The article discusses the methods of maintenance and technical diagnostics of large vertical pumping units of modernized pumping stations of the largest cascades of the Amu-Bukhara and Karshi channels to ensure reliability during their operation, assesses the qualitative and quantitative changes in their modes. The operation of large pumping stations poses a number of problems that cannot be solved without experimental studies. The aim of the research is the problem of comprehensive diagnostics of pumping units and the development of new export-oriented diagnostic devices. The use of new designs of pumping power and diagnostic equipment involves the use of mathematical modeling of control of the operating modes of machine channels, which gives significant savings. Methods of accounting for cavitation – hydroabrasive wear of the blades are based on the study of the movement of the hydroabrasive flow along the radius of the impeller. Recommended elimination of pump operating modes with a maximum wear rate of their parts.

The article substantiates the need to develop energy-saving modes of large irrigation pumping stations and pumping units. The Object studies are centrifugal pumps residing in usages on the pumping station of the Republic. In the process of performing, the studies were used main positions theoretical mechanical engineers, hydraulics, theories blade pump, processing result field and laboratory experiment, graphic and analytical methods. The Purpose thesis work is increasing to efficiency to usages centrifugal pump irrigation systems by development scientifically-motivated ways of the discovery rational state of working and complex action on increasing of the working factors them, on the base of the use theoretical bases motivations factor, influencing upon the intensity of wear-out details pump and improvements of the hydraulic processes in running part pump unit. The new features of the pump is designed on the base of the methods calculation corner of the entry and output of working water travel about changed designs of the pump. The substantiation of technological, environmental factors is given. Considering that are pumping units are energy-consuming objects, recommendations are given on upgrading the flow part of the pumps.