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Technical and economical calculations of pipelines networks of are made currently on the basis of stationary flow regimes that are to say of working regimes where the technical features (mainly flow speed and pressure) are supposed non variants with regard to the time. However the analysis of practical situations shows that the real flows are only unusually stationary. The hypothesis of stationary aspect in the conception of pipeline networks is bound mainly to the mathematical difficulties describing the nonstationary out-flow in a complex network of pipelines: differential equation systems of non linear partial derivatives of very big dimension. However the analysis of practical situation shows that the real out-flows are only unusually stationary. We suggest in this subject a modelling and simulation of a real pipeline with variable and transient regime and to study by means of numerical simulations the dynamic behavior of gas in pipeline by means of several scenario. The software used is the SIMONE of LIWACOM Group s.r.o and TGNET 5.6- E of SSI.

Transient Analysis of a Complex Network of Gas Pipeline Compulsory in the Design by Dynamic Simulation