Info

Power coefficient CP—The group P/po D .

Propeller pumps—The same as axial-flow pumps.

Pump assembly—The pump arrangement in a pumping station.

Pump characteristics—Set of curves that depicts the performance of a given particular pump.

Pump loss—Head losses incurred inside the pump casing.

Pumping—A unit operation used to move fluid from one point to another.

Pumping station—A location where one or more pumps are operated to convey fluids.

Pumping system—The pumping station and the piping system constitute the pumping system.

Radial-flow pump—Pump with an impeller that directly throws the flow radially into the side of the chamber circumscribing it.

Scaling laws—Mathematical equations that establish the similarity of homologous pumps.

Series connection—A mode of connecting more than one pump where the discharge of the pump ahead is introduced to the inlet of the pump following.

Similar or homologous pumps—Pumps where the head, flow, and pressure coefficients are equal.

Similarity, affinity, or scaling laws—The equations that state that the head, flow, and power coefficients of a series of pumps are equal.

Specific speed—A ratio obtained by manipulating the ratio of the flow coefficient to the head coefficient of a pump. Values obtained are values applying at the best operating efficiency.

Static discharge head—The vertical distance from the pump centerline to the elevation of the discharge liquid level.

Static suction head—The vertical distance from the elevation of the inflow liquid level above the pump centerline to the centerline of the pump.

Static suction lift—The vertical distance from the elevation of the inflow liquid level below the pump centerline to the centerline of the pump.

Suction—In a pumping system, the system of elements before the pumping station.

Suction velocity head—The velocity head at the suction side of a pumping system.

System characteristic—In a pumping system, the relationship of discharge and the associated head requirement that excludes the pump assembly.

Total dynamic head or total developed head—The head given to the pump minus pump losses.

Total developed head requirement—The equivalent head loss corresponding to a given discharge.

Total static head—The vertical distance between the elevation of the inflow liquid level and the discharge liquid level.

Transition losses—Head losses in expansions, contractions, bends, and the like.

Turbomachine—Fluid machine that turns or tends to turn about an axis.

Vane pump—A pump in which a vane pushes the water forward as it is being trapped between the vane and the side of the casing.

Volute—Casing of a centrifugal pump that is shaped into a spiral.

symbols

Ch Cq

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