Use multiple process models within a single process unit

A single process unit may be associated with several process models. Typically each process model is tuned to handle a different type of feed to the unit (see Process units and process models).

When using different models in a process unit, each model must be separately mapped, that is, the model inputs and outputs must be connected to the unit inputs and outputs. Use the stream associations of the unit to map the model and unit pipes.

Example: A naphtha hydrotreater is a process unit. This may contain different process models: one which simulates the processing of light naphtha, another which simulates the processing of heavy naphtha and a third one which simulates the processing of wild naphtha. Although in the actual physical plant there is only one process unit and one feed to this unit, it may be more accurate to use three different models for the different feed types to simulate the model performance.
If the wild naphtha hydrotreater model outputs DS LNAP and DS HNAP, these should be connected to the naphtha hydrotreater Light Naphtha and Heavy Naphtha output pipes.