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Material Selection For Corrosive And High Chlorides Fluid


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#1 eyedealogist

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Posted 20 January 2015 - 01:57 AM

Hi,

 

I am currently working on a gas processing plant offer in which the maximum CO2 content in the raw gas shall be taken at 25 mole% and 15 PPM of H2S. The chloride level in water is up to 14,500 mg/L. Operating temperature of the fluid is 250 F and operating pressure is 1186 psig. Client has asked to select appropriate / suitable CRA (corrosion Resistant Alloy) metallurgy of material. Can any one help me in the selection of MOC based on the above mentioned conditions of fluid. Please note that at downstream there is an evaporative cooler which will lead down the temperature up to 135 F. Please guide me regarding the MOC for upstream and downstream of that evaporative cooler. Can i go with SS 316 on theses fluid conditions.



#2 Art Montemayor

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Posted 20 January 2015 - 06:58 PM

In my experience you are asking for Chloride Stress Corrosion on 316SS at the conditions you state.

 

You should normally stay away from using austenitic Stainless Steels if the metal is to come in contact with any chloride-contaminated fluid.  I have used some Columbium-added stainless alloys, such as 347SS.  However, if you have a critical application and need some degree of stainless protection, you should consult the problem with a recognized steel manufacturer as to which alloy is the best to apply.



#3 breizh

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Posted 20 January 2015 - 07:39 PM

Hi ,

Agree with Art , you should consult companies like Sandvick or ThyssenKrupp and others to support your query . I don't think SS316 is suitable .Take a look at Uranus B6 , SAF2205 ,2304 ,2507 .

 

You really need to get advice from manufacturer !

 

Breizh



#4 eyedealogist

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Posted 21 January 2015 - 01:26 AM

Thanks guys for your help. I have also consulted some material experts and most of them suggested to go with 22Cr duplex stainless steel for this service.



#5 Jiten_process

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Posted 28 January 2015 - 03:45 PM

Also look about the possibility of alloy 825. This is also widely used alloy in oil and gas facilities

#6 rahulavyas

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Posted 28 January 2015 - 10:10 PM

SS316 is susceptible to chloride stress corrosion cracking. One should go for duplex steel in this case. Also refer API 571 for selection of metallurgy and degradation mechanism for it .






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