Abstract:

On the basis of the generalized equation of unsteady flow(transient flow) in complex natural-gas pipelines，combined with the real conditions, this paper presents the mathematical models of gas transient flow in single loop pipeline networks and two-loop in parallel pipeline networks，and then applies the method of Laplace Transform, and after making a series of mathematical calculations, derives the formulas describing the laws of gas transient flow in gas loop pipeline networks, In order to make it possible to apply the formulas to production practice, computer programs are by compiled. Finally，real examples and their calculation results are given，which the pressure curves depending on pipe-length and time are drawn.

Key words: Fluid flow equation, Unsteady flow, Gas pipeline network