26 to 30 0.25
-0.19 		0.19 0.12 … … … 0.19 0.38
32 to 48 0.25
-0.19 		0.19 0.19 … … … 0.19 0.38
NOMINAL PIPE SIZE NPS ANGULARITY TOLERANCES ANGULARITY TOLERANCES ALL DIMENSIONS ARE GIVEN IN INCHES. TOLERANCES ARE EQUAL PLUS AND MINUS EXCEPT AS NOTED.
Off Angle Q Off Plane P (1) Out-of-round is the sum of absolute values of plus and minus tolerance.
(2) This tolerance may not apply in localized areas of formed fittings where increased wall thickness is required to meet design requirements of ASME B16.9.
(3) The inside diameter and the nominal wall thicknesses at ends are to be specified by the purchaser.
(4) Unless otherwise specified by the purchaser, these tolerances apply to the nominal inside diameter, which equals the difference between the nominal outside diameter and twice the nominal wall thickness.
½ to 4 0.03 0.06
5 to 8 0.06 0.12
10 to 12 0.09 0.19
14 to 16 0.09 0.25
18 to 24 0.12 0.38
26 to 30 0.19 0.38
32 to 42 0.19 0.50
44 to 48 0.18 0.75

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About Author

Varun Patel, B.E – Mechanical, PMP®

19+ years of experience in the oil and gas sector, specializing in project management, contracts, project control, project coordination, QA/QC and inspection of large-scale Greenfield and Brownfield Projects such as Refinery, Petrochemical, Wellhead production, and Process platform. Proven track record of delivering large-scale projects while ensuring adherence to safety and quality standards. Skilled in leading and mentoring cross-functional teams and resolving technical issues to achieve successful project outcomes.