[TheForge] Compressor ratings

[Phil Langefeld]

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.

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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