1.What is a Submersible Dredge Pump?

A submersible dredge pump is a specialized pump designed for the transportation of media such as slurry, mud, and other viscous substances containing a significant amount of solid particles. It utilizes a submersible motor with excellent water tightness and strong corrosion resistance as its power source, while its compact pump body allows for direct placement on the surface of the medium or operation underwater.

Submersible dredge pump impeller

Compared to conventional dredge pumps, submersible dredge pumps offer numerous distinct advantages. They can operate directly submerged in liquid without the need for external suction, making them particularly suitable for deepwater environments. Specifically designed to handle viscous media containing solid particles such as slurry, sand, and mud, these pumps exhibit excellent wear resistance and conveying capacity. The implementation of a sealing system ensures that the medium does not leak into the motor, thereby enhancing operational reliability. Furthermore, their compact structure and small footprint make them easily installable and movable, ideal for operations in confined spaces. Maintenance and upkeep requirements are relatively simple, resulting in lower operational costs. To summarize, submersible dredge pumps, with their unique design and performance characteristics, provide efficient and reliable solutions for solid particle handling and slurry transport.

2. Application Scenarios of Submersible Dredge Pumps

2.1 Mining Operations

Submersible dredge pumps are widely used in mining operations to suction and transport slurry containing sand, rocks, and other solid particles generated during the extraction process. They can operate efficiently and reliably in harsh underwater environments, providing a dependable solution for slurry discharge in mining production.

2.2 Dredging of Water Bodies

Submersible dredge pumps play a crucial role in the cleaning of sediment in reservoirs, lakes, and other water bodies. They can directly submerge into the water, suctioning up the mud, silt, and other sediments accumulated at the bottom, and transporting them to designated treatment areas. This helps improve the water quality and ecological environment of the water bodies.

2.3 Groundwater Drainage in Construction Sites

In large construction sites, continuous pumping of groundwater is necessary to ensure a dry working environment. The submersible dredge pump is well-suited for such dewatering operations due to its capability to operate directly in water heavily laden with sediments.

2.4 Wastewater Treatment

In sedimentation tanks, storage tanks, and other stages of wastewater treatment plants, submersible dredge pumps can be used to suction and transport wastewater containing sludge and sediment, providing support for subsequent wastewater treatment. They possess excellent corrosion resistance, making them suitable for challenging wastewater environments.

2.5 Dredging Projects

During dredging operations in rivers, ports, and other water areas, submersible dredge pumps can be used to suction and transport the mud, silt, and sediments scraped from the bottom, providing robust support for dredging projects.

3. Different Types of Submersible Dredge Pumps

3.1 Classification by Power Source

3.1.1 Electric Motor Driven Submersible Dredge Pump

This type utilizes a submersible electric motor as the power source, directly mounted on the pump body. It offers advantages such as compact structure and reliable operation. This is the most widely used type.

3.1.2 Hydraulic Driven Submersible Dredge Pump

This type uses a hydraulic motor as the power source and operates the pump through an external hydraulic system. It is suitable for harsh environments, such as high temperature and highly corrosive conditions.

3.2 Classification by Structure

3.2.1 Submersible Dredge Pump With Agitator

This type integrates a mixing device within the pump body, effectively preventing slurry sedimentation and improving transportation stability. It is suitable for transporting high concentration and high viscosity slurries.

3.2.2 Submersible Dredge Pump Without Agitator

This type has a simpler and more compact structure, suitable for transporting lower concentration and well-flowing slurries.

3.3 Classification by Slurry Type

3.3.1 Submersible Sand Dredge Pump

Specifically designed for transporting slurry containing a large amount of sand and rock particles, with excellent abrasion resistance.

3.3.2 Submersible Slurry Dredge Pump

Suitable for transporting sludge, silt, and other slurries containing finer particles.

3.3.3 Submersible Large Particle Dredge Pump

Capable of transporting large solid particles with a diameter of over 100mm, commonly used in mining operations and similar fields.

3.4 Classification by Material

3.4.1 High Chromium Alloy Submersible Dredge Pump

Manufactured using high chromium alloy material, it exhibits outstanding wear resistance and is suitable for transporting media with hard particles.

3.4.2 Stainless Steel Submersible Dredge Pump

Made from high-quality stainless steel, it possesses superior corrosion resistance, making it suitable for transporting highly corrosive slurries.

Submersible dredge pump impeller
Submersible dredge pump impeller
Submersible dredge pump impeller
ZJQ 300-20-37 (3)

4. Disadvantages of Submersible Dredge Pumps

4.1 Limited Pumping Capacity

Due to the size and power limitations of conventional submersible slurry pumps, their conveying capacity is generally low, making it difficult to meet the demanding requirements of large-scale sand and mud dredging. Especially in applications such as large-scale mining or extensive dredging projects, there is a critical need for pumps with higher flow rates to meet operational requirements.

To address this issue, the design team at OCEAN Pump conducted in-depth research and developed a meticulously engineered semi-open impeller structure. This design not only significantly increases the pump’s flow rate but also ensures stable head performance, thus meeting the practical demands of engineering projects.

4.2 Susceptible to Clogging, Requires Regular Maintenance and Cleaning

During the transportation of slurry containing sediment, impurities, and other materials, traditional submersible slurry pumps often experience frequent pipeline clogging due to the design of closed impellers. This closed impeller structure imposes limitations on the flow rate, significantly reducing conveying efficiency and necessitating frequent shutdowns for inspection and cleaning, thereby increasing operational costs. To overcome this problem, the design team at OCEAN Pump developed a semi-open impeller that can handle a maximum concentration of up to 60%, effectively resolving flow limitations and pipeline clogging associated with traditional impellers.

4.3 Poor Wear Resistance, Shorter Lifespan

The hard particles present in slurry cause severe wear and tear on the pump body and pipelines, leading to a significantly shorter equipment lifespan. Traditional submersible slurry pumps often struggle to meet the practical application requirements in terms of wear resistance. Currently, OCEAN Pump’s flow components, such as the pump casing, impeller, and suction plate, are manufactured using high-chromium alloy material known as Cr26. This material’s excellent corrosion resistance and wear resistance have gained widespread recognition and favor among customers.

4.4 Incapable of Handling Slurries with Large Solid Particles

In certain operating conditions, rough slurries containing large particles are generated. Conventional submersible slurry pumps face challenges such as blockages and damage when transporting such slurries. In response, the design team at OCEAN Pump conducted extensive research and development, successfully designing a semi-open impeller that combines the advantages of gravel pumps and submersible slurry pumps. The semi-open impeller has a maximum passage size of up to 127mm, aiming to fundamentally solve the issues of flow limitations and pipeline blockages caused by traditional impellers, thereby achieving efficient handling of slurries with large solid particles.

4.5 Unsuitable for High Head Applications

Submersible slurry pumps often face limitations in achieving high heads due to power and structural constraints. Therefore, their suitability is restricted in specific scenarios that require long-distance or high vertical conveying. To address this issue, the design team at OCEAN Pump re-engineered the outer diameter and blade shape of the impeller based on the semi-open impeller design. Through precise computer program calculations and optimization, the pump’s performance has been improved, making it suitable for higher power input. Numerous successful cases have validated this design, as it not only enables high-flow transport but also achieves higher heads.

5. Conclusion

OCEAN Pump has shown significant advantages in addressing the drawbacks of conventional submersible dredge pumps. Firstly, it features a high-flow design with a conveying capacity of up to 1000m³/h, meeting the demands for large-scale sand and mud dredging and overcoming the limitations of conventional pumps. Secondly, OCEAN Pump employs unique flow channel design and anti-clogging technology, ensuring stable and efficient operation even when handling high-concentration and high-viscosity slurry, greatly improving its anti-clogging performance.

Additionally, OCEAN Pump utilizes high-wear-resistant materials to manufacture key components, significantly enhancing the equipment’s resistance to wear and enabling stable operation in harsh environments containing hard particles. Moreover, it has powerful particle-handling capabilities, capable of transporting large particles with a diameter of up to 127mm, addressing the limitations of conventional pumps in handling rough slurries.

It’s worth mentioning that OCEAN Pump adopts advanced hydraulic design, providing a maximum head of up to 100 meters, meeting the requirements for long-distance or high vertical conveying applications and overcoming the limitations of conventional submersible dredge pumps in high head conditions.

Overall, OCEAN Pump offers users a more reliable and efficient solution for slurry transportation with its outstanding flow conveying capacity, excellent anti-clogging performance, superior wear resistance, powerful particle-handling capabilities, and suitability for high head applications. It has demonstrated remarkable performance in various demanding industrial environments.