Dynamic modelling of transients in high-pressure natural gas pipelines
Abstract
Natural gas is mainly transported undersea in large-scale and long distance pipelines. Prediction of the gas pipeline temperature and pressure profiles is very important in the operation of natural gas transport, especially in case of accidents of pipeline upstream or downstream. An analytical method for calculation of these profiles has been developed and this method of implicit high order finite difference scheme could be a good choice to build the software for simulation of dynamic gas pipeline. In this work, an implicit finite difference scheme has been used to solve the energy equation, the continuity and momentum equation. The flow model was validated by comparing the computed results to commercial software for an off shore natural gas pipeline, with defined natural gas composition. The modelled results showed good agreement with the commercial software (with an average absolute deviation of 0.41% on pressure, 0.39% on flow and 0.29% on temperature).
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