THE METHOD OF CALCULATING PRESSURE AND FLOW CHARACTERISTICS OF A FIRE PUMP
Purpose. The article provides a historical outlook on the development of pumping installations. A nomenclature series of coefficients for determining pressure and flow characteristics of pumps is presented. The study is due to the lack of data for calculating the coordination of operating modes of modern samples of centrifugal fire pumps and engines driving them. Methods. The authors used the least squares method and the theoretical regression equation. Findings. The test installation, according to the principle diagram, allowed determining pressure and flow characteristics of the combined centrifugal fire pump NH30 Rosenbauer.To determine the dependence of pressure on the water flow, the method of least squares was implied. The unknown parameters were determined from a system of linear algebraic equations. The theoretical regression equation was applied as the second calculation method, the unknown parameters were determined using the system of Gaussian normal equations.Both methods of calculating the coefficients for determining pressure and flow dependence of the NH30 Rosenbauer pump led to 99% coincidence of the results of the subsequent calculations with the experimental data. This fact indicates the possibility of using both methods for calculating pressure and flow characteristics of centrifugal fire pumps. However, to simplify engineering surveys when designing technical fire extinguishing equipment with a centrifugal fire pump, it is reasonable to make calculations using the system of Gaussian normal equations.Research application field. The obtained results are applicable for calculating the operation coordination of modern fire pumps and engines while designing fire trucks of different types. Conclusions. The study prospect is calculating dimensionless coefficients of pressure and flow characteristics for the entire range of modern centrifugal fire pumps.