On Fri, 26 Dec 2003 07:52:20 GMT, Gary Hallenbeck
wrote:


Gary

Sorry, but you are mistaken. Most compressors are rated in delivered
flow.

Several web sites make it clear that SCFM connotes weight of air
delivered. 1 CFM is defined as a cubic foot of air if it were at
standard condx -- of which there are several definitions.

An efficient two-stage pump's delivery in what they call ACFM varies
only slightly from 100 PSI to 175 PSI delivery pressure. Further,
the rated capacity at rated pressure is not much less than piston
displacement. See
http://www.abacamerican.com/Bel%20Aire%20electric.htm
for examples.

Some say CFM, others say ACFM, it's a mess!