Additionally, for any low-flow locations, a minimum velocity of 1 m/s was maintained where possible. Consequently, both acidic sour water corrosion and wet H 2S damages can be active under these conditions.Ī flushing program was implemented to control the associated corrosion risks. As such this condensation can be highly acidic. Free water, H 2S, CO 2 and other contaminants have the potential for condensation at some locations. The encountered risk was as high as 60% metal loss from the defective dead-legs made of non-hydrogen induced cracking (non-HIC) resistant carbon steel. Severe wall thinning was confirmed by using appropriate non-destructive testing (NDT) technology such as ultrasonic testing (UT). The survey revealed locations where stagnation of oily water containing dissolved carbon dioxide, hydrogen sulfide and possibly oxygen at the center bottom portion of pipes associated with crude stabilization units and natural gas liquids (NGL) compression trains at hydrocarbon processing facility. The identification step entails a comprehensive No Flow/Low Flow (NFLF) survey. A three-step methodology is adopted focusing on identification, control and monitoring. This paper presents a comprehensive program for managing corrosion in dead-legs. Identifying dead-legs and the related corrosion issues continues to be a challenge in the process industry.
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