دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: two bands fined with brake pads;the bands fit over the two rims of the drawworks drum. When the driller engages this brake, the pads press down on the rims to stop the drum from hoisting or from letting out drilling line. The main brake also keeps the drum from rotating (and therefore holds the drill stem stationary) when making up or breaking out drill pipe.

n: the brake that resorts the friction of brake block and brake drum. Mainly formed by lever, brake staple, brack block and balance beam.