1. Data and working hypotheses

The pump selected is a type NM 252 from Ingersoll Dresser Pumps with the following characteristics:

• maximum output flow: Q _RM = 1,100m ³ /h ;

• height of elevation: H _RM = 59 m ;

• maximum efficiency: η _M = 85% ;

• power consumption at maximum output: P _RM = 208.5 kW.

The H(Q), P (Q), η(Q) curves for the NM 252 pump are shown on the graph in figure 1 .

In our application, we adopt...