180° Return Bend - Butt-Weld Pipe Fitting
Our 180° butt-weld return bend reverses the direction of a pipe run by a full 180 degrees within a single fitting. It provides a compact, low-weld alternative to two separate 90° elbows and is essential for heat exchanger tube bundles, fired heater coils and hairpin circuit layouts where space is at a premium.
Each return bend is supplied with factory-machined weld-end bevels to ASME B16.25 for full-penetration butt welding. Full heat-number traceability and EN 10204 3.1 material test certificates are available to satisfy UK site quality requirements.
Standards & Materials
Manufactured to BS EN 10253-2 and ASME B16.9 in a choice of carbon and stainless steel grades to suit your operating pressure and temperature.
| Attribute | Specification |
|---|---|
| Manufacturing Standard | BS EN 10253-2 / ASME B16.9 |
| Carbon Steel | ASTM A234 WPB |
| Stainless Steel | ASTM A403 WP304 / WP304L / WP316 / WP316L |
| Special Grades | Duplex & Super Duplex (UNS S31803 / S32205 / S32750), Alloy 20, Inconel 625 / 825, Monel 400, Hastelloy C-276 - available on request |
| Fabrication | Seamless or welded |
| Weld-End Bevel | ASME B16.25, 37.5° half-angle |
| Test Pressure | Up to 1 500 psi (103 bar) |
| Return Configuration | 180° U-bend with centre-to-centre dimension K per ASME B16.9 |
Dimensions & Sizes
Offered from 1/2" (DN15) to 24" (DN600) in schedules 10, 40 and 80. The table below shows representative ASME B16.9 overall U-bend dimension K and SCH 40 wall thickness for common sizes.
| NPS | DN | Overall U-Dim K (mm) | SCH 40 Wall (mm) |
|---|---|---|---|
| 1/2" | 15 | 76 | 3.73 |
| 3/4" | 20 | 76 | 3.91 |
| 1" | 25 | 76 | 4.55 |
| 1-1/2" | 40 | 95 | 5.08 |
| 2" | 50 | 121 | 5.54 |
| 3" | 80 | 159 | 7.11 |
| 4" | 100 | 206 | 8.56 |
| 6" | 150 | 305 | 10.97 |
| 8" | 200 | 406 | 12.70 |
| 12" | 300 | 610 | 17.48 |
Performance & Benefits
A single 180° return bend replaces two 90° elbows and a connecting pipe spool, eliminating at least two butt welds. This reduces on-site welding time, lowers NDT inspection costs and shrinks the overall envelope of coil circuits. The smooth, continuous radius also maintains uniform flow velocity through the bend, minimising turbulence-induced vibration and erosion.
Typical Applications
Commonly specified for petrochemical furnaces, boiler economisers, shell-and-tube heat exchangers, coil circuits and HVAC chiller assemblies across the UK where flow must be reversed efficiently within a compact footprint.
Quality Assurance & Traceability
Every fitting is manufactured to BS EN 10253-2 and ASME B16.9 and supplied with full material traceability and EN 10204 Type 3.1 test certificates. Heat numbers are recorded throughout production to support inspection, QA and UK project-compliance requirements.
Supply & Delivery
Stocked at our Sheffield, UK facility and delivered nationwide across England, Scotland and Wales. We offer fast dispatch from stock with tracked UK delivery to site, and next-day options for common sizes.
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Which sizes and schedules are available?
Available from 1/2" (DN15) to 24" (DN600) in schedule 10, 40 and 80, in both metric and imperial sizes to suit UK installations.
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Does a return bend save space compared to two 90° elbows?
Yes. A single 180° return bend occupies roughly half the linear footprint of two 90° elbows with an intermediate pipe spool. It also removes two butt welds, reducing fabrication time, NDT costs and potential leak paths in the assembly.
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Can you provide material certificates?
Yes. Material test certificates and full traceability documentation are available with every order, to project and quality-management requirements.
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Do you deliver across the UK?
We deliver nationwide throughout England, Scotland and Wales, with fast dispatch from stock and tracked deliveries to site.