Page 34 - Centrifugal Pumps Design and Application
P. 34
18 Centrifugal Pumps: Design and Application
Correction for Impeller Trim
The affinity laws described earlier require correction when perfor-
mance is being figured on an impeller diameter change. Test results have
shown that there is a discrepancy between the calculated impeller diaxne-
Figure 2-5. Efficiency for double-volute-type horizontally split multi-stage
pumps.
Figure 2-6. Impeller trim correction.
