دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a device mounted on the end of the drawworks shaft of a drilling rig. It serves as an auxiliary to the mechanical brake when pipe is lowered into the wen. The braking effect is achieved by means of an impeller turning in a housing filled with water. Sometimes called hydraulic brake or Hydromatic@ brake.

n: a kind of accessorial brake that join with shaft of drilling rig.