Liquid Ring Vacuum Pump Cavitation and Prevention Method

Usually, the cavitation can cut back the planning lifetime of the pump and cause premature failure. thus it’s continuously importing to foretold the cavitation occurs within the pump and to require necessary steps to stop it.

How Cavitation can happen Vacum Pump?

In a liquid ring pump, the cavitation is happening as a result of the vaporization of the seal liquid. it’s because of the pump operate at the pressure level region of seal liquid.

If the pump runs at the pressure level region, bubbles can kind within the seal liquid. because the bubble moves from low region to a high region, the bubble is imploded and build to avoid the area. this can cause the seal liquid to rush and fill the void area. As a result of this associate degree, abnormal noise and in-depth erosion or roughness of the pump internals are created. These phenomena are termed as cavitation.

Reason for Cavitation happens in pump

The following area unit the most important reason for cavitation takes place in vacuum pumps. They are

The operative pressure is adored (or below) the pressure level of the protection liquid
Sudden fluctuation or modification of pump operative purpose from high vacuum to low vacuum.
Sealing liquid temperature rises.

Methods to eliminate cavitation in the pump

Seal liquid Cooler

By mistreatment seal liquid cooler, the temperature of seal liquid is maintained below its boiling points. Thereby the flashing of seal liquid is prevented and maintain below its pressure level region. Refer below the figure for the cooler arrangement.

Low-pressure level Seal Liquids

Based on the operative pressure of the pump, the seal liquid shall be hand-picked should be having low-pressure level property. this can forestall the seal liquid from flashing and inflicting cavitation. The sealed liquid ought to be compatible with the method gas mixture and therefore the materials of the construction of the pump.

Inlet operative Pressure

Increase the water operative pressure (if this pressure is going to be tolerated by the process) of pump on the far side the pressure level region of seal liquid then cavitation is going to be prevented. sometimes this methodology is of most popular, as a result of dynamic the water operative pressure, the downstream of the pump can get affected.

Loading of the pump

If the loaded but five hundredth % of the planning capability, the pump is also operative at a lower absolute pressure. this could result in an increase in seal liquid temperature and cause cavitation. A vacuum regulator or air bleed valve may be wont to introduce an extra load, therefore, the pump is going to be ready to operate nearer to style|the planning|the look} capability (also design pressure)

Suction Pressure Booster arrangement

Normally the suction pressure of the pump is boosted by putting in a booster pump or ejector arrangement within the upstream of the liquid ring pump. The booster can compress and lift absolutely the pressure of the pump suction.

When compare with booster pumps, the ejectors’ area unit less capital and maintenance price due to tono moving elements. associate degree ejector works by mistreatment pressure energy of the motive to extend the speed of the entrained gas load. This produces the next absolute pressure at the outlet of the ejector. 2 styles of ejectors area unit a steam ejector that uses pressurized steam, associate degreed an atmospherical air jet that uses atmospherical air because of the motive.

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