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Pressure drop thru pipes and fittings of compressible fluid

Pressure drop thru pipes and fittings of compressible fluid

Pressure drop thru pipes and fittings of compressible fluid

(OP)
I'm using equations 3.20 in Crane to calculate the pressure drop of a compressible fluid at a give rate through pipes and fittings using values of the net expansion factor given in page A-22. However, most of my calculations involves propylene which has a somewhat lower Cp/Cv (= 1.15 roughly) than the lowest value of page A-22, that is Cp/Cv = 1.3.
Is there a way to obtain similar data for other Cp/Cv values? I've done a small amount of research on this subject and i still didn't find any clue, only data for Cp/Cv = 1.3 or 1.4!  Else, do you think the difference of using a value of 1.3 instead of 1.15 or closer could be important?
Thank you!

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