NACE H2S Upper Limit 2

[jackboot]

I have searched this topic and I can't find the information.

Question:
Is there an upper concentration limit for the NACE MR0175?

Example:
I can see that for carbon steels Rc22 is the max hardness to operate in the SCC zone as depicted by MR0175. But the charts in MR0175 show a limited pressure range and concentration range.

So - would I still be good with this standard if I know that I would be operating at 50% H2S at 10,000 psi? It would definately be in the SCC zone, but would the concentration and the pressure affect the Rc22 rule?

Please advise.

jackboot

 

[CoryPad]

I have been involved in much SSC testing of steels for oil/gas production. The upper limit hardness is a function of pH and H₂S concentration. There isn't much published on this. Since steel with 22 HRC hardness can withstand 100% H₂S (e.g. testing according to NACE TM0177), you should be okay with the 50% concentration.

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[jackboot]

Thanks for the information.