A submersible pump dredger provides a practical solution for extracting loose sand directly from underwater deposits while keeping the overall dredging system relatively compact. Instead of installing a conventional horizontal sand pump on the deck and relying on a long suction line, the submersible pump works underwater, close to the material itself. Therefore, the system can reach deeper working areas while reducing many of the suction limitations associated with surface-mounted pumps.

The OCEAN Pump submersible pump dredger described in this project is designed for soft and loose sand in suitable rivers, lakes, ponds, and similar waters. It combines a floating pontoon structure, a ZJQ150-22-22 submersible sand pump, a high-pressure water pump, a 50 kW diesel generator, an electric hoist, anchoring equipment, and a complete 500-meter floating discharge pipeline. Consequently, the customer receives a coordinated dredging system rather than simply a standalone pump.

Its dredging performance is designed around a suction depth within 20 meters, an actual sand output of approximately 40–45 m³/h, and a discharge distance of 500 meters under the specified working conditions. Moreover, the 6-inch submersible sand pump can pass particles up to 32 mm in diameter, which gives the dredger practical solids-handling capability when working with suitable sand deposits.

The system uses a 22 kW submersible sand pump with a rated flow of 150 m³/h and head of 22 meters. Meanwhile, a 5.5 kW high-pressure water pump helps disturb the sand around the suction area. A 37 kW frequency-conversion control box provides pump control, while a 50 kW soundproof diesel generator supplies independent electrical power.

Furthermore, an electric hoist raises and lowers the submersible pump. Three anchors and 200 meters of anticorrosion rope support positioning, while HDPE pipes and MDPE floaters form the floating discharge line.

However, successful sand dredging depends on more than equipment specifications. Material conditions, pipeline arrangement, water depth, sand concentration, and operating technique all affect production. Therefore, understanding how each component works together is essential before selecting or operating a submersible pump dredger.

1. What Is a Submersible Pump Dredger?

A submersible pump dredger is a floating dredging system that places the main sand pump directly underwater.

This arrangement differs from many traditional suction dredgers. A conventional system may install the pump above the water level and use a suction pipe extending downward toward the sand bed. However, suction performance becomes more challenging as working depth increases.

A submersible pump takes another approach. The pump descends toward the underwater material and operates while submerged. Therefore, the pump does not need to lift the slurry through a long suction pipe before the mixture reaches the impeller.

For this particular configuration, an electric hoist controls the position of the pump. As dredging progresses, the operator can raise or lower the pump according to the working depth.

Meanwhile, the floating platform supports the generator, electrical equipment, hoisting system, and other necessary components. As a result, the complete dredger can work as an integrated floating sand extraction system.

The design is particularly suitable for soft and loose sand material, which is the specified working condition for this machine.

2. Main Performance of the Submersible Pump Dredger

The dredging system has four important working parameters:

These figures describe the intended operating conditions of the complete submersible pump dredger, rather than simply the performance of the pump itself.

This distinction is important.

The ZJQ150-22-22 pump has a rated flow of 150 m³/h, but the actual sand production is specified at 40–45 m³/h. These two figures should not be confused.

Pump flow represents the total slurry volume passing through the pump, including both water and solids. Sand output, however, refers to the approximate volume of sand recovered during operation.

Therefore, a 150 m³/h pump flow does not mean that the dredger produces 150 m³ of sand every hour.

Actual production also depends on sand concentration and working conditions. Consequently, stating both figures provides buyers with a much more realistic understanding of dredging performance.

3. Compact Floating Pontoon Structure

The floating body provides the working foundation of the submersible pump dredger.

This configuration uses two side pontoons, each measuring:

4 m × 1 m × 1 m

The pontoon system also includes handrails and connecting steel. Therefore, the two floating sections can form a stable working platform for the dredging equipment.

A 2.2-meter-high portal frame supports the pump lifting arrangement.

Because the dredger works continuously around water, corrosion protection also matters. Therefore, the pontoon body receives anticorrosive paint to protect the steel structure during marine or freshwater operation.

The relatively compact dimensions provide another practical benefit. Large dredgers can create considerable transportation and mobilization challenges, especially when projects lie in remote inland areas.

In contrast, a smaller floating system can simplify transportation and site installation.

Furthermore, the pontoon layout provides sufficient working space for the essential equipment without turning the machine into an unnecessarily large vessel.

Consequently, this design balances flotation, equipment support, transportation, and practical operation.

4. ZJQ150-22-22 Submersible Sand Pump

At the heart of the submersible pump dredger is the ZJQ150-22-22 submersible sand pump.

Its main specifications include:

The pump works underwater near the sand bed. Therefore, it can draw the loosened sand-water mixture directly into the inlet.

Moreover, the 6-inch discharge size provides a practical balance between solids transportation and the compact nature of the overall dredging system.

The maximum allowed particle diameter reaches 32 mm. Consequently, the pump can tolerate suitable larger particles that may occur within loose sand deposits.

However, the dredger is specifically intended for soft and loose sand. Therefore, the 32 mm passage capability should not be interpreted as meaning that the machine is designed for continuous pumping of coarse gravel, large stones, fibrous waste, or hard compacted material.

Correctly matching the machine to the sediment remains essential for reliable performance.

5. Why Underwater Pump Positioning Matters

The location of the pump creates one of the most important differences between this machine and a conventional surface-pump dredger.

A surface-mounted sand pump must create suction through a pipe extending from the dredger toward the riverbed. As working depth increases, maintaining effective suction becomes more difficult.

However, the submersible pump dredger places the pump directly underwater.

Therefore, the pump works much closer to the material.

This arrangement helps explain why the dredger can operate at depths within 20 meters under the specified conditions.

Furthermore, direct underwater positioning allows the operator to move the pump vertically as the sand bed changes.

For example, after removing material from one layer, the pump can descend further. Likewise, the operator can raise it when repositioning the dredger.

Consequently, the lifting system and underwater pump work together as an important part of the dredging process.

6. High-Pressure Water Pump Supports Sand Collection

Even loose sand may settle densely enough that water movement alone does not always provide the desired feed concentration.

Therefore, the dredging system includes a 5.5 kW high-pressure water pump.

The water pump comes with a bottom valve and water pipe.

During dredging, the water system can disturb the sand around the pump intake. As a result, settled material becomes easier to mix with surrounding water.

The submersible sand pump can then draw this mixture into the pump and transport it through the discharge pipeline.

This process offers a simple but important advantage: the system actively helps feed material toward the main pump instead of relying entirely on natural sediment movement.

However, the specified dredger remains intended for soft, loose sand. The high-pressure water system does not transform it into a cutter dredger for hard clay or highly consolidated formations.

Therefore, customers should explain the sand-bed condition clearly before equipment selection.

7. Frequency Conversion Control for the Submersible Pump Dredger

The system includes a 37 kW frequency-conversion electric control box.

Variable-frequency control provides a useful way to manage the operation of the submersible pump.

Instead of treating the pump only as a fixed-speed machine, the control system allows more flexible management of motor operation.

This becomes useful because dredging conditions can change.

For instance, the pump may initially enter relatively clear water before reaching the sand bed. Later, slurry concentration can increase as the pump works deeper into the deposit.

Therefore, controlled operation can help operators respond more effectively to changing loads.

Furthermore, controlled starting can reduce sudden electrical and mechanical stress compared with uncontrolled starting methods.

As a result, the frequency-conversion system contributes to more manageable operation of the submersible pump dredger.

8. Independent Power from a 50 kW Diesel Generator

Dredging projects frequently take place far away from reliable grid electricity.

Therefore, this machine includes a 50 kW diesel generator set.

The generator supplies the electrical power required by the dredging system. Moreover, it comes with a soundproof enclosure.

Independent diesel-generated electricity provides an important operational advantage. The dredger does not need a permanent shore-based power connection before beginning work.

Consequently, contractors can use the machine in remote river sections, lakes, ponds, and other suitable locations where electrical infrastructure is limited.

The generator also creates a self-contained power arrangement. Instead of coordinating an external generator after the dredger arrives, the power system forms part of the complete equipment package.

Therefore, pump, control system, and power supply can be considered together during equipment design.

9. Electric Hoist for Pump Lifting

Because the sand pump operates underwater, the submersible pump dredger needs a reliable method to raise and lower it.

An electric hoist with motor and steel wire provides this function.

The hoist works together with the portal frame. During operation, the system lowers the pump toward the sand bed.

As dredging progresses, the operator can adjust the vertical position.

Furthermore, the hoist allows the pump to return to the platform when inspection or maintenance becomes necessary.

This feature simplifies access to the underwater pumping unit.

Without an effective lifting system, servicing a heavy submersible pump could become difficult. Therefore, the hoist is not merely an auxiliary accessory; it directly supports daily operation and maintenance.

10. Anchoring and Positioning Equipment

Stable positioning is essential during dredging.

If the floating platform moves excessively while the pump works near the bottom, maintaining a consistent dredging area becomes difficult.

Therefore, the system includes three anchors and 200 meters of 12 mm anticorrosion rope.

The pontoon also includes anchor rope fixing holes.

Together, these components allow operators to secure and adjust the dredger according to the working area.

Moreover, controlled positioning helps the pump work systematically across the sand deposit.

After completing one section, operators can reposition the dredger and continue with another area.

Consequently, anchoring equipment contributes directly to organized production rather than simply preventing the platform from drifting.

11. Wear-Resistant Rubber Discharge Hose

The initial discharge connection must accommodate movement between the pump system and the floating pipeline.

Therefore, the submersible pump dredger includes two pieces of wear-resistant rubber hose.

Each hose measures:

10 meters × 6 inches

The flexible hose provides a transition between the dredger and the more rigid HDPE discharge pipeline.

This flexibility becomes important because a floating dredger moves slightly with water conditions, while the pipeline also changes position.

Furthermore, the hose carries abrasive sand slurry. Therefore, wear resistance is important for maintaining service life.

Using a suitable flexible connection can also reduce mechanical stress that might otherwise transfer directly between the dredger and pipeline.

12. Complete 500-Meter HDPE Discharge Pipeline

One of the major features of this submersible pump dredger configuration is the complete 500-meter discharge pipeline.

The pipeline consists of:

• 6-inch HDPE pipe
• 11.5 meters per piece
• 44 pieces
• Approximately 500 meters total

HDPE pipe provides a practical solution for floating sand transportation because it combines relatively low weight with flexibility and corrosion resistance.

Furthermore, the pipeline diameter matches the 6-inch pump discharge arrangement.

The 500-meter pipeline allows dredged sand slurry to move away from the working area toward the selected discharge location.

However, pipeline arrangement always affects pumping performance. Bends, elevation changes, slurry concentration, and actual operating conditions can increase resistance.

Therefore, the specified 500-meter discharge performance should be considered together with the intended soft, loose sand conditions and the supplied system configuration.

13. MDPE Floaters Keep the Pipeline on the Water

A long discharge pipeline requires reliable flotation.

Therefore, the package includes 130 MDPE floaters designed for the 6-inch pipeline.

The floaters support the approximately 500-meter pipe system on the water surface.

Without sufficient flotation, sections of pipeline could sink or create undesirable loading on connections.

Furthermore, a properly supported pipeline is easier to arrange and inspect.

The floating configuration also allows the discharge line to follow the general movement of the water surface.

Consequently, pipeline floaters form an important part of the complete dredging system rather than an optional cosmetic accessory.

14. How the Submersible Pump Dredger Works

The complete dredging process follows a relatively straightforward sequence.

First, operators position the floating dredger in the selected working area and secure it using the anchors and ropes.

Next, the diesel generator provides electricity to the system.

Then, the electric hoist lowers the ZJQ150-22-22 pump toward the underwater sand deposit.

Meanwhile, the high-pressure water pump helps disturb the loose sand around the working area.

As the sand mixes with water, the submersible pump draws the slurry directly into its inlet.

Next, the impeller transfers energy to the mixture and pushes it through the 6-inch discharge system.

The slurry first travels through the wear-resistant rubber hose. Afterward, it enters the floating HDPE pipeline.

Finally, the pipeline carries the sand-water mixture toward the designated discharge area up to the specified 500-meter distance.

As one area becomes depleted, operators can raise or reposition the pump and adjust the floating platform.

Therefore, dredging can progress systematically across the deposit.

15. Suitable Material for This Submersible Pump Dredger

Understanding material conditions is particularly important for this machine.

The specified suitable material is:

Soft, loose sand material.

This means the dredger works best where the sediment can be disturbed and mixed with water relatively easily.

For example, loose river sand represents a much more suitable condition than extremely hard clay.

Likewise, a sand bed containing occasional particles within the pump’s passage capability differs greatly from a deposit dominated by coarse gravel or stones.

Therefore, customers should avoid selecting dredging equipment based only on dredging depth and production.

Material characteristics should always form part of the selection process.

If the site contains compact clay, large stones, substantial fibrous debris, or other difficult materials, a different dredging method may be required.

Consequently, providing photos, sediment information, or project videos before quotation can help avoid incorrect equipment selection.

16. Submersible Pump Dredger for River Sand Extraction

River sand extraction is one of the primary applications for this submersible pump dredger.

In suitable river conditions, loose sand deposits can accumulate at depths where conventional small suction dredgers become less practical.

The underwater pump arrangement provides a useful advantage because the pump can descend toward the sand bed.

Moreover, the 20-meter dredging depth gives operators access to relatively deep deposits while maintaining a compact floating platform.

The high-pressure water pump helps mobilize the sand, while the main pump transfers the slurry toward shore or another collection area.

Consequently, the system can provide approximately 40–45 m³/h of sand output under the specified working conditions.

17. Lake and Pond Desilting

The same equipment concept can also support suitable lake and pond projects.

Over time, sand and sediment may accumulate on the bottom and reduce useful water depth.

Therefore, dredging can help restore capacity or remove unwanted deposits.

A compact floating submersible pump dredger can reach selected areas without requiring the dimensions and complexity of a large cutter suction dredger.

Furthermore, the anchoring system allows operators to work section by section.

However, the material must remain compatible with the pump.

Soft and loose sediment provides the most suitable condition for this configuration.

18. Sand Recovery for Construction Use

Where local regulations and project conditions allow sand extraction, the dredger can recover suitable underwater sand for further processing or construction-related use.

The 40–45 m³/h specified sand output provides a practical production level for a compact system.

Furthermore, the 500-meter pipeline gives contractors flexibility when choosing the discharge location.

For example, the slurry can travel toward a designated settling or collection area away from the floating dredger.

After water separates from the solids, the recovered sand can undergo any required processing according to the project.

Therefore, the dredger can form the first stage of a broader sand handling system.

19. Advantages of a Compact Submersible Pump Dredger

This particular submersible pump dredger combines several practical advantages.

Deeper Underwater Operation

The pump works directly underwater and supports a dredging depth within 20 meters.

Realistic Sand Production

The specified actual sand output reaches approximately 40–45 m³/h under suitable conditions.

500-Meter Discharge System

The package includes the HDPE pipeline and floaters needed for the specified transport distance.

Independent Diesel Power

A 50 kW soundproof diesel generator supplies electricity where shore power is unavailable.

Frequency Conversion Control

The 37 kW control box provides variable-frequency operation for the main pump.

High-Pressure Water Assistance

A 5.5 kW water pump helps disturb loose sand around the suction area.

Electric Pump Lifting

The electric hoist makes depth adjustment and pump retrieval more convenient.

Compact Floating Structure

Two 4-meter side pontoons provide the foundation for the complete dredging system.

Together, these components create a relatively self-contained dredging package.

20. Why a Complete Dredging System Matters

Buying only a submersible pump does not automatically create an efficient dredging operation.

The pump needs power, control, lifting, positioning, discharge piping, flotation, and suitable material feeding.

Therefore, the value of the submersible pump dredger lies partly in system integration.

For this configuration, the main pump works together with the high-pressure water pump. Meanwhile, the generator supplies power and the frequency converter manages pump operation.

The portal frame and electric hoist control pump depth. Likewise, anchors control platform position.

Finally, the rubber hose, HDPE pipeline, and MDPE floaters complete the material transport route.

Consequently, each component performs a different function, but all components contribute to the same production objective.

This system approach also makes troubleshooting easier because engineers can evaluate how the individual components interact.

21. How to Select the Right Submersible Pump Dredger

Before choosing a submersible pump dredger, customers should provide several important pieces of project information.

First, explain the material.

Is it fine sand, coarse sand, silt, mud, gravel, or mixed sediment?

Next, provide the required dredging depth.

Although this configuration reaches within 20 meters, other projects may require different equipment.

Then, specify the expected production.

Furthermore, the required discharge distance must be confirmed. A 100-meter project creates very different pipeline resistance from a 500-meter project.

Elevation also matters. Therefore, customers should mention whether the discharge point is approximately level with the water surface or significantly higher.

Other useful information includes:

• Maximum particle size
• Water depth
• Sand-bed condition
• Desired pipeline diameter
• Available power
• Water conditions
• Project photos or videos

With this information, engineers can determine whether the standard configuration fits the application or whether customization is necessary.

22. Maintenance for Reliable Long-Term Operation

Regular maintenance helps the submersible pump dredger maintain reliable performance.

Because sand is abrasive, operators should inspect the pump’s wet-end components periodically.

Furthermore, cables and electrical connections should receive regular attention because the main pump operates underwater.

The electric hoist, steel wire, anchors, and ropes also require inspection.

Meanwhile, the diesel generator needs routine engine maintenance according to its operating schedule.

Pipeline connections should remain secure, while rubber hoses should be checked for excessive wear.

Moreover, operators should inspect the MDPE floaters and confirm that the pipeline remains properly supported.

Preventive inspection usually costs far less than an unexpected shutdown.

Therefore, establishing a routine maintenance schedule from the beginning can improve equipment availability throughout the project.

23. Why Choose OCEAN Pump?

OCEAN Pump provides pumps, dredging equipment, floating systems, and project-based slurry transportation solutions.

Our equipment range includes:

• Submersible pump dredgers
• Submersible sand pumps
• Submersible slurry pumps
• Hydraulic slurry pumps
• Gravel pumps
• Heavy-duty slurry pumps
• Portable sand dredgers
• Jet suction dredgers
• Cutter suction dredgers
• HDPE pipelines
• Pipeline floaters
• Floating pontoons and dredging accessories

Rather than selecting equipment only according to pump diameter, we consider actual project requirements such as material type, dredging depth, discharge distance, production target, and pipeline conditions.

Furthermore, customized configurations can be developed when standard equipment does not completely match the working environment.

Technical support can also cover equipment selection, installation guidance, operating recommendations, maintenance, troubleshooting, and spare-parts requirements.

As a result, customers can develop a dredging system around real site conditions rather than relying on a generic machine configuration.

24. Frequently Asked Questions

What is the dredging depth of this submersible pump dredger?

The specified dredging depth is within 20 meters under suitable working conditions.

What is the actual sand output?

The specified sand production is approximately 40–45 m³/h when working with suitable soft and loose sand.

Why is pump flow 150 m³/h but sand output only 40–45 m³/h?

The 150 m³/h figure represents total slurry flow, which includes both water and solids. Actual sand output represents the approximate volume of recovered sand. Therefore, the two figures describe different performance measurements.

How far can this dredger discharge the slurry?

The specified system includes 500 meters of 6-inch HDPE pipeline and is designed around a 500-meter discharge distance under the stated working conditions.

What pump does the dredger use?

It uses the ZJQ150-22-22 submersible sand pump, with 150 m³/h rated flow, 22 m head, 980 rpm speed, 22 kW motor power, and a 6-inch outlet.

What is the maximum particle size?

The specified maximum allowed particle diameter is 32 mm.

Does the dredger require external electricity?

The package includes a 50 kW diesel generator with a soundproof box, so the dredger can provide its own electrical power.

How is the pump lowered underwater?

An electric hoist with motor and steel wire raises and lowers the submersible pump through the portal-frame arrangement.

Does the package include discharge pipes?

Yes. It includes 44 pieces of 6-inch HDPE pipe at 11.5 meters per piece, providing approximately 500 meters in total. It also includes 130 MDPE floaters.

What material is suitable?

The specified suitable working material is soft and loose sand.

Can the dredger be customized?

Yes. Configuration should be discussed according to dredging depth, material characteristics, required production, discharge distance, and project environment.

Conclusion: Practical Submersible Pump Dredger for Sand Projects

The submersible pump dredger provides a compact and integrated solution for projects that need to extract soft, loose sand from underwater deposits and transport the resulting slurry over a substantial distance.

At the center of this system is the ZJQ150-22-22 submersible sand pump, which provides a rated flow of 150 m³/h, a head of 22 meters, a 6-inch discharge outlet, and a 22 kW motor. Moreover, the pump can pass particles up to 32 mm and operates at 980 rpm. Under the specified working conditions, the complete dredger provides approximately 40–45 m³/h of sand output.

The underwater pump arrangement also allows the machine to work at a dredging depth within 20 meters. Therefore, it offers an important advantage for suitable projects where deeper sand deposits need to be reached without relying on a long conventional suction line.

However, the pump represents only one part of the complete solution. A 5.5 kW high-pressure water pump helps disturb loose sand and improve material feeding. Meanwhile, the 37 kW frequency-conversion control box manages the main pump, and the 50 kW soundproof diesel generator provides independent power.

Furthermore, the electric hoist and 2.2-meter portal frame allow operators to raise and lower the pump. Three anchors and 200 meters of anticorrosion rope support dredger positioning. In addition, two 10-meter sections of 6-inch wear-resistant rubber hose connect the dredger to the discharge system.

The pipeline package is equally important. Forty-four sections of 6-inch HDPE pipe provide approximately 500 meters of discharge pipeline, while 130 MDPE floaters support the pipeline on the water surface. Consequently, the dredger arrives as a coordinated system for sand extraction, pump control, power generation, positioning, and slurry transportation.

Nevertheless, every dredging project has different conditions. Sand hardness, particle size, water depth, pipeline layout, elevation, and required production can all influence equipment performance. Therefore, correct selection should begin with an accurate understanding of the project.

For suitable river sand extraction, lake dredging, pond desilting, and underwater sand recovery applications, this submersible pump dredger combines relatively deep operation, practical sand production, independent diesel-generated power, and a complete 500-meter floating pipeline in one compact dredging system.

Ultimately, productive dredging depends on how well every component works together. The pump must match the material, the generator must support the electrical system, the hoist must control underwater positioning, and the pipeline must transport the slurry reliably. When these elements match the actual working conditions, the submersible pump dredger can provide a straightforward, efficient, and practical solution for continuous sand dredging operations.