One of the sour water filter PSV down steream(D/S) and it's by-pass line having severe corrosion. The pipe line has a nominal wall thickness of 5.54 mm and now it is measured only 1.1 mm (4.44 mm loss due to corrosion). Since the line is D/S of PSV and it's by-pass, the line is not used (used when PSV pop-up) and also since the D/S pipe line join with the inlet header, it is not easly repairable unless a total shut down. I want to know how to avoid this type of corrosion as a proactive measures for other pipe line. Even if we open by-pass line manually at regular interval what about PSV discharge line.
Thanks in advance.