We are experiencing corrosion of a side stream in coker fractionator. Earlier used CS pipe was replaced with SS-321 pipes which failed due to pitting corrosion.
Does anybody have similar experience? What is the probable reason of the failure?
Answers
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07/12/2009
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Eric Vetters, ProCorr Consulting Services, ewvetters@yahoo.com
Most likely cause is ammonium chloride, especially if you are running a fuel coke operation and run low fractionator overhead temperatures. Ammonium chloride deposits in the tower and then gets carried out with side streams, especially the coker distillate side cut.
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23/11/2009
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Morgan Rodwell, Fluor Canada Limited, morgan.rodwell@fluor.com
One would need more information on this problem to diagnose. Which side stream? What are the key parameters of the fluid (e.g. sulfur, TAN)? Is the corrosion limited to hot sections?
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23/11/2009
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AMIYA LAHIRI, AK Associate, lahiri04k@rediffmail.com
Unless the concerned side stream and process details are given it is not possible to give a meaningful answer.
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