pumps type
TRANSCRIPT
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External gear pump
Rotary pumps
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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