Celebrate World Corrosion Awareness Day with 20% off eCourses and eBooks with code WCAD2024 at checkout!
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.
We are unable to complete this action. Please try again at a later time.
If this error continues to occur, please contact AMPP Customer Support for assistance.
Use this error code for reference:
Please login to use Standards Credits*
* AMPP Members receive Standards Credits in order to redeem eligible Standards and Reports in the Store
You are not a Member.
AMPP Members enjoy many benefits, including Standards Credits which can be used to redeem eligible Standards and Reports in the Store.
You can visit the Membership Page to learn about the benefits of membership.
You have previously purchased this item.
Go to Downloadable Products in your AMPP Store profile to find this item.
You do not have sufficient Standards Credits to claim this item.
Click on 'ADD TO CART' to purchase this item.
Your Standards Credit(s)
1
Remaining Credits
0
Please review your transaction.
Click on 'REDEEM' to use your Standards Credits to claim this item.
You have successfully redeemed:
Go to Downloadable Products in your AMPP Store Profile to find and download this item.
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