Can screw pumps experience cavitation?
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Currently, a single-screw pump is needed for the project. Since screw pumps are capable of transporting gas-liquid mixtures, does that mean there is no need to worry about cavitation with screw pumps? No need to calculate the effective net positive suction head? If cavitation has an impact, what is the minimum NPSHa generally required for single-screw pumps?
Cavitation is a problem that should occur in any pump, considering the principle behind it
A screw pump is a positive-displacement pump, and theoretically, positive-displacement pumps can also experience cavitation. Generally, the cavitation problem of centrifugal pumps is taken into consideration. The inlet pressure of positive displacement pumps is already low, and some of these pumps can handle liquids containing vapor; therefore, even a slight amount of cavitation does not affect the pump’s operation. Screw pumps are commonly used to transport materials with high viscosity that are not prone to vaporization; therefore, the issue of cavitation is not a concern.
The screw pump is fine, but the water ring pump is experiencing cavitation
Yes, but it’s relatively small. As for exactly how small, it’s necessary to ask the screw pump manufacturer
It can transport both liquid and gas, but a specific evaluation is still needed. Are there any requests for gear-type twin-screw pumps, with stability and self-priming capabilities that exceed those of single-screw pumps and ordinary twin-screw pumps?
Cavitation occurs when the liquid being transported experiences a local pressure at the inlet or impeller that is lower than the saturated vapor pressure, causing the liquid to turn into gas. Subsequently, as the pressure increases, the gas suddenly transforms back into liquid, resulting in a shock wave of liquid. If the liquid being transported contains gas (gaseous form other than a liquid), gas compression will also occur during subsequent pressure changes, but the damage caused by cavitation will not be severe. Cavitation can occur in any pump, and it is necessary to consider the relationship between the inlet pressure and the saturated vapor pressure at that temperature.