| 摘要 |
A pipeline pig (1), and method for installing a liner into a pipework, the pipeline pig comprises longitudinal inner (7) and outer (6) walls, and end walls (10, 12), said inner and outer walls being of substantially annular arrangement in transverse section, the pipeline pig being such that, in use, space enclosed by said walls is filled with fluid, and when a pressurising fluid is applied to the rearward end of the pipeline pig the pig advances through the pipeline by way of substantially radial portions of the walls moving in respective endless loops. The pipeline pig exerts a radially outward pressure to a liner (16) so as to urge said liner against an inner surface (40) of the pipework. The inventive pipeline pig can also be used to clear unwanted material from a pipework.
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