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In the NACE MR0175 butt weld survey criteria, what is the acceptance criteria of middle points?

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Question:

Ref Part 2 Figure 2 Butt Weld Survey method for Vickers Hardness Measurement. Location points 17, 18 & 19. What are the acceptance criteria? Table A.1 only provides acceptance for the Weld Cap and Root. As the area is not exposed should the acceptance level be 275 HV 10?

Answer:

Since it is not at the cap the acceptance level should be 250 HV 10 unless it is proven that it can be relaxed. For now there is no demonstrated evidence to show that 250 Hv can be relaxed at location points 17, 18, and 19 of Part 2 Figure 2.

This question is in relation to NACE MR0175/ISO 15156-2 Clause 7.3.3 Figure 2 Table A.1

Reference: ISO 15156 Maintenance Panel Inquiry #2009-04

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