The misunderstandings in the use of self - priming pump for stainless steel are that a lot of machine hands think the lower the pumping lift, the smaller the motor load. Under the misguidance of this mistake, the pump's lift is often chosen when the pump is selected. In fact, for stainless steel self-priming pump, when the model of the pump is determined, the power consumption is proportional to the actual flow of the pump. And the flow of the pump will decrease with the increase of the lift, thus the higher the lift, the smaller the flow and the smaller the consumption power. On the other hand, the lower the lift, the greater the flow, the greater the power consumed. Therefore, in order to prevent the motor overload, it is generally required that the pump's actual pumping use lift should not be less than 60% of the calibrated lift. So when the high lift is used for low lift pumping, the motor is easy to overload and heat, and the motor can be burned down when it is serious. In case of emergency use, a gate valve must be installed in the outlet pipe to adjust the water discharge to reduce the flow rate and prevent the motor from overloading. Pay attention to the temperature rise of the motor. If the motor is overheated, the flow or shutdown of the water outlet should be closed in time. This is also easy to misunderstand, some of the hands think that plugging out of the outlet, forced to reduce the flow of flow, will increase the motor load. In fact, on the contrary, the outlet pipe of the regular high power centrifugal pump irrigation and drainage unit is equipped with gate valves. In order to reduce the motor load during start-up, the gate valve should be closed first, then the gate valve will be opened gradually after the motor starts.
Large diameter water pump with small water pipe pumping
The misunderstanding of the use of self - priming pump for stainless steel, many machine hands think this can improve the actual lift, in fact, the actual lift of the pump = the total lift — loss lift. When the pump type is determined, the total lift is certain; lift loss mainly comes from the pipeline resistance, smaller diameter obviously the greater the resistance, so the lift loss is bigger, so reducing the diameter of the pump, the actual head can only be increased, it will reduce, resulting in the decline in pump efficiency. Similarly, when the small diameter pump pumps with large water pipes, it will not reduce the actual lift of the pump, but it will reduce the loss lift and reduce the actual lift of the pump because of the reduction of the resistance of the pipeline. Also the organic hand thinks that when the small tube pump pumps with large water pipes, it will increase the load of the motor greatly. They think that after the diameter increases, the pressure of the water in the outlet pipe will increase to the impeller of the pump, which will greatly increase the load of the motor. It is not known that the size of the liquid pressure is only related to the height of the head, but has nothing to do with the section size of the water pipe. As long as the lift is certain, the impeller size of the pump is constant, no matter how large the diameter of the pipe is, the pressure on the impeller is certain. Only when the diameter of the pipe increases, the flow resistance will decrease, and the flow rate increases, and the power consumption will be increased appropriately. But as long as the rated head is in range, no matter how the diameter increases, the pump can work normally, and it can also reduce the pipeline loss and improve the efficiency of the pump.
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