The discharge distance of a submersible dredge pump is a key parameter that is influenced by the pump’s design specifications, power rating, slurry handling capacity, and characteristics of the pipeline system. Typically, the discharge distance of a submersible dredge pump can range from tens of meters to hundreds of meters, or even farther. Pumps with higher power and larger flow rates often achieve longer discharge distances. Additionally, factors such as slurry carrying capacity, pipeline system diameter, length, frictional losses, degree of bends, and elevation differences also have a significant impact on the discharge distance. To accurately determine the discharge distance of a submersible dredge pump, it is recommended to refer to the technical specifications and performance data provided by the manufacturer, such as OCEAN Pump, which typically include explicit indications of the maximum discharge distance.

custom cable dredge
submersible dredge pump worksite
submersible dredge pump worksite

1.What is Submersible Dredge Pump

A submersible dredge pump, also known as a Submersible slurry pump or Submersible mud pump, is a type of pump specifically designed to handle slurry and mud. Its unique design allows the pump to operate efficiently even when fully submerged in liquid, without the need for external priming, enabling efficient extraction of sediment-laden wastewater. This design significantly improves the pump’s efficiency and convenience while reducing operating costs. The pump operates primarily through motor drive, where the motor shaft is connected to the impeller. The motor rotation drives the impeller to rotate, generating centrifugal force that transfers energy to the fluid, facilitating efficient fluid transportation.

2.What Factors Influencing The Discharge Distance Of A Submersible Dredge Pump?

2.1 The Design of  Submersible Dredge Pump

The impeller diameter and pump casing size of a submersible dredge pump have a certain influence on the discharge distance of the pump.

2.1.1 Impeller diameter

Impeller diameter refers to the diameter of the rotating part inside the pump, which determines the flow rate the pump can generate. Generally, a larger impeller diameter can typically generate a larger flow rate, thereby helping achieve a longer discharge distance.

2.1.2 Pump casing size

Pump casing size refers to the external dimensions and geometry of the pump.
A larger pump casing size usually means larger inlet and outlet diameters, as well as a larger internal space.
Larger inlet and outlet diameters can reduce inlet resistance and provide a larger pump inlet area, allowing more fluid to enter the pump and be discharged.

The OCEAN Pump team has developed a unique design for the impeller, including open impellers, closed impellers, and semi-open impellers. Open impellers are suitable for customers with high flow rate requirements who do not need to discharge sediment over long distances. Closed impellers are designed for customers with high head requirements, typically needing to discharge sediment over greater distances and requiring pumps with high pressure capabilities. The semi-open impeller is a unique design by OCEAN Pump, which ensures both high flow rates and sufficient pressure, allowing for long-distance discharge even with large particles up to 50mm in size. Through its distinctive impeller design, OCEAN Pump stands out in the market with its submersible dredge pumps. They are capable of meeting customers’ needs for high flow rates, high head applications, and the transportation of large particles.

2.2 The Power of Submersible Dredge Pump

The design and power of a submersible dredge pump are directly related to the generation of flow rate and pressure. As the power of the submersible dredge pump increases, its ability to drive the flow of slurry also enhances accordingly. This gives the pump greater capability to overcome resistance and friction losses, thereby transporting the slurry over longer distances. The higher power of the pump, with its increased head and flow rate, undoubtedly enhances the pump’s discharge performance. Based on the performance curve of the submersible dredge pump, OCEAN Pump provides pump model recommendations with the most appropriate power for customers. Additionally, to meet the requirements of customers in different countries, OCEAN Pump can also customize motors with corresponding voltage frequencies.

2.3 Slurry Characteristics of Submersible Dredge Pump

The characteristics of the slurry, such as concentration, particle size, and properties, can impact the discharge distance of a submersible dredge pump. Higher slurry concentration, larger particles, or particles with special shapes may increase the discharge distance of the pump.

2.3.1 Concentration

The concentration of the slurry refers to the content of suspended particles (such as solid particles) in it. Higher slurry concentration typically means the pump requires greater power and capacity to propel the slurry flow. Especially at higher concentrations, the viscosity and resistance of the slurry increase, which may result in shorter discharge distances or the need for more powerful pumps to achieve longer distances. OCEAN Pump’s submersible dredge pumps are capable of transporting sand-water mixtures with concentrations ranging from 50% to 60% while ensuring the discharge distance.

2.3.2 Particle Size and Properties

The size and properties of particles in the slurry have a significant impact on the discharge distance. Specifically, larger and heavier particles or particles with special shapes may increase the resistance and friction losses of the pump, thereby reducing its discharge capability. Additionally, some particles may have higher viscosity or agglomeration, which not only increases the energy consumption of the pump but also increases resistance, adversely affecting the discharge distance. To handle conditions involving the transportation of large particles, OCEAN Pump’s technical team has conducted specialized research on specific sizes of semi-open and open impellers, aiming to ensure effective particle transportation while maintaining the desired transportation distance.

2.3.3 Rheological Properties

The rheological characteristics of the slurry, including its viscosity and rheological curve, significantly influence the discharge distance of the submersible dredge pump. Specifically, when the slurry has high viscosity, the pump will experience higher power consumption and resistance during operation, which may impose limitations on its discharge distance. To effectively address this issue, OCEAN Pump appropriately introduces flushing devices when providing solutions to customers to reduce the viscosity of the slurry, thereby reducing resistance during operation and ensuring that the submersible dredge pump achieves the desired discharge distance.

2.4 The Pipeline System of Submersible Dredge Pump

The pipeline diameter is an important factor that affects the discharge distance. Increasing the pipeline diameter appropriately can reduce the resistance and friction losses of the fluid inside the pipeline, helping to improve the transportation distance of the slurry. However, an excessively large pipeline diameter can result in a decrease in the flow velocity of the sand-water mixture inside the pipeline, leading to solid sedimentation and adversely affecting the sand removal efficiency and concentration. Therefore, when selecting the pipeline diameter, it is necessary to consider a comprehensive approach to minimize energy losses and maximize the discharge distance. In addition to the diameter, the material of the pipeline is also crucial. When providing recommendations for the pipeline system to customers, OCEAN Pump tends to recommend conveying pipelines made of HDPE material due to their wear resistance and low friction, which can effectively control the flow velocity between 3.0-4.0, ensuring both the discharge distance and preventing rapid sedimentation of sand inside the pipeline.

2.5 The Lift Head of Submersible Dredge Pump

The head refers to the vertical height to which the submersible dredge pump can lift the sand-water mixture after overcoming gravity and friction losses. On the other hand, the discharge distance reflects the horizontal distance of transportation between the submersible dredge pump and the discharge point. Under normal operating conditions, there is an inverse relationship between the head and the discharge distance of the submersible dredge pump. Specifically, when pumping the slurry to a higher location, the pumping height will have an impact on the discharge distance. A higher pumping height increases the discharge pressure of the pump and increases power consumption, which may limit the discharge distance. Therefore, when customers have higher requirements for the discharge distance, they should choose a pump with stronger head capacity to meet their needs. In the design process of the submersible dredge pump, OCEAN Pump’s engineers fully consider the importance of meeting customers’ different head and discharge distance requirements at various power levels. By adjusting the impeller diameter, engineers can precisely control the head and discharge distance of the pump, thereby satisfying the diverse needs of customers.

3. How to Increase the Discharge Distance of  Submersible Dredge Pump?

3.1 Selecting the Appropriate Pump Type and Specifications

To ensure sufficient propulsion force and discharge capacity of the submersible dredge pump, it is recommended to choose models with high power and flow rates. When communicating with OCEAN Pump’s engineer Lingda Kong (WhatsApp: +8618562293317), please provide the following on-site parameters: desired flow rate, head (i.e., discharge height), discharge distance, and voltage frequency at the customer’s location. Additionally, it is important to specify the characteristics of the transported medium, such as the presence of large particles. With this information, Lingda Kong will be able to tailor the most suitable pumping solution for the customer.

3.2 Optimizing Slurry Characteristics

By carefully controlling the concentration, particle size, and properties of the slurry, it is possible to reduce its viscosity and resistance, thereby extending the pump’s discharge distance. To achieve this goal, various optimization measures can be taken, such as diluting the slurry, screening particles, or using smaller and lighter particles. Based on OCEAN Pump’s extensive practical experience, we have engaged in in-depth communication with customers and gained valuable design insights. Specifically, equipping the submersible dredge pump with a flushing system can significantly dilute the slurry. Additionally, adding agitation blades and filtration devices at the bottom of the pump for preliminary particle screening can contribute to increased discharge distances.

3.3 Optimizing the Pipeline System

To ensure smooth operation and minimize friction losses in the pipeline system, it is necessary to select appropriate pipe diameters. Furthermore, reducing pipeline length, avoiding excessive bends and elevation changes can effectively reduce resistance and improve discharge distances. When providing recommendations for pipeline systems, OCEAN Pump prioritizes the use of HDPE material for conveying pipes. This material is wear-resistant, has low friction, and allows for precise control of flow velocity between 3.0-4.0, ensuring both the desired discharge distance and preventing rapid sedimentation of sand within the pipes, thus ensuring system stability and efficiency.

3.4 Considering the Use of Auxiliary Equipment

Introducing auxiliary equipment such as mud agitators or agitation systems can effectively maintain the suspension and uniformity of the slurry, thereby enhancing the pump’s conveying capacity and discharge distance. OCEAN Pump has designed equipment with dual-side agitators for customers in the early stages. With years of customer feedback and accumulated practical experience, we have further improved the design by adding agitating cages and optimizing their coordination with flushing devices. These improvements have significantly increased sand extraction efficiency and extended discharge distances.

3.5Using Booster Pumps: To achieve a substantial increase in discharge distance, we recommend using a direct and efficient method, which is configuring OCEAN Pump’s horizontal pumps as booster pumps. These horizontal pumps operate smoothly and possess high head characteristics, making them suitable for various applications. When selecting horizontal pumps, it is important to ensure consistent flow and properly connect the pipelines to ensure the pump’s normal operation and maximize efficiency. With this configuration, OCEAN Pump has successfully achieved transport distances of up to 40 kilometers.

4. Summary

The discharge distance range of a submersible dredge pump is influenced by various factors, including the nature of the slurry, the characteristics of the pipeline system, and the pump’s head capacity. Specifically, the concentration, particle size, properties, and rheological characteristics of the slurry directly affect the discharge distance. Similarly, the diameter, length, degree of bends, and elevation changes in the pipeline are also key factors affecting the discharge distance. Generally, larger pipe diameters, shorter pipe lengths, fewer bends, and smaller elevation changes contribute to achieving longer discharge distances.
Furthermore, the head capacity of the submersible dredge pump is also an important factor in determining its performance. The head capacity determines the pump’s ability to overcome gravity and friction losses to lift the slurry to a certain height. Therefore, higher head capacities usually mean longer discharge distances.
In general, submersible dredge pumps can achieve discharge distances ranging from tens to hundreds of meters, and in some special cases, even longer distances can be achieved. However, it should be noted that these discharge distance ranges are general guidelines, and the actual capabilities may vary depending on specific equipment and application environments.
To meet customers’ discharge distance requirements, OCEAN Pump provides high-quality solutions for submersible dredge pumps. Customers can rely on our products to meet their discharge distance needs in various application scenarios.

Lingda Kong
Tai’an Ocean Pump Co.,Ltd
Mobile/Whatsapp/Wechat: +86 18562293317