دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a portable mast constructed of tubular members. A pole mast may be a single pole, usually of two different sizes of pipe telescoped together to be moved or extended and locked to obtain maximum height above a well. Double-pole masts give added strength and stability. See mast.

n: the portable derrick that made of tubes.