When selecting a submersible multi-stage pump for an internal return system, it's crucial to consider the maximum allowable mining capacity of the water source well. The pump’s capacity must match the actual water inflow, ensuring it matches or slightly undershoots the well’s exploitation volume. Over-pumping can lead to issues like excessive wear on the pump, potential damage to the filtration system, and even sand surges, which could result in the well becoming unusable.
The diameter of the internal return pump should align with the well casing diameter. To facilitate smooth lifting and allow for rapid groundwater collection, the inner diameter of the casing should exceed the pump's maximum diameter by 20-40 mm, creating an annular gap of 10-20 mm between the pump and the well wall. This ensures minimal operational wear and extends both the pump's and the well’s lifespan.
The pump head of the internal return pump should point downward towards the solid pipe section rather than the perforated pipe section. This prevents sand surges during operation and avoids potential structural damage to the well. Determining the correct configuration involves analyzing the electrical measurement curves of the borehole, considering factors such as the aquifer's depth, thickness, and lithology, alongside the pump’s operational performance.
Selecting a deep well submersible pump requires evaluating the water source well's allowable mining volume within the constraints of hydrogeological conditions. Matching the pump’s specifications to the well’s inflow ensures optimal performance and proper well design.
When choosing a deep well pump, consider the total head loss. The pump’s diameter, head, and power should reflect the pressure needed to transport water from the wellhead to the storage tank or water tower. Each impeller stage contributes to the pump’s overall head, but excessively high heads can lead to mechanical issues like bearing wear or motor overload. Running a high-head pump at low heads increases flow rates beyond its optimal range, leading to inefficiencies, increased energy costs, and potential damage to the well structure due to excessive sand influx.
Long-term operation under high head and large flow conditions accelerates wear on the pump and disrupts groundwater chemistry. Deposits can form in the filter gaps, leading to blockages and premature pump failure. Therefore, the pump’s head should match or slightly exceed the total head loss experienced during the water supply process to maintain efficiency and longevity.
In conclusion, careful consideration of these factors ensures a reliable and efficient water extraction system while minimizing risks to both equipment and well integrity. Proper selection and maintenance practices are key to achieving sustainable water management solutions.
Pile Driver
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