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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsGeneral Corrosi...General Corrosi...Corrosion on Desalination unitCorrosion on Desalination unit
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3/7/2007 9:00 AM
 
Hi gents, we are facing big problems with our desal unit, inlet and reject line are Duplex 2205 where in product line is 316. since the first startup 13 months ago, most of weld joints have leaked plus many pits in bare material. the condition of duplex is as worse as 316. till now I am not sure is it chloride attack or Microbioligical attack as our EPC contractor concluded! what shall I do to recognize the cause of corrosion
 
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3/13/2007 9:00 AM
 
Dear Nabhan: The corrosion of duplex and 316SS in desalianation service could conceivable be due to either chlorides or bacteria (MIC). The pitted appearance can be similar although some people report subtle differences for MIC pitting. You need to conduct a proper failure analysis, if practical, and look at those things that can distinguish between pure chloride pitting and pitting from MIC. Things like taking water samples and testing for bacteria should be done, analyzing deposits, checking the oxygen content of the water, the flow velocities, all might provide some clues. Hope this helps! David Hendrix The Hendrix Group Inc.
 
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