Page 165 - HVAC Pump Handbook
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HVAC Pump Performance
162 HVAC Pumps and Their Performance
Figure 6.16 Entrainment of air in HVAC pumps. (From John H. Doolin,
Centrifugal pumps and entrained-air problems, Chemical Engineering,
January 7, 1963, p. 103.)
hammering similar to cavitation. Tank depth does not deter the devel-
opment of the vortex.
Cavitation and air entrainment can cause similar noises in a pump.
A simple method of eliminating cavitation as a source of noise is to
run the pump at full speed and close the manual discharge valve on
the pump until only a small flow is passing through the pump.
Cavitation should cease, but air noise will persist at the low flow
through the pump.
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