... aquot;hard scaleaquot; pigs were tested. ln most cases the brush pigs required multiple passes through the lines and the use of cool brine to propel them. ... This process can take 6 to 12 hours and could sometimes be repeated two or three times per line cleaning! ... repair, operate and track, but also to incorporate pivotal roller supports, metal propulsors and tool guides. ... GRC BULLETIN Augiist/September 1996.
|Title||:||Geothermal Resources Council Bulletin|