90° Long Radius Elbow Dimensions
Dat long radius 90° elbow is your everyday default turn in industrial pipin'. Its centerline radius is 1.5 times the nominal pipe diameter, gentle enough to keep dat pressure drop and erosion mighty low, while still fittin' normal pipe rack spacin'. When a drawin' just says "90 ell" with nothin' else added, I reckon this is almost always the part they mean.
Why 1.5D is the default.
The wider sweep of a long radius elbow means less turbulence, lower pressure loss, and less wall erosion than a short radius turn. In abrasive or high-velocity service dat difference shows up directly as service life, which is why most pipin' specs call for long radius unless space forces the tighter option.
Readin' the center-to-end.
The C dimension is measured from the theoretical intersection of the two centerlines right to the face of either end. It's the number y'all need for spool fabrication and takeoff, and on a standard long radius elbow it equals 1.5 × NPS.
How To Read Dese Dimensions
ASME B16.9 is the dimensional standard for factory-made wrought buttweldin' fittin's, and the long radius elbow is its centrepiece: the 1.5D centerline radius, the center-to-end C down below, and the tolerances on both come right from it. Weldin' ends are prepared to ASME B16.25, yessir.
- 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.
- C
- Center to endFrom the theoretical intersection of the two centerlines to the welding face. On a long radius 90 it equals 1.5 times the nominal size.
121 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 End C | Pipe Schedule Number | Approx. Weight in Pounds Lbs. |
|---|---|---|---|---|---|---|
| ½ | 0.84 | 0.622 | 0.109 | 1.50 | 40 | 0.16 |
| ¾ | 1.05 | 0.824 | 0.113 | 1.50 | 40 | 0.17 |
| 1 | 1.32 | 1.049 | 0.133 | 1.50 | 40 | 0.40 |
| 1¼ | 1.66 | 1.380 | 0.140 | 1.88 | 40 | 0.55 |
| 1½ | 1.90 | 1.610 | 0.145 | 2.25 | 40 | 0.80 |
| 2 | 2.38 | 2.067 | 0.154 | 3.00 | 40 | 1.60 |
| 2½ | 2.88 | 2.469 | 0.203 | 3.75 | 40 | 3.20 |
| 3 | 3.50 | 3.068 | 0.216 | 4.50 | 40 | 4.80 |
| 3½ | 4.00 | 3.548 | 0.226 | 5.25 | 40 | 6.60 |
| 4 | 4.50 | 4.026 | 0.237 | 6.00 | 40 | 8.90 |
| 5 | 5.56 | 5.047 | 0.258 | 7.50 | 40 | 15.10 |
| 6 | 6.62 | 6.065 | 0.280 | 9.00 | 40 | 24.00 |
| 8 | 8.62 | 7.981 | 0.322 | 12.00 | 40 | 47.80 |
| 10 | 10.75 | 10.020 | 0.365 | 15.00 | 40 | 83.40 |
| 12 | 12.75 | 12.000 | 0.375 | 18.00 | * | 123.00 |
| 14 | 14.00 | 13.250 | 0.375 | 21.00 | 30 | 155.00 |
| 16 | 16.00 | 15.250 | 0.375 | 24.00 | 30 | 206.00 |
| 18 | 18.00 | 17.250 | 0.375 | 27.00 | * | 262.00 |
| 20 | 20.00 | 19.250 | 0.375 | 30.00 | 20 | 324.00 |
| 24 | 24.00 | 23.250 | 0.375 | 36.00 | 20 | 466.00 |
| 30 | 30.00 | 29.250 | 0.375 | 45.00 | * | 720.00 |
| 36 | 36.00 | 35.250 | 0.375 | 54.00 | * | 1039.00 |
| 42 | 42.00 | 41.250 | 0.375 | 63.00 | * | 1420.00 |
| 48 | 48.00 | 47.250 | 0.375 | 72.00 | * | 2000.00 |
Schedule XS
| Nom. Pipe Size | Outside Diameter O.D. | Inside Diameter I.D. | Wall Thickness T | Center to End C | Pipe Schedule Number | Approx. Weight in Pounds Lbs. |
|---|---|---|---|---|---|---|
| ½ | 0.84 | 0.546 | 0.147 | 1.50 | 80 | 0.26 |
| ¾ | 1.05 | 0.742 | 0.154 | 1.50 | 80 | 0.29 |
| 1 | 1.32 | 0.957 | 0.179 | 1.50 | 80 | 0.48 |
| 1¼ | 1.66 | 1.278 | 0.191 | 1.88 | 80 | 0.79 |
| 1½ | 1.90 | 1.500 | 0.200 | 2.25 | 80 | 1.20 |
| 2 | 2.38 | 1.939 | 0.218 | 3.00 | 80 | 2.10 |
| 2½ | 2.88 | 2.323 | 0.276 | 3.75 | 80 | 3.80 |
| 3 | 3.50 | 2.900 | 0.300 | 4.50 | 80 | 6.30 |
| 3½ | 4.00 | 3.364 | 0.318 | 5.25 | 80 | 8.60 |
| 4 | 4.50 | 3.826 | 0.337 | 6.00 | 80 | 12.50 |
| 5 | 5.56 | 4.813 | 0.375 | 7.50 | 80 | 21.20 |
| 6 | 6.62 | 5.761 | 0.432 | 9.00 | 80 | 34.40 |
| 8 | 8.62 | 7.625 | 0.500 | 12.00 | 80 | 71.30 |
| 10 | 10.75 | 9.750 | 0.500 | 15.00 | 60 | 111.00 |
| 12 | 12.75 | 11.750 | 0.500 | 18.00 | * | 158.00 |
| 14 | 14.00 | 13.000 | 0.500 | 21.00 | * | 201.00 |
| 16 | 16.00 | 15.000 | 0.500 | 24.00 | 40 | 270.00 |
| 18 | 18.00 | 17.000 | 0.500 | 27.00 | * | 348.00 |
| 20 | 20.00 | 19.000 | 0.500 | 30.00 | 30 | 422.00 |
| 24 | 24.00 | 23.000 | 0.500 | 36.00 | * | 604.00 |
| 30 | 30.00 | 29.000 | 0.500 | 45.00 | 20 | 997.00 |
| 36 | 36.00 | 35.000 | 0.500 | 54.00 | 20 | 1380.00 |
| 42 | 42.00 | 41.000 | 0.500 | 63.00 | * | 1880.00 |
| 48 | 48.00 | 47.000 | 0.500 | 72.00 | * | 2502.00 |
Schedule 40
| Nom. Pipe Size | Outside Diameter O.D. | Inside Diameter I.D. | Wall Thickness T | Center to End C | Pipe Schedule Number | Approx. Weight in Pounds Lbs. |
|---|---|---|---|---|---|---|
| ½ | 0.84 | 0.622 | 0.109 | 1.50 | 40 | 0.16 |
| ¾ | 1.05 | 0.824 | 0.113 | 1.50 | 40 | 0.17 |
| 1 | 1.32 | 1.054 | 0.133 | 1.50 | 40 | 0.40 |
| 1¼ | 1.66 | 1.380 | 0.140 | 1.88 | 40 | 0.55 |
| 1½ | 1.90 | 1.610 | 0.145 | 2.25 | 40 | 0.80 |
| 2 | 2.38 | 2.072 | 0.154 | 3.00 | 40 | 1.60 |
| 2½ | 2.88 | 2.474 | 0.203 | 3.75 | 40 | 3.20 |
| 3 | 3.50 | 3.068 | 0.216 | 4.50 | 40 | 4.80 |
| 3½ | 4.00 | 3.548 | 0.226 | 5.25 | 40 | 6.60 |
| 4 | 4.50 | 4.026 | 0.237 | 6.00 | 40 | 8.90 |
| 5 | 5.56 | 5.044 | 0.258 | 7.50 | 40 | 15.10 |
| 6 | 6.62 | 6.060 | 0.280 | 9.00 | 40 | 24.00 |
| 8 | 8.62 | 7.976 | 0.322 | 12.00 | 40 | 47.80 |
| 10 | 10.75 | 10.020 | 0.365 | 15.00 | 40 | 83.40 |
| 12 | 12.75 | 11.938 | 0.406 | 18.00 | 40 | 123.00 |
| 14 | 14.00 | 13.124 | 0.438 | 21.00 | 40 | 155.00 |
| 16 | 16.00 | 15.000 | 0.500 | 24.00 | 40 | 206.00 |
| 18 | 18.00 | 16.876 | 0.562 | 27.00 | 40 | 262.00 |
| 20 | 20.00 | 18.812 | 0.594 | 30.00 | 40 | 324.00 |
| 24 | 24.00 | 22.624 | 0.688 | 36.00 | 40 | 466.00 |
Schedule 80
| Nom. Pipe Size | Outside Diameter O.D. | Inside Diameter I.D. | Wall Thickness T | Center to End C | Pipe Schedule Number | Approx. Weight in Pounds Lbs. |
|---|---|---|---|---|---|---|
| ½ | 0.84 | 0.546 | 0.147 | 1.50 | 80 | 0.26 |
| ¾ | 1.05 | 0.742 | 0.154 | 1.50 | 80 | 0.29 |
| 1 | 1.32 | 0.962 | 0.179 | 1.50 | 80 | 0.48 |
| 1¼ | 1.66 | 1.278 | 0.191 | 1.88 | 80 | 0.79 |
| 1½ | 1.90 | 1.500 | 0.200 | 2.25 | 80 | 1.20 |
| 2 | 2.38 | 1.944 | 0.218 | 3.00 | 80 | 2.10 |
| 2½ | 2.88 | 2.328 | 0.276 | 3.75 | 80 | 3.80 |
| 3 | 3.50 | 2.900 | 0.300 | 4.50 | 80 | 6.30 |
| 3½ | 4.00 | 3.364 | 0.318 | 5.25 | 80 | 8.60 |
| 4 | 4.50 | 3.826 | 0.337 | 6.00 | 80 | 12.50 |
| 5 | 5.56 | 4.810 | 0.375 | 7.50 | 80 | 21.20 |
| 6 | 6.62 | 5.756 | 0.432 | 9.00 | 80 | 34.40 |
| 8 | 8.62 | 7.620 | 0.500 | 12.00 | 80 | 71.30 |
| 10 | 10.75 | 9.562 | 0.594 | 15.00 | 80 | 111.00 |
| 12 | 12.75 | 11.374 | 0.688 | 18.00 | 80 | 158.00 |
| 14 | 14.00 | 12.500 | 0.750 | 21.00 | 80 | 201.00 |
| 16 | 16.00 | 14.312 | 0.844 | 24.00 | 80 | 270.00 |
| 18 | 18.00 | 16.124 | 0.938 | 27.00 | 80 | 348.00 |
| 20 | 20.00 | 17.938 | 1.031 | 30.00 | 80 | 422.00 |
| 24 | 24.00 | 21.562 | 1.219 | 36.00 | 80 | 604.00 |
Schedule 160
| Nom. Pipe Size | Outside Diameter O.D. | Inside Diameter I.D. | Wall Thickness T | Center to End C | Pipe Schedule Number | Approx. Weight in Pounds Lbs. |
|---|---|---|---|---|---|---|
| ½ | 0.84 | 0.464 | 0.188 | 1.50 | 160 | 0.60 |
| ¾ | 1.05 | 0.612 | 0.219 | 1.50 | 160 | 0.60 |
| 1 | 1.32 | 0.820 | 0.250 | 1.50 | 160 | 0.60 |
| 1¼ | 1.66 | 1.160 | 0.250 | 1.88 | 160 | 1.00 |
| 1½ | 1.90 | 1.338 | 0.281 | 2.25 | 160 | 1.80 |
| 2 | 2.38 | 1.692 | 0.344 | 3.00 | 160 | 3.20 |
| 2½ | 2.88 | 2.130 | 0.375 | 3.75 | 160 | 6.00 |
| 3 | 3.50 | 2.624 | 0.438 | 4.50 | 160 | 10.00 |
| 4 | 4.50 | 3.438 | 0.531 | 6.00 | 160 | 22.00 |
| 5 | 5.56 | 4.310 | 0.625 | 7.50 | 160 | 33.00 |
| 6 | 6.62 | 5.182 | 0.719 | 9.00 | 160 | 62.00 |
| 8 | 8.62 | 6.808 | 0.906 | 12.00 | 160 | 122.00 |
| 10 | 10.75 | 8.500 | 1.125 | 15.00 | 160 | 270.00 |
| 12 | 12.75 | 10.126 | 1.312 | 18.00 | 160 | 460.00 |
| 14 | 14.00 | 11.188 | 1.406 | 21.00 | 160 | 563.00 |
| 16 | 16.00 | 12.812 | 1.594 | 24.00 | 160 | 825.00 |
| 18 | 18.00 | 14.438 | 1.781 | 27.00 | 160 | 1240.00 |
| 20 | 20.00 | 16.062 | 1.969 | 30.00 | 160 | 1510.00 |
| 24 | 24.00 | 19.312 | 2.344 | 36.00 | 160 | 1760.00 |
Schedule XXS
| Nom. Pipe Size | Outside Diameter O.D. | Inside Diameter I.D. | Wall Thickness T | Center to End C | Pipe Schedule Number | Approx. Weight in Pounds Lbs. |
|---|---|---|---|---|---|---|
| ½ | 0.84 | 0.252 | 0.294 | 1.50 | * | 0.30 |
| ¾ | 1.05 | 0.434 | 0.308 | 1.50 | * | 0.30 |
| 1 | 1.32 | 0.604 | 0.358 | 1.50 | * | 0.80 |
| 1¼ | 1.66 | 0.896 | 0.382 | 1.88 | * | 1.40 |
| 1½ | 1.90 | 1.100 | 0.400 | 2.25 | * | 2.00 |
| 2 | 2.38 | 1.508 | 0.436 | 3.00 | * | 3.90 |
| 2½ | 2.88 | 1.776 | 0.552 | 3.75 | * | 6.80 |
| 3 | 3.50 | 2.300 | 0.600 | 4.50 | * | 11.30 |
| 4 | 4.50 | 3.152 | 0.674 | 6.00 | * | 23.00 |
| 5 | 5.56 | 4.060 | 0.750 | 7.50 | * | 38.00 |
| 6 | 6.62 | 4.892 | 0.864 | 9.00 | * | 69.00 |
| 8 | 8.62 | 6.870 | 0.875 | 12.00 | * | 120.00 |
| 10 | 10.75 | 8.750 | 1.000 | 15.00 | 140 | 232.00 |
| 12 | 12.75 | 10.750 | 1.000 | 18.00 | 120 | 315.00 |
Materials We Supply
90° Long Radius Elbow 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's the difference 'tween a long radius and short radius elbow?
Centerline radius. A long radius elbow turns on a radius of 1.5 times the nominal pipe size; a short radius elbow turns on 1.0 times. Long radius is your default 'cause dat gentler sweep means a lower pressure drop and less erosion. Short radius is the fallback when y'all ain't got enough room for the full turn.
What does the C dimension mean on an elbow?
C is dat center-to-end distance: from the theoretical intersection of them two pipe centerlines right to the weldin' end face. On a standard long radius 90° elbow, it equals 1.5 × the nominal pipe size, so a 6" elbow's got a 9" center-to-end.
What standard covers dem butt weld elbows?
ASME B16.9 covers dimensions and tolerances for factory-made wrought butt-weldin' fittin's. Material is specified separately, most commonly ASTM A234 for carbon and alloy steel, or ASTM A403 for stainless, yessir.
