Pump Size vs Pressure Washer Motor HP

C

clarkservices

New member
Is there a math equation to figure the biggest pump per gallon vs the pressure washer motor HP?

If I have a 18hp Vanguard what would be the largest gpm pump, to use safely, to marry the units together.


Thanks
 
Does anyone use a 8gpm 3,000 psi set up and if so, could you compare it to a 5.6gpm @ 3,500 psi.

We just purchased a flat bed truck with a brand new 18 hp Vanguard but the pump is shot. Will use it 100% for commercial flatw
 
Actually, to find desired horsepower, I prefer ( [gpm X psi] / 1450) X 1.5
So let's use 5.5 gpm and 3,500 psi for an example...
( [5.5 X 3,500] / 1450) X 1.5
( 19,250 /1450 ) X 1.5
13.28 X 1.5 = 19.91 hp.
Many use the formula (gpm X psi) / 1100. This formula will work, but pushes the engine to it's limits constantly. A slightly larger engine will last longer.

With 18 hp and 8 gpm, I wouldn't run over 2,200 psi, 2,500 psi max.
 
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