natural gas unit scm?

Answer 1

"A standard cubic foot (abbreviated as scf) is a measure of quantity of gas, equal to a cubic foot of volume at 60 degrees Fahrenheit and either 14.696 pounds per square inch (1 atm) or 14.73 PSI (30 inHg) of pressure. "
Please read below:

ACFM = SCFM X 14.7 /14.7 + psig X 460 + °F/530

To demonstrate, plug in the following values and work the math:
SCFM = 1000
psig = 100
°F = 70
ACFM = 1000 X .128 X 1
ACFM = 128
Assuming this is nominal flow in a pipeline, the Sponsler website tools can be used to determine that the appropriate meter size for 128 ACFM is a 2" meter that will give a linear measurement over a 15 – 250 ACFM flow range.
A good way to visualize this is remember that a single ACFM can contain multiple SCFM, depending on the effects of pressure and temperature.

Answer 2

Standard Cubic Feet per minute (Standard meaning at standard temperature and pressure, which is commonly 1 atmosphere and 60°F).