دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

well pulling hoist.

water quality act.

n: a flat area on an otherwise round fitting to which a wrench can be applied (as on sucker rod coupling). Also called a wrench square.

n: see wrenchflat.

n: in an engine, the hard steel, hollow cylinder that attaches the piston to the piston rod. A circular opening in the piston is lined up with a corresponding circular opening in the rod and the wrist pin is pushed through the openings. Usually, special keys on each end of the pin lock the pin in the piston. Also called piston pin.

wireline removable insert valve.