Page 131 - Know and Understand Centrifugal Pumps

Know and Understand Centrifugal Pumps

FEET I
H

0 b Q
GPM

Let’s say that the needs of the system require X flow. Now we search for
a pump with a REP at X gpm, at a head falling right between Hpl and
Hp2 on the system curve. See the next graph (Figure 8-16).
The system’s AHp should fall within the pump’s primary or secondary
sweet zone. At the beginning of the operation, with the cold reactor
vessel, the pump operates to the right of the REP but within the sweet
zone, and as the reactor vessel is heated, the pump migrates on its curve
toward the left, crossing the BEP, to the other extreme of its sweet
zone. When the reaction is completed and the tank cools, the pump