The bag sub-calculator returns an annual consumption in kscf that already accounts for the operating time and number of units specified in the bag method input. The survey applies its own units multiplier to this result without the 1000× conversion to standard cubic feet. The reported annual_total_flow_rate therefore carries units of kscf for bag-method entries, while estimate, decibels, and orifice entries contribute in scf.

\begin{equation}\label{eq:leak-survey-bag-annual} V_{annual} = C_{bag} \cdot n \end{equation}

Symbols

\(V_{annual}\)	Annual compressed air volume for this survey entry \([\unit{ \kscf}]\)
\(C_{bag}\)	Annual consumption from bag_method::calculate \([\unit{ \kscf}]\)
\(n\)	Number of identical leak points (units multiplier) \([\unit{ \unitless}]\)

Note: The bag_method::Input.operating_time field governs the period over which annual consumption is computed for bag-method entries; it is not overridden by the survey's hours_per_year field (unlike the estimate method).