QJH Series 304 Stainless Steel Deep Well Submersible Pump with 150 m Head and 70–230 m³/h Flow

The QJH series is a range of vertical multistage deep well submersible pumps for high-flow, high-head water supply and drainage projects. Six models cover rated flows from 70 to 230 m³/h. Each model has a rated head of 150 m, while matched motor power ranges from 45 to 160 kW. All models use a three-phase 380V 50Hz power supply.

The pump sets use 304 stainless steel and are intended for clean water and mildly corrosive water compatible with this material. The pump and submersible motor operate underwater without surface priming, helping reduce above-ground space and operating noise. Typical duties include deep-well abstraction, industrial supply, agricultural irrigation, mine drainage, tank filling and long-distance water transfer.

Rated flows from 70 to 230 m³/h support different abstraction volumes, facility demands and pipeline capacities. A common rated head of 150 m simplifies model comparison within projects that have similar pressure requirements.

Grade 304 stainless steel provides good general corrosion resistance and mechanical strength in compatible water. Suitability should be checked against temperature, pH, chloride concentration, dissolved substances and other corrosive constituents.

Multiple impeller stages increase liquid pressure progressively, supporting deep lifting, long-distance transfer and systems requiring substantial outlet pressure. The final duty point must be verified against both the pump curve and system curve.

All six models use three-phase 380V 50Hz power. The control panel, cable size, starting method and protection settings must match the 45–160 kW motor rating and the capacity of the site electrical network.

The pump and motor work below the water level, eliminating surface priming and simplifying the surface layout. The specified submergence and cooling flow past the motor must always be maintained.

• Deep-well groundwater abstraction and raw-water transfer
• Municipal, industrial-park and factory water supply
• Agricultural irrigation and sprinkler systems
• Mine drainage and construction dewatering
• Reservoir, storage-tank and elevated-tank filling
• Long-distance water transfer and network boosting
• Industrial circulating water compatible with 304 stainless steel

Suitable for medium-capacity deep-well abstraction, irrigation and industrial make-up water duties requiring approximately 70 m³/h. Its lower matched power can suit projects with stable, moderate demand.

Rated at 90 m³/h for medium water stations, irrigation systems and factory water supply. Confirm that the sustainable well yield is not lower than the intended pumping rate.

Designed for duties near 115 m³/h at 150 m head, including industrial supply, raw-water transfer and water-conservancy projects. It may be used as a main pump or one unit in a parallel arrangement after engineering review.

Rated at 140 m³/h with a 90 kW motor for high-capacity deep-well lifting, mining water systems and long pipelines. Electrical design should specifically verify starting current, voltage drop and motor protection.

Intended for centralized supply, agricultural water projects and large industrial duties requiring approximately 170 m³/h. Confirm the pump diameter, borehole clearance, cable space and lifting conditions before ordering.

The highest-flow model in this group is intended for major abstraction and transfer systems near 230 m³/h. Its 160 kW motor requires a complete review of transformer capacity, starting method, cable sizing and protection.

The submersible motor drives the shaft and multistage impellers. Water enters through the intake and gains pressure as it passes through successive impeller and diffuser stages. It then flows through the discharge, riser pipe and surface network. Because the complete unit operates underwater and the surrounding liquid contributes to motor cooling, well velocity, minimum submergence and starting frequency must comply with the manufacturer's requirements.

A rated head of 150 m is not the same as total well depth. Total dynamic head normally includes:

• Vertical lift from the dynamic water level to the discharge point
• Required residual pressure at the outlet or downstream system
• Friction losses in the riser pipe and surface pipeline
• Local losses through elbows, valves, non-return valves and fittings

The calculated system curve should be compared with the pump curve to verify the actual operating point. Selecting only by well depth or motor power may result in insufficient flow, excess energy consumption, overload or unstable operation.

Grade 304 is suitable for many clean-water and mildly corrosive-water duties, but it is not universal. Water with high chloride content, seawater, strong acids or alkalis, high-temperature liquids and highly abrasive solids may require 316, 316L, duplex stainless steel or another specialized material. Provide a complete water analysis and obtain written material confirmation before selection.

• Required flow and total dynamic head
• Measured borehole internal diameter, well depth, static level and dynamic level
• Sustainable well yield and seasonal variation
• Planned pump setting depth
• Discharge elevation, pipe length, pipe diameter and valve arrangement
• Temperature, pH, chloride level, sand content and full water analysis
• Three-phase 380V 50Hz network capacity and permitted starting current
• Continuous or intermittent duty, daily operating hours and starting frequency
• Requirements for the control panel, cable, riser pipe, sensors, spares and certifications

• Confirm the borehole internal diameter, straightness, maximum pump-set diameter and cable clearance before installation.
• Develop and flush new wells thoroughly to reduce abrasive sand and debris entering the pump.
• Use correctly rated riser pipes, lifting equipment and waterproof cable joints. Never lift or suspend the pump by its power cable.
• Keep the operating water level above the specified minimum submergence and maintain effective cooling flow around the motor.
• Select direct-on-line, soft-start, reduced-voltage or compatible variable-frequency starting according to motor rating and grid conditions.
• Provide short-circuit, overload, phase-loss, under-voltage, over-voltage, dry-run and leakage protection as required.
• Record voltage, current, pressure, flow, vibration and discharged-water sand content after initial start-up.
• Qualified personnel must complete installation, wiring, commissioning and maintenance in accordance with the manual and local regulations.

Yes. Based on the supplied model data, all six models have a rated head of 150 m, while rated flow and matched power differ. Actual operating flow and head still depend on the pump curve and system resistance.

This should not be assumed from the model alone. Model definitions and actual pump diameters can vary, and space is also needed for the cable, joints and installation clearance. Provide the measured borehole diameter and confirm the approved dimensional drawing.

Grade 304 should generally not be used for seawater without a dedicated engineering review. Chlorides can cause pitting and crevice corrosion. Consider 316L, duplex stainless steel or another seawater-resistant material, and review the seals, cable and motor construction.

A VFD can be evaluated only after confirming that the motor is suitable. Minimum frequency, acceleration and deceleration, cooling velocity, output filtering and motor protection must be set correctly. Drive capacity and cable length must also be considered.

Select from the required duty point and approved pump curve rather than using maximum flow as a continuous operating point. The selected duty should remain within the permitted range while considering efficiency, power margin and sustainable well yield.

Provide the target flow, total head, borehole data, water analysis, pipeline details, power conditions and installation requirements. The supplier can then verify the model, material, motor, controls and accessories before issuing a technical proposal and quotation.