... and the tank cools, the pump Know and Understand Centrifugal Pumps liquid from a common system, and discharging the liquid into the same common system. Two pumps running in parallel offer ... tank levels, is seen this way (Figure 8- 13) . H BEP 1 lH I I I I VI 0 Q BEP Q t 10 GPM Figure 8- 13 Know and Understand Centrifugal Pumps Again, we see the importance of the ... this Hpl. When the tank and fluid arc heated, the Hp rises to its maximum. This is represented as Hp2 on the graph (Figure 8-15). Know and Understand Centrifugal Pumps Hf system piping...