API SPEC 2B pdf download.Specification for the Fabrication of Structural Steel Pipe 1 Scope 1.1 This specification covers the fabrication of structural steel pipe formed from plate steel with longitudinal and cir- cumferential butt-welded seams, typically in sizes 14 in. out- side diameter (OD) and larger (40 in. and larger for LWDS) with wall thickness 3 / 8 in. and...