Chempak is an add-on program (by AFT) that provides fluid properties for a long list of chemicals to be used in other AFT programs. It does not perform hydraulic calculations.
Chempak is great for determining the fluid properties of mixtures (particularly hydrocarbons). It is a bought in product and covers some 700 fluids.
It is a source of information that is used in AFT's other products such as Fathom (steady state) and Impulse (transient analysis). It can also be a standalone product if you run other hydraulic analysis software.
I have used it for over 10 years.
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