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51316-7715-Dead Leg Internal Corrosion Management

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Product Number: 51316-7715-SG
ISBN: 7715 2016 CP
Author: Lynsay Bensman
Publication Date: 2016
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$20.00
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Internal corrosion in dead leg and low flow pipe segments is a leading cause for pipe-related failures in pipeline facilities such as pump stations compressor stations and terminals. Corrosion management of these pipe segments is challenging because they are generally unpiggable difficult to chemically treat and susceptible to several internal corrosion mechanisms. This paper identifies common causes of internal corrosion dead leg and low flow pipe segments and discusses corrosion management practices including threat assessment for prioritization of segments and/or determination of the need to perform monitoring and/or mitigation as well as mitigation techniques that can be used to minimize the impact of corrosion. Line flushing one of the mitigation techniques that can be utilized is discussed including an overview of solids flow models available to determine minimum velocity for flushing along with application challenges that need to be consider prior to implementing flushing. Approaches to inspection of dead legs are also discussed.
Internal corrosion in dead leg and low flow pipe segments is a leading cause for pipe-related failures in pipeline facilities such as pump stations compressor stations and terminals. Corrosion management of these pipe segments is challenging because they are generally unpiggable difficult to chemically treat and susceptible to several internal corrosion mechanisms. This paper identifies common causes of internal corrosion dead leg and low flow pipe segments and discusses corrosion management practices including threat assessment for prioritization of segments and/or determination of the need to perform monitoring and/or mitigation as well as mitigation techniques that can be used to minimize the impact of corrosion. Line flushing one of the mitigation techniques that can be utilized is discussed including an overview of solids flow models available to determine minimum velocity for flushing along with application challenges that need to be consider prior to implementing flushing. Approaches to inspection of dead legs are also discussed.
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Proactive Corrosion Management for Dead-legs

Product Number: 51319-13290-SG
Author: Mohammed Al Shahrani
Publication Date: 2019
$20.00

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
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The Importance of Deposit Characterization in Mitigating UDC and MIC in Dead Legs

Product Number: 51317--9128-SG
ISBN: 9128 2017 CP
Author: Christopher Kagarise
Publication Date: 2017
$20.00

Under deposit corrosion (UDC) and microbiologically influenced corrosion (MIC) are threats to dead legs and low flow/intermittent flow pipelines.  Deposit characterization methods, corrosion mechanisms, mitigation methods and monitoring are addressed.
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51314-3834-Pipeline Integrity Management Through Internal Corrosion Monitoring

Product Number: 51314-3834-SG
ISBN: 3834 2014 CP
Author: Abdul Razzaq Al-Shamari
Publication Date: 2014
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