Page 136 - Know and Understand Centrifugal Pumps

The System Curve

H
FEET
CLOGGED FILTER

(Hf + Hv)l
NEW FILTER

Hs+Hp=O 0
0 Q
GPM
Figure 8-20

H
FEET

H BEP

0

BEP GPM

Fiaure 8-21

The pump will run to the right of its BEP within its sweet zone with
the new filter, and slowly over time, move toward the left crossing the
BEP as the filter screen clogs (Figure 8-21 and Figure 8-22).