Pipe fittings
Butt weld elbows in nickel alloys, titanium and special stainless steel
Hangbo manufactures butt weld elbows to ASME B16.9 dimensions (and MSS SP-43 for light wall) in Inconel, Hastelloy, Monel, Incoloy, titanium and duplex stainless steel, from NPS ½ to NPS 48.
Dimensions and reference data
| NPS | DN | Outside diameter (mm) | 90° LR centre-to-end A (mm) | 90° SR centre-to-end A (mm) |
|---|---|---|---|---|
| ½ | 15 | 21.3 | 38 | – |
| ¾ | 20 | 26.7 | 38 | – |
| 1 | 25 | 33.4 | 38 | 25 |
| 1½ | 40 | 48.3 | 57 | 38 |
View all 14 rows
| NPS | DN | Outside diameter (mm) | 90° LR centre-to-end A (mm) | 90° SR centre-to-end A (mm) |
|---|---|---|---|---|
| 2 | 50 | 60.3 | 76 | 51 |
| 3 | 80 | 88.9 | 114 | 76 |
| 4 | 100 | 114.3 | 152 | 102 |
| 6 | 150 | 168.3 | 229 | 152 |
| 8 | 200 | 219.1 | 305 | 203 |
| 10 | 250 | 273.0 | 381 | 254 |
| 12 | 300 | 323.9 | 457 | 305 |
| 16 | 400 | 406.4 | 610 | 406 |
| 20 | 500 | 508.0 | 762 | 508 |
| 24 | 600 | 609.6 | 914 | 610 |
Long radius centre-to-end A equals 1.5 x NPS in inches converted to millimetres; short radius equals 1.0 x NPS. The 45° long radius centre-to-end dimension B is approximately 0.414 x A, for example 64 mm for NPS 4 and 189 mm for NPS 12. Full tables covering every NPS size are issued with each quotation or on request.
| NPS range | DN range | O.D. at bevel (mm) | I.D. at end (mm) | Off angle Q (mm) | Off plane P (mm) |
|---|---|---|---|---|---|
| ½ – 2½ | 15 – 65 | +1.6 / -0.8 | ±0.8 | ±1 | ±2 |
| 3 – 3½ | 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 |
Specifications and options
| Dimensional standard | ASME B16.9 (factory-made wrought butt welding fittings); MSS SP-43 for light wall |
|---|---|
| Nickel alloy material | ASTM B366 / ASME SB-366 - WP625, WP718, WPHC276, WPHC22, WP400, WP500, WP825, WP800H / WP800HT, WP600, WP601, WPX |
| Titanium material | ASTM B363 / ASME SB-363 - WPT2, WPT5, WPT7, WPT12 |
| Duplex / stainless material | ASTM A815 (WP-S32205, WP-S32750), ASTM A403 (WP316L, WP321, WP347, WP904L, WPS31254) |
| Seamless pipe feedstock | ASTM B444, B423, B622, B167, B861, A312, A790 depending on grade |
| End preparation | ASME B16.25 butt welding ends, 37.5° ± 2.5° bevel unless specified otherwise |
| Heat treatment | Solution anneal and quench per the applicable material specification, recorded per heat lot |
| NDT | Dye penetrant on all formed areas; radiographic or ultrasonic testing to order |
| Marking | Manufacturer symbol, material grade, wall thickness designation, size and heat number |
| Certification | EN 10204 3.1 with chemical analysis, mechanical properties, heat treatment record and dimensions |
Typical applications
- Chemical process pipework carrying mixed acids, solvents and chlorinated streams
- Offshore seawater lift, firewater, cooling water and produced water lines
- Refinery heater outlet pigtails, transfer lines and hydrocracker circuits
- Flue gas desulphurisation absorber recirculation and slurry lines
- Power station feedwater, condensate and flue gas duct transitions
- LNG and cryogenic transfer lines where low temperature toughness is required
- Piggable long radius bend systems for subsea and cross-country pipelines
How to order butt weld elbows
Send us the following and we will return a quotation within 24 hours: alloy grade or UNS number, dimensions including schedule or wall thickness, governing material and dimensional standards, quantity, required heat treatment, non-destructive testing scope, certificate type and any third party inspection requirement.
Butt Weld Elbows frequently asked questions
What is the difference between a long radius and a short radius elbow?
A long radius elbow has a centreline radius of 1.5 times the nominal pipe size, giving smoother flow, lower pressure drop and less erosion. A short radius elbow has a radius equal to the nominal pipe size and is used where space is limited or where the line has low velocity and non-abrasive contents.
Do you supply seamless elbows in all sizes?
Nickel alloy elbows up to about NPS 16 are normally produced seamless from pipe. Larger sizes, and sizes with heavy walls, are frequently manufactured by hot forming from plate with a longitudinal weld that is 100 % radiographed before forming.
Which wall thicknesses can you offer?
Schedule 5S, 10S, 40S, 80S and 160 plus XS and XXS, subject to size and grade availability. Light wall fittings are usually quoted to MSS SP-43.
Can you supply 3D or 5D bends for piggable pipelines?
Yes. We produce long radius bends to 3D, 5D and larger with induction bending where required, with ovality and wall thinning controlled to project specification.
How do I check that the elbow material is genuine?
Every fitting carries the heat number stamped or etched on the body, which ties directly to the EN 10204 3.1 certificate showing the ladle analysis and mechanical test results. Positive material identification can be performed on request.
What information do you need for a quotation?
Alloy grade or UNS number, nominal pipe size and schedule or wall thickness, elbow angle and radius, dimensional and material standard, quantity, heat treatment requirement, NDT scope, the EN 10204 3.1 certificate and any third party inspection requirement.