Seamless Butt Welding Pipe Fittings

Seamless butt-welding fittings overview: elbows, tees, reducers and caps to ASME B16.9 / B16.28 / MSS SP-75 / GB/T 12459, for low- to high-pressure piping (including ASME B31.3 Chapter IX).

Description

Seamless butt-welding pipe fittings cover four product families — elbows, tees, reducers and end caps — all manufactured to ASME B16.9 (NPS 1/2–48 long-radius), ASME B16.28 (short-radius NPS 1/2–24), MSS SP-75 / ASTM A860 (WPHY high-strength low-alloy) and GB/T 12459. Elbows change pipe direction (45°/90°/180°) at 1.5D long-radius or 1.0D short-radius per B16.9. Tees branch the main line (equal or reducing). Reducers transition between bore sizes (concentric or eccentric). Caps close pipe ends (typically ellipsoidal heads). All fittings are bevelled for butt-welding to seamless pipe of the matching material; final grade, schedule and heat-treatment state per drawing / RFQ.

Referenced standards

• ASTM A234
  Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service
  ASTM International
• ASTM A403
  Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings
  ASTM International
• ASTM A420
  Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low-Temperature Service
  ASTM International
• MSS SP-75
  Specification for High-Test, Wrought, Butt-Welding Fittings
  Manufacturers Standardization Society (MSS)