Does NACE MR0175/ISO 15156 Apply to Springs with Plastic Deformation Criteria?

Introduction

This page provides an answer to a question regarding the applicability of NACE MR0175/ISO 15156 when designing springs with plastic deformation criteria. Specifically, the question is whether the standard applies when areas of a spring are plastically deformed (not more than 1 or 2% strain).

The Answer

NACE MR0175/ISO 15156 does not apply to designs made with plastic deformation criteria, as specified in Paragraph 5 of Part 1. Qualification through testing or field experience may be used to qualify this type of design, but it will fall outside the limits of the standard.

The Reference

This question pertains to NACE MR0175/ISO 15156-3 Table A.39, and the reference cited is ISO 15156 Maintenance Panel Inquiry #2009-05.