I am looking to calculate density as function of pressure according to NFPA-12 document for high pressure CO2 systems where the initial storage pressure is 750 psi (5171 kPa). I require this to calculate and plot Y and Z factors as explained in Annex C of the document attached. I am looking to match values given in "Table C.I(b) Values of Y and Z for 750 psi Initial Storage Pressure".

I am assuming the pressure is decreasing with enthalpy held constant as mentioned by the NFPA-12 document. But I am not able to match values of Y and Z.

Any help or hints will be appreciated.

Thank you very much!

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