9 June 2000 20 years of life integrity of a high-pressure natural gas pipeline using strain gages
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A high-pressure natural gas-pipe-line runs underground a valley of a river in a geological unstable area on the northern outskirts of the Alps. To get the permission to establish and to operate the pipe-line, the local authorities demanded for an information system which makes it possible to detect additional mechanical stresses in the pipe-line due to unspecified bending moments caused by the sudden gliding of the soil stratum. It was decided to use strain-gages as stress-transducers. They were bonded 20 years ago to the surface of the pipe at 8 important areas, protected against humidity and damage, wired to a measuring station on an island in the river and connected with a telephone modem to the control station of the gas company. The strains were monitored continuously, recorded and so available for assuring structural integrity of the pipe-line. When maximum allowable strains (stresses) would be exceeded there was a chance to close two pipeline valves at both sides of the river. The experiences showed, that long-time monitoring of strain-gage- signals can be used as cost-effective inspection tool for older equipment to detect possible environmentally induced damage, to assess the life integrity of the pipeline.
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Heinz-Dieter Joas, Heinz-Dieter Joas, } "20 years of life integrity of a high-pressure natural gas pipeline using strain gages", Proc. SPIE 3995, Nondestructive Evaluation of Highways, Utilities, and Pipelines IV, (9 June 2000); doi: 10.1117/12.387847; https://doi.org/10.1117/12.387847

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