For gas, water, and district heating utilities, PSIcontrol also provides extensive network calculation functions which are integrated in the control system. Depending on the task, steady-state, quasi-steady, and non-steady network calculations are required:

- For
**steady-state network calculations**, the time dependency of the network state is not considered. Steady-state network calculations are typically used for calculating water networks and low pressure gas networks.

- For
**quasi-steady network calculations**, a sequence of steady-state calculations is performed. Within the calculation period, the switching states and infeed/outflow volumes can be modified. On the basis of these sectional and time-independent hydraulic network states, the transport processes such as quality and temperature tracking as well as water age can be calculated. Quasi-steady network calculations are used especially for calculation of district heating networks as well as of water networks and low pressure gas networks.

- For
**non-steady network calculations**, the actual flow state is modeled in dependence on time. This allows consideration of network fluctionations and pressure surges. Quality tracking is also possible for non-steady network calculation. Non-steady calculations are used for the calculation of high pressure gas networks and pipelines. For non-steady network calculations, we are using the calculation model PSIganesi of our sister business unit PSI gasgrids and pipelines.

PSIcontrol provides the following scope of functions for pipe network calculations:

- State estimator and state observer,
- Cyclical forecast simulation,
- Forecast simulation,
- Steady-state simulation,
- Planning simulation.