centrifugal pump


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Related to centrifugal pump: reciprocating pump

centrifugal pump

[‚sen′trif·i·gəl ′pəmp]
(mechanical engineering)
A machine for moving a liquid, such as water, by accelerating it radially outward in an impeller to a surrounding volute casing.

Centrifugal pump

A machine for moving fluid by accelerating it radially outward. More fluid is moved by centrifugal pumps than by all other types combined. Centrifugal pumps consist basically of one or more rotating impellers in a stationary casing which guides the fluid to and from the impeller or from one impeller to the next in the case of multistage pumps. Impellers may be single suction or double suction. Additional essential parts of all centrifugal pumps are (1) wearing surfaces or rings, which make a close-clearance running joint between the impeller and the casing to minimize the backflow of fluid from the discharge to the suction; (2) the shaft, which supports and drives the impeller; and (3) the stuffing box or seal, which prevents leakage between shaft and casing.

The rotating impeller imparts pressure and kinetic energy to the fluid pumped. A collection chamber in the casing converts much of the kinetic energy into head or pressure energy before the fluid leaves the pump. A free passage exists at all times through the impeller between the discharge and inlet side of the pump. Rotation of the impeller is required to prevent back-flow or draining of fluid from the pump. Because of this, only special forms of centrifugal pumps are self-priming. Most types must be filled with liquid, or primed, before they are started.

Every centrifugal pump has its characteristic curve, which is the relation between capacity or rate of flow and pressure or head against which it will pump. At zero pressure-difference, maximum capacity is obtained, but without useful work. As resistance to flow external to the pump increases, capacity decreases until, at a high pressure, flow ceases entirely. This is called shut-off head and again no useful work is done. Between these extremes, capacity and head vary in a fixed relationship at constant rpm. When the required head exceeds that practical for a single-stage pump, several stages are employed. Multistage pumps range from two-stage pumps to pumps built with as many as 20 or 30 stages for high lifts from relatively small-diameter wells. See Pump, Pumping machinery

centrifugal pump

centrifugal pump
A pump in which the pressure is imparted to the fluid by centrifugal force produced by a rotating impeller.

centrifugal pump

Any pump that uses a high-speed impeller to throw the fluid outward by centrifugal action.
References in periodicals archive ?
Considering the influence of impeller geometry parameters on the centrifugal pump head, efficiency, shaft power, and [NPSH.sub.r], the impeller outlet width, inlet angle, outlet angle, and cape angle are selected as test factors, and four levels are set for each factor, as shown in Table 2.
The presented method optimizes the vibration performance of the centrifugal pump undergoing FSI phenomena, which reasonably take advantages of the FSI simulation, Kriging metamodel and experimental tests.
On the MP 36 and MP 56 centrifugal pumps, a cast-iron impeller, cast-iron volute and ceramic-carbon mechanical seal make up the pump assembly.
Hot-oil systems heat up to 500 F with 12 to 48 kw and have centrifugal pumps of 1 to 7.5 hp, stainless-steel cabinets, and low-watt-density heaters.
In a conventional single-volute centrifugal pump, the hydraulic forces produced by the fluid in the pump volute act radially on the impeller's periphery.
Studies on the influence of various blade outlet angles in a centrifugal pump when handling viscous fluids, American Journal of Applied Sciences 4(9): 718-724.
The growth of low pressure centrifugal pump sales is surging at 15%, while the high pressure market is experiencing a more modest 5%.
Product entering the centrifugal pump is directed to the eye of the impeller and set in circular motion by the impeller vanes.
has a multistage centrifugal pump horizontally skid mounted for surface pumping applications.
In order for a centrifugal pump to run correctly, without wasting energy or sustaining internal damage, its design characteristics must be suitable for the intended service.
Alfa Laval's new SolidC UltraPure centrifugal pump has been developed to provide maximum cleanability and high levels of hygiene in a wide range of hygienic pumping duties in the beverage and food industries.