In the past ten years, a number of pipeline leak detection systems have been implemented on various operational pipelines. Unfortunately the feedback from pipeline operators illustrates that some of these systems have not performed satisfactorily for the following reasons: - They generate frequent nuisance alarms when there is no leak in a pipeline. - They are difficult for users to understand. - They are expensive to maintain. Consequently, there is a tendency for leak alarms to be neglected and in some cases the systems are switched off completely. This paper examines the application of state-of-the-art technology (ATMOS PIPE) to the 413 kilometre long North Western Ethylene Pipeline, for Shell UK Limited. Following the technical introduction, the paper addresses the performance of the system over the past two years. Experience on this high pressure ethylene pipeline demonstrates that - It is possible to have a reliable real-time leak detection system. - An effective leak detection system need not be highly complicated. - System maintenance cost can be minimised with the use of new technology.
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