CHANGE IN LEVEL WATER IN PUMPING-PLANT INTAKE

A decrease in the water level in the pump chamber of the pumping stations leads to the formation of whirlpools in front of the suction pipes. As a result of air intake, the pump unit operates in cavitation mode and their intensive wear occurs. As the data obtained from the Karshi machine channel show, mainly a decrease in design water levels in the downstream waters is observed at the first pumping station. Depending on the number of simultaneously operating pumping units, the minimum water level in the head pumping station should be from 4.5 m to 5.7 m. The received data from pumping stations for 2019 showed that, in March, July, August, September, October, levels the water in the downstream chambers was lower and reached 1.1 m. As a result of this, funnel formation was detected. Data was obtained that a decrease in water levels and the formation of funnels in the chamber reduces the pump flow rate to 16–44% and the efficiency is reduced to 9–28%. Conducted research in this direction to prevent funnels in the chambers and the penetration of air into the suction pipelines are relevant.

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