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NACE MR0103 / ISO 17945-1 : 2016 – New revision to the document for metallic materials resistant to SSC in refining.

REVISION CLARIFICATION: ISO 17945 was published in April 2015. The same document was approved by the American National Standard Institute as ANSI / NACE MR0103 / ISO 17945 on November 23rd, 2015. A typo on the front cover reads “ISO 17495” instead of “ISO 17945”. Furthermore, the same document was approved and the revision year is stated as 2016.


The new revision of NACE MR0103 has been issued as ANSI / NACE MR0103 / ISO 17945-1 2016. This new revision supersedes NACE MR0103 2012.

The new revision NACE MR0103 2016 has adopted the ISO format; this new format makes a revision comparison difficult unlike the changes of NACE MR0175 from revision 2009 to 2015; for NACE MR0175 / ISO 15156 we listed the changes line by line in a separate article.

In addition to changes to format, number and layout, NACE MR0103 2016 also has several new sections added including normative references, terms, definitions, symbols and abbreviated terms. Addition of these new sections resulted in a new numbering system means that clause cross reference between revision 2012 and 2015 is not possible.

In this article, we review some of the major changes, but the reader is warned that this is not an exhaustive list. If you require a detailed analysis of how the new NACE MR0103 / ISO 17945-1 Rev 2016 will affect your activities please contact us.

Some of the changes include a clear reference in clause 7.5 regarding responsibilities for material substitution and equivalence. Another change is the removal of appendix D (nonmandatory) that addressed  duplex stainless steels welding in detail. We recommend clients to develop their own duplex welding specification to minimise the risk of uncontrolled hydrocarbon releases and other failures.

Appendix C

A major change in NACE MR0103 2016 is the introduction of new welding procedure qualification hardness survey layouts in Appendix C. A total of 7 (seven) new figures showing the layouts for hardness surveys of new welding procedure qualifications have been introduced. These new layouts give more emphasis to the heat affected zone (HAZ) and the weld metal adjacent to the fusion line on the toes of the weld for both cap and root. Partial penetration welds are also included as well as repair weld qualifications. The number of indentations for butt, filler and overlay welds have also been updated.

These changes will disrupt the methodology used for several years now, furthermore, hardness surveys in accordance with NACE MR0175 / ISO 15156 will not be acceptable for new qualification procedures.

The new welding procedure qualification hardness survey layouts are required for new qualifications, NACE MR0103 2016 is very clear with regards to previously qualified procedures. NACE MR0103 2016 provides clear instructions in clause C7 and clause C8 regarding the validity of hardness surveys in accordance with NACE MR0175 / ISO 15156, previous revisions of NACE MR0103 and NACE SP0472. For more information contact us.

Other relevant changes in NACE MR0103 2016 include a clause that references ASME IX when temper bead technique is used for weld qualifications.

If you require technical support in NACE MR0103 do not hesitate and contact us we are here to help.

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