45kW Stainless Steel Deep Well Pump with 78 m³/h Flow for High-Head Water Supply

The 250QJH78-113-45kW stainless steel deep well pump is a multistage submersible pump designed for deep well water extraction and high-head water supply applications.

With a rated flow of 78 m³/h, a rated head of 113 m and a matching motor power of 45 kW, this pump is suitable for agricultural irrigation, industrial water supply, municipal waterworks, groundwater extraction, mining and construction projects.

The pump and submersible motor operate underwater as an integrated unit, helping reduce the need for above-ground pump-room space. Its stainless steel construction can provide improved corrosion resistance and mechanical strength for demanding water supply environments.

The exact stainless steel grade, outlet diameter, number of stages, voltage and other technical details can be configured or confirmed according to the water quality and project requirements.

Note: Product configurations may vary between manufacturers. Final specifications must be confirmed using the quotation, contract, nameplate, dimensional drawing and performance curve.

The model "250QJH78-113-45kW" can generally be interpreted as follows:

• 250: Series specification or well diameter designation; the minimum required well diameter must be confirmed from the dimensional drawing.
• QJH: Series designation for the deep well submersible pump. The precise meaning may vary by manufacturer.
• 78: Rated flow of approximately 78 m³/h.
• 113: Rated head of approximately 113 m.
• 45kW: Matching motor power of 45 kW.

The 250QJH78-113-45kW stainless steel deep well pump can be used for:

• Deep well and borehole water extraction
• Agricultural and farmland irrigation
• Garden and landscape irrigation
• Raw-water intake for water treatment plants
• Industrial process water supply
• Cooling-water system replenishment
• Reservoir and storage tank filling
• Municipal water supply projects
• Mining and construction dewatering
• Elevated tank and water-tower supply
• Long-distance water transmission
• Pressure boosting in suitable water supply systems

This pump is designed for applications where ordinary small submersible pumps cannot provide the required combination of flow and head.

Its 78 m³/h rated flow supports high-volume water delivery, while the 113 m rated head helps overcome vertical elevation, pipeline resistance and outlet pressure requirements. The 45 kW motor provides the power required for demanding and continuous water supply duties.

When correctly selected and installed, the pump can offer:

• Stable water delivery
• Efficient multistage pressure boosting
• Compact underwater installation
• Reduced above-ground space requirements
• Flexible system configuration
• Compatibility with automatic and variable-frequency controls
• Improved durability through appropriate material selection

To verify whether this model is suitable for your project, please provide the following information:

1. Well diameter and total well depth
2. Static water level
3. Dynamic water level during operation
4. Required hourly flow rate
5. Required pressure at the discharge point
6. Vertical distance from the dynamic water level to the discharge point
7. Horizontal pipeline length
8. Pipeline diameter, number of bends and valve arrangement
9. Power supply voltage and frequency
10. Required starting or control method
11. Water temperature and pH value
12. Sand content and chloride concentration
13. Daily operating time
14. Continuous or intermittent operating requirements

The total required head should not be calculated using the well depth alone. It should include the vertical lifting height from the dynamic water level, required outlet pressure, pipeline friction loss and local resistance from valves and fittings.

The final operating point should be checked against the manufacturer's pump performance curve.

Before installation, verify the well diameter, well straightness, water level and water quality. The pump must be able to enter the well without contacting or becoming trapped against the well casing.

The following installation practices are recommended:

• Check the motor voltage, phase sequence and insulation resistance before installation.
• Use correctly sized underwater power cables.
• Seal all underwater cable joints according to professional electrical installation standards.
• Keep the pump adequately submerged during operation.
• Maintain sufficient distance between the pump inlet and the well bottom.
• Prevent the pump from drawing sediment from the bottom of the well.
• Install a suitable non-return valve and isolation valve in the discharge pipeline.
• Do not use the electrical cable to lift or suspend the pump.
• Use an appropriate lifting cable or rising pipe support system.
• Confirm the direction of rotation before continuous operation.
• Monitor voltage, current, flow and discharge pressure during commissioning.
• Do not operate the pump without water.
• Do not run the pump for extended periods against a fully closed discharge valve.
• Install dry-running, overload, phase-loss and overcurrent protection where required.

Regular monitoring can help identify operating problems before they cause serious equipment damage.

Record the following information during operation:

• Operating voltage
• Operating current
• Water flow
• Discharge pressure
• Insulation resistance
• Dynamic water level
• Operating noise and vibration

Stop the pump and inspect the system if there is a significant reduction in flow, abnormal current, unstable pressure, unusual vibration or excessive noise.

Common causes of performance changes include a falling water level, blocked inlet, worn hydraulic components, pipeline leakage, incorrect rotation, voltage imbalance and sediment accumulation.