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”
| 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 | |||||
Pipe Fittings Dimensions Tolerance as per ASME B16.9
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| 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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