The usage method of submersible pumps for wells mainly includes the following steps:
Inspection and preparation before installation
Check the water well:
Ensure that the diameter, verticality, wellbore quality, static water level, dynamic water level, water inflow, and water quality meet the requirements for the use of submersible pumps. The new well must be washed to remove mud and sand from the water.
Check the power supply equipment:
Ensure that the power supply lines and equipment can guarantee the normal operation of the submersible pump, and that the power supply voltage and frequency meet the usage conditions.
Check the submersible pump:
Check the insulation resistance of the submersible pump motor, which should not be less than 5 megohms. Check for cracks, scratches, and other damages on the cable, and replace it promptly if there is any damage.
Prepare tools and equipment:
Prepare various installation and usage tools, such as vertical tripods and hanging chains, to ensure their safety, reliability, and ease of use.
Installation of the crew
Connection between motor and pump body:
Apply rust proof oil to the stopper and contact surface of the motor and pump body, add paper pads to the flange surface, align the key slot of the coupling on the pump body with the key and positioning hole of the motor shaft, and tighten the flange bolts and positioning screws on the coupling.
Cable joint connection:
Connect the cable joint, immerse the joint in water after connection, and measure the insulation resistance again to ensure it is above 40M Ω.
Installation in the well:
Before going into the well, place a sealing gasket on the outlet end face of the pump body, install a short lifting pipe, install a pair of clamps at the flange root of the upper end of the short lifting pipe, put on a steel wire rope, and lift the submersible pump into the well. For submersible pumps with low head, flexible hoses can be used for direct lifting; For submersible pumps with high head, steel pipe installation is required.
Operation and Use
Flow control:
The flow rate of the selected pump should be less than the normal water inflow of the well, otherwise it will accelerate pump wear and reduce the life of the well.
Check the power supply voltage:
Ensure that the power supply voltage is controlled within a range of no more than or less than 5% of the rated voltage.
Pump operation:
Submersible pumps should be operated as close as possible to the design point, that is, within the range of flow design point 0.7~1.2. The actual head of the pump should be within 0.8-1 rated head.
Maintenance precautions:
The electric pump should be submerged vertically and not tilted when submerged in water. Do not transport water or mud with high sediment content. Regularly check the current value. If it exceeds the rated value by 10%, it may indicate impeller blockage or bearing wear.
Precautions during installation
Avoid forcibly lowering the pump:
If a blockage is found during the pumping process, rotate or pull the water supply pipe to overcome the blockage point. If various measures are still ineffective, do not forcefully lower the pump.
Installation depth:
Determine the depth of the pump to the bottom of the well based on the flow of sand and silt in the well. The pump should not be buried in silt or quicksand, and the distance from the pump to the bottom of the well should generally not be less than 3 meters.
Motor grounding wire setting:
Pay attention to the setting of the motor grounding wire. When the water supply pipe is made of steel pipe, lead the wire from the wellhead clamp. When the water supply pipe is made of plastic pipe, lead the wire from the screw of the water pump filter screen.
By following the above steps and precautions, the correct installation and safe use of submersible pumps for wells can be ensured.
