| 摘要 |
<p>A pipeline pig has a nose, a central section having a central axis, a plurality of fins extending rearwardly from the central section, each of the plurality of fins having a pressure responsive scraping end; the scraping ends of the plurality of fins collectively define a circular scraping surface extending radially outwardly from the central axis of the central section; each of the fins having inward facing pressure bearing surfaces; and at least a flow-through passage extending between the fins.</p> |
