There is made a mathematical modeling of unsteady hydrodynamic processes in pipelines using the software package OLGA7. There are made the laws of pressure change in the main oil pipeline during transitional processes caused by cessations of pumping units. There are offered analytical dependences for the damping coefficient of the pressure wave in the pipeline for the cases of cessation of one, two and three sequentially operating pumps in a pumping station. Comparison of simulation results of pressure on the proposed formulas with the data of industrial experiments indicates the reliability of dependencies and their possible use for predicting the parameters of transients in oil pipelines.
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