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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsOil Refinery Co...Oil Refinery Co...SWS Reboiler tube metallurgySWS Reboiler tube metallurgy
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2/3/2010 9:00 AM
 
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We faced failure of SS 316 L tubes in single stage SWS reboiler during shutdown. Static passivation on shell side was carried out during shutdown before opening the exchanger. We have similar metallurgy in same kind of service in other units and those exchanger tube bundles are giving satisfactory life ( no failure). In the present situation, we would like to upgrade the tube metallurgy to Duplex stainless steel (A 789 UNS 31803). Will it work satisfcatorily? Any one tried this metallurgy in sour water system reboiler. The tube side is LP steam and the max tube design temp is 240.0 deg C . Please give your valuable inputs / suggestions. Thanks & Regards S.Sivasankaran
 
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2/6/2010 9:00 AM
 
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Please elaborate the type of failure whether it is a crack or deep pitting and on which location i.e tube side or shell side. For sour water stripper application 316L will do better job.However,for steam service at this temperature there is a possibility of chloride stress corrosion cracking due to concentration of chloride salts at crevice and baffle location. Further, there is a limitation in using Duplex SS beyond 260 Deg,C and the best choice would be Incoalloy to meet both sour condition as well as steam application.
 
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