Evaluation of various non destructive testing methods to identify flange face crevice corrosion in process equipment and piping

Crevice corrosion is a well-known damage mechanism in Oil Gas facilities and is caused by a concentration of corrosive substances within a confined space. The crevice between two adjoining flanges is the ideal environment for initiation of crevice corrosion. Because of the concentration of these corrosive substances in a localized area, rate of corrosion gets accelerated. When flanges are used in very corrosive environments such as sea water, acid service & H2S concentrated drain piping the flange face is particularly susceptible. Corrosion of the sealing area can cause loss of containment and therefore have the potential to cause are lease of product with potentially catastrophic consequence. This paper is the outcome of a evaluation study discussing the various Conventional & Advanced Non-Destructive methods currently available in the industry in order to detect the flange face crevice corrosion while the piping/equipment in service for normal operating temperature. The same is seen as valuable information for all oil and gas operators in the region and worldwide.