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Foothills Decompression/Recompression Facilities Unique Power Recovery Application in Gas Pipelines FREE

[+] Author Affiliations
Stanley R. Kitt

Foothills Pipe Lines Ltd., Calgary, AB, Canada

Bruce D. Rose

AMOCO Canada Petroleum Company Ltd., Calgary, AB, Canada

Paper No. 92-GT-026, pp. V003T07A005; 14 pages
doi:10.1115/92-GT-026
From:
  • ASME 1992 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 3: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations
  • Cologne, Germany, June 1–4, 1992
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7895-8
  • Copyright © 1992 by ASME

abstract

Foothills Pipe Lines Ltd. is the Canadian sponsor of the Alaska Natural Gas Transportation System (ANGTS), a pipeline project selected in Canada and the United States as the means for transporting Alaskan gas reserves to the lower 48 United States. Currently, certain Prebuild portions of the ANCTS are in operation delivering Canadian gas to U.S. markets.

Recent system expansion of the Eastern Leg Prebuild to accommodate increased Canadian gas exports entailed the construction of Decompression/Recompression facilities at Empress, Alberta to enable high pressure operation of the Foothills pipeline while maintaining gas stripping at existing low pressure extraction plants. The general process of the Decompression/Recompression facilities involves the expansion of high pressure pipeline gas to conditions acceptable to the low pressure extraction plants, then the recompression of the residue gas for return to the pipeline at original pressure. By directing the inlet gas through turbo expanders coupled to brake compressors, a substantial portion of the expansion energy is captured and used in providing the first stage of gas recompression. Including supplemental conventional compression, the Decompression/Recompression facilities are capable of providing approximately 37 MW (50 000 HP) for continuous gas recompression.

Although power recovery with turbo expanders is relatively common in the gas processing industry, such application for gas recompression in large gas pipelines is unique. This technical paper describes the Foothills Decompression/Recompression facilities with their utilization of turbo expanders for pipeline recompression service, emphasizing the process design as well as the characteristics of the rotating equipment.

Copyright © 1992 by ASME
Topics: Pipelines
This article is only available in the PDF format.

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