Deep Well Pump Selection (1) According to the maximum allowable production of water wells to choose a multi-stage diving pump. The pump volume of the pump must match the actual water volume in the well. The pump volume must be equal to or slightly less than the actual production volume of the water well. Otherwise, strong pumping will inevitably occur. This will not only shorten the service life of the deep well submersible pump, Network destroyed, resulting in more than gushing sand, or even cause the wells scrapped. (2) deep submersible pump diameter must be consistent with the borehole diameter. In order to make the deep well pump go smoothly, pumping groundwater has space to collect quickly, without resistance but also reduce the pump running wear and tear, requiring the pumping pipe and pump body parts of the borehole diameter greater than the maximum diameter of the pump 20 ~ 40mm, In other words, the annular gap between the maximum diameter part of the pump body and the wellbore should be 10-20 mm in order to prolong the service life of the well and deep submersible pump. (3) Deep well submersible multi-stage pump pump head downhole position Deep well submersible pump head, must not be under the filter tube (flower tube) position, must be under the shaft wall (real tube) position, or pumping will rush More than sand or water well clumsy. According to the electric test curve of the hole, according to the hydrogeological conditions (the depth of the aquifer, the thickness of the aquifer, the aquifer lithology) and the operation of the pump according to the well and the adjacent well, Well completion structure (well diameter, flower pipe, pipe position) and well depth and pump selection to ensure that the next pump and pump operation, without any problems. (4) According to the allowable production of water source wells, deep well submersible pumps are selected to determine the specifications and models of deep well submersible pumps under the conditions permitted by hydrogeology and according to the influx of water from the water wells to determine the reasonable structure of the water source wells. (5) According to the total loss of head pressure deep well diving centrifugal pump. The diameter, head (series) and power of the deep well submersible pump are to be selected based on the total head pressure required for the submersible pump to deliver groundwater from the pump head to the surface pool or tower. Pressure increases with the number of impeller flow increases. Deep well pump impeller immersed in water work, only lift without suction. Rated lift and pump actual lift, can not be much difference, absolutely can not be higher than 25% of the actual lift. High pump head, the required motor power, likely to cause a larger pump on the string, the lighter wear impeller and leaf shell, heavy shell bearings (from the limit role) easy to stick with the pump coupling, Cause the pump can not operate, the motor overload winding will burn out. If a high-lift pump is used for low-head pumping, its flow will inevitably increase, even outside the working range, with high flow rate, low efficiency and high energy consumption. On the surface, it seems that the pumping speed can be accelerated, Improve pumping efficiency, but in fact gains and losses, should not be advocated, because the pump flow reaches or exceeds the maximum production of the well, the structure of the well outside the filter layer will be destroyed, the light will be a lot of wells into the sand, heavy wellhead The nearby ground will sink and jeopardize well safety. In addition, the pump in the long-term high-lift, high flow rate, low efficiency, high-speed operation, the water pump to speed up the flow, will destroy the chemical balance of groundwater, the water dissolved substances precipitation, sedimentation in the filter tube into the water gap or larvae L gap , Speeding up fouling, leading to clogged filters, and as time gets more and more clogged, pumps are subject to corrosion and cavitation
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