Use correct conversions for sonic flow in safety-relief valves
Volumetric flow rates of different gases often are compared to equivalent volumes of air at standard atmospheric temperature and pressure. The ideal gas law works well when used to size fans or compressors. Unfortunately, the gas law relationship, PV/T = constant, is frequently applied to choked gas streams flowing at sonic velocity. A typical misapplication is the conversion to standard cubic feet per minute in the sizing of safety-relief valves. The author develops sonic gas-capacity conversions. Development starts with an isentropic sonic-flow equation and leads up to mass flow rates and volumetric flow rates of gases at operating conditions, and volumetric flow rates related to standard atmospheric pressure and temperature.
- OSTI ID:
- 260738
- Journal Information:
- Chemical Engineering Progress, Vol. 92, Issue 6; Other Information: PBD: Jun 1996
- Country of Publication:
- United States
- Language:
- English
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