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clperera
Commentator

Join Date: May 2010
Posts: 63

H2S Partial Pressure and HIC / SOHIC Cracking

04/13/2011 6:27 AM

Is it possible to have HIC / SOHIC cracking when the H2S partial pressure is LESS than 0.0003MPA (0.05 psia), noting that H2S content is GREATER than 100 ppm Mol or Wt%?

Secondly, is it possible to get HIC / SOHIC cracking in gas phase (wet H2S gas; i.e. small amount of moisture present)?
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znpyro
Active Contributor

Join Date: Jan 2008
Location: Budapest, Hungary
Posts: 18
Good Answers: 1
#1

Re: H2S Partial Pressure and HIC / SOHIC Cracking

04/14/2011 1:40 AM

What kind of material do you have? Carbon steel? Stainless steel? Duplex?

Do you have information about the temperature?

Tibor
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clperera
Commentator

Join Date: May 2010
Posts: 63
#2
In reply to #1

Re: H2S Partial Pressure and HIC / SOHIC Cracking

04/14/2011 1:53 AM

Sorry, The material is Carbon Steel and s/steel. The temperature is ambient to 150 DegC.

Also as an addition to my previous question, can HIC / SOHIC occur in both gas Phase and liquid Phase OR only in liquid phase

Also if you have susceptibility info on Duplex that would be useful as well.

Thanks in anticipation.
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Mounir
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Join Date: Apr 2011
Location: Tunisia- North Africa
Posts: 4
Good Answers: 1
#3
In reply to #2

Re: H2S Partial Pressure and HIC / SOHIC Cracking

04/14/2011 5:07 AM

-HIC/SOHIC can occur in any phase in which presence of free water (liquid droplets) is possible, so for gas or liquid this corrsion type could be detected & therefore it shall prevented. For gas phase, vaporized water in streams with corrosive compounds (H2S, CO2, S,...) at a temperature above dew point (difference of 20°C or more) is considered non corrosive.

-I know that Duplex is usually recommended to withstand sour service conditions with presence of chlorides.
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