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Title: In-service recoating of a 40-in crude oil pipeline in Kazakhstan
Category: Technical papers from the Journal of Pipeline Engineering
Downloadable: Yes 
Project No.:
Research Agency:
Catalog No.: 2152s
Date of Publication: Dec 1 2008 12:00AM
Price: $25.00 US
Authors: Sidney Taylor
Abstract: >THE CPC pipeline is owned by a consortium of Russia, Kazakhstan, Oman governments, Chevron, and a number of other companies. They started construction in 1998 and the pipeline became operational in March, 2001. It was initially designed to deliver 28.2 million tons of crude annually with planned expansions that would bring annual exports to 67 million tons.

Built to Russian/Kazakh standards, the pipeline was coated with cold applied tape. Part of the pipeline route runs close to the Caspian Sea. In some areas the pipeline is below the water table and completely immersed in brackish water. They are now experiencing severe corrosion in several areas because: the wrong coating was selected initially, poor-quality materials were used, there was a poor application technique (no surface preparation prior to application), soil stresses damaging the coating, and the salt water environment accelerated the corrosion rate.

Areas of the pipeline are being recoated by a Russian contractor who is able to recoat about 150 linear meters of pipe per day with the line in service. This paper describes the methods being used to excavate the pipeline, remove the existing coating, prepare the surface of the pipe, and apply the new coating.

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