Submersible Dredge Pump: As an indispensable engineering equipment, the submersible dredge pump plays a significant role in various fields such as mining, water conservancy, ports, and underwater projects. It is widely used to remove sediments and solid particles from bodies of water, ensuring unobstructed waterways and water cleanliness. Therefore, accurately determining the required size of the submersible dredge pump is crucial during project implementation. Engineers and project managers need to have a deep understanding of how to scientifically and reasonably determine the pump size to ensure efficient operation and reliability of the project. This article aims to explore in-depth the functionality and importance of the submersible dredge pump, and provide a set of practical guidelines to assist in determining the appropriate pump size. Additionally, at the end of this article, the relevant parameter table from OCEAN Pump Company will be provided, aiming to offer customers a more convenient reference for selecting the most suitable model of submersible dredge pump.

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1. What is Submersible Dredge Pump?

1.1 What Is the Working Principle of a Submersible Dredge Pump?

The submersible dredge pump is a powerful pump specifically designed for pumping slurry or sludge containing solid particles. It has a wide range of applications in industries such as mining, metals, waste, and recycling, and can handle abrasive liquids and slurries. The submersible dredge pumps produced by OCEAN Pump feature a robust design and use special materials that are more durable than standard submersible pumps, enabling them to operate efficiently in harsh working environments.

The working principle of the submersible dredge pump is based on centrifugal force and the rotation of the impeller. The pump body is designed to be fully submerged in the pumped liquid, eliminating the need for external priming. It typically consists of a motor and a pump body, with the pump body made of wear-resistant and corrosion-resistant materials to withstand the abrasion and chemical attack of the slurry’s solid particles.

During pump startup, the motor or engine drives the pump shaft, which in turn drives the impeller to rotate. The rotation of the impeller generates centrifugal force, causing the liquid to be drawn into the pump body and rapidly expelled by the centrifugal force. OCEAN Pump submersible dredge pumps have a large particle handling capacity. When the slurry enters the pump body, the solid particles collide and rub against the rotating impeller and vanes, causing them to be crushed and suspended in the liquid. Through the action of centrifugal force, the slurry is pushed to the outlet of the pump body. The outlet is typically connected to a pipeline system that transports the slurry to the desired location. The pipeline system can be designed according to specific application requirements to ensure smooth flow of the slurry to the target location.

OCEAN Pump submersible dredge pumps are usually equipped with control and protection devices to monitor the pump’s operating status and protect it from damage due to overload, overheating, and other abnormal conditions. These devices provide real-time monitoring and alarm functions, ensuring the safe operation of the pump and timely implementation of necessary maintenance measures. Due to their robust design and the use of wear-resistant and corrosion-resistant materials, submersible dredge pumps can withstand harsh working conditions in the mining, metals, waste, and recycling industries. They are capable of effectively pumping abrasive liquids and slurries such as ores, coal gangue, and waste residues. The durability and efficiency of these pumps make them indispensable equipment in these industries.

1.2 What Are the Main Parameters of the Submersible Dredge Pump?

(Submersible Dredge Pump) is an efficient pump specifically designed for handling solid particles and slurry. When selecting this type of pump, multiple operational parameters must be considered in order to ensure that the chosen pump model meets the requirements of the specific application and achieves optimal performance. The following are several important parameters:

1.2.1 Flow Rate of the Submersible Dredge Pump

Flow rate is a critical parameter that measures the volume of liquid or slurry passing through the pump per unit of time. It is typically measured in cubic meters per hour (m³/h) or gallons per minute (GPM). This parameter directly determines the amount of material the pump can handle per hour and is of significant importance in evaluating the pump’s operational efficiency.

In the application scenarios of submersible dredge pumps, the material extracted often has a high concentration due to direct contact with the slurry at the suction inlet. In some cases, the concentration can reach levels as high as 50-60%. Recognizing this characteristic, the OCEAN Pump technical team is dedicated to providing customers with professional flushing devices and agitation devices to achieve higher operational efficiency under the same mixing flow conditions, ensuring stable pump operation and optimal performance.

1.2.2 Head of the Submersible Dredge Pump

Head, as a key performance parameter of a pump, refers to the vertical or horizontal distance that the pump can effectively overcome. It accurately reflects the maximum height to which the pump can lift the slurry or solid particles or the farthest distance to which it can push them. This parameter is typically measured in meters (m) or feet (ft), which are internationally recognized units of measurement.

When selecting the appropriate head, several key factors must be taken into consideration. First is the distance of conveyance, which refers to the specific distance to which the pump needs to push the fluid or particulate matter. Second is the elevation, which relates to whether the pump can lift the material to the desired vertical position. Lastly, there is the consideration of pipeline losses, which refers to the energy losses due to factors such as friction and bends when the fluid flows through the pipeline.

OCEAN Pump has an advanced and professional calculation program that can accurately calculate pipeline losses and head parameters. This ensures that customers can obtain precise and reliable data support when selecting a pump, further guaranteeing the pump’s performance in actual operation.

1.2.3 Efficiency of the Submersible Dredge Pump

Efficiency of a pump refers to its ability to convert input power into output power effectively. For submersible dredge pumps, this efficiency is usually quantified in percentage. A high-efficiency submersible dredge pump utilizes energy more effectively, enabling efficient pumping of solid particles and slurry with lower energy consumption. Compared to horizontal slurry pumps, submersible dredge pumps generally exhibit higher efficiency levels. This is mainly due to their submerged operation, where the pump’s inlet directly contacts the slurry, eliminating cavitation allowances and related energy losses. Under ideal working conditions, the efficiency of a submersible dredge pump can reach high levels ranging from 80% to 90%

1.2.4 Solids Particle Size of the Submersible Dredge Pump

As a specific type of industrial equipment, submersible dredge pumps have the ability to handle solid particles within a certain range. This capability is directly related to the overall design and functional performance of the pump. In the specifications of the pump, the maximum allowable size of solids particles is usually explicitly stated to ensure stability and reliability in practical applications.

Traditional submersible dredge pumps have relatively smaller particle sizes, typically limited to around 20mm. This is because traditional pump models are mainly used for conveying fine sand or slag-like small particle materials, and their impeller designs often employ closed structures to accommodate such materials’ characteristics.

However, with technological advancements and the continuous expansion of industrial fields, the application range of submersible dredge pumps has gradually expanded to various areas such as water conservancy, ports, and underwater engineering. These new application scenarios impose new requirements on the pump’s passage diameter to accommodate the transport of materials with different particle sizes.

In response to this market demand, OCEAN Pump has undertaken bold innovations and improvements. We have designed submersible dredge pumps with semi-open impeller structures. This design ensures the pump’s flow rate and head while effectively accommodating larger-sized particles. Most pumps utilizing this design can successfully pass particles up to 60mm, significantly expanding the pump’s range and adaptability.

To further meet the specific needs of some customers, we have successfully combined the pump casing of a gravel pump with the motor of a submersible dredge pump, resulting in a groundbreaking submersible dredge pump capable of passing particles up to 127mm. This innovative achievement not only showcases OCEAN Pump’s strength in technological research and development but also provides strong support for the broader application of submersible dredge pumps.

1.2.5 Submersion Depth of the Submersible Dredge Pump

Submersible dredge pumps have the capability to operate fully or partially submerged in liquid or slurry. The submersion depth of the pump depends on the specific project requirements and the design characteristics of the pump body. When selecting a submersible dredge pump, it is essential to ensure that it can operate stably within the specified submersion depth range.

Currently, the standard submersible dredge pumps produced by OCEAN Pump are equipped with a cable length of 10 meters, which ensures normal operation within a depth range of 5 to 8 meters. If the operating environment requires a deeper submersion depth, it can be achieved by appropriately extending the cable length.

Given that the operating environment of submersible dredge pumps is mainly below the water surface, they have significant advantages in terms of extraction depth. In OCEAN Pump’s past service cases, we have provided submersible dredge pumps suitable for extracting at a depth of 120 meters for clients in the Philippines, and we received high recognition and praise from the customers.

2.What is the Application of Submersible Dredge Pump?

2.1 Dredging and Excavation

Submersible dredge pumps are extensively used for dredging and excavation purposes in rivers, lakes, ports, and other bodies of water. They are employed to remove sediment, silt, soil, and other debris from waterbeds, ensuring navigable channels, deepening waterways, and creating or restoring ports.

2.2 Mining and Ore Processing

In the mining industry, submersible dredge pumps play a crucial role in extracting minerals and ores from underwater sediments. They are used to pump slurry and solids-laden water from mining pits, tailings ponds, and other mining operations.

2.3 Sand and Gravel Extraction

Submersible dredge pumps are utilized in sand and gravel extraction projects, such as beach nourishment, land reclamation, and construction activities. They effectively pump sand, gravel, and other coarse materials.

2.4 Offshore Oil and Gas

Submersible dredge pumps are employed in offshore oil and gas operations for seabed preparation, pipeline installation, and maintenance activities. They assist in clearing seabed sediments, drilling mud, and debris to ensure smooth operations.

2.5 Environmental Remediation

Submersible dredge pumps are used in environmental remediation projects to clean polluted water bodies, remove contaminants, and restore ecological balance. They effectively remove sludge, sediments, and hazardous substances from lakes, ponds, and industrial sites.

2.6 Flood Control and Disaster Management

During flood events or natural disasters, submersible dredge pumps are deployed to manage water levels, prevent flooding, and clear excess water from affected areas. They can rapidly extract large volumes of water and debris to mitigate flood risks.

2.7 Agriculture and Irrigation

Submersible dredge pumps are applied in agricultural irrigation systems, particularly in areas prone to waterlogging or excessive sedimentation. They aid in draining flooded fields, clearing sediment from irrigation channels, and promoting efficient water distribution.

3.What types of  Submersible Dredge Pump?

3.1 Bottom Agitator Submersible Dredge Pump

This type of submersible dredge pump is equipped with an agitator, typically designed in the form of an agitating impeller or a cutting mechanism. The primary function of the agitator is to break and suspend sediments, enabling efficient pumping of high-solids content slurries.

3.2 Side Agitator submersible dredge pump

The side Agitator dredge pump is designed to cut and suction various materials from the seabed or riverbed depths. The side Agitator submersible dredge pump offered by OCEAN Pump is typically equipped with 2 to 3 side-mounted agitators. Each agitator is fitted with sharp rotating blades beneath it, enabling efficient cutting and crushing of compacted soils or sediments. Subsequently, these crushed materials are forcefully drawn into the pump body and discharged through a specific conveying system. The power configuration of the side-mounted agitators is usually coordinated with the actual power of the main pump, typically ranging from 5.5 kW to 22 kW, to ensure stable operation and efficient performance of the entire system.

3.3 Excavator submersible dredge pump

The excavator dredge pump is a highly efficient equipment specifically customized for excavators and other hydraulic machinery. This pump relies on the stable hydraulic power provided by the excavator for operation. Its wide applicability and powerful performance enable it to excel in various dredging operations. When customers purchase this type of hydraulic submersible dredge pump, specific model information of the excavator is requested to ensure equipment compatibility and efficient operation. We have accumulated rich experience and maintain sufficient stock to meet the diverse needs of customers, particularly for commonly seen excavator models such as 20-ton, 30-ton, and 40-ton excavators.

3.4 Jet submersible dredge pump

The jet dredge pump utilizes advanced high-pressure water jetting technology to effectively fluidize and transport sediments. This type of pump is typically suitable for operating environments where the soil or sediments are loose and sandy. The working principle involves using the force of high-pressure water jets to effectively entrain and transport sediments to the desired location, enabling efficient and precise excavation operations.

In terms of selecting a high-pressure water pump, OCEAN Pump is committed to meeting diverse customer needs. We provide two main options for high-pressure water pumps: first, the IS series horizontal high-pressure water pump, which offers stable performance and smooth operation; second, the submersible high-pressure water pump, which is user-friendly and highly adaptable. Customers can choose the most suitable high-pressure water pump solution based on their specific operating environment, requirements, and budget considerations to achieve optimal operational effectiveness and cost efficiency.

3.5 Combination Submersible Dredge Pump

The combination submersible slurry pump offered by OCEAN Pump integrates side-mounted agitators and a bottom flushing device, resulting in a more comprehensive functionality and higher operational efficiency. This combination design is typically used in conjunction with the design of production floating platforms to ensure optimal performance. As a company specializing in providing comprehensive solutions and services, OCEAN Pump not only supplies products but is also committed to offering holistic solutions for customers. In relation to this complete solution, OCEAN Pump’s excellent sales representative, Lingda Kong (WhatsApp: +86 185 6229 3317), is capable of tailoring a complete system solution based on a thorough understanding of the customer’s working conditions, meeting their specific requirements.

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4.How to Choose the Size of Submersible Dredge Pump?

4.1 Determining Project Parameters of Submersible Dredge Pump

Firstly, we need to gather comprehensive information on the key parameters required for the project. Among them, the type of slurry is crucial, and it is necessary to specify whether it is sediment, slurry, wastewater, or other types. Furthermore, the flow rate requirement of the slurry should not be overlooked. We can provide both the required mixed flow rate data and the desired solids content data.

Secondly, we must accurately determine the horizontal distance, vertical distance, and extraction depth for slurry transport. These data are essential for subsequent calculations and planning.

Lastly, we also need to understand relevant information about the solid particles in the extracted medium to have a more comprehensive understanding of the project’s specific circumstances.

During the process of collecting these parameters, we must ensure the accuracy and precision of the data to provide a solid foundation for subsequent calculations and decision-making.

4.2 Obtaining Performance Curves of Submersible Dredge Pump

Performance curves are graphical representations that showcase the characteristics of a pump, primarily the relationship between flow rate and head. If you need to obtain relevant product documentation or laboratory test data, you can contact Lingda Kong, the sales representative of OCEAN Pump, at WhatsApp: +86 185 6229 3317 or email for assistance. OCEAN Pump is equipped with a complete set of professional pump performance testing systems, aiming to ensure that each pump undergoes rigorous testing before leaving the factory, and provides detailed performance curve graphs and certificates of factory acceptance. This ensures that the selected curve aligns with the required pump type and operating conditions, guaranteeing optimal performance.

4.3 Determining Flow Rate of Submersible Dredge Pump

Based on the specified flow rate requirements of the project, it is essential to locate the corresponding flow rate data point accurately on the performance curve graph. In the representation of performance curves, flow rate is typically measured as the volume passing through the pump body per unit of time. Common units of measurement include cubic meters per hour (m³/h) or gallons per minute (GPM). If you can provide a specific numerical value for the desired sand production rate, OCEAN Pump’s professional technical personnel can estimate the corresponding mixed flow rate based on this information.

4.4 Determining Head of Submersible Dredge Pump

Based on the specified pump head requirements of the project, it is necessary to provide key parameters such as the horizontal distance, vertical distance, and extraction depth for slurry transport. Subsequently, OCEAN Pump’s professional technical personnel will utilize specialized software to accurately calculate the required head and precisely locate the corresponding head point on the performance curve. This ensures the efficient and stable operation of the pumping system.

4.5 Verification of Compatibility of Submersible Dredge Pump

After selecting the flow rate and head values, it is important to ensure that they closely align with the matching points on the performance curve. This step is taken to verify whether the selected flow rate and head values indeed exist on the curve, ensuring that the pump can reliably deliver the expected performance in the designated operating conditions. Subsequently, OCEAN Pump’s technical team will accurately calculate the pump’s shaft power based on parameters such as flow rate, head, discharge distance, and efficiency. Using this information, the required power range can be inferred. We are committed to recommending pump models with sufficient margin to ensure efficient and stable operation in practical applications.

5. Parameter Table of Submersible Dredge Pump

The submersible dredge pump by OCEAN Pump stands out in the mineral, metal, waste, and recycling industries due to its robust design and the use of materials that are more durable than standard submersibles. It is specifically selected for pumping abrasive liquids and slurries.

Please check the submersible dredge pump parameter table for reference

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We hope this guide has addressed some of the questions you may have had about pump sizing. However, if you have any uncertainties or specific inquiries, please submit your questions via the chatbox in the upper right corner or call +86 18562293317 to obtain parameter and sizing recommendations for the submersible dredge pump tailored to your specific industrial application. We look forward to assisting you further.