Condition in which vacuum pockets form due to localized regions of low pressure at the vanes in the impeller of a centrifugal pump and cause vibration, loss of efficiency, and possible damage to the impeller?

Condition in which vacuum pockets form due to localized regions of low pressure at the vanes in the impeller of a centrifugal pump and cause vibration, loss of efficiency, and possible damage to the impeller?

• A. Cavitation
• B. Static Pressure
• C. Direct Pumping System
• D. Steamer Connection

Answer: (A)

Cavitation is the formation of vapor pockets caused by local low pressure as fluid passes through the impeller of a centrifugal pump. When the suction-side pressure near the vane roots drops below the liquid’s vapor pressure, tiny vapor bubbles form. These bubbles collapse violently as they’re carried into higher-pressure regions or strike the impeller surfaces, sending shock waves that cause vibration, noise, and erosion. The result is reduced efficiency and possible damage to the impeller. To prevent this, ensure adequate Net Positive Suction Head (NPSH) relative to what the pump requires, control flow and temperature, and avoid conditions that drive the local pressure below vapor pressure. The other terms don’t describe this hydraulic problem: they don’t refer to the formation and collapse of vapor pockets within the pump.

Cavitation is the formation of vapor pockets caused by local low pressure as fluid passes through the impeller of a centrifugal pump. When the suction-side pressure near the vane roots drops below the liquid’s vapor pressure, tiny vapor bubbles form. These bubbles collapse violently as they’re carried into higher-pressure regions or strike the impeller surfaces, sending shock waves that cause vibration, noise, and erosion. The result is reduced efficiency and possible damage to the impeller. To prevent this, ensure adequate Net Positive Suction Head (NPSH) relative to what the pump requires, control flow and temperature, and avoid conditions that drive the local pressure below vapor pressure. The other terms don’t describe this hydraulic problem: they don’t refer to the formation and collapse of vapor pockets within the pump.