The heat loss is calculated by multiplying the specific heat at average temperature, the leakage flow rate at standard conditions, and the temperature difference between leaking gas and ambient.

\begin{equation}\label{eq:leakage-heat-loss} Q = c_{psv} \cdot \text{SCFH} \cdot (T_{\text{leak}} - T_{\text{amb}})\end{equation}

Symbols

\(Q\)	Heat loss \([\unit{ \btu\per\hour}]\)
\(c_{psv}\)	Specific heat of gas at average temperature \([\unit{ \btu\per\cubicFoot\degreeFahrenheit}]\)
\(\text{SCFH}\)	Standard cubic feet per hour of leakage \([\unit{ \cubicFoot\per\hour}]\)
\(T_{\text{leak}}\)	Temperature of leaking gases \([\unit{ \degreeFahrenheit}]\)
\(T_{\text{amb}}\)	Ambient temperature \([\unit{ \degreeFahrenheit}]\)