Training - Flowserve Apm Pump Cw Pump Part3
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Centrifugal Pump Basics Af fi ni ty Law s •System conditions may dictate that the pump operate at a speed other than the current operating speed of the pump. •A new performance may be obtained by changing speed or impeller diameter. •The affi nit laws ma be used to redi ct the erfo rmance at anot her Flowserve Corporation Property and Confidential speed or another impeller diameter. 63 Affinity Law s - Capac it y Chang es Ce ntr ifug al Pump Basics Due t o di amet er changes Due to speed changes Flowserve Corporation Property and Confidential 64 Where Q = capacity, n = speed, d = d iameter Rev-0 CIRCULATING WATER PUMP - O & M TRAINING 32 of 97
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Centrifugal Pump Basics
Affini ty Laws
•System conditions may dictate that the pump operate at a speed other
than the current operating speed of the pump.
•A new performance may be obtained by changing speed or impeller
diameter.
•The affinit laws ma be used to redict the erformance at another
Flowserve Corporation Property and Confidential
speed or another impeller diameter.
63
Affini ty Laws - Capacity Changes
Centrifugal Pump Basics
Due to diameter changes Due to speed changes
Flowserve Corporation Property and Confidential 64
Where Q = capacity, n = speed, d = d iameter
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Affini ty Laws - Head Changes
Centrifugal Pump Basics
Due to diameter changes Due to speed changes
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Where H = head , n = speed, d = diameter
Affini ty Laws - Power Changes
Centrifugal Pump Basics
Due to diameter changes Due to speed changes
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Where BHP = horsepower , n = speed, d = diameter
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Affini ty Laws
Centrifugal Pump Basics
Flowserve Corporation Property and Confidential 67
Exercise
Centrifugal Pump Basics
Bryce has a pump that he uses for beer production. He would like to
make more beer and found a larger impeller in the warehouse for his
pump that has a 10” diameter.What would the new flow, head, and HP be?
Current conditions:
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flow 1500 gpm
head 50 feet
motor 30 hp
impeller diameter 8.75”
68
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Brake Horsepower
Centrifugal Pump Basics
The input horsepower required at the pump shaft for a given capacity,
head, and specific gravity at the speed shown on the performance
curve
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Centrifugal Pump Basics
Brake Horsepower Exercise
Using the below graph, determine the BHP using the equation for the
following conditions.
•Head = 60 feet.
•Flow = 400 GPM.
•Efficiency = 70% (use 0.70)
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•Specific Gravity = 1
70
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