Calculation of water hammer on the pressure pipeline of modernized irrigation pumping station

One of the main factors to provide reliable and safe operation of irrigation pump station – prevent possible occurrence of water hammer. In order to determine the magnitude of water hammer's method of characteristics (moc), wave characteristic method (wcm), graphical analytical and simplified methods of calculations are used. During the design for the construction of the new pump station surge analysis should be carried out using accurate calculation methods moc or wcm using special computer software. At the same time, should the modernization of existing pump station is taking place with the installation of the same equipment, then simplified calculations method can be used. But care must be taken to take in to account all the factors that might increase the risk of occurrence and with the higher magnitude of water hammer: reduced inertia of pumping set's moving parts, replacement of shutting valves to different types, replacement of air valves to different types, reduction of hydraulic losses after discharge pipeline repair works and etc. Existing simplified calculation methods to calculate water transients in pump stations was modified to take in to account these factors. Based on the proposed method surge analysis calculations had been carried out at modernized pump station "Kizil-tepa". Comparison of calculation results performed by simplified method and wcm using «KY-Pipe 2018-Surge program-version 9.014» has shown a good similarity in the magnitude of maximal positive pressures.

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