What are the NACE MR0175 requirements for ASME IX P1 group 1 and 2 Material?
Ivan Gutierrez discusses the NACE MR0175 requirements for ASME IX P1 Group 1 and 2 materials.
ASME IX P1 material is listed as acceptable in NACE MR0175, but this does not mean that the general requirements do not apply, i.e. hardness heat treatment, HIC resistance etc. At Oil & Gas Corrosion we can help you confirm material compliance to ANSI/NACE MR0175/ISO 15156. Visit our Frequently Asked Questions sections to access more information on NACE MR0175.
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Question: We are trying to identify the MR0175 hardness requirements for P1, Group 2 Carbon Steel (and not A105 or A234) for Pipe, Plate, Fittings, and Pressure vessels. The source of confusion: a) A.2.1.2 identifies a hardness requirement of Rc 22. b) A.2.2.2 states that P-No 1, Group 1 pressure vessel steels are “acceptable.” Theory A supports a requirement of Rc 22 max. Theory B supports that “acceptable” means “acceptable at any hardness,” i.e., there is no maximum hardness requirement for P-No 1, Group 2 material. Which theory is correct? (Note: Our part of interest, a rupture disc holder, seems to fit under both “Pipe, plate and fittings” and “Pressure Vessel.”)
The Section A.2.2 pertains to the application of the general guidelines to product forms such as pipe, plate and fittings. Section A.2.2.1 states that “Except as modified below, the general requirements of A.2.1 shall apply to all product forms”. There are no exceptions listed in Section A.2.2.2 and Table A.2 that permits exception to the 22 Rockwell C hardness limit. The requirement for 22 Rockwell C maximum remains in effect.
This question is in relation to NACE MR0175/ISO 15156-2 Annex A.2.1.2 and A.2.2.2
Reference: ISO 15156 Maintenance Panel Inquiry #2015-01