Page 94 - Root Cause Failure Analysis

Pumps 85

I I I I I I I I I
100 200 500 400 500 600 700 800 lo00
in polln# per minute (CPU)
Figure 7-6 Actual cenhifugal pump performance depends on total system head.

The best operating point for any centrifugal pump is called the best efJiciency point
(BEP). This is the point on the curve where the pump delivers the best combination of
pressure and flow. In addition, the BEP specifies the point that provides the most sta-
ble pump operation with the lowest power consumption and longest maintenance-free
service life.

I I I I I I I I I
100 200 300 400 wo 800 m 800 loo0
Flow (in gallons per minute, gpm)
Figure 7-7 Brake horsepower needs change with process parameters.