ABSTRACT

Fluid properties are a critical element to the success of any pipeline simulation. In some cases the pumped fluid or liquid mixture is so exotic in nature that laboratory data is unavailable and an educated guess is the only course of action. For transient simulation, knowledge of the isothermal compressibility is important and some estimate could be made by realizing the composition of the mixture. For steady state simulation, possibly for a batched system, the flow rates would need to be corrected to standard or pipeline base conditions, and these correction factors require knowledge of both the isothermal compressibility and the thermal expansion properties. If one can estimate the fluid compressibility with some certainty, can one also estimate the isobaric expansivity? Laboratory test data tend to show that liquids with high compressibility also seem to have high isobaric expansivity, indicating a correlation between the two. Hence this paper intends to discover what, if any, correlation exists through examination of fluid properties of known pure components, and application of physical processes and required thermodynamic stability.

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