M-601 Welding and Inspection of piping (Edition 6, April 2016)

This 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.

In the 2016 edition the following main changes are introduced:

  • the scope of the standard has been amended;
  • definition of carbon steel is added;
  • references to EN 473 is replaced with ISO 9712;
  • references to EN 287 is replaced with ISO 9606-1;
  • a new informative Clause for use of this standard is added;
  • new sections for weld qualification with respect to welding position and range of heat input/arc energy are added;
  • requirements related to low alloy steel and nickel base alloys are deleted;
  • weld qualification requirements for austenitic stainless steel type 565 is added;
  • recommendation for minimum distance between girth welds is added;
  • requirement for documentation of compliance with ISO 3834-2 is added;
  • requirement for organization chart and responsibility for responsible weld co-ordinator are added;
  • requirements for measurement and recording of weld parameters during qualification test weld are added;
  • requirements to the documentation dossier of WPQR/PQR is added;
  • references to EN 1418 are replaced with ISO 14732;
  • the corrosion test temperature of type 25Cr duplex is reduced to 35 °C;
  • essential variable for change in groove angle is modified;
  • the maximum interpass temperature of type 25Cr duplex is reduced to 100 °C for manual welding;
  • requirements for measurement and maximum content of oxygen content in backing gas for welding of SS and titanium alloy is added;
  • requirement for purging of gas when welding attachments to pipes is added;
  • requirements to welds with buttering is added;
  • requirement for PWHT procedure is added;
  • requirements to removal of temporary attachments are added;
  • visual testing of internal root run during welding o-lets to header is added;
  • new section for visual testing is added;
  • option to replace radiographic testing with ultrasonic testing is added for all materials;
  • requirements for reporting level of UT is added;
  • requirements for alternative NDT methods are added;
  • acceptance criteria for oxidation of welds in titanium is modified;
  • requirements to weld repair is modified;
  • extent of PMI is modified.

In addition minor changes and modifications in wording are made.

Additional requirements: ConocoPhillips

NOK 906,00 (eks. mva)

Welding and inspection of piping

SpråkEngelskUtgave: 6 (2016-04-29)

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