Installing a bore pump is a critical process that ensures a reliable water supply for agricultural, industrial, or domestic use. Proper installation not only guarantees optimal performance but also extends the lifespan of the pump. This blog provides a step-by-step approach to bore pump installation, emphasizing safety and efficiency.
Understanding Bore Pumps
Bore pumps, commonly known as submersible pumps, are designed to operate underwater, extracting water from deep wells or boreholes. They are essential in areas where groundwater is the primary water source. These pumps are submerged in the water they are set to pump, which aids in cooling the motor and reduces the risk of cavitation.
Pre-Installation Considerations
Before starting the installation process, it’s crucial to assess the following:
1. Borehole Specifications
- Diameter and Depth: Ensure the borehole’s diameter is compatible with the pump size. For instance, a 4-inch pump requires a minimum borehole diameter of 110mm. Verify the depth to determine the appropriate pump model and power requirements.
- Water Yield: Consult the borehole driller’s report to ascertain the well’s output. The selected pump’s capacity should not exceed 65% of the borehole’s maximum tested yield to prevent over-extraction.
2. Water Quality
- Sand Content: High sand content can damage the pump. It is recommended that the sand content does not exceed 0.25%.
- Water Temperature: Ensure the water temperature does not surpass 35°C to maintain the safety of the pump’s components.
Essential Components and Tools
- Pump and Motor Unit: A compatible submersible pump and motor.
- Drop Cable: Specialised submersible cable to supply power to the pump.
- Rising Main (Delivery Pipe): Typically made of polyethylene or galvanized steel, facilitating water delivery to the surface.
- Control Panel: Manages the pump’s operation, offering protections like overload and dry run prevention.
- Safety Rope: Preferably stainless steel, used to support the pump during installation and operation.
- Cable Splice Kit: For waterproofing the connection between the motor cable and the drop cable.
- Installation Tools: Wrenches, screwdrivers, insulation tape, and a tripod or crane for lowering the pump.
Step-by-Step Installation Process
1. Assembling the Pump and Motor
- Coupling: Securely couple the pump to the motor, ensuring alignment and tightness. Check for free rotation and adequate play between the shafts.
- Water Filling: If the motor isn’t pre-filled, top it up with clean, cold drinking water mixed with an anti-corrosive agent. Remove any air bubbles by gently moving the motor.
2. Electrical Connections
- Cable Splicing: Join the motor cable to the drop cable using a waterproof splice kit. Ensure the joint is secure and insulated to prevent water ingress.
- Direction of Rotation: Briefly power the motor to verify its rotation direction matches the manufacturer’s specifications. For three-phase motors, if the direction is incorrect, interchange any two-phase connections at the control panel.
3. Preparing the Borehole
- Cleaning: Remove any debris from the borehole to prevent contamination and potential damage to the pump.
- Shrouding: In cases where the pump is installed below the water inlet level or in open water, fit a shroud to ensure adequate cooling and prevent sediment ingress.
4. Lowering the Pump
- Attachment: Connect the rising main to the pump’s discharge outlet, ensuring all joints are leak-free. Attach the safety rope to the pump for support.
- Cable Management: Secure the electrical cable and any probes to the rising main at regular intervals (approximately every 2 meters) using durable tape. This prevents entanglement during installation.
- Lowering Mechanism: Utilise a tripod with a chain block or a crane to steadily lower the pump into the borehole. Avoid abrupt movements to prevent damage. Ensure the pump is positioned at least 3 meters above the borehole’s bottom to prevent silt intake.
5. Final Connections and Testing
- Control Panel Setup: Connect the drop cable to the control panel, ensuring all connections are secure and compliant with electrical standards.
- Earthing: Properly ground the system to prevent electrical hazards.
- Initial Testing: Partially open the delivery valve and power the pump. Observe the system for any irregularities, such as unusual noises or vibrations. Gradually open the valve to its operating position once stable operation is confirmed.
Safety Precautions
- Voltage Monitoring: Regularly check for voltage fluctuations. Operating the pump under low or high voltage conditions can reduce its efficiency and lifespan.
- Regular Maintenance: Periodically inspect the pump and its components for wear and tear. Replace any damaged parts promptly to ensure continuous and efficient operation.
- Avoid Dry Running: Ensure the pump is always submerged during operation.
Conclusion
Proper bore pump installation is essential for ensuring an efficient and long-lasting water supply system. By carefully assessing borehole specifications, using the right tools and components, and following a structured installation process, you can maximise the pump’s performance and lifespan.
Regular maintenance, voltage monitoring, and ensuring the pump remains submerged are crucial for preventing damage and ensuring smooth operation. Whether for agricultural, industrial, or domestic use, a well-installed bore pump provides a reliable and sustainable water source. If you’re unsure about any step, contacting a professional can help ensure a safe and efficient installation.
Lois Lane is a professional blogger and a seasoned Content writer for wellhousekeeping.com. With a passion for simplifying complex Home Decor topics, he provides valuable insights to a diverse online audience. With four years of experience, Lois has polished his skills as a professional blogger.
