M-001 Materials selection (Rev. 4, August 2004)

Note:
A misprint in table 7 is corrected 2004-10-18. The partial pressure H2S is given in bar a.

A misprint in table 6 is corrected 2006-09-28. Max free chlorine for 6Mo is given in ppm.

This NORSOK standard provides general principles, engineering guidance and requirements for materials selection and corrosion protection for hydrocarbon production and processing facilities and supporting systems for fixed offshore installations. This NORSOK standard also applies for onshore terminals, except for structural and civil works.

This NORSOK standard gives guidance and requirements for: corrosion and materials selection evaluations, specific materials selection where appropriate, corrosion protection, design limitations for specific materials, qualification requirements for new materials or new applications.

This NORSOK standard gives recommendations, requirements and guidelines for materials use in oil and gas production. This revision 4 includes requirements from NORSOK M-CR-505 "Corrosion monitoring design", which is withdrawn. The evaluation of internal corrosivity in hydrocarbon systems is rewritten and considers corrosion inhibitor availability instead of efficiency, and the maximum hardness and yield strength requirements of materials to be cathodically protected have been lowered.

This NORSOK standard is intended to comply with the requirements of the "Pressure Equipment Directive" (PED) and the Norwegian implementation regulation "Forskrift for trykkpåkjent utstyr" issued 9 June 1999. The requirements given for materials by PED, Annex I "Essential Safety Requirements", section 4.1, are fulfilled provided the principles of materials selection of this NORSOK standard are followed and documented.