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Unit 4Pumps

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Introduction to pumps

Pump is a hydraulic machine, driven by a motorIt converts the mechanical energy into hydraulic

To lift water to higher levels

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Positive Displacement Pump:

The liquid is sucked and then pushed due to the thron it, by a moving member This results in lifting thethe required height

Rotodynamic Pump:

It has a rotating element, called Impeller !s the liquthrough the impeller , its angular momentum changresults in an increase in the pressure energy of the

Positive Displacement Type Rotodynamic Type

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"entrifugal Pump It is #ydraulic machine with a rotating part called

#ere mechanical energy is converted into pressure

by means of centrifugal force acting on the liquid

Types

!ccording to the type of casing

$olute casing , vortex casing, %i&user casing

!ccording to the no of stages

'ingle stage, (ulti stage

!ccording to the types of impeller

'ingle suction and double suction

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From the Centerof a Circle

RADIAL DIRECTIONTo the Outside of a Circle

! machine for moving )uid byaccelerating the )uid RADIALLYoutward

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Diameterofthe Impeller

Thicknessof the impell

"entrifugal Impellers

Thicker the Impeller* (ore +ater

arger the %I!(-T-. * (ore Pressure

ImpellerVanes

Eye oftheImpeller

WaterEntrance

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Two Impellers in 'eries

Direction of Flow

Twice the pressure

'ame amount of water

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"entrifugal Pump

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.eciprocating Pumps It converts the mechanical energy into pressure ensucking the liquid into a cylinder, in which a piston

reciprocating

Types /

!ccording to the contact of liquid one side or both

the piston 'ingle !cting .eciprocating Pump

%ouble !cting .eciprocating Pump

!ccording to the 0umber of "ylinders

'ingle cylinder .eciprocating Pump

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'ingle !cting .eciprocating Pu

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%ouble !cting .eciprocating Pin contact with both the sides of the piston, it is known as %oubg reciprocating pump has two suction and two delivery pipes