term includes any collection, treatment, storage, and distribution facilities under control
of the operator of such system and used primarily in connection with such system, and
any collection or pretreatment storage facilities not under such control which are used
primarily in connection with such system.
Pump. A mechanical device for causing flow, or for raising or lifting water or other fluid,
or for applying pressure to fluids.
Pump, Air-Lift. A pump, used largely in lifting water from wells, where air under
pressure is discharged into the water at the bottom of the well in fine bubbles, which
mix with the water and reduce the apparent specific gravity of the air-water mixture.
The surrounding water causes the resulting mixtures of water and air to rise in the
discharge pipe to the outlet.
Pump, Booster. A pump installed on a pipeline to raise the pressure of the water on the
discharge side of the pump.
Pump, Centrifugal. A pump consisting of an impeller fixed on a rotating shaft and
enclosed in a casing, having an inlet and a discharge connection. The rotating impeller
creates pressure in the liquid by the velocity derived from centrifugal force.
Pump, Displacement. A type of pump in which the water is induced to flow from the
source of supply through an inlet valve and into the pump chamber by a vacuum
created by the withdrawal of some physical device which on its return displaces a
certain volume of the water contained in the chamber and forces it to flow through the
discharge valves and discharge pipes.
Pump, Piston. A reciprocating pump; wherein the cylinder is tightly fitted with a
Pump, Plunger. A reciprocating pump which has a plunger that does not come in
contact with the cylinder walls, but enters and withdraws from it through packing
glands. Such packing may be inside, outside, or outside the center; according to the
design of the pump.
Pump, Regenerative Turbine. A centrifugal pump where the velocity energy of the
water is partially converted into pressure head as it leaves the impeller, by fixed guide
Pump, Reciprocating. A type of displacement pump consisting essentially of a closed
cylinder containing a piston or plunger, as the displacing mechanism, drawing liquid
into the cylinder through an inlet valve, and forcing it out through an outlet valve.
When the piston acts on the liquid in one end of the cylinder, the pump is termed
single-action and when it acts in both ends, it is termed double-action.