180° Long Radius Return Bend Dimensions
A return bend turns dat flow right around in just one fitting. Dat long radius pattern turns on a 1.5D centerline radius, givin' y'all the gentler flow path of two long radius elbows without no weld between 'em.
Where returns are used.
Heater coils, heat exchanger banks, tank farm hairpins, and any serpentine run dat has to fold back on itself. Usin' a single return bend 'stead of two welded elbows takes away a joint from a service dat's often hot, cyclic, and mighty awkward to inspect.
Center-to-center and back-to-face.
V is dat distance between the two run centerlines and W is the back-to-face dimension. Y'all gonna need both to lay out your coil spacing, so just pull 'em straight from the table 'stead of tryin' to figure 'em out from them elbow dimensions.
How To Read Dese Dimensions
ASME B16.9 covers the long radius 180 degree return, on the same 1.5D centerline radius as a long radius elbow. The center-to-center V and back-to-face W down below are its dimensions, and they are exactly what coil layout is built from, I tell you what.
- O.D.
- Outside diameterOutside diameter at the weldin' end, matchin' up perfect with the pipe it welds to.
- I.D.
- Inside diameterBore right through the fitting, set by dat wall thickness.
- T
- Wall thicknessNominal wall at the weldin' end, matched to the pipe schedule.
- V
- Center to centerRight between the centerlines of them two legs. Dat's exactly what sets your coil pitch.
- W
- Back to faceFrom the outside of the bend to the welding face.
113 sizes across 6 schedules · dimensions in inches, weights in pounds · ASME B16.9
Schedule STD
| Nom. Pipe Size | Outside Diameter O.D. | Inside Diameter I.D. | Wall Thickness T | Center to Center V | Back to Face W | Pipe Schedule Number | Approx. Weight in Pounds Lbs. |
|---|---|---|---|---|---|---|---|
| ½ | 0.84 | 0.622 | 0.109 | 3.00 | 1.88 | 40 | 0.32 |
| ¾ | 1.05 | 0.824 | 0.113 | 3.00 | 2.00 | 40 | 0.34 |
| 1 | 1.32 | 1.049 | 0.133 | 3.00 | 2.19 | 40 | 0.74 |
| 1¼ | 1.66 | 1.380 | 0.140 | 3.75 | 2.75 | 40 | 1.10 |
| 1½ | 1.90 | 1.610 | 0.145 | 4.50 | 3.25 | 40 | 1.60 |
| 2 | 2.38 | 2.067 | 0.154 | 6.00 | 4.19 | 40 | 3.20 |
| 2½ | 2.88 | 2.469 | 0.203 | 7.50 | 5.19 | 40 | 6.10 |
| 3 | 3.50 | 3.068 | 0.216 | 9.00 | 6.25 | 40 | 9.40 |
| 3½ | 4.00 | 3.548 | 0.226 | 10.50 | 7.25 | 40 | 12.80 |
| 4 | 4.50 | 4.026 | 0.237 | 12.00 | 8.25 | 40 | 17.50 |
| 5 | 5.56 | 5.047 | 0.258 | 15.00 | 10.31 | 40 | 29.30 |
| 6 | 6.62 | 6.065 | 0.280 | 18.00 | 12.31 | 40 | 47.00 |
| 8 | 8.62 | 7.981 | 0.322 | 24.00 | 16.31 | 40 | 87.00 |
| 10 | 10.75 | 10.020 | 0.365 | 30.00 | 20.38 | 40 | 164.00 |
| 12 | 12.75 | 12.000 | 0.375 | 36.00 | 24.38 | * | 237.00 |
| 14 | 14.00 | 13.250 | 0.375 | 42.00 | 28.00 | 30 | 311.00 |
| 16 | 16.00 | 15.250 | 0.375 | 48.00 | 32.00 | 30 | 408.00 |
| 18 | 18.00 | 17.250 | 0.375 | 54.00 | 36.00 | * | 514.00 |
| 20 | 20.00 | 19.250 | 0.375 | 60.00 | 40.00 | 20 | 636.00 |
| 24 | 24.00 | 23.250 | 0.375 | 72.00 | 48.00 | 20 | 908.00 |
Schedule XS
| Nom. Pipe Size | Outside Diameter O.D. | Inside Diameter I.D. | Wall Thickness T | Center to Center V | Back to Face W | Pipe Schedule Number | Approx. Weight in Pounds Lbs. |
|---|---|---|---|---|---|---|---|
| ½ | 0.84 | 0.546 | 0.147 | 3.00 | 1.88 | 80 | 0.45 |
| ¾ | 1.05 | 0.742 | 0.154 | 3.00 | 2.00 | 80 | 0.52 |
| 1 | 1.32 | 0.957 | 0.179 | 3.00 | 2.19 | 80 | 0.97 |
| 1¼ | 1.66 | 1.278 | 0.191 | 3.75 | 2.75 | 80 | 1.60 |
| 1½ | 1.90 | 1.500 | 0.200 | 4.50 | 3.25 | 80 | 2.20 |
| 2 | 2.38 | 1.939 | 0.218 | 6.00 | 4.19 | 80 | 4.10 |
| 2½ | 2.88 | 2.323 | 0.276 | 7.50 | 5.19 | 80 | 7.70 |
| 3 | 3.50 | 2.900 | 0.300 | 9.00 | 6.25 | 80 | 12.40 |
| 3½ | 4.00 | 3.364 | 0.318 | 10.50 | 7.25 | 80 | 17.10 |
| 4 | 4.50 | 3.826 | 0.337 | 12.00 | 8.25 | 80 | 24.10 |
| 5 | 5.56 | 4.813 | 0.375 | 15.00 | 10.31 | 80 | 41.70 |
| 6 | 6.62 | 5.761 | 0.432 | 18.00 | 12.31 | 80 | 68.20 |
| 8 | 8.62 | 7.625 | 0.500 | 24.00 | 16.31 | 80 | 140.00 |
| 10 | 10.75 | 9.750 | 0.500 | 30.00 | 20.38 | 60 | 217.00 |
| 12 | 12.75 | 11.750 | 0.500 | 36.00 | 24.38 | * | 311.00 |
| 14 | 14.00 | 13.000 | 0.500 | 42.00 | 28.00 | * | 400.00 |
| 16 | 16.00 | 15.000 | 0.500 | 48.00 | 32.00 | 40 | 540.00 |
| 18 | 18.00 | 17.000 | 0.500 | 54.00 | 36.00 | * | 686.00 |
| 20 | 20.00 | 19.000 | 0.500 | 60.00 | 40.00 | 30 | 840.00 |
| 24 | 24.00 | 23.000 | 0.500 | 72.00 | 48.00 | * | 1210.00 |
Schedule 40
| Nom. Pipe Size | Outside Diameter O.D. | Inside Diameter I.D. | Wall Thickness T | Center to Center V | Back to Face W | Pipe Schedule Number | Approx. Weight in Pounds Lbs. |
|---|---|---|---|---|---|---|---|
| ½ | 0.84 | 0.622 | 0.109 | 3.00 | 1.88 | 40 | 0.32 |
| ¾ | 1.05 | 0.824 | 0.113 | 3.00 | 2.00 | 40 | 0.34 |
| 1 | 1.32 | 1.054 | 0.133 | 3.00 | 2.19 | 40 | 0.74 |
| 1¼ | 1.66 | 1.380 | 0.140 | 3.75 | 2.75 | 40 | 1.10 |
| 1½ | 1.90 | 1.610 | 0.145 | 4.50 | 3.25 | 40 | 1.60 |
| 2 | 2.38 | 2.072 | 0.154 | 6.00 | 4.19 | 40 | 3.20 |
| 2½ | 2.88 | 2.474 | 0.203 | 7.50 | 5.19 | 40 | 6.10 |
| 3 | 3.50 | 3.068 | 0.216 | 9.00 | 6.25 | 40 | 9.40 |
| 3½ | 4.00 | 3.548 | 0.226 | 10.50 | 7.25 | 40 | 12.80 |
| 4 | 4.50 | 4.026 | 0.237 | 12.00 | 8.25 | 40 | 17.50 |
| 5 | 5.56 | 5.044 | 0.258 | 15.00 | 10.31 | 40 | 29.30 |
| 6 | 6.62 | 6.060 | 0.280 | 18.00 | 12.31 | 40 | 47.00 |
| 8 | 8.62 | 7.976 | 0.322 | 24.00 | 16.31 | 40 | 87.00 |
| 10 | 10.75 | 10.020 | 0.365 | 30.00 | 20.38 | 40 | 164.00 |
| 12 | 12.75 | 11.938 | 0.406 | 36.00 | 24.38 | 40 | 240.00 |
| 14 | 14.00 | 13.124 | 0.438 | 42.00 | 28.00 | 40 | 315.00 |
| 16 | 16.00 | 15.000 | 0.500 | 48.00 | 32.00 | 40 | 410.00 |
| 18 | 18.00 | 16.876 | 0.562 | 54.00 | 36.00 | 40 | 520.00 |
| 20 | 20.00 | 18.812 | 0.594 | 60.00 | 40.00 | 40 | 640.00 |
| 24 | 24.00 | 22.624 | 0.688 | 72.00 | 48.00 | 40 | 915.00 |
Schedule 80
| Nom. Pipe Size | Outside Diameter O.D. | Inside Diameter I.D. | Wall Thickness T | Center to Center V | Back to Face W | Pipe Schedule Number | Approx. Weight in Pounds Lbs. |
|---|---|---|---|---|---|---|---|
| ½ | 0.84 | 0.546 | 0.147 | 3.00 | 1.88 | 80 | 0.45 |
| ¾ | 1.05 | 0.742 | 0.154 | 3.00 | 2.00 | 80 | 0.52 |
| 1 | 1.32 | 0.962 | 0.179 | 3.00 | 2.19 | 80 | 0.97 |
| 1¼ | 1.66 | 1.278 | 0.191 | 3.75 | 2.75 | 80 | 1.60 |
| 1½ | 1.90 | 1.500 | 0.200 | 4.50 | 3.25 | 80 | 2.20 |
| 2 | 2.38 | 1.944 | 0.218 | 6.00 | 4.19 | 80 | 4.10 |
| 2½ | 2.88 | 2.328 | 0.276 | 7.50 | 5.19 | 80 | 7.70 |
| 3 | 3.50 | 2.900 | 0.300 | 9.00 | 6.25 | 80 | 12.40 |
| 3½ | 4.00 | 3.364 | 0.318 | 10.50 | 7.25 | 80 | 17.10 |
| 4 | 4.50 | 3.826 | 0.337 | 12.00 | 8.25 | 80 | 24.10 |
| 5 | 5.56 | 4.810 | 0.375 | 15.00 | 10.31 | 80 | 41.70 |
| 6 | 6.62 | 5.756 | 0.432 | 18.00 | 12.31 | 80 | 68.20 |
| 8 | 8.62 | 7.620 | 0.500 | 24.00 | 16.31 | 80 | 140.00 |
| 10 | 10.75 | 9.562 | 0.594 | 30.00 | 20.38 | 80 | 220.00 |
| 12 | 12.75 | 11.374 | 0.688 | 36.00 | 24.38 | 80 | 315.00 |
| 14 | 14.00 | 12.500 | 0.750 | 42.00 | 28.00 | 80 | 410.00 |
| 16 | 16.00 | 14.312 | 0.844 | 48.00 | 32.00 | 80 | 550.00 |
| 18 | 18.00 | 16.124 | 0.938 | 54.00 | 36.00 | 80 | 695.00 |
| 20 | 20.00 | 17.938 | 1.031 | 60.00 | 40.00 | 80 | 850.00 |
| 24 | 24.00 | 21.562 | 1.219 | 72.00 | 48.00 | 80 | 1225.00 |
Schedule 160
| Nom. Pipe Size | Outside Diameter O.D. | Inside Diameter I.D. | Wall Thickness T | Center to Center V | Back to Face W | Pipe Schedule Number | Approx. Weight in Pounds Lbs. |
|---|---|---|---|---|---|---|---|
| ½ | 0.84 | 0.464 | 0.188 | 3.00 | 1.88 | 160 | 0.40 |
| ¾ | 1.05 | 0.612 | 0.219 | 3.00 | 2.00 | 160 | 0.43 |
| 1 | 1.32 | 0.820 | 0.250 | 3.00 | 2.19 | 160 | 0.93 |
| 1¼ | 1.66 | 1.160 | 0.250 | 3.75 | 2.75 | 160 | 1.38 |
| 1½ | 1.90 | 1.338 | 0.281 | 4.50 | 3.25 | 160 | 2.00 |
| 2 | 2.38 | 1.692 | 0.344 | 6.00 | 4.19 | 160 | 4.00 |
| 2½ | 2.88 | 2.130 | 0.375 | 7.50 | 5.19 | 160 | 7.63 |
| 3 | 3.50 | 2.624 | 0.438 | 9.00 | 6.25 | 160 | 11.75 |
| 4 | 4.50 | 3.438 | 0.531 | 12.00 | 8.25 | 160 | 21.88 |
| 5 | 5.56 | 4.310 | 0.625 | 15.00 | 10.31 | 160 | 36.63 |
| 6 | 6.62 | 5.182 | 0.719 | 18.00 | 12.31 | 160 | 58.75 |
| 8 | 8.62 | 6.808 | 0.906 | 24.00 | 16.31 | 160 | 108.75 |
| 10 | 10.75 | 8.500 | 1.125 | 30.00 | 20.38 | 160 | 205.00 |
| 12 | 12.75 | 10.126 | 1.312 | 36.00 | 24.38 | 160 | 296.25 |
| 14 | 14.00 | 11.188 | 1.406 | 42.00 | 28.00 | 160 | 388.75 |
| 16 | 16.00 | 12.812 | 1.594 | 48.00 | 32.00 | 160 | 510.00 |
| 18 | 18.00 | 14.438 | 1.781 | 54.00 | 36.00 | 160 | 642.50 |
| 20 | 20.00 | 16.062 | 1.969 | 60.00 | 40.00 | 160 | 795.00 |
| 24 | 24.00 | 19.312 | 2.344 | 72.00 | 48.00 | 160 | 1135.00 |
Schedule XXS
| Nom. Pipe Size | Outside Diameter O.D. | Inside Diameter I.D. | Wall Thickness T | Center to Center V | Back to Face W | Pipe Schedule Number | Approx. Weight in Pounds Lbs. |
|---|---|---|---|---|---|---|---|
| ½ | 0.84 | 0.252 | 0.294 | 3.00 | 1.88 | * | 0.44 |
| ¾ | 1.05 | 0.434 | 0.308 | 3.00 | 2.00 | * | 0.47 |
| 1 | 1.32 | 0.604 | 0.358 | 3.00 | 2.19 | * | 1.02 |
| 1¼ | 1.66 | 0.896 | 0.382 | 3.75 | 2.75 | * | 1.51 |
| 1½ | 1.90 | 1.100 | 0.400 | 4.50 | 3.25 | * | 2.20 |
| 2 | 2.38 | 1.508 | 0.436 | 6.00 | 4.19 | * | 4.40 |
| 2½ | 2.88 | 1.776 | 0.552 | 7.50 | 5.19 | * | 8.39 |
| 3 | 3.50 | 2.300 | 0.600 | 9.00 | 6.25 | * | 12.93 |
| 4 | 4.50 | 3.152 | 0.674 | 12.00 | 8.25 | * | 24.06 |
| 5 | 5.56 | 4.060 | 0.750 | 15.00 | 10.31 | * | 40.29 |
| 6 | 6.62 | 4.892 | 0.864 | 18.00 | 12.31 | * | 64.63 |
| 8 | 8.62 | 6.870 | 0.875 | 24.00 | 16.31 | * | 119.63 |
| 10 | 10.75 | 8.750 | 1.000 | 30.00 | 20.38 | 140 | 225.50 |
| 12 | 12.75 | 10.750 | 1.000 | 36.00 | 24.38 | 120 | 325.88 |
Materials We Supply
180° Long Radius Return Bend to ASME B16.9 in the grades below. Tell us the service and we'll confirm the right one for y'all.
| Material | Specification | Typical Service |
|---|---|---|
| Carbon Steel | ASTM A234 WPB / WPC | General process, steam, oil and gas gathering and utility lines |
| Low-Temp Carbon Steel | ASTM A420 WPL6 | Cold service to −50°F; LNG and northern pipeline work |
| Chrome-Moly Alloy | ASTM A234 WP11 / WP22 / WP91 | Elevated temperature; refinery heaters, power plant steam |
| Stainless Steel | ASTM A403 WP304/304L, WP316/316L | Corrosive service, chemical, food and beverage, water treatment |
| Duplex & Super Duplex | ASTM A815 UNS S31803 / S32750 | Chloride and seawater service, offshore, desalination |
Questions Folks Ask Us
What is a 180 degree return bend used for?
Reversin' flow direction in a single fittin', typically in heater coils, exchanger banks, and serpentine runs. It does the job of two 90° elbows without havin' to weld between 'em.
What are the V and W dimensions?
Now, V is dat centerline-to-centerline between the two legs, which sets up your coil spacing. W is the back-to-face dimension, runnin' from the outside of the bend right to the weldin' face. You can find both of 'em in them tables up above, yessir.
Can I use two 90° elbows instead of a return bend?
Functionally yes, but it adds a weld in a spot dat's often hot, cyclic, and mighty hard to inspect. Where a return bend fits dat required spacing, it's the more robust choice, I tell you what.
