Annual air loss is computed by scaling the instantaneous leak flow rate by the annual system operating time, converting from standard cubic feet to kiloscf. The factor of 60 converts operating hours to minutes so the units are consistent with the flow rate in scfm. The factor of 1000 converts standard cubic feet to kiloscf, a more practical unit for annual volumes.

\begin{equation}\label{eq:bag-method-annual-consumption} C_{annual} = \frac{Q_{leak} \cdot t_{op} \cdot 60}{1000} \end{equation}

Symbols

\(C_{annual}\)	Estimated annual air loss from the leak \([\unit{ \kscf}]\)
\(Q_{leak}\)	Compressed air leak flow rate \([\unit{ \scfm}]\)
\(t_{op}\)	Annual system operating time \([\unit{ \hour}]\)
\(60\)	Minutes per hour conversion \([\unit{ \minute\per\hour}]\)
\(1000\)	Standard cubic feet per kiloscf conversion \([\unit{ \unitless}]\)

Note

The result is in kiloscf (kscf), where 1 kscf = 1000 standard cubic feet. This unit is conventional for annual compressed air volumes in industrial energy assessments.