UNI-DIRECTIONAL PIPELINE PIG AND PIPELINE ASSEMBLIES
    10.
    发明公开
    UNI-DIRECTIONAL PIPELINE PIG AND PIPELINE ASSEMBLIES 审中-公开
    单向管道清洗猪和管路布置

    公开(公告)号:EP2760597A1

    公开(公告)日:2014-08-06

    申请号:EP12836891.7

    申请日:2012-08-30

    申请人: Doig, Ian Dracup

    发明人: Doig, Ian Dracup

    摘要: Pigs (10) are propelled forwards by a propulsion fluid in a pipeline (21). The pigs (10) have an upstream end (13), a downstream end (11), and an intermediate section (12). The intermediate section has a variable geometry chamber (16) associated therewith and one or more outwardly extending external pawl teeth (15). The pawl teeth are automatically displaceable outwardly relative to a longitudinal axis (9) in response to a pressure differential between a downstream pressure and an upstream pressure. The pig is configured such that a change in a geometry of the chamber in response to the pressure differential between the downstream pressure and the upstream pressure causes the one or more pawl teeth to automatically displace outwardly when the upstream pressure is less than the downstream pressure. When the pawl teeth are deployed, upstream displacement of the pig is inhibited. Various related systems (5) and methods are also disclosed.