Deep well pumps, as key equipment for groundwater extraction and transportation, are widely used in farmland irrigation, urban and rural water supply, and industrial water intake. Their construction quality directly affects the safety, efficiency, and lifespan of the pump station. Therefore, strict construction standards must be followed, with standardized and meticulous control implemented at every stage, from well preparation and equipment installation to commissioning and acceptance.
In the early stages of construction, a comprehensive survey and assessment of the well conditions should be conducted. This includes verifying the geological structure, well depth, well diameter, static and dynamic water level variations, and well wall stability. It is crucial to ensure that the wellbore verticality meets design requirements, avoiding pump jamming or increased hydraulic loss due to well inclination or localized diameter reduction. For loose or easily collapsible formations, casing or cementing measures should be used to ensure the well quality meets the pump installation requirements. The well water quality must be tested to confirm the absence of excessive sediment, corrosive ions, or other harmful components to prevent premature damage to the pump body material and mechanical seals.
The installation procedures for the well casing and pump body must be performed according to standards. Well casing connections must ensure coaxiality and sealing. When using threaded or flanged connections, the specified torque must be applied, and sealing materials must be used to prevent leakage. During the lowering of the deep well pump, the speed should be uniform and smooth to avoid impacting the well wall and pump body. Special clamps should be used to secure the pump shaft or pump head at the hoisting position to prevent swaying. Before assembling the pump body and motor, check the tightness and rotational flexibility of each component, and add an appropriate amount of lubricating grease as required by the manufacturer. Waterproof, high-tensile-strength downhole cables must be used, laid along the outside of the well casing or inside a dedicated protective conduit, with fixed points at regular intervals to prevent wear and breakage caused by water flow or mechanical pulling during pumping.
Electrical and control system installations must comply with safety regulations. Motor wiring must use waterproof junction boxes, and cable joints must be double-insulated and waterproofed. Grounding resistance must meet relevant standards to prevent leakage or lightning strike risks. The control cabinet should be located in a dry, well-ventilated, and easily accessible location, and equipped with overload, phase loss, and low water level protection to ensure automatic shutdown in abnormal situations. For systems requiring variable frequency speed control, the compatibility between the frequency converter and the motor must be ensured, and the cable length and shielding measures must meet anti-interference requirements.
The commissioning and operation phase should be implemented step by step. Before the initial start-up, check the correct rotation direction, then run the system briefly at low flow rates, monitoring current, voltage, vibration, and noise. Once no abnormalities are confirmed, gradually increase the flow rate to rated operating conditions. Record the flow rate, head, and power data at different water levels, compare them with the design curves, and determine if the pump performance meets the standards. During operation, regularly inspect for leaks in sealing areas, bearing temperature rise, and cable joint conditions, addressing any problems promptly.
Acceptance testing should cover all construction process documentation and on-site measurement results, including wellbore parameters, installation records, electrical testing reports, and trial operation data, forming a complete archive. Construction standards not only guarantee the current project quality but also establish a reliable basis for future operation and maintenance, thereby ensuring the long-term safe, stable, and efficient operation of the deep well pump system in various water intake applications.
