Abstract
Crevice corrosion is caused by corrosive attack on a metal or alloy with a crevice where fluids are trapped and become stagnant. Crevices can occur under gaskets, seals, and washers or in ring-type joint (RTJ) flange grooves. This chapter discusses two case studies. The first one discusses the application of Inconel 625 weld overlay on RTJ flange grooves, sealing areas, and seat pockets where gaskets, seals, and seats are placed to prevent crevice corrosion. The second case study discusses lifting lugs used to transport and handle valves. Screwed-in lifting lugs are temporary and should be removed after valve installation. The threaded holes on the external surface of a valve where lifting lugs are screwed should be filled with a plastic or silicon plug to prevent crevice corrosion.
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