As a key piece of equipment for extracting groundwater, the installation quality of deep well pumps directly determines their operational efficiency, reliability, and service life. Since deep well pumps need to operate underground for extended periods, the installation process involves multiple stages, including well condition assessment, well casing and pump body positioning, electrical connections, and system commissioning. Strict adherence to technical specifications is essential to ensure stable operation under complex hydrological and geological conditions.
Before installation, a comprehensive wellbore survey and verification should be conducted. Accurate measurements of well depth, diameter, verticality, and the range of static and dynamic water level changes are necessary to confirm the well wall's stability and absence of defects such as collapse or diameter reduction. For loose or easily collapsing strata, casing protection or cementing measures should be implemented in advance to prevent well wall instability during installation and operation from affecting the pump body. Well water quality samples should be taken for testing to determine indicators such as sand content, corrosive components, and water temperature, in order to rationally select the pump type and materials and provide a basis for subsequent maintenance.
The installation of the well casing and pump body requires meticulous operation. Well casing connections must ensure coaxiality and sealing. Threaded or flanged connections must be tightened to the specified torque value and reinforced with waterproof sealing material to prevent leakage. When lowering the deep well pump, specialized lifting tools should be used, maintaining a uniform and stable speed to avoid impact on the well wall and pump body. The pump body and motor should be assembled on the ground, and their rotational flexibility, tightness, and lubrication checked. Only after confirming there are no abnormalities should they be slowly lowered into the well. During lifting, lateral forces on the pump bearings should be avoided to prevent uneven wear or jamming.
Cable laying is a crucial part of the installation process. Specialized waterproof cables with tensile strength meeting downhole requirements should be selected and laid along the outside of the well casing or inside a dedicated protective conduit. Fixing points should be set at appropriate intervals to prevent wear and breakage caused by water flow or mechanical pulling. Cable joints must be double-insulated and sealed within waterproof junction boxes to ensure electrical safety in long-term immersion environments. The electrical system installation should comply with relevant national and industry standards. Motor wiring must be correct, grounding resistance must meet specifications, and the control cabinet should be located in a dry, well-ventilated, and easily accessible location, equipped with overload, phase loss, and water level protection functions.
System commissioning is required after installation. Before the initial start-up, verify the correct rotation direction. It is recommended to run the system briefly at low flow rates, monitoring current, voltage, vibration, and noise. After confirming no abnormalities, gradually increase the load to rated operating conditions. Record flow rate, head, and power data under different water level conditions and compare them with the design performance curve to verify the pump's operating point is reasonable. During commissioning, check for leaks in all sealing parts, ensure normal bearing temperature rise, and test the control system's linkage functions to ensure the reliability of water level sensing, automatic start/stop, and protection mechanisms.
Complete installation records should be kept, including wellbore parameters, well pipe connections, pump lowering depth, cable routing, electrical test data, and commissioning results, forming complete as-built documentation to provide a basis for subsequent operation and maintenance. The installation of deep well pumps not only requires a rigorous process, but also depends on the technical skills and meticulous attitude of the operators. Only by meeting the standards at every step can we ensure that the equipment operates safely and efficiently in the long term and fully utilizes its function of extracting groundwater.