"Decker, Michael" wrote:

I've just begun testing of a new type rotary pump and I'd like to

get

input

if possible from the group on methods.

I can easily measure intake vacuum level, which should give me an

idea

of

volumetric efficiency.  Would it be valid to use the difference in

amp

draw

on my electric motor drive to determine what my HP usage is?

Thanks in advance for any comments.

Mike

Yes but you need to know the efficiency for the motor. Most motors are

around 80%

Paul Lamar

Actually, NO if you are using alternating current motor. you need to

measure

power factor.

Yes if using a D.C. motor, but then you need to know the efficiency as

paul

states.
Bill Schertz

It was not that long ago that we were going through tis with the water pump.
If you have an AC motor you will get a good approximation if you have
access to a true watt meter it will take care of the pwer factor, and in any
case for good data you need to calibrate the motor on a dyno.
Vance>

 
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