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Remedial Measures to Tame the Frost Heaves at Gas Distribution Stations in West-East Gas Pipeline

[+] Author Affiliations
Daoming Deng, Jing Gong

China University of Petroleum, Beijing, China

Xiaoping Wang, Kai Li, Yongtao Jiang

West-East Gas Pipeline Company, Shanghai, China

Paper No. IPC2010-31261, pp. 83-90; 8 pages
doi:10.1115/IPC2010-31261
From:
  • 2010 8th International Pipeline Conference
  • 2010 8th International Pipeline Conference, Volume 4
  • Calgary, Alberta, Canada, September 27–October 1, 2010
  • Conference Sponsors: International Petroleum Technology Institute and the Pipeline Division
  • ISBN: 978-0-7918-4423-6 | eISBN: 978-0-7918-3885-3
  • Copyright © 2010 by ASME

abstract

The first West-East Gas Pipeline, running from the Tarim Basin gas fields in Xinjiang to the Yangtze River Delta area in China, is an 1016-mm-dia, 3900-km-long pipeline, the design capacity and pressure of which are 12 billion cubic meters annually and 10 MPa respectively. The whole pipeline was put into commercial operation on Oct. 2004, and the distribution stations suffered from frost heaves due to subfreezing gas temperatures, with obvious uplifts of valves from the bases, upheavals of the ground, and cracks of the paved surfaces and fence walls, and deformations of gas pipelines. From the commission on, the demand on gas in the downstream market was booming, and the company strove to upgrade the throughput to 17 billion cubic meters annually by building new gas compressor stations, so the more serious frost heaves are expected at the regulator stations. As we know, gas-fueled heaters can effectively tackle the frost heaves, but the difficulty of land acquisition, and more expensive CAPEX and OPEX limit the installation of the gas-fueled heaters. In this paper, various types of measures to cope with the frost heaves are compared and analyzed. Based on the geotechnical survey of field soils, theoretical calculations and actual data, soil replacement schemes with a water migration control technique are developed and successfully applied at different gas distribution stations with different water tables. The schemes are simple to use, and are cost-effective. When the remedial actions with this scheme are conducted, no interruptions of service are required. Furthermore, a large sum of expense is saved in comparison with the gas-fueled heaters.

Copyright © 2010 by ASME
Topics: Pipelines

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