Can a centrifugal pump experience vacuuming due to water in the oil medium?
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A centrifugal pump is used to transport naphtha; the fluid enters the pump from a buffer tank at a temperature of 40°C. If water is present in the naphtha, will this cause the centrifugal pump to experience vacuum conditions? Why? I would appreciate the advice from all the experts
It’s possible; when a centrifugal pump is rotating, the inlet is under negative pressure, and water at 40 degrees Celsius there may vaporize, resulting in cavitation and vacuum formation
It will not cause the centrifugal pump to go into vacuum. However, the water separates from the moisture, which causes increased noise during pump operation and higher operating current, as well as damage to the pump impeller and casing.
This post was last edited by ylb913 on 2016-6-16 06:08. If the motor is selected based on pumping requirements, it will experience an overcurrent and trip when water is pumped.
A positive displacement pump is better for the coexistence of water and oil
It won’t. At the same temperature, the saturated vapor pressure of naphtha is higher than that of water; even if naphtha contains water, the water will not vaporize and cause the pump to empty. It is only the higher density of water that leads to an increase in the shaft power required by the pump, but as long as the motor has sufficient load capacity, there is no problem.
What consequences will occur if the density is high, resulting in a high load on the motor?
The liquid temperature is 40 degrees; if the water content is very low, it should have no impact
This will cause an overcurrent in the motor, triggering the motor’s protection system to shut it down, and as a result the pump stops operating.
It mainly causes an overload of the pump current, which leads to tripping, right?