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    Method of locating pipeline leaks with a one-way pig
    1.
    发明授权
    Method of locating pipeline leaks with a one-way pig 失效
    用一种方式定位管道泄漏的方法

    公开(公告)号：US3903730A

    公开(公告)日：1975-09-09

    申请号：US41300873

    申请日：1973-11-05

    申请人： EXXON PRODUCTION RESEARCH CO

    发明人： MATTHEWS JR JAMIE F ,  MCDONALD WILLIAM M

    IPC分类号： G01M3/00 ,  G01M3/28 ,  G01M3/08

    CPC分类号： G01M3/005 ,  G01M3/2823

    摘要： A method of testing liquid-filled pipelines for leaks by introducing a one-way pigging device into one end of a pipeline and positioning the pigging device at successive locations along the length of the pipeline by hydraulic pressure applied at the same end of the pipeline. At each location, testing pressure is introduced from the opposite end of the pipeline thereby indicating the location of any leaks in the pipeline. The one-way pig moves in response to a pressure differential in one direction and becomes anchored at a location in response to a pressure differential in an opposite direction.

    One-way pig means
    3.
    发明授权
    One-way pig means 失效
    一点意思

    公开(公告)号：US3903728A

    公开(公告)日：1975-09-09

    申请号：US41300773

    申请日：1973-11-05

    申请人： EXXON PRODUCTION RESEARCH CO

    发明人： MATTHEWS JR JAMIE F

    IPC分类号： F16L55/16 ,  B08B9/04 ,  B08B9/053 ,  B08B9/055 ,  F16L55/18 ,  G01M3/00 ,  G01M3/08

    CPC分类号： B08B9/0557 ,  F16L55/18 ,  G01M3/005

    摘要： A one-way pig means adapted for travel through a pipeline in one direction and useful, for example, in the recovery of marine pipelines or the detection of pipeline leaks is provided in which the pipeline pig advances through a pipeline under the action of a differential fluid pressure in one direction but upon action of a differential fluid pressure from the opposite direction the pig engages the walls of the pipeline thereby resisting movement. The one-way pig engages the inside wall of the pipeline by the wedging action of a disc-shaped, rigid plate against a resilient pigging cup providing a tight, leakproof seal through such wedging action. The wedging action increases as the differential fluid pressure increases.