ASTM A234 WPB and A106B are the representative material of carbon steel pipe bend, which is used to change the direction of run pipe fluid. It takes the largest proportion in fittings that are used in piping system, about 80%. It can match long distance transition requirement.
Pipe bend has the same function as pipe elbow. But their bending radius are different. The radius of bend is larger than 1.5D, and could be 2D bends, 2.5D bends, 3D bends, 4D bends, 5D bends, and 10D bends. Pipe elbows have 1D and 1.5D bend radius which mean short radius elbow and long radios elbow.
Carbon steel pipe bend are available in ASTM A234 WPB, WPC, A106B, A860 WPHY 42, WPHY 46, WPHY 52, WPH 60, WPHY 65, WPHY 70. And size is from DN20 to DN1200.
This specification covers wrought carbon steel and alloy steel fittings of seamless and welded construction. These fittings are used in pressure piping and pressure vessel fabrication for service at moderate and elevated temperatures. The standard is ASME B16.9. Butt Weld Fittings shall be subjected to tension test, hardness test, and hydrostatic test. This specification does not cover cast welding fittings or fittings machined from castings.
ASME B16.9 Butt Weld Fittings
Butt weld fittings consist of pipe bend, pipe elbow, concentric reducer and eccentric reducer,pipe cap,equal tee and reducing tee.
ASME/ANSI B16.9 butt weld fittings have large diameter and schedule range, while the diameter of ASME B16.11 socket weld fittings are below 4 inch. And B16.9 fittings can offer a stable connection and add strength to pipe systems.