An independent and accurate estimation of the speed of sound can provide an important quality check for a multitude of single and multi-phase ﬂow applications. More recently, proposed screening methods for the calculation of PRV stability require an accurate estimate of the speed of sound for the ﬂuid/piping system. This paper outlines proper methods for the calculation of thermodynamic properties and speed of sound for single and multi-phase systems. Comparisons with actual measurements indicate that credible values can be obtained for single and multi-phase systems.
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