Explanation of which HYSYS property package is recommended for which types of fluids?  My search bogs down with a large number of sites showing how to select a property package (and not much explanation of which one to select).  I'm personally only familiar with Peng-Robinson & ASME Steam.
My simulation has following components:  Water, N2, CO2, CO, H2, H2S, O2, ethanol, minor organic solids.Process simulators are quite complex tools to initialize and run, if you are not familiar with those models or the operating of your software I would suggest to consult a process engineer, read a good book or the operating manual where there is a good explanation...
For these reasons and simple problems (as those related to a design/rating of a gate valve) I prefer simple tools as Prode Properties which includes all the models you mentioned and are very easy and immediate to use.In order to select property package you will benefit from a background in chemical engineering. Not to say that you cant get the knowledge otherwise - but there is a risk when using computer software as "black boxes" - your chances of spotting obvious and less obvious erroneous results becomes lower.

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