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Proactive Corrosion Management for Dead-legs

Identifying dead-legs and their related corrosion issues continues to be a challenge in the process industry.This paper presents a comprehensive program for managing corrosion in dead-legs. A three-step methodology is adopted focusing on identification control and monitoring. The identification step entails a comprehensive No Flow/ Low Flow (NFLF) survey. The survey revealed dead-legs in locations where stagnation of oily water containing dissolved carbon dioxide hydrogen sulfide and possibly oxygen at the center bottom portion of pipes associated with stabilization units and NGL compression trains at hydrocarbon operating facility. Consequently the stagnant flow condition significantly contributed to a severe wall thinning that was confirmed by using appropriate Non-Destructive Testing (NDT) technology such as Ultrasonic Testing (UT). The encountered risk was 60% metal loss from the base metal of the defective dead-legs.This corrosion was controlled by establishing a flushing program that is implemented by operation and monitored by inspection team. Additionally for low-flow locations a minimum velocity of 1m/s was maintained where possible. In the last step the effectiveness of the program was monitored by conducting full UT-Scanning every three years and then trending the corrosion rates.Key words: dead-legs management system No Flow/ Low Flow (NFLF) survey Ultrasonic Testing (UT) monitoring strategy

Product Number: 51319-13290-SG
Author: Mohammed Al Shahrani
Publication Date: 2019
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$20.00
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51316-7715-Dead Leg Internal Corrosion Management

Product Number: 51316-7715-SG
ISBN: 7715 2016 CP
Author: Lynsay Bensman
Publication Date: 2016
$20.00