API 5L Grade B Line Pipe Physical Properties Line pipe grade designations come from API Spec 5L Specification for Line Pipe. Standard Line Pipe has grade designation A and B. Stronger grades have the designation X followed by the specified minimum yield strength of the pipe steel, measured in kilopounds per square inch (abbreviated ksi), e.g. X60 for pipe having a minimum yield strength of 60 3LPP Pipe Coating Suppliers - API 5L Line Pipe API 5L 3LPP Pipe Coating, API 5L Grade B X42, API 5L Line Pipes suppliers 3LPP Coated Pipes consists of multilayer anti-corrosion coatings consisting of an inner layer of fusion bonded epoxy layer, the middle layer is an adhesive layer and an outer layer of polypropylene.
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