Table of Contents
What is cavitation how it can be avoided checked?
Air bubbles may form within the pump on the suction side, collapsing again with the higher pressure on the discharge side. This can create shock waves through the pump. This type of cavitation can be prevented by regularly checking all valves and joints, O-rings and mechanical seals for signs of leaks or erosion.
What is cavitation and what are its causes How will you prevent the cavitation in hydraulic machines?
To avoid cavitation while operating Hydraulic Turbines parameters should be set such that at any point of flow static pressure may not fall below the vapor pressure of the liquid. These parameters to control cavitation are pressure head, flow rate and exit pressure of the liquid.
How do you avoid pump cavitation Mcq?
In centrifugal pumps, cavitation may occur at the inlet of the impeller of the pump or at the suction side of the pump where the pressure is considerably low. So to avoid cavitation pressure on the suction side should be high.
What is cavitation in reciprocating pump?
Cavitation, or the formation of bubbles or vapor cavities in a liquid, results from rapid fluctuations in pressure. Two basic types of cavitation exist in reciprocating pumps: Suction cavitation can result from obstructed, clogged, or otherwise dysfunctional inlet pipes.
What is cavitation process?
Cavitation is a phenomenon in which the static pressure of a liquid reduces to below the liquid’s vapour pressure, leading to the formation of small vapor-filled cavities in the liquid. The process in which a void or bubble in a liquid rapidly collapses, producing a shock wave, is called inertial cavitation.
What is cavitation and what are its causes?
Cavitation happens when bubbles, or voids, form within a fluid because the pressure quickly drops below the vapor pressure. When the bubbles experience higher pressures they collapse, creating small shockwaves that, over time, damage parts. When these pressure waves punch tiny holes into parts, it’s called pitting.
What helps in avoiding cavitation in centrifugal pumps?
Some tips to prevent cavitation due to vaporization include:
- NPSHa > NPSHr + 3 ft or more safety margin.
- Lower temperature.
- Raise liquid level in suction vessel.
- Change out pump type.
- Reduce motor RPM.
- Use impeller inducer.
- Increase diameter of the eye of impeller.
Which of the following helps in avoiding cavitation in centrifugal pumps Mcq?
How do we prevent cavitation in pumps?
Pump Selection. The best way to prevent cavitation is to choose the correct pump for the application.
How we can avoid the pumps cavitation?
Design: Ensure that there are no sharp corners or curvatures of flow in the system while designing the pump.
Why does cavitation occur in centrifugal pumps?
Cavitation occurs when these nuclei become unstable and aid to sudden localized flow instability. Since centrifugal pumps operation is based on use of hydrofoils, this phenomenon of unstable nuclei happens in this case only.
How does cavitation occur in a pump?
Cavitation occurs in a pump when the temperature and pressure of the liquid at the suction of the impeller equals the vapor pressure. It can happen at low pressures and normal operating temperatures. Locally, it results in the liquid turning to a vapor and creating very high temperatures and pressures.