NACE - Qualification of material for H2S service

[ThomasTe]

Hi,

I woul like to qualify a martensitic stainless steel which isn't listed in MR0175-part 3. I have a question to users of the NACE MR0175 norm.
Because that kind of material is considered as corrosion-resistant alloy (CRA), I am not sure of the right thing to do.

First, CRA are described on MR0175-3, and the only description to qualify these materials is given on annex B (by using Annex E and TM0177). That annex explains how to qualify it by laboratory service.

Moreover, paragraph 8.2 from MR0175-1 gives requirements for a qualification based upon field experience. Contrary to MR0175 - part 3 which is specific to CRA, part 1 deals with materials in general for H2S environment.

Do I really have to use MR0175 part 3 ? Or is it possible to follow simply MR0175 part 1 requirements ?

 

[SJones]

If you cannot use the Annex A tables of Part 3, you have the two options available to you that are stated in Part 1, and reiterated in subclause 6.1, paragraph 5 of Part 3: documented service experience, or laboratory testing.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

 

[jbeckhou]

Did you manufacture a "new" type of stainless?

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