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Abstract
Natural gas is the most growing energy source. Natural gas transportation from fields to consuming areas is most challenging step that faces natural gas industry. Natural gas transportation by pipelines represented about 70% of transported natural gas in the world. Transportation simulation by mathematical models becomes necessary to estimate gas temperature and pressure in pipeline. There are many thermal models for simulation which varied in its complexity and accuracy. In this study, simulation for Egyptian western desert gas pipeline by different thermal models is conducted and a comparison between these models and its accuracy is also done. The influence of the following parameters soil temperature, gas mass flow rate, gas feed temperature and Joule Thompson coefficient were investigated to determine its effect on variation of pressure and temperature along pipeline, and the compression station power. The results show that isothermal model is the least accuracy model and results in errors for compression station calculation because of false pressure and temperature estimation at compression station for this model. In non - isothermal model at which temperature varies along the pipeline due to heat transfer from gas to surrounding soil and also due to Joule Thompson effect, a system of two 1st order differential equations is solved simultaneously by two methods: analytical method and numerical method using matlab code. The results showed that numerical solution is most accuracy model and its simulation for temperature and pressure is very near to actual data