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Rees NDT Inspection Services Ltd.
Your Premier Engineering Certification and Inspection Service Partner



If your equipment sees sour service, both you and your clients want to see proof that it is NACE MR0175 compliant.  If it isn't compliant, it may not be long before H2S has destroyed it!

Wet H2S environments at ambient temperatures can do nasty, nasty things to the wrong kinds of steels and alloys.  Microfracturing and intense corrosion of certain alloys was noted early in the history of the oilpatch.  Rules-of-thumb about what NOT to use quickly evolved, but those did not address causes or systematic preventative measures. A history of NACE MR0175 can be found here. The Standard has its origins in the group efforts of Western Canadian Sedimentary Basin oilfield engineers who pooled their knowledge about successful sour gas handling, organized themselves as a NACE commitee and began issuing recommendations and documents as early as 1963.

Today, NACE MR0175/ISO 15156 is a standard evolved and maintained by the National Association of Corrosion Engineers (NACE) International.  It deals with how to manufacture and maintain equipment in such a way that it has good resistance to sulfide stress cracking (SSC).  API 6A deals with specifications for wellhead and Christmas tree equipment.  Together, both specs lay out how to inspect maintain and certify equipment like flanges and drilling spools for use in wet sour service environments.  We can test items for unacceptable materials, test for unacceptable hardness, and test for the presence of SSC and certify compliance.  We can be part of a team that does everything already mentioned, and have the dimensional verification and pressure test for API 6A completed as part the whole certification operation.

When it comes to NACE MR0175/ API 6A certification, we can get it done!

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