[TheForge] Compressor ratings

Mon Aug 12 15:20:04 2002

Yup and I obviously forgot about 240v.  Thanks.

Phil

At 10:00 AM 8/12/2002 -0700, you wrote:

> > Horsepower ratings are meaningless, but you can get some insight into the
> > manufacturer's ethics in labelling by comparing the rated amps to the rated
> > horsepower.
> >
> > Multiply the rated amps by 120 and divide by 746 to get the theoretical
> > horsepower.
>
>This should read:
>
>Multiply the rated amps by the rated voltage and divide by 746 to get the
>theoretical
>horsepower.
>
>This works for single phase. Three phase motors produce about 20 percent more
>than the above calculation.
>
>Darrell
>
>http://www.machinemaster.com
>
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>
> > Here's what I've found.  Major "quality" manufacturers like Ingersol-Rand
> > work out very close.  Cheapo manufacturers like Campbell-Hausfeld typically
> > have volt-amp numbers that are close to 5hp on motors that they label as
> > 7hp.  Sears equipment has similar false ratings.  Also note that the CH
> > compressors are usually diecast potmetal and the motor hp ratings have "SP"
> > after them.  The SP appears to indicate that the hp rating is less than 
> real.
> >
> > Phil
> > Austin, TX
> >
> >
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