Pump selection should pay attention to what matters

pump selection considerations, which should be paid attention to pump selection

a, high lift water pump water pump selection considerations for low-lift pumping a lot of machinist think the lower water head, the smaller the motor load. Under this false understanding of misleading when water pump of choose and buy, often the selection of the pump head high. Actually for the pipeline centrifugal water pump or submersible pump, when the water pump model is determined, the size of the consumed power is proportional to the actual flow pump. And pump flow will decrease with the increase of the head, and the higher the head, the smaller the flow, and the smaller power consumption. Conversely, the lower the head, flow rate, the greater the consumption of power. Therefore, in order to prevent the motor overload, general requirements the actual water use head of the pump shall not be less than 60% of the labeling head. So when the high-lift pump used for low head pumping motor easy to overload and fever, serious when can burning motor. If emergency use, must be in the outlet pipe with a gate valve is used to adjust the water yield ( Small or use the content such as wood wall outlet) To reduce traffic, prevent motor overload. Pay attention to the motor temperature rise, if discover motor overheating, should be timely down outlet flow or turn it off. It is also easy to produce misunderstanding, some machinist think blocking outlet, forced to reduce traffic, can increase the motor load. In fact just the opposite, normal horizontal 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 Advice when picking pump products selected water pump manufacturer to form a complete set of diversion water pump control cabinet can have the corresponding protection function, to avoid burning motor due to overload superfluid, submersible pump products also has a built-in leakage leakage overload protection function of submersible pump products such as: QDN submersible pump, the series submersible pump products have the protection function. Second, the large diameter centrifugal pump with small pipe pumping a lot of machinist think it can improve the actual head, in fact the actual head of pump = total head to head loss. When the centrifugal pump type is determined, the total head is certain; Head loss mainly comes from the pipeline resistance, the smaller the diameter is obviously the greater the resistance, and therefore the greater the loss of head, so reduce the pipe diameter, the actual head of a centrifugal pump instead of increased, it will reduce, to lower the pump efficiency. By the same token, when small diameter water pump with large water pumping, also won't reduce the actual head of a centrifugal pump, may because of the line in order to reduce the loss of the head with the decrease of the resistance, the actual lift have improved. There is also a machinist think small diameter water pump with large water pumping, will greatly increase the motor load, after they think diameter increases, the water in the outlet pipe of pump impeller pressure is big, so will greatly increase the motor load. Little imagine, the size of the liquid pressure only associated with head high and low, and have nothing to do with the size of the pipe sectional area. Centrifugal pump impeller, so long as lift a certain size remains the same, no matter how big pipe diameter, pressure effect on the impeller is certain. Just pipe diameter increases, the flow resistance will decrease, and make the flow rate increases, power consumption are increasing. But as long as within the scope of rated head, no matter how to increase the pump diameter can be normal work, and also can reduce line losses, improve the efficiency of the pump. Third, installing a suction culvert, segment level, or curling do make gathered the air inlet tube, the lower conduit and vacuum pump, the centrifugal pump suction head is reduced, water yield decrease. The correct way is: the horizontal section should be slightly tilted towards the water, should not level, more may not be tilted upward. More than four, with the elbow inlet pipe road if use more elbow in the inlet pipe on the road, can increase the local flow resistance. And bend should turn in the vertical direction, are not allowed to turn in a horizontal direction, in order to avoid air.

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