دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a wireline sheave, or pulley, that is fastened to the ground anchor and that changes a horizontal pull on a wireline to a vertical pull (as in swabbing with a derrick over a well). See block.

n: wire rope idle wheel attached to anchorage block is use to change the horizontal pull of wire rope as vertical pull 。