This NORSOK standard covers additional and optional technical requirements to ASME B31.3 for welding and weld inspection of piping systems, selected and specified in accordance with to NORSOK L-001, and applies to all piping fabrication including prefabrication, module assembly, package or skid mounted units, site and field installation.
The intention of this NORSOK standard is to provide additional requirements regarding welding and inspection of piping systems designed to ASME B31.3 for hydrocarbon production and process systems and supporting utility systems.
In this edition the following main changes are introduced:
- requirements to facilitated compliance with PED (EC Pressure Equipment Directive, 97/23/EC) is deleted;
- references to relevant parts of EN 288 is replaced with relevant parts of ISO 15614;
- references to EN 729-2 are replaced with ISO 3834-2;
- requirements are added with respect to weld coordination and weld inspection;
- impact testing of welds in carbon steel Type 235 is deleted;
- location of impact test specimens are changed to comply with ISO 15614-1;
- maximum hardness requirements for Type 22 and 25Cr duplex is deleted;
- for Type 25Cr a change in UNS No is deleted as an essential change;
- for carbon steels Type 360 and with higher SMYS without PWHT, an increase in CE (IIW) of more than 0,03 is added as an essential change;
- requirements to welding consumables for carbon steel, Type 6Mo and Type 22/25Cr Duplex is modified;
- maximum inter pass temperature requirement is modified;
- requirement for recording weld repair rates is added;
- radiographic sensitivity requirement is modified;
- informative annexes for colour coding and welding inspection activities are added;
- normative annex for acceptable oxidation of welds in stainless steels is added.
In addition minor changes and modifications are also made.
Download standard (M-601e5.pdf, 424 Kb)
The following companies have additional requirements to this standard: