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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsMaterial Select...Material Select...Chloride Stress CrackingChloride Stress Cracking
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12/4/2002 9:00 AM
 
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Good Morning - I am currently designing a pressure vessel for oilfield produced water service. Design pressure and temperature is 250 psig @ -40 to 90C. I have specified Low Temperature CS for the vessel material. Operating temperature and pressure is 80Fand 50 psig. Chlloride concentration is expected to be 25,000 ppm. No H2S or 02 expected to be present. I have specificed a glass flake lining for internal coating and it has been suggested that we clad the vessel instead. Is the cladding overkill? In addition, I have included some 316 SS internals that are not pressure bearing (CPI plate packs, sand jetting headers). Will the internals experience failure due to CSC if there is no pressure drop across them? Thanks in advance for your help.
 
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12/4/2002 9:00 AM
 
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Dear Sir: A cladding, depending on the alloy could impart resistance to the high chloride content produced water; however, the coating, if applied correctly, should provide adequate protection at less installed cost. Regarding the use of 316SS internals, at 80F operating pressure, chloride SCC should not be a concern in the absence of H2S and CO2; however, chloride pitting could occur. At a design temperature of 90C, chloride SCC is considered a potential failure mechanism. Hope this helps! David Hendrix The Hendrix Group Inc.
 
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