American Butt Weld 180° Return
- Material: carbon steel, duplex steel, Hastelloy.
- Standard: ASME B16.9, DIN 2605.
- Size range: 1/2″ to 48″（DN15-DN1200）
- Temperature Range: -29°C ~ 425°C (Carbon Steel).
- Connection: Butt-welding at both ends.
- Turning angle: 180° bend radius, SR and LR.
- Coefficient of friction f: 0.015-0.035.
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American Butt Weld 180° Return is a U-shaped butt-welding elbow for pipework systems, which enables the transport of fluids in the opposite direction by means of a 180° design and is suitable for compact space layouts.
American Butt Weld 180° Return
- Withstands ≥1000 PSI and ≤800°F (depending on material) for extreme service conditions.
- Manufacturing standards: in accordance with ASME B16.9, MSS-SP-43 and other international norms.
- Typical conditions: high-temperature steam piping, high-pressure fluid transport, corrosive media (such as acid and alkali solutions).
- Support non-standard sizes, special materials (such as duplex stainless steel) and surface treatment (polishing, sandblasting, etc.).
Long radius vs. short radius
American Butt Weld 180° Return divided into two categories by bending radius (R):
- Long Radius (LR): Bending Radius R = 1.5 × D (D is the nominal diameter)
- Short Radius (SR): Bending radius R = 1.0 × D
| Parameter | Long radius (LR) | Short radius (SR) | Standard basis |
| Bending radius (R) | 1.5D | 1.0D | ASME B16.9 |
| Centre distance (CLR) | 3D | 2D | MSS SP-43 |
| Flow resistance factor (K value) | 0.3-0.5 | 0.5-0.8 | Crane TP-410 |
| Minimum Wall Thickness Compensation | 12% | 22% | ASME B16.9-2024 |
Long radius vs. short radius Advantage
Long Radius (LR):
Advantage: low turbulence, low pressure loss, suitable for high flow rate/high viscosity media (e.g. crude oil, slurry).
Typical applications: refinery main process pipelines, LNG long-distance pipelines.
Short Radius (SR):
Advantage: space saving (33% less installation length than LR), suitable for compact layouts (e.g. offshore platforms, modular plants).
Limitations: Not suitable for media containing solid particles, additional wall thickness compensation is required to prevent the occurrence of localized erosion.
Dimensional Tolerances and Welding Ends
| Nominal Pipe Size | 180°Retur | ||
| Center-to Centre Dimension P | Back-to- Face Dimension K | Alignment of End U | |
| 1/2 to 11/2 | ±6.35 | ±6.35 | ±0.76 |
| 2 to 3 1/2 | ±6.35 | ±6.35 | ±0.76 |
| 4 | ±6.35 | ±6.35 | ±0.76 |
| 5 to8 | ±6.35 | ±6.35 | ±0.76 |
| 10 to 18 | ±9.65 | ±6.35 | ±1.52 |
| 20 to 24 | ±9.65 | ±6.35 | ±1.52 |