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Is it acceptable to use HV 500g (microhardness) testing for NACE applications for WPS qualification?

Question: Is it acceptable to use HV 500g (microhardness) testing for NACE applications for WPS qualification? I understand that Paragraph 7.3.3.2 of NACE MR0175/ISO 15156 Part 2 says that hardness testing shall normally be carried out using HV 10kg or HV 5kg, which is our usual practice. FYI, the hardness testing was done with HV 500g on CSA Z245.1 Grade 359 pipe material.

Answer:

Yes, subject to the agreement of the equipment user. Please see NACE MR0175/ISO 15156-2, Para. 7.3.3.2.

This question is in relation to NACE MR0175/ISO 15156-2 Clause 7.3.3.2

Reference: ISO 15156 Maintenance Panel Inquiry #2006-08

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