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External gear pump

Rotary pumps

http://localhost/var/www/apps/conversion/tmp/scratch_15/external_gear_pumps/external_gear_pumps.htm

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TRIPLE SCREW

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Main features of rotary pumps

Positive displacement

Self priming

Fairly constant discharge

Less vibration

Weight per unit flow is less compared to recip type

Less no. of parts, making it less complicated

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PLUNGER-DIAPHRAGM METERING PUMP

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SPECIFIC SPEED VARIATIONS OF DIFFERENT TYPE OF PUMPS

D1

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Casing types

Impeller types

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DOUBLE VOLUTE ADVANTAGES

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CONSTRUCTIONAL FEATURES OF PUMP

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BACKPULL OUT DESIGN OF CENTRIFUGAL PUMP

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MULTI-STAGE CENTRIFUGAL PUMP

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MULTI-STAGE CARTRIDGE TYPE PUMP

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MULTI-STAGE CENTRIFUGAL PUMP

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NET POSITIVE SUCTION HEAD - NPSH

THE AMOUNT OF ENERGY IN THE LIQUID AT THEPUMP CENTRE LINE

NPSH AVAILABLE SYSTEM CHARACTERISTIC

PUSH FLUID TO PUMP

PRESSURE OVER THE FLUID

STATIC HEAD OF FLUID ABOVE PUMP

CENTRELINE

ATMOSPHERIC PRESSURE

VELOCITY HEAD

PUSH FLUID BACK

FRICTION LOSS IN PIPINGSYSTEM

VAPOUR PRESSURE OF

LIQUID

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NPSH REQUIRED

PUMP CHARACTERISTIC

NET POSITIVE SUCTION HEAD - NPSH

VARIES WITH PUMP DESIGN, SIZE

ENERGY REQUIRED TO OVERCOME FRICTIONAL

LOSSES FROM PUMP SUCTION TO IMPELLER VANES

DETERMINED BY NPSH TEST

NPSH A EQUAL TO OR GREATER THAN NPSH R

VARIES WITH OPERATING FLOW

STRAINER BLOCKING

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PRESSURE DROP IN PUMP

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P f f if l

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Performance curve of centrifugal pump

Operating point

Capacity

BHP

Efficiency

BHP

Effic

iency

Tota

lHead

Pump curve

System curve

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EFFECT OF RPM IN PUMP

COST DECREASE WITH SPEED

NPSH R INCREASES WITH SPEED

ABRASION & WEAR INCREASE WITH SPEED