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
Nominal Pipe SizeOutside DiameterBack to FaceCenter to Center
Inch.ODABCD
1/221.34876
3/426.74357
133.456417651
1 1/442.270529564
1 1/248.3836211476
260.310681152102
2 1/273132100191127
388.9159121229152
3 1/2101.6184140267178
4114.3210159305203
5141.3262197381254
6168.3313237457305
8219.1414313610406
10273.1518391762508
12323.9619467914610
14355.67115331067711
16406.48136101219813
18457.29146861372914
20508101676215241016
22559111883816761118
24610121991418291219
All dimensions are in mm

Pipe Fittings Dimensions Tolerance as per ASME B16.9

Dimension Tolerance
Piping Courses
NOMINAL PIPE SIZEALL FITTINGSALL FITTINGSALL FITTINGSELBOWS AND TEES180 DEG RETURN BENDS180 DEG RETURN BENDS180 DEG RETURN BENDSREDUCERSCAPS
NPSO.D. at Bevel (1), (2)I.D. at End
(1), (3), (4)
Wall Thickness (3)Centre-to-End Dimension A,B,C,MCentre-to-Centre OBack-to-Face KAlignment of Ends UOverall Length HOverall Length E
½ to 2½0.06
-0.03
0.03Not less than 87.5% of nominal thickness0.060.250.250.030.060.12
3 to 3 ½0.060.060.060.250.250.030.060.12
40.060.060.060.250.250.030.060.12
5 to 80.09
-0.06
0.060.060.250.250.030.060.25
10 to 180.16
-0.12
0.120.090.380.250.060.090.25
20 to 240.25
-0.19
0.190.090.380.250.060.090.25
26 to 300.25
-0.19
0.190.120.190.38
32 to 480.25
-0.19
0.190.190.190.38
NOMINAL PIPE SIZE NPSANGULARITY TOLERANCESANGULARITY TOLERANCESALL DIMENSIONS ARE GIVEN IN INCHES. TOLERANCES ARE EQUAL PLUS AND MINUS EXCEPT AS NOTED.
Off Angle QOff 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 40.030.06
5 to 80.060.12
10 to 120.090.19
14 to 160.090.25
18 to 240.120.38
26 to 300.190.38
32 to 420.190.50
44 to 480.180.75

 

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