دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a reciprocating pump with two pistons or plungers and used extensively as a mud pump on drilling rigs.

n: A reciprocating positive displacement pump having two pistons that are double-acting. Used as the circulating pump on some older drilling rigs.

a type of pump with two, dual acting pistons.