MEASUR-Tools-Suite v1.0.11
The MEASUR Tools Suite is a collection of industrial efficiency calculations written in C++ and with bindings for compilation to WebAssembly.
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The pressure adjustment converts actual volumetric flow at operating pressure (gauge) to standard atmospheric pressure. Gas volume is proportional to the square root of absolute pressure.

\begin{equation}\label{eq:flow-calculations-abs-gas-pressure} P_{gas,abs} = P_{gas,gauge} + P_{atm}\end{equation}

\begin{equation}\label{eq:flow-calculations-pressure-adj} f_P = \sqrt{\frac{P_{gas,abs}}{P_{atm}}}\end{equation}

Symbols
\(f_P\)Pressure adjustment factor \([\unit{ \unitless}]\)
\(P_{gas,abs}\)Absolute gas pressure \([\unit{ psia}]\)
\(P_{gas,gauge}\)Gauge gas pressure \([\unit{ psig}]\)
\(P_{atm}\)Atmospheric pressure (14.7) - see physics::us::kAtmosphericPressurePsi \([\unit{ psia}]\)