Hello Pipe Enthusiasts!
This brief article explains what API 2B is, its scope, the main differences with line pipe.
What is API 2B
API 2B is a specification for fabricated structural steel pipe made from plate and welded with longitudinal and circumferential butt joints; the standard generally applies to large‑diameter pipe (typically 14 in. OD and above, and 40 in. and above for the LWDS category) with wall thicknesses of approximately 3/8 in. minimum and nominal lengths up to certain ranges, intended for applications such as piling, main structural members, and tubular truss connections in offshore construction.
Scope and Main Applications
API 2B focuses on pipe produced specifically for structural purposes, not for fluid transmission; the specification does not cover ERW or spiral welded pipe products, but rather butt‑welded fabricated pipe used as piling, main structural members, and tubular connections on offshore platforms and structures.
Technical Specification Summary
- Material: pipes are formed from plate steel that meets structural material requirements.
- Manufacturing process: forming and welding of longitudinal and circumferential butt joints; HFW/ERW and HSAW spiral welded pipes are typically not within the scope of API 2B.
- Typical dimensions: generally OD ≥ 14 inch, wall thickness ≥ 3/8 inch; there is a special categorization for LWDS (large‑welded‑diameter structures) above 40 inch OD.
- Testing & inspection: includes dimensional checks, weld inspections, and non‑destructive testing as specified to ensure structural integrity prior to dispatch.
Closing
API 2B is the primary reference when a project requires fabricated structural pipe for offshore applications and heavy construction.
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