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The reason of burning motor is caused by high lift of centri

Centrifugal pump lift height and resistance, is used to overcome the high-lift pump work at high lift his flow is the flow of design point, if in low-lift work, is equal to the pump outlet resistance decreases, the pump flow rate will increase, motor overload, to a certain degree will be burning motor. For example a feed water pump head is 50 meters, flow of 50 cubic meters/hour, when it to 50 meters high feed water, its flow is 50 cubic meters per hour, when it to 40 m above water, its height and reduce its flow resistance could reach 80-80 cubic meters per hour above, then the motor will fever or burned.

Many novices believe that the lower the pumping head, the smaller the motor load. In this kind of misunderstanding, the water pump is often selected for high lift. In fact, for centrifugal pumps, when the pump model is determined, the power consumption is proportional to the actual flow of the pump. The flow rate of the pump decreases with the increase of the lift, so the higher the lift, the smaller the flow, the smaller the consumption power. Conversely, the lower the head, the larger the flow, the greater the power consumption. Therefore, in order to prevent motor overload, the actual pumping use of the pump should not be less than 80% of the nominal head. Therefore, when the high lift is used for the low lift pumping, the motor is easily overloaded and hot, and the motor can be burnt when serious. In case of emergency use, you must install a gate valve to adjust the amount of water in the outlet pipe (or block the small outlet with wood and other things) to reduce the flow and prevent motor overload. Pay attention to the temperature rise of the motor. If the motor is overheating, turn off the small outlet flow or power off in time. This is also easy to misunderstand. Some beginners think that blocking the outlet and forcing down the flow will increase the motor load. In fact just the opposite, formal power centrifugal pump irrigation and drainage units are fitted on the outlet pipe of gate valve, in order to reduce the unit startup motor load, should be closed gate, after waiting for motor start and gradually open the gate. That is the reason why


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