Deep Vacuum below 10 mbar - Physical props limits / application limits

[jamesbanda]

All,

I'm validating a unit design on a process for changed operating conditions. The Aspen EDR Program issues warnings that below 10 mbar is below the expected operating condition for a unit.

Are their any particular conserns that one should be aware of with simulation of deep vacuum systems..

theortically speaking is as the molecules are far apart the system should behave ideally and no issues would be posed with an idea methord or equation of state..(right?)..