The one thing we must agree on is that the MASS flow rate thru a regulator
or compressor is conserved. (Assuming no leaks)

One cubic foot per minute of air at 14.7 psia (a for absolute) is equal to
some mass flow rate kg/minute, grams/second. I don't care what units.
So an SCFM is equivalent to a mass flow rate.
The convervation of mass principle says there will be the same mass flow
rate on the downstream side of the regulator. Hence Roy J's assertion that
SCFM is the same on either side of regulator.

Erich


"Grant Erwin" wrote in message
...
Roy J wrote:
SCFM is STANDARD cfm ie one cubic foot of air at 14.7 psi

Perhaps you meant to write, "one cubic foot of air @ 14.7 psi per minute"?

SCFM on either side of a regulator is the same.

That's interesting. How did you come to that conclusion? Applying that to
my hypothetical situation of an airflow of 10 cfm @ 180 psi regulated down
to 90 psi, that would yield about 13.7 cfm at 90 psi. I suppose we're
assuming
constant temperature throughout.

Grant Erwin
Kirkland, Washington