SimNet TSGas is a software package for simulating gas networks in transient states. It can simulate high-pressure gas network (transmission) of any configuration.

Depending on the selected mathematical model describing the transient gas flow, the packages for the dynamic simulation of gas networks are divided into two groups. The first relates to cases where the transient gas flow is described by a system of partial differential equations of hyperbolic type (for rapid changes in the operating parameters of the pipeline), the second group includes programs in which the gas flow is described by a system of partial differential equations of parabolic type (slower change of gas properties in the pipeline). Models of non-isothermal (hyperbolic type), in contrast, to the isothermal allow to include the gas temperature changes in the network.

**Computational properties**

The simulated network may have any number of sources with a predetermined value of pressure changes or capacity in a specified period of time, and any number of other non-pipe elements: compressor stations (compressors), pressure regulator stations (city gate stations) and valves. These elements may work with a given time evolution of the value of one of the following parameters: the inlet pressure, the outlet pressure, the compression ratio (reduction ratio), pressure drop (pressure increase), flow rate. In addition, the network may be equipped with any number of valves, operating in the open/ closed states.

The results of the simulation are: changes of gas pressure and temperature in the nodes as a function of the time and changes in flow rate, power loss, the average value of gas velocity in pipes, the missing values of the parameters describing the non-linear elements over time, a change of gas accumulation in the network as a function of time.

**Applications**

SimNet TSGas package enables the following tasks:

- detailed study of the behavior of the network under certain operating conditions of the system,
- determination of passages in which the network is overloaded (bottlenecks) and in which there is a spare capacity,
- planning the modernization and expansion of the network,
- issuing assurances of gas supply for future customers,
- checking the operability of the network during repairs of selected or excluded part due to failure of the network,
- assessment of the quality of work of telemetric system and measuring devices,
- determination of the necessary number of measuring devices and their location (measurements in other parts of the system can be replaced with the results of simulation calculations).

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