When the clean water centrifugal pump is running, cavitation is an important hazard factor that affects the pump outlet flow and head. Since the impeller and upper and lower pump casings of the clean water centrifugal pump are made of cast iron, preventing cavitation of the impeller is one of the keys to ensuring the operation of the clean water pump. The methods to prevent cavitation of the impeller of a clean water centrifugal pump are as follows:
1: Correctly determine the suction height of the pump to ensure that the pressure at the inlet of the impeller is not lower than the vaporization pressure.
2: Minimize the loss of water head in the suction pipe. Because the greater the loss, the greater the pressure drop at the inlet of the water pump, and the easier the water will vaporize. Therefore, the length of the suction pipe should be shortened as much as possible, the accessories on the pipeline should be reduced, the inner wall of the pipe should be smooth and the diameter of the suction pipe should be increased appropriately.
3: The water pump is installed in the well. If cavitation is caused by high water absorption, the pump can be installed underground or below the ground, near the water absorption surface.
4: Use jet to increase inlet pressure.
5: Try to make the pump run under rated conditions. If the pump runs below the rated head or higher than the rated speed, the pump flow must be greater than the rated flow, and the water flow speed at the impeller inlet will inevitably increase, and the pressure at this place will further decrease. Therefore, it is not possible to arbitrarily reduce the pump head and increase the pump speed.
6: Install an inducer at the inlet of the water pump, or use anti-cavitation pump parts, etc.
