Abstract
In Uzbekistan, as well as in many other countries of the world, pumping units operate in parallel into a common pressure pipeline at some pumping stations of the irrigation system. This was done mainly to save on the capital costs of the pipeline. Analysis and hydraulic calculation of the existing large irrigation pumping stations with pumping units operating in parallel showed that at some of them the conditions of parallel operation of pumping units were impaired. As a result, a negative hydraulic process arises, in the form of self-induced vibrations of the water flow in the pipeline, which leads to various damage and deformation of the pressure pipeline and pipeline supports. The calculations showed that with different modes of pumping units operating together, the power consumption at the Amu-Bukhara-1 and Namangan pumping stations, accounting for one unit increases by 0.72 ... 6.53%, and at the Amu-Bukhara-2 and Amu-Zang-2 pumping stations, this index, on the contrary, decreases by 0.32 ... 1.67%. Therefore, a properly selected operating mode of parallel-connected pumping units will lead to a decrease in operating costs, i.e. decrease in the prime cost of raised water.
Highlights
IntroductionA large number of pumping stations operate in the irrigation systems of Uzbekistan and other countries of the world. 1668 pumping stations operate under the Ministry of Water Management of the Republic of Uzbekistan, which include more than 5000 pumping units
In Uzbekistan, as well as in many other countries of the world, pumping units operate in parallel into a common pressure pipeline at some pumping stations of the irrigation system
A properly selected operating mode of parallel-connected pumping units will lead to a decrease in operating costs, i.e. decrease in the prime cost of raised water
Summary
A large number of pumping stations operate in the irrigation systems of Uzbekistan and other countries of the world. 1668 pumping stations operate under the Ministry of Water Management of the Republic of Uzbekistan, which include more than 5000 pumping units. - equality of the length of the connecting pipelines, since the pumping units are chequered and in order to achieve their equality, various hydraulic resistances are installed. The conditions of parallel operation of pumping units gets impaired, a negative hydraulic process occurs, in the form of self-induced vibration of water flow in the pipeline [1, 5, 10]. This leads to various damages and deformations of the pressure pipeline and its supports. Differs from the instability of pumping units due to inconsistency of the characteristics of the pump and pipeline [1, 5, 10,11,12,13,14,15,16,17,18,19,20]
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