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ACFM to SCFM Conversion
Lohm Laws – Working with Gases

ACFM to SCFM Conversion

It is frequently convenient to express gas flow in terms of flow at standard conditions. This is useful for calculation purposes or for the application of flow measuring instruments.

However, since most applications are not occurring under standard conditions, it may be necessary to convert the actual conditions to standard. The following formula can be used to convert the actual flow rate to the standard flow rate in cubic feet per minute. The flow rate in other units can be determined by converting them into cubic feet per minute before and after using the formula.

\[\text{SCFM}=\text{ACFM}\ \left(\frac{\text{P}}{14.7}\right)\ \left(\frac{519}{460+\text{T}}\right)\]

Where:

T = Gas temperature (°F)
P = Gas pressure (psia)
ACFM = Gas flow (actual cubic feet/minute)
SCFM = Gas flow (standard cubic feet/minute)

EXAMPLE:

What is SCFM corresponding to 0.032 ACFM at 300 psia and at 240°F?

SOLUTION:

\[\text{SCFM}=0.032\ \left(\frac{300}{14.7}\right)\ \left(\frac{519}{700\ }\right)=0.48\]
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