Monitoring of water level in pump station forebay

Abstract

Data from the cascade of pumping stations showed rapid changes in water levels and consumption in the forebay. Experimental observations on the study of changes in the water level in the advance chambers of pumping stations were carried out at the Jizzakh pumping station. Mathematical-statistical and systematic analysis methods were used to determine the change in water level using a rail mounted on the front chamber of the pump station. According to the design, when 5 pumping units are operating at the main pumping station, the water level in the advance chamber should be 6.85 m. In the following months of 2020, it should be 3.95 m in March, 4.97 m in August, 3.60 m in September, 2.90 m in October. Based on the data, a graph was developed showing the change in water level during the year. It was found that the formation of water bubbles in front of the pump suction pipes was reversed in an average of 5.5 - 8 minutes due to changes in the water level in the forebay. In the presence of 2400V 25/40 type suction pipes when the water level drops below 3.4 m, in front of 1600V 10/40 type suction pipes when the water level drops below 2.8 m, water whirlpools were observed. In this case, developing and improving a special device in front of the suction pipes to prevent the pumping device from operating in the cavitation mode is an important direction.