The
centrifugal pump works on the principle of centrifugal force.It
consists of a rotating element including impeller & a shaft and a
stationary element made up of a casing, stuffing box.Vanes
of impeller impart Kinetic energy to the fluid through centrifugal force.The
velocity is converted into pressure by means of volute or set of stationary
diffuser vanes surrounding impeller.
Multistage
centrifugal pump: A multistage pump is a pump with two or
more impellers.
There
are two ways of arranging impellers in multistage pump.
(a)
Impeller in series: For high head &
constant discharge.
(b)
Impeller in parallel: For high rate of
discharge & constant head.
The specific speed of
centrifugal pump is defined as the speed at which the pump would deliver one
cubic meter per second under a head of 1 meter.
Ns= NQ
1/2/H3/4
N = Speed
of the impeller or pump in r.p.m
Q = discharge of the pump in cubic meter
per second.
H= Head of the pump.
Radial Flow -below 4000
Mixed Flow - 4000 to
9000
Axial Flow- above 9000
—The centrifugal pump works on the
principle of centrifugal force.
—It consists of a rotating element
including impeller & a shaft and a stationary element made up of a casing,
stuffing box.