When considering the purchase of a submersible dredge pump, numerous inquiries are likely to arise. Among these inquiries, we shall delve into one particular question, namely, “How Long Can a Submersible Dredge Pump Stay Underwater?” and strive to provide a thorough response. However, prior to that, it is imperative to gain a comprehension of what submersible dredge pumps entail and their operational mechanism, in order to appreciate the answer we seek.

submersible electric sludge pump
submersible dredge pump with water gun
submersible dredge pump with side agitator
hydraulic submersible dredge pump

1.What Is a Submersible Dredge Pump

A submersible dredge pump is a specially designed pump designed to operate fully submerged in water, sand or other muddy materials. These pumps are primarily used in dredging operations to extract and transport a mixture of water, sediment and other solid materials from the bottom of a body of water such as a river, lake or harbor.

The main feature of submersible dredge pumps is their ability to operate efficiently while fully submerged in the material being pumped. This allows them to be deployed in a range of challenging aquatic environments where traditional surface mounted horizontal pumps would be ineffective or unsuitable.

Submersible dredge pumps are typically equipped with rugged construction, heavy-duty impellers and specialized sealing mechanisms to withstand the high levels of wear and debris encountered during dredging operations. Their compact and self-contained design also makes them ideal for use in confined spaces or areas with limited accessibility. By leveraging the advantages of submersible technology, submersible dredge pumps play a vital role in maintaining and improving waterways, ports and other aquatic infrastructure, effectively removing accumulated sediment and debris.

2.Types of Submersible Dredge Pumps

2.1Submersible Dredge/Slurry Pump

Electric drive represents a prevalent mode of propulsion. Within this modality, the motor and the Submersible Dredge Pump are integrated coaxially, enabling the motor shaft to rotate the Submersible Dredge Pump impeller, subsequently transferring energy to the slurry medium and inducing a specific flow rate. This facilitates the movement of solids and achieves the transportation of slurry. Electric drive boasts high stability and minimal noise levels. When selecting an electric-driven Submersible Dredge Pump, it is crucial to consider the power voltage of the on-site electricity supply, as this may vary across nations. Recognizing this, OCEAN Pump frequently tailors motors to cater to client requirements, encompassing voltages such as 380V/440V and frequencies of 50HZ/60HZ. In scenarios where there is no access to on-site power, some clients opt to employ generator sets for power generation. The electric-driven Submersible Dredge Pump offers ease of control, compact dimensions, lightweight construction, relatively secure installation and configuration, and is devoid of environmental issues such as hydraulic oil leaks.

2.2Submersible Dredge Pump with Water Gun

For long-term accumulation of sediment, OCEAN Pump engineers recommend equipping two to three high-pressure water guns. The impact force of the water gun can disperse the sediment into the water and improve the efficiency of sand extraction. The supply pressure of the high-pressure water pump is recommended to be 4-6 kg, and the power should be slightly lower than 2-3 specifications of the submersible sand pump (for example: when using a 22kw submersible sand pump, it can be equipped with a 7.5-11kw high-pressure pump).

2.3Submersible Dredge Pump with Agitators

In the event that the clay layer comes into contact with the sand pumping process and exhibits significant viscosity, with the high-pressure water pump yielding limited effectiveness, it is advisable to utilize an external side agitator for direct mixing, thus achieving the mixing sand pumping method. Currently, the side agitator’s power ranges from 4kw to 22kw, and it can be tailored to meet the specific requirements of customers. It is noteworthy that different agitator types yield varied flow fields and shear forces during the mixing process, leading to differences in mixing effects. In this regard, OCEAN Pump has designed a cutter-type agitator to accommodate diverse working conditions.

When selecting a submersible dredge pump equipped with an efficient agitator, it is imperative to take into account the number, specifications, and type of agitator blades comprehensively. This ensures that the synergistic operation of the agitator and the submersible dredge pump can satisfy the operational requirements.

2.4Hydraulic Submersible Dredge Pump

Hydraulic drive, as an increasingly popular driving mode, is gradually gaining more customer favor. Its emergence has provided greater torque output possibilities for high-power applications. Hydraulic drive systems, with their exceptional performance, have become the preferred driving solution in numerous industries.

Hydraulic drive systems can be applied in two main ways. First, some customers choose to directly utilize the hydraulic system of an excavator to drive the submersible dredge pump. Through the control system of the excavator, users can easily achieve precise control over the output power, flow rate, and direction, significantly improving work efficiency. The advantage of this method is that it fully utilizes the existing equipment resources, reducing investment costs.

The other approach is to use a hydraulic pump station to provide the drive. This method uses a diesel engine to drive the oil pump, powering the hydraulic submersible dredge pump. Compared to the first method, this approach has a more independent driving system, providing greater flexibility. Additionally, the diesel engine-driven oil pump offers high reliability and adaptability, maintaining stable performance even in harsh environments.

OCEAN Pump will select hydraulic or electric-driven pumps based on the specific application scenarios and requirements. By comprehensively considering the advantages and disadvantages of various driving methods, as well as the application needs, we provide our customers with reasonable choices.

2.5Submersible Gravel Pump

The working medium of some submersible gravel pumps often contains particles of various sizes. Due to their unique application scenarios, these pumps have extremely high performance requirements. In this regard, traditional closed-impeller slurry pumps have poor flow performance and are prone to clogging, making it difficult to meet the demand for continuous and efficient operation.

To address this issue, the leading water pump research and development company in China, OCEAN Pump, has developed large particle sand pumps specifically tailored to meet these challenges. This pump employs a semi-open or three-vane impeller structure, effectively ensuring the pump’s passage performance and enabling continuous operation. Compared to closed-type slurry pumps, the large particle submersible sand-dredging pumps have better fluidity, stronger wear resistance, and can maintain stable operation in mediums containing particles of varying sizes. The maximum allowable particle size can reach up to 127mm. The unique impeller design not only ensures flow and head, but also features a large passage, effectively preventing clogging.

Submersible Dredge Pump Parameter Table

3.How Long Can a Submersible Dredge Pump Stay Underwater

submersible dredge pumps are designed to transport large volumes of liquid from one location to another. These pumps are carefully engineered to operate without any lubricants to cool the motor. Instead, the pumped liquid serves as the coolant, ensuring the motor remains cool throughout the entire operation. Submersible pumps are highly durable and efficient, able to run for extended periods if needed. They can be submerged underwater and operated 24 hours a day.

However, it is recommended to run the pumps intermittently to avoid unnecessary damage and maintenance costs. For corrosive working media, it is best to avoid repeatedly taking the submersible dredge pumps out of the liquid, as the chemical reaction between the media and air can accelerate the pump’s corrosion.

OCEAN Pump provides comprehensive services for each customer, including maintenance and operation manuals. For more information, you can directly contact Lingda Kong.

Lingda Kong
Tai’an Ocean Pump Co.,Ltd
Mobile/Viber/Whatsapp/Wechat: +86 18562293317
Email: sales@slurrypumpdm.com