Ever hear the old saying, “There’s more than reducing cavitation by increasing water pressure.
If you’ve ever seen a movie featuring divers, you’ll no doubt be aware that the deeper a diver goes, the more water pressure there is bearing down on him from above. The same goes for a centrifugal pump’s storage tank. The higher the water level inside the tank, the higher the pressure bearing down on the pump’s inlet, which is located at the bottom of the tank. This is the area in which cavitation bubbles are likely to form. The mathematical equation that illustrates this relationship is,
where, h is the depth of the water inside the tank. Let’s see what happens when we increase the water level,
72 in) = 2.592 PSI (2)When the water level is raised to 144 inches,
144 in) = 5.184 PSI (3) We see that by raising the water level in the tank from 72 to 144 inches, pressure at the bottom of the tank where the inlet is located is increased from 2.592 Next time we’ll see how simply elevating the tank has an impact on cavitation. |