Question:

How should existing equipment affected by changing materials requirements in later editions of the standard be handled?

Answer:

By convention, a new version of the standard is not applied retrospectively to equipment built to the previous version of the standard valid at the time of equipment construction.

New requirements in the latest version may be applied retrospectively by an equipment user or mandated for retrospective application by a regulatory authority.

This question is in relation to NACE MR0175/ISO 15156-1 Clause 8.2

Reference: ISO 15156 Maintenance Panel Inquiry #2005-10

At Oil & Gas Corrosion we help the industry with understanding the changes in NACE MR0175 revisions and also to verify raw material and equipment is fit for purpose regardless of the NACE MR0175 certification year.