UDC 614.81
This article presents the results of a comprehensive study to determine the maximum operational parameters of a centrifugal fire pump operating in cascade mode with sequential pumping of water according to the "pump to pump" scheme. The study is aimed at establishing boundary conditions that ensure trouble-free operation of pumping equipment. The methodological basis of the work was the analytical calculation of the pressure developed by the pump for a wide range of operational scenarios. During the analysis, various configurations of hose lines (variable length) and operating modes, differing in the amount of water supply, were considered. Based on the calculation results, functional dependencies between the key parameters of the system have been established and quantified: the length of the deployed hose line, the volume flow of water and the required pressure at the pump outlet. It was found that the most dangerous mode from the point of view of mechanical overload and the risk of failure of the pumping unit does not occur at the maximum length of the main line, but, on the contrary, when using short sleeve lines with a length of 1-3 sleeves in combination with a high water supply in the range of 27-32 liters/s. In this configuration, the design pressure value reaches critical values of the order of 80-90 m of water, which may exceed the rated characteristics of the intake pump and lead to cavitation, increased vibrations, and overload of the shaft and motor
nasosno-rukavnaya sistema, napornye pozharnye rukava, napor, davlenie, gidravlicheskoe soprotivlenie, granichnye parametry, pozharnyy nasos, perekachka vody
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