Page 284 - Intro Predictive Maintenance
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Operating Dynamics Analysis 275
65% 70% 75%
200 Best Efficiency Point (BEP)
80%
75%
Total Dynamc Head (Feet) 100 65%
80%
150
70%
50
100 200 300 400 500 600 700 800 1000
FLOW in gallons per minute (GPM)
Figure 13–3 Simple hydraulic curve for centrifugal pump.
65% 70% 75%
200 Best Efficiency Point (BEP)
80% 80% 75%
Total Dynamc Head (Feet) 150 70% 65%
100
50
100 200 300 400 500 600 700 800 1000
FLOW in gallons per minute (GPM)
Figure 13–4 Actual centrifugal pump performance depends on total system head.
total pressure required to overcome all resistance at a given flow. This value includes
all vertical lift, friction loss, and back-pressure generated by the entire system. It deter-
mines the efficiency, discharge volume, and stability of the pump.
Total Dynamic Head. Total dynamic head (TDH) is the difference between the dis-
charge and suction pressure of a centrifugal pump. Pump manufacturers that generate
hydraulic curves, such as those shown in Figures 13–3, 13–4, and 13–5, use this value.
These curves represent the performance that can be expected for a particular pump
