Karthik FG line and fittings - pitting corrosion seen could be due to internal condensation or H2S related internal pitting corrosion or quite possible externally caused due to atmospheric environmental marine /salt or corrodent contaminant deposit (external pitting). If you observe internal pitting then it could be due to condensation effect. If you observe both, internal and external pitting, then process or shut down improvement may be needed . This depends on the number of times the FG line is taken out of service and on the external corrodent effect seen in your plant. If you observe only external pitting then protective epoxy paint surface protection may solve the problem. Hope this helps C.V.Srinivasan Nishi Engineers Pvt Ltd India March 24, 2009 E-mail: nishi@vsnl.com >we are getting pitting corrosion on Fuel Gas pipe line and >fittings, what will be the better solution to avoid this or >reduce this kind of problems, > >regards, >karthik,

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