scope:

This NORSOK standard covers additional and optional technical requirements to ASME B31.3 for welding and weld inspection of piping systems in material types carbon steel with SMYS ≤ 360 MPa, SS type 316, type 6Mo, type 565, type 22Cr duplex and type 25Cr duplex, titanium grade 2 and copper-nickel alloys. The materials shall be selected and specified in accordance with piping class sheets included in NORSOK L-001. That means that this standard covers piping systems with nominal outside diameter greater than 20 mm and wall thickness ranging from 2,5 mm and above.

The standard applies to all welding and weld inspection of piping fabrication at all stages from prefabrication, through module or skid mounted unit assembly, site and field installation and modification work during operation.