| 摘要 |
A pipeline-cleaning travelling "pig" ball having a generally spherical main body formed of a resiliently deformable material. The main body of the ball is provided with plurality of discrete, discontinuous, spaced-apart protuberances upstanding from the surface thereof; the protuberances being of a hardness greater than that of the main body. Preferably, the protuberances are spaced substantially uniformly over the spherical surface of the main body. The invention also contemplates the provision of a pipeline-cleaning kit comprising a first lead "pig" ball and a second follower pig ball; the second or follower pig ball having a main body formed of a resiliently deformable material having a hardness greater than the hardness of the main body of the first or leading pig ball.
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