Jeff Spitzer wrote:

In many cases of water pump power you will find that it's hard to make the
numbers add up.  I'll tell you why.  Most of the horsepower goes into the
bearings and seals.  If you do the math you find that 35-40 GPM at 15 psi
or whatever you think the loop drop is amounts to only fractional
horsepower.

cmsmith wrote:

Assuming 40 GPM, 15psi or 30 ft head and specific gravity of 1 then
Water HP = (40 x 30 x 1) /3300 = 0.364.  All the rest is known as pump
inefficiency and includes frictions, belt drive etc.

 
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