FLDP meaning in oil and gas

Positive Displacement Pumps has an expanding cavity on the suction side and a decreasing cavity on the discharge side. Liquid flows into the pumps as the cavity on the suction side expands and the liquid flows out of the discharge as the cavity collapses. The volume is constant given each cycle of operation. The positive displacement pumps can be divided in two main classes •reciprocating •rotary The positive displacement principle applies applies whether the pump is a •rotary lobe pump •progressing cavity pump •rotary gear pump •piston pump •diaphragm pump •screw pump •gear pump •vane pump •regenerative (peripheral) pump •peristaltic