Reasons and solutions for excessive inlet pressure of MD horizontal multistage pumps for mining centrifugal pumps
The MD horizontal multi-stage pumps for mining centrifugal pumps must be designed before they are selected and put into use, because the pipe diameters of the MD horizontal multi-stage pumps for mining with different models and parameters are different. The type needs to be selected according to the actual working conditions of the user’s site. Let’s take a look at the common reasons for the high inlet pressure of the MD horizontal multistage pump for mining centrifugal pumps.
MD horizontal multistage pump
Common reasons for the high inlet pressure of MD horizontal multistage pumps for mining centrifugal pumps:
1. The outlet pipe of the MD horizontal multi-stage pump is blocked, or there is abrasion between the pump and the pump wall, which causes serious wear of the impeller, and there is a medium backflow phenomenon at the inlet and outlet of the pump;
2. The viscosity of the medium material conveyed by the water pump is too large, and the pipe diameter of the water pump is too small, which causes the inlet pressure of the water pump to be too high;
3. The on-site pipe diameter of the pump user is smaller than the diameter of the pump, which causes the resistance of the pump outlet to increase, that is, the pump pressure is too high;
4. The pump has exceeded its service life or is improperly used and maintained, too much stagnant material in the pump pipeline, and the medium is not transported smoothly in the pipeline, resulting in excessive pump pressure;
5. Air leakage in the inlet pipe of the water pump for conveying high-viscosity media caused cavitation in the water pump, and the outlet pressure of the water pump increased and it also made noise;
6. Forgetting to open the water pump valve when the water pump is turned on to convey the medium, which causes the resistance of the water pump pipeline to increase and the pressure is too high.
Mine centrifugal pump MD horizontal multi-stage pump inlet pressure is too high to the water pump mainly in the following aspects:
1. It seriously affects the metering accuracy of the pump and affects the performance parameters of the pump;
2, the inlet valve of the water pump is always open, and there is always a minimum flow at the inlet valve of the water pump. No matter how to adjust the pump, the flow can only be adjusted to a rough range, which cannot achieve the expected purpose;
3. It will also affect the strength of the water pump and shorten the service life of the power end components (crankshaft, bearing bush) of the water pump;
The solution to the high inlet pressure of the MD horizontal multistage pump for mining centrifugal pump:
1. The pressure of most water pumps is too high to obtain the required different pressures by adjusting the partial pressure of the valve. It is also possible to reduce the power input by adjusting the voltage of the water pump motor, or to change the inlet pressure of the water pump to a certain extent;
2. It is recommended to install a water pump pressure reducing valve, but it should be far enough away from the pump inlet pipe, otherwise it will affect the flow of the pump medium.
3. Add a pressure-retaining valve at the outlet of the water pump. The pressure of the pressure-retaining valve is set according to the system, and the maximum conservative pressure can be the reverse pressure difference;
4. Add a buffer pipe to the outlet pipe. The height of the buffer pipe depends on the system. Keep the height level with the highest point of the inlet liquid level.
