Long term durability of composite pipeline repairs

Proceedings Publication Date:

05 Sep 2016
Presenter
James Knights
Presenter
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Author
James Knights
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Abstract
There are many different ways that an operator can manage wall thinning of their asset prior to leaking. One method is to remove the line from service, empty the line, cut out and then replace the damaged section of the pipeline – this method is costly and reduces the operating profits of the asset. Another method is to weld a metal sleeve over the damaged section of pipe – this method involves hot-work and risks burning through the pipe and can induce micro-cracking, in addition to this the defect is not constrained by the sleeve and will continue deforming within its plastic limit. Alternative a different method to permanently repair the pipeline is to install a composite sleeve. Composite sleeves can be installed on the pipeline without hot work while the line is in service and will fully constrain a defect on the pipeline. In the last decade the composite sleeve repair of pipelines have been integrated into the ASME 31.4 (The American Society of Mechanical Engineering 2009) and B31.8 (The American Society of Mechanical Engineering 2010) standards. Globally composite sleeves are used to repair corrosion defects on pipelines in over seventy-six different countries. Over half a million composite sleeve repairs have been completed to date. With reference to literature written by the Gas Research Institute (GRI) and pipeline operators this paper highlights at some of the more challenging and unusual composite sleeve repairs made in Asia, the USA and Europe, explains how they work and how they were deemed to be valid with a minimum lifetime of 50-years

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