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Title: Intelligent Pigging Of Pipelines-A British Approach
Author: R. W. E. Shannon
Source: American Gas Association 1988
Year Published: 1988
Abstract: Pipeline metal loss inspection entered a new era with the introduction by British Gas of a technologically advanced magnetic flux leakage system. This equipment is capable of detecting and sizing defects accurately and can be used with confidence to provide a lower cost, technically superior assessment of pipeline condition than that achieved through hydrostatic testing. The inspection of pipelines for stress corrosion cracking also has been the subject of much research by British Gas. Prototype inspection equipment has been developed and operated under live gas conditions in pipelines to date the results prove that a crack-detection sensitivity equal to pressure testing has been achieved. Some pipeline steels however, are highly responsive to elastic waves of ultrasonic frequency, and current research is directed towards the development of improved computer based data analysis systems. This work will enable acceptable levels of defect detection to be adopted whilst the risk of generating false indications is avoided. The development program undertaken by British Gas to date will be reviewed along with operating experiences over the last ten years. The technical and financial benefits of employing such an advanced system of pipeline surveillance will be indicated.

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