## Suction Tanks

There are a variety of shapes and configurations for suction tanks. They may be vertical or horizontal, cylindrical, or rectangular. Outlets from the tanks may be vertically downward, horizontal, from either the side or bottom of the tank, or in the case of a pressurized tank, vertically upward. The formation of vortices in the tank can cause air or gas entrapment even when the tank outlet is fully submerged. This can cause pulsating pump flow, noisy operation or a reduction in pump performance.

To determine minimum submergence of the outlet pipe in the tank, the Hydraulic Institute recommends the following relationship:

S/D = 1.0 + 2.3FD, where FD = Froude number = V/(gD)°'6 D = outlet fitting diameter, ft (m) S = submergence, ft (m) V = outlet fitting velocity, ft/s (m/s) g = acceleration of gravity, ft/s2 (m/s2)

Figure 20 shows examples of how to apply the calculated submergence value depending on tank orientation and outlet configuration. Figure 21 shows how to use the above equation to calculate velocity for the Froude number calculation, depending on type of vertical can (riser)

turbine pump bowl ass embl vertical can (riser)

turbine pump bowl ass embl

## Renewable Energy Eco Friendly

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable.

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