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NFPA 20 - impact on horsepower reduction as it relates to pressure and flow

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Cidona

Cidona

Mechanical
Oct 21, 2007
147
Dear Forum.

NFPA 20 2013 Section 11.2.2.3 thru 11.2.2.5 discusses and has equations for modifying engine horsepower for installations with temperatures and elevation. However, is there a way to know/calculate what impact that reduction of horsepower will have on pump flow/pressure?

Any insight would be appreciated!
 
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The affinity laws will give you the answer.

Affinity laws - Wikipedia

en.wikipedia.org en.wikipedia.org

Considering constant impeller diameter you can combine the equations to get flow and available head.
 
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