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Status : Active
Standard Type : Main
Document No : ISO/TR 11583:2012
Document Year : 2012
Pages : 26
Edition : 1
Section Volume : Pressure differential devices (ISO/TC 30/SC 2.)
Although the over-reading equations presented in ISO/TR 11583:2012 apply for a wide range of gases and liquids at appropriate gas-liquid density ratios, evaluating gas flow rates depends on information in addition to that required in single-phase flow: a measurement of the pressure loss can be sufficient; measurement of the liquid flow using tracers can be possible; the total mass flow rate may be known (this is more likely in a wet-steam flow than in a natural gas/liquid flow); in a wet-steam flow a throttling calorimeter can be used.
Wet-gas measurement using Venturi tubes or orifice plates is covered in ISO/TR 11583:2012.