The best and most economical way of transportation of natural gas in immense scale and for a long time is pipeline. In this paper a small portion of the natural gas transmission networks in Iran has been analyzed, Part of the main export pipeline with some branch to Local consumers. From the perspective of a manager or engineer of Gas industry, Gas distribution network is a set of parameters; the most important parameter is pressure at any point of gas network. Engineering Software estimates the pressures based on the pressure equation; these equations have always some errors, sometimes the error is a too much as far as could be cause serious problems in gas distribution. In general gas equation is Connection between flow pressure pipelines; based on temperature, roughness, compressibility factor, density gas pipeline specifications and environmental changes. In this research we have tried to adapt the amount of pressure based on Roughness values changes. Recently, several statistical techniques are used to solve such problems, in this study, the genetic algorithm is used. Along with error correction it has time saving compared to the analytical methods. Tuning process in this network System error can be reduced by up to 8 times in first step and it can be insignificant if the strong computer Processor or sufficient time be available.

Gas transmission Pipeline Optimization Pressure equation NG behavior simulation Statistical calculations Tuning