Analysis of characteristics of centrifugal marine fire-fighting pumps
The purpose of the article is to obtain empirical dependences for the characteristics of centrifugal fire pumps required for automation of calculations of fire extinguishing systems on ships using water. Research objectives: verification of consistency of data on pumps manufacturers; determination of the calculated dependence of heads, efficiency, power pumps VCN flow. The comparative analysis of the proposed design dependencies and pump manufacturer data confirmed the possibility of using the proposed dependencies in engineering calculations. The measurement data of the pump characteristics are in satisfactory agreement with the results of the calculation according to the quadratic laws of distribution. Deviation of experimental points from empirical dependences is connected with the instrumental effect. Graphs for characteristics of pumps NTSV-63/80, 2 - NTSV-63/100 are constructed. The example of calculation of the working point of the pumping unit using the approximate hydraulic characteristics of the water fire system of the vessel showed the high efficiency of the proposed techniques.