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