This thesis presents the development of a computer-aided simulation model for natural gas pipeline network system operations. The simulation model is a useful tool for simulating and analyzing the behavior of natural gas pipeline systems under different operating conditions. This model incorporates natural gas properties, energy balance, and mass balance that lay the foundation of knowledge for natural gas pipeline network systems. The user can use the simulation model to create a natural gas pipeline network system, selecting the components of natural gas, pipe diameters, and compressor capacities for different seasons. Since the natural gas consumption rate always varies with time, the dynamic simulation model was built to display state variables of the natural gas pipeline system and to provide guidance to users on how to operate the system properly.; The objects in the natural gas pipeline system such as compressor and pipe were represented in forms of images and text in the simulation model. Those images and text help users to understand what the natural gas pipeline system is and facilitate the interactions between users and the simulation model. (Abstract shortened by UMI.)
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