A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Field work cuts threat to suspended pipelines
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. 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 riverbank measures 150 m. The pipeline consists of 720-mm OD, 12-mm WT steel pipe. Diameters of the cables rage between 22.5 and 45 mm. The towers used welding construction. The cables alone support the pipeline. The pipeline bends 10 m upward at each tower as temperature compensation. The overall structure is highly flexible. The liquids encounterd during pipeline pigging create particularly heavy loads at the bends, heightening the possibility of leaks and damage. This article details both the static and dynamic tests conducted at Fujiang crossing in an effort ot find a scientific basis for drafting vibration absorbing measures. Static tests demonstrated little difference between horizontal and vertical damping ratios and the higher the frequency, the smaller the damping ratio. Dynamic tests showed that the maximum vibration displacement of the Fujiang pipeline crossing did not occur at the middle of the main span, but instead somwhere between the 1/4-mark and the middle.
Field work cuts threat to suspended pipelines
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. 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 riverbank measures 150 m. The pipeline consists of 720-mm OD, 12-mm WT steel pipe. Diameters of the cables rage between 22.5 and 45 mm. The towers used welding construction. The cables alone support the pipeline. The pipeline bends 10 m upward at each tower as temperature compensation. The overall structure is highly flexible. The liquids encounterd during pipeline pigging create particularly heavy loads at the bends, heightening the possibility of leaks and damage. This article details both the static and dynamic tests conducted at Fujiang crossing in an effort ot find a scientific basis for drafting vibration absorbing measures. Static tests demonstrated little difference between horizontal and vertical damping ratios and the higher the frequency, the smaller the damping ratio. Dynamic tests showed that the maximum vibration displacement of the Fujiang pipeline crossing did not occur at the middle of the main span, but instead somwhere between the 1/4-mark and the middle.
Field work cuts threat to suspended pipelines
Li, Chang-jun (author) / Zhu, Xiao-lan (author) / Liao, Ke-xi (author) / Liu, En-bin (author)
Oil and Gas Journal ; 106 ; 66-69
2008
4 Seiten, 3 Bilder, 4 Tabellen, 6 Quellen
Article (Journal)
English
A stability investigation of cable suspended pipelines
| Tema Archive | 1977
Seismic response analysis for spanning structure of suspended pipelines
| British Library Online Contents | 2004
Models to Evaluate Flutter Instability of Cable-Suspended Pipelines
| British Library Conference Proceedings | 1995