discusses the mathematical development of affinity laws. But there is no better

proof for affinity laws than the consistent pump test results conducted under

carefully controlled and monitored test laboratories confirming their validity.

impeller diameter, or speed, is there another practical use for affinity laws?

design a new size pump from scratch. But they should be applied only to pumps

of similar design. Example, using affinity laws to model, or size factor, a single

suction pump to design a new double suction pump will have inaccurate result -

they should be both of the same type.

change in impeller diameter. How are the affinity laws used to estimate the new

impeller diameter if I want to reduce the head only, say by 10%, if the capacity and

speed are to remain the same?

gearbox. During the summer months we want to increase its flow rate 10%, from

1000 GPM to 1100 GPM. Based on Affinity Laws we can increase the engine

speed 10%, from 800 RPM to 880 RPM, to get the 10% increase in flow rate. But

this will also increase the head 21%.

The pump is used for irrigation so we only want to increase its flow rate, and not

its head. Assuming the head is 30 feet, at what speed should we run the engine?

[ * ] Some information are excluded in this article. Read more.

R: 0110-USAN

C: basics, operation

F: affinity uses

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