The decibels sub-calculator returns an instantaneous leak rate. The annual volume is computed from that rate, the annual operating time, and the minutes-per-hour conversion factor.

\begin{equation}\label{eq:leak-survey-decibels-annual} V_{annual} = t_{op} \cdot Q_{total} \cdot 60 \end{equation}

Symbols

\(V_{annual}\)	Annual compressed air volume lost through this survey entry \([\unit{ \scf}]\)
\(t_{op}\)	Annual compressed air system operating time \([\unit{ \hour\per\year}]\)
\(Q_{total}\)	Combined instantaneous flow rate for this entry \([\unit{ \scfm}]\)
\(60\)	Minutes per hour conversion \([\unit{ \minute\per\hour}]\)