Field work cuts threat to suspended pipeline

Field experiments have reduced the likelihood of damage or failure of a suspended gas pipeline span as a result of pigging. The potential displacement and vibration caused by pigging pose particular problems in suspended spans. Great enough displacement or vibration could create deformation of the line or failure.The Fujiang pipeline bridge on the north main line of the Sichuan natural gas transmission network lies about 200 m upstream of the main Fujiang river bridge. Fig. 1 shows the structure of the Fujiang pipeline bridge. The bridge uses two 50-m towers, with the pipeline suspended by diagonal cables. The main pipe span measures 320 m. The two spans running between each tower and the...

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