Process Section – Daily Hydrogenation Process Knowledge Question No. 031
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What are the phenomena of cavitation? Answer: When cavitation occurs in a pump, noise can be heard inside the pump. When cavitation is severe, the pump body vibrates; at this point, both flow rate and head decrease, and the pump may even become empty of fluid. In serious cases, it takes anywhere from 1–2 hours to several dozen hours for the pump’s impeller to be eroded into a porous or even sponge-like shape.
Causes noise and vibration in the pump； Cavitation severely disrupts the energy conversion between the impeller and the fluid, reducing the pump’s performance; in severe cases, it can even cause the flow of liquid to be interrupted, rendering the pump non-functional
Cavitation refers to the phenomenon where an increase in the installation height of a centrifugal pump leads to a decrease in the pressure inside the pump. The lowest point of pressure within the pump is usually located slightly downstream of the inlet to the impeller blades; liquid rushes toward the center of the bubbles at high speeds, resulting in impacts with very high frequencies and intense instantaneous pressures. This phenomenon is known as cavitation
When cavitation occurs in a pump, noise can be heard inside the pump; when cavitation is severe, the pump body vibrates. At such times, both flow rate and head decrease, and in extreme cases the pump may even become empty of fluid. In serious situations, it can take anywhere from 1–2 hours to several dozen hours for the pump’s impeller to be eroded into a porous or even sponge-like shape.
Cavitation causes noise and vibration in pumps: when bubbles collapse, the liquid particles collide with each other as well as with the wall surfaces, generating noises of various frequencies. In severe cases, a ‘cracking’ explosive sound can be heard inside the pump, simultaneously causing vibration in the unit. The vibration of the unit further promotes the formation and collapse of more bubbles; this mutual reinforcement leads to intense cavitation resonance, forcing the unit to shut down, otherwise it will be damaged.
When cavitation occurs in the pump, noise can be heard inside it; when cavitation is severe, the pump body vibrates. At such times, both flow rate and head decrease, and the pump may even become empty of fluid. In serious cases, this condition can last from 1–2 hours to several dozen hours, during which time the pump’s impeller is eroded until it becomes porous or even takes on a sponge-like appearance
When cavitation occurs in a pump, noise can be heard inside the pump; when cavitation is severe, the pump body vibrates. At such times, both flow rate and head decrease, and in extreme cases the pump may even become empty of fluid. In serious situations, it can take anywhere from 1–2 hours to several dozen hours for the pump’s impeller to be eroded into a porous or even sponge-like shape.
Cavitation refers to the phenomenon that as the installation height of a centrifugal pump increases, the pressure inside the pump decreases. The lowest point of pressure within the pump is usually located slightly downstream of the inlet to the impeller blades; liquid rushes towards the center of these bubbles at high speeds, resulting in high-frequency, intense pressure fluctuations. This phenomenon is known as cavitation.
Abnormal noises inside the pump; reduced pumping capacity of the pump; increased vibration of the pump
When the pressure at the impeller of a centrifugal pump is lower than the saturated vapor pressure of the liquid, the liquid begins to vaporize, generating numerous bubbles. When the bubbles enter the high-pressure area along with the fluid, they rapidly condense and burst under the influence of the high-pressure liquid.
Cavitation causes vibration and noise in the pump; meanwhile, as bubbles block the channels in the impeller during cavitation, both flow rate and head are reduced, efficiency declines, and in severe cases the pump cannot operate properly