دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: A type of fluid pump in which the displacement volume of the pump is fixed for each rotation of the pump. Generally associated with high-pressure applications, positive-displacement pumps are commonly used in drilling operations to circulate the drilling

n: a reciprocating or a rotary pump that moves a measured quantity of liquid with each stroke of a piston or each revolution of vanes or gears. positive-pressure self-contained breathing apparatus (SCBA) n: a face mask and portable air tank used for the purpose of breathing in contaminated atmospheres.

n: the machine that imparts reciprocating motion to a string of sucker rods extending to the positive-displacement pump at the bottom of a well. It is usually a beam arrangement driven by a crank attached to a speed reducer.