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Title: British Gas on-line inspection experience
Category: Pipeline Industries Guild technical library
Downloadable: Yes 
Catalog No.: PIG0068
Date of Publication: January 1, 1981
Price: $25.00 US
Authors: G Clerehugh, R W Shannon and L Jackson
Abstract: British Gas has concluded from studies of defect behaviour and operational experience that on both technical and economic grounds periodic non-destructive evaluation of its gas transmission pipelines is to be preferred to overload (hydrostatic) testing as a means of assessing their structural integrity. Following a period of development, an inspection service to detect and size gross metal loss in 24 inch pipelines was introduced in 1977 and to date some 1892 miles of this and other sizes of line have been surveyed.

This paper reviews the inspection philosophy upon which vehicle design is based and the operational experience and performance achieved through its use. It is concluded that the inspection principles adopted by British Gas for both metal loss and cracking and the equipment engineered to allow their application to pipelines meet the performance requirements of a condition monitoring system. Work to extend the technologies to a range of pipeline diameters and provide an inspection service to other operators are also described.

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