[TheForge] Compressor ratings

[Darrell]

> 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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