Hi everyone,

I'm trying to simulate a "Crude Distillation Unit" using HYSYS in dynamic mode. In the Static mode, everything is fine and the simulation is converged.

I added equipment data and also the controllers to the static file. I checked all hints of the "Dynamics Assistant" and everything is fine. In addition, in the "Equation Summary" window HYSYS reports that "Specifications OK".

However, when I switch to "Dynamic Mode" and I active the Integrator, the following message appears: "The pressure flow solver is unable to solve the matrix".

Could anyone help me to identify and solve the possible problem?