ASME B16.9 Long Radius Returns (180° LR Returns) are precision-engineered pipe fittings designed for 180° directional changes in piping systems. With a bending radius of 1.5 times the nominal pipe size (R=1.5D), they deliver superior flow efficiency, structural strength, and compatibility with global standards.
Production Workflow
Material Preparation: High-quality steel ingots or plates are selected, with full traceability via raw material certificates (MTC).
Forming: Hot push forming for sizes up to NPS 24", large-diameter fittings (NPS 24"+) are fabricated via welding steel plates, followed by precision machining.
Heat Treatment: Controlled heating and cooling to optimize material strength and structural integrity.
Surface Finishing: Options include anti-rust oil, black paint, hot-dip galvanizing, or bare metal for specific project needs.
Inspection & Testing: 100% dimensional checks, pressure testing, and non-destructive examinations (NDE) such as ultrasonic or radiographic testing to detect defects.
Key Advantages Over Standard Fittings
Superior Flow Efficiency: Larger bending radius minimizes flow resistance and pressure drop, reducing energy consumption and system wear.
Enhanced Structural Strength: Uniform wall thickness and precise forming prevent stress concentrations, extending service life in high-pressure applications.
Space-Saving Design: Compact 180° turn fits in tight layouts, ideal for projects with spatial constraints.
Cost-Effective: Reduced maintenance needs and long-term durability lower total cost of ownership compared to inferior alternatives.
Global Compatibility: Aligns with ASME B16.9 and international standards, simplifying project specifications and procurement for global clients.
Core Industry Applications
Oil & Gas: Onshore and offshore pipelines, refineries, and gas processing plants for crude oil, natural gas, and refined product transport.
Petrochemicals: Chemical processing units, acid and alkali fluid transport, and high-temperature reaction systems.
Power Generation: Thermal power, nuclear power, and renewable energy projects for steam, cooling water, and fuel lines.
Construction & Infrastructure: High-rise buildings, industrial plants, and municipal water supply/ drainage systems.
Marine & Shipbuilding: Shipboard piping systems, offshore platforms, and seawater desalination plants.
ASME B16.9 Long Radius Returns dimensions
|
Nominal Pipe Size (NPS) |
DN |
Outside Diameter at Bevel |
Center- to- Center, D |
Back- to- Face, K |
|
1/2 |
15 |
21.3 |
76 |
48 |
|
3/4 |
20 |
26.7 |
76 |
51 |
|
1 |
25 |
33.4 |
76 |
56 |
|
1 1/4 |
32 |
42.2 |
95 |
70 |
|
1 1/2 |
40 |
48.3 |
114 |
83 |
|
2 |
50 |
60.3 |
152 |
106 |
|
2 1/2 |
65 |
73.0 |
190 |
132 |
|
3 |
80 |
88.9 |
229 |
159 |
|
3 1/2 |
90 |
101.6 |
267 |
184 |
|
4 |
100 |
114.3 |
305 |
210 |
|
5 |
125 |
141.3 |
381 |
262 |
|
6 |
150 |
168.3 |
457 |
313 |
|
8 |
200 |
219.1 |
610 |
414 |
|
10 |
250 |
273.0 |
762 |
518 |
|
12 |
300 |
323.8 |
914 |
619 |
|
14 |
350 |
355.6 |
1067 |
711 |
|
16 |
400 |
406.4 |
1219 |
813 |
|
18 |
450 |
457 |
1372 |
914 |
|
20 |
500 |
508 |
1524 |
1016 |
|
22 |
550 |
559 |
1676 |
1118 |
|
24 |
600 |
610 |
1829 |
1219 |
GENERAL NOTE: All dimensions are in millimeters.
NOTES:
(1) Dimension A is equal to one-half of dimension O.
(2) O and K dimentions of 57 mm and 43 mm, respectively, may be furnished for NPS 3/4 (DN 20) at the manufacturer's option.
