Top of the Line Corrosion (TLC)
Please contact Kod Pojtanabuntoeng for more information on TLC research and services.
Top of the line corrosion (TLC) is one of the long standing problems in wet gas transmission pipelines worldwide and it is particularly prevalent in a number of offshore and onshore operations in Asia Pacific. TLC occurs due to the condensation of water vapour at the upper portion of the internal pipe wall as a result of temperature difference between the produced fluid and its surroundings. The condensed water at the top section is believed to be more corrosive than the bottom of the line fluid due to the lack of buffering ions and corrosion inhibitors. TLC mitigation is challenging and the developed strategies have not been shown effective. This is in part due to the difficulty in delivering the conventional corrosion inhibitor to the top portion of the pipe.
To reduce the intensity of this problem, CCEIC has been working towards the understanding of TLC mechanism and its mitigation.
TLC PhD research project
1. An investigation on the top of the line corrosion and its mitigation
PhD candidate: Md Mayeedul Islam
This study investigates the roles of MEG on TLC and explores the performance of different volatile compounds by using a specially designed probe to allow an in-situ electrochemical monitoring at the top of the line surface. The use of Monoethylene glycol (MEG) as a hydrate inhibitor indirectly reduces TLC rate by minimising water condensation rate. The influence of MEG on various aspects of TLC have been investigated; i.e. condensation rate, co-condensation, iron carbonate precipitation, and localized corrosion. The study will lead to an improved understanding of TLC phenomenon in the presence of MEG and potentially a better mitigation approach.