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  • An operating history of turboexpanders in the supercritical fluid regime
    1994
    Co-Authors: Nivol G
    Abstract:

    Mobil North Sea Ltd. operates the SAGE Gas Terminal at St. Ferus in Grampian Region, Scotland on behalf of the SAGE partners. When Phase B is completed in 1994, the Gas plant be capable of treating 1150 MMSCFD of sour natural Gas from three different North Sea producing areas. Treated Pipeline to the Shell NGL fractionation plant at Mossmorran. In order to meet Pipeline Gas Specifications over a wide range of flowrates and feed Gas compositions, single-stage turboexpander chilling was selected over Joule-Thomson valve expansion. Four turboexpanders (2 per process train) operate in parallel to achieve ther required performance over the entire flow range of 90-575 MMSCHD per process train. Unusual operating condition for the turboexpanders include dense phase inlet Gas, expandion near the criondenbar, and high equilibrium liquid content at the exhaust (up to 50% by weight). The two turboexpanders in each share common suction and discharge facilities as do their associated brake compressors. This paper discusses details of the appliaction including commissioning, start-up, and operation.