ASME B16.9 Butt Weld Elbows Manufacturer
We are a trusted manufacturer and exporter of ASME B16.9 Butt Weld Elbows, supplying carbon steel, alloy steel, and stainless steel elbows , Our elbows are designed and produced in compliance with ASME B16.9 and international standards, ensuring reliable flow direction changes in pipelines for oil & gas, power generation, petrochemical, shipbuilding, and water treatment industries.
What is a Butt Weld Elbow?
A Butt Weld Elbow is a type of pipe fitting used to change the direction of flow in a piping system. It connects to pipes by butt welding, meaning the ends of the elbow and the pipe are beveled and welded together, creating a strong, leak-proof, and permanent joint.
Product type of Butt weld elbow
- 45° elbow, 90°elbow, or 180°elbow (return bend)
- Types: Short Radius (SR) and Long Radius (LR) or 3D Elbow
Standard Overview
- Standard: ASME B16.9 – Factory-Made Wrought Buttwelding Fittings
- Type: Butt Weld Elbows (Seamless & Welded)
- Sizes: ½” NB to 48” NB (DN15 – DN1200)
- Schedule/Thickness: SCH 10S, 20, 40, 80, 160, XXS
Butt Weld elbow Material for ASME B16.9
Wrought fittings covered by this Standard shall be in accordance with ASTM A234, ASTM A403, ASTM A420, ASTM A815, ASTM B361, ASTM B363, ASTM B366, or the corresponding specification listed in ASME BPVC, Section II. The term “wrought” denotes fittings made of pipe, tubing, plate, or forgings. For purposes of determining proof testing requirements of section 9, the materials are grouped by similar properties as shown in below table
| Group No. | Material | Standards |
|---|---|---|
| 1 | Carbon and low – alloy steels | ASTM A234/A234M and ASTM A420/A420M |
| 2 | Austenitic and duplex stainless steels | ASTM A403/A403M and ASTM A815/A815M |
| 3 | Nickel alloys | ASTM B366/B366M |
| 4 | Aluminum alloys | ASTM B361 |
| 5 | Titanium alloys | ASTM B363 |
Butt weld elbow Materials Gade
- Carbon Steel: ASTM A234 WPB Elbow, WPC elbow
- Alloy Steel: ASTM A234 WP5 elbow,A234 WP9, A234 WP11,WP12,WP22,WP91,WP92
- Stainless Steel: ASTM A403 WP304, WP304L, WP316, WP316L, WP321, WP347
- Nickel Alloys: Inconel, Monel, Hastelloy
- Duplex & Super Duplex Stainless Steel:ASTM A815 WPS31803 ELBOW,ASTM A815 WPS32750 ELBOW
Standard Marking Requirement for ASME B16.9 Butt Weld Elbows
Each elbow marks permanently , indicating the following content:
The name or trademark of the manufacturer
Material identification mark (ASTM or ASME level symbol)
Wall thickness serial number or nominal wall thickness
Specifications – Engineering pipe diameter (NPS) related to end connection should be used
Compliance – standard and special pipe fittings
ASME B16.9 Butt Weld Elbow DIMENSIONS tables
Dimensions Butt Weld Elbows ASME B16.9 – 45°-90° LR and 3D
| NPS | O.D. D | 90° LR A | 45° LR B | 90° 3D A | 45° 3D B |
| 1/2 | 21.3 | 38 | 16 | ||
| 3/4 | 26.7 | 38 | 19 | 57 | 24 |
| 1 | 33.4 | 38 | 22 | 76 | 31 |
| 1.1/4 | 42.2 | 48 | 25 | 95 | 39 |
| 1.1/2 | 48.3 | 57 | 29 | 114 | 47 |
| 2 | 60.3 | 76 | 35 | 152 | 63 |
| 2.1/2 | 73 | 95 | 44 | 190 | 79 |
| 3 | 88.9 | 114 | 51 | 229 | 95 |
| 3.1/2 | 101.6 | 133 | 57 | 267 | 111 |
| 4 | 114.3 | 152 | 64 | 305 | 127 |
| 5 | 141.3 | 190 | 79 | 381 | 157 |
| 6 | 168.3 | 229 | 95 | 457 | 189 |
| 8 | 219.1 | 305 | 127 | 610 | 252 |
| 10 | 273 | 381 | 159 | 762 | 316 |
| 12 | 323.8 | 457 | 190 | 914 | 378 |
| 14 | 355.6 | 533 | 222 | 1067 | 441 |
| 16 | 406.4 | 610 | 254 | 1219 | 505 |
| 18 | 457 | 686 | 286 | 1372 | 568 |
| 20 | 508 | 762 | 318 | 1524 | 632 |
| 22 | 559 | 838 | 343 | 1676 | 694 |
| 24 | 610 | 914 | 381 | 1829 | 757 |
| 26 | 660 | 991 | 406 | 1981 | 821 |
| 28 | 711 | 1067 | 438 | 2134 | 883 |
| 30 | 762 | 1143 | 470 | 2286 | 946 |
| 32 | 813 | 1219 | 502 | 2438 | 1010 |
| 34 | 864 | 1295 | 533 | 2591 | 1073 |
| 36 | 914 | 1372 | 565 | 2743 | 1135 |
| 38 | 965 | 1448 | 600 | 2896 | 1200 |
| 40 | 1016 | 1524 | 632 | 3048 | 1264 |
| 42 | 1067 | 1600 | 660 | 3200 | 1326 |
| 44 | 1118 | 1676 | 695 | 3353 | 1389 |
| 46 | 1168 | 1753 | 727 | 3505 | 1453 |
| 48 | 1219 | 1829 | 759 | 3658 | 1516 |
Dimensions are in millimeters unless otherwise indicated. Wall thickness (t) must be specified by customer. A & B are Center to End dimensions
Dimensions Butt Weld Elbows ASME B16.9 – 90° SR
BW elbows 90° SR
The center to face distance for a long radius elbow, abbreviated LR always is 1.1/2 x Nominal Pipe Size (NPS) (1.1/2D), while the center to face distance for a short radius elbow, abbreviated SR even is to nominal pipe size
| NPS | O.D. D | CTE A | NPS | O.D. D | CTE A |
| 1 | 33.4 | 25 | 8 | 219.1 | 203 |
| 1.1/4 | 42.2 | 32 | 10 | 273 | 254 |
| 1.1/2 | 48.3 | 38 | 12 | 323.8 | 305 |
| 2 | 60.3 | 51 | 14 | 355.6 | 356 |
| 2.1/2 | 73 | 64 | 16 | 406.4 | 406 |
| 3 | 88.9 | 76 | 18 | 457 | 457 |
| 3.1/2 | 101.6 | 89 | 20 | 508 | 508 |
| 4 | 114.3 | 102 | 22 | 559 | 559 |
| 5 | 141.3 | 127 | 24 | 610 | 610 |
| 6 | 168.3 | 152 | – | – | – |
Dimensions are in millimeters unless otherwise indicated. Wall thickness (t) must be specified by customer.
Dimensions Butt Weld Elbows ASME B16.9 – 180° LR & SR
The function of a 180° elbow is to change direction of flow through 180°. Both, the LR and the SR types have a center to center dimension double the matching 90° elbows
| NPS | O.D. D | 180° LR | 180° SR | ||
| Center to Center O | Back to Face K | Center to Center O | Back to Face K | ||
| 1/2 | 21.3 | 76 | 48 | ||
| 3/4 | 26.7 | 76 | 51 | ||
| 1 | 33.4 | 76 | 56 | 51 | 41 |
| 1.1/4 | 42.2 | 95 | 70 | 64 | 52 |
| 1.1/2 | 48.3 | 114 | 83 | 76 | 62 |
| 2 | 60.3 | 152 | 106 | 102 | 81 |
| 2.1/2 | 73 | 190 | 132 | 127 | 100 |
| 3 | 88.9 | 229 | 159 | 152 | 121 |
| 3.1/2 | 101.6 | 267 | 184 | 178 | 140 |
| 4 | 114.3 | 305 | 210 | 203 | 159 |
| 5 | 141.3 | 381 | 262 | 254 | 197 |
| 6 | 168.3 | 457 | 313 | 305 | 237 |
| 8 | 219.1 | 610 | 414 | 406 | 313 |
| 10 | 273 | 762 | 518 | 508 | 391 |
| 12 | 323.8 | 914 | 619 | 610 | 467 |
| 14 | 355.6 | 1067 | 711 | 711 | 533 |
| 16 | 406.4 | 1219 | 813 | 813 | 610 |
| 18 | 457 | 1372 | 914 | 914 | 686 |
| 20 | 508 | 1524 | 1016 | 1016 | 762 |
| 22 | 559 | 1676 | 1118 | 1118 | 838 |
| 24 | 610 | 1829 | 1219 | 1219 | 914 |
Dimensions are in millimeters unless otherwise indicated.
Wall thickness (t) must be specified by customer.
Dimensions Butt Weld Elbows ASME B16.9 Tolerance
| NPS | DN | O.D | I.D | Off Angle, Q | Off Plane, P |
|---|---|---|---|---|---|
| 1/2~2-1/2 | 15~65 | +1.6, -0.8 | ±0.8 | ±1 | ±2 |
| 3~3-1/2 | 80~90 | ±1.6 | ±1.6 | ±2 | ±4 |
| 4 | 100 | ±1.6 | ±1.6 | ±3 | ±5 |
| 5~8 | 125~200 | +2.4, -1.6 | ±1.6 | ±3 | ±6 |
| 10~18 | 250~450 | +4.0, -3.2 | ±3.2 | ±4 | ±10 |
| 20~24 | 500~600 | +6.4, -4.8 | ±4.8 | ±5 | ±10 |
| 26~30 | 650~750 | +6.4, -4.8 | ±4.8 | ±5 | ±13 |
| 32~48 | 800~1200 | +6.4, -4.8 | ±4.8 | ±5 | ±19 |
Marking of ASME B16.9
Standard Marking Each fitting shall be permanently marked to show the following:
(a) manufacturer’s name or trademark
(b) material identification, either the ASTM or ASME grade designation
(c) schedule number1 or nominal wall thickness in mm
(d) size — the nominal pipe size (NPS) identification number related to the end connections shall be used
(e) compliance—see para. 4.4 for standard and special fitting marking
A manufacturer may supplement these mandatory markings with others, including a DN size designation, but confusion with the required marking shall be avoided.
Technical Specifications
- Dimensions: As per ASME B16.9 & ANSI standards
- End Connections: Butt Weld Ends (beveled as per ASME B16.25)
- Manufacturing Process: Seamless, Welded, or Fabricated
- Testing & Certification:
- Non-destructive testing (NDE)
- PMI (Positive Material Identification)
- EN 10204 3.1 / 3.2 certification
- Third-party inspection (TÜV, SGS, BV, LR, DNV)
Download ASME B16.9-2024 Elbow Dimension
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