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| Centrifugal Pumps |
The
simplest type of centrifugal pump is the single stage machine
that consists fundamentally of a rotating element, called
an impeller, and a casing. Liquid is led to the eye or
center of the impeller and is set into rotation by
the impeller vanes. By virtue of centrifugal force the
liquid is thrown from the rim or periphery of the impeller
with a considerable velocity and pressure. The casing,
which closely surrounds the impeller, has a volute shaped
passage of increasing area, which collects the liquid leaving
the impeller, and converts a portion of its velocity energy
into additional pressure energy. This casing passage leads
to the discharge nozzle of the pump where it is forced
into the discharge piping.
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