NACE MR 01-75 and NACE MR 01-03 2

[abbver98]

What is the difference between the NACE MR 01-75 and NACE MR 01-03.
The new version of the standard NACE MR 01-75 doesn't specify classes (Class I, II, III) as it was before. To what those classes refer ?

Thanks,

 

[SJones]

MR0175 (ISO 15156) is for upstream, exploration and production environments whereas MR0103 is for downstream refinery environments.

Steve Jones
Materials & Corrosion Engineer

http://www.pdo.co.om/pdo/

 

[PAN]

There is a paper described about the difference.

NACE Paper 04649, "An Overview of NACE International Standard MR0103 and Comparison with MR0175", Corrosion 2004

 

[TomEun]

MR0175-03: There are four classes (Region 0, 1, 2, and 3 in Fig.1) per sour severity.
Region 0 (PH2S<0.05psi)- No precaution. But may be considerable tensile strength limit, geometry effect (avoid stress concentration structure), etc.(seepara 7.2.1.3)
Region 1 - apply para A.2, A.3, or A.4
Region 2 - apply para A.2 or A.3
Region 3 - apply para A.2

MR0103-03: Find below article (Hydrocarbon Processing, p73-77, November 2004)- summarized paper

http://www.documentation.frco.com/g...articlesreprints/nace_standard_mr103_bush.pdf

Thomas/NACE Corrosion and Materials Selection/Design Specialist