The dredge pump is a key component of a dredger, responsible for extracting and transporting sediment, sludge, and other materials from the water body. The selection and operation of dredge pumps are crucial for ensuring efficient and effective dredging operations. In this article, we will focus on discussing the selection and operating precautions of submersible dredge pumps.

1. Introduction of OCEAN ZJQ Submersible Dredge Pump:

ZJQ submersible dredge pump is pumping machinery, the motor and the pump of which are coaxially submerged in medium to work. The flow channel parts of the pump are made from high alloy wear-resistant material, so the pump has good wear resistance and large flowing passage. It is applicable for conveying media such as sludge, ore slurry, coal slurry, sandstones containing big solid particles. The product is designed and manufactured by domestic and over sea advanced technologies. Besides the main impeller, the bottom of the pump is additionally provided with a set of agitation impeller which can spray the deposited sludge into turbulent flow, and therefore the pump realizes high-concentration conveying under the condition of no auxiliary device. The unique seal device can effectively balance the pressure inside and outside the oil chamber, so as to project the reliability of the mechanical seal to the maximum extent. The motor adopts various protective such as overheat protection, water inlet detecting projection, and can operate safely for a long term in harsh working conditions. The pump is applicable for pumping sand for building, silty sand, silt, tailing slurry, ore, iron sand ore, sediment in sewage treatment works, etc.

2. Structural Property:

2.1 The whole machine is dry submersible pump, and the motor adopts oil chamber seal mode and is provided with mechanical seal inside, so that high pressure water and impurities and are effectively prevented from entering inner cavity of the motor.

2.2 Besides the main impeller, there is the agitation impeller which can agitate the sludge deposited on the water bottom into turbulent flow and pump the sludge out.

2.3 The trans-flux parts such as the impeller and the agitation impeller are made from high-hardness high chromium cast steel, have wear resistance, corrosion resistance and strong drainage capacity, and allow big solid particles to pass.

2.4 The motor is submerged in water, is not limited by suction stroke, and has high sludge suction rate and thorough desilting.

2.5 The integral device is simplified, needs no auxiliary stirrer device or ejector device, and has simple and convenient operation and low total investment of the unit.

2.6 The agitation impeller directly approaches the depositional surface, and controls the concentration through submerged depth. Under the condition of large medium proportion, an auxiliary device can be arranged to increase the concentration of the medium.

3. Use Conditions of OCEAN ZJQ Submersible Dredge Pump

3.1 The normal power source is 50Hz/380V three –phase alternating-current supply. Other frequency and voltage are customized according the worksite situation and the customers’ requirements.

3.2 The temperature of the medium cannot exceed 60℃, and the medium does not contain inflammable or explosive gases.

3.3 The maximum weight concentration of the solid particles in the medium: the maximum weight concentration of the ash is 45% and maximum weight concentration of the slag is 60%.

3.4 The normal submerged depth of the unit is not more than 20 meters, and the minimum submerged depth takes submerging of the motor as reference. With technological upgrades, OCEAN Pump submersible pumps have been able to reach a diving depth of 130 meters.

3.5 The unit works in the medium vertically, and the working status is continuous.

4. Selection of Submersible Dredge Pump:

ZJQ submersible dredge pump has many specifications to meet different working conditions of different users. As long as specifications and modes meeting the working conditions are reasonably and correctly selected, the best benefit can be obtained with less investment, simultaneously, reasonable working conditions can effectively prolong the service life of the pump, and the methods are as follows:

4.1 Field Conditions:

Where the field conditions (such as voltage, frequency, water quality, power source and capacity) accords with the use conditions is mastered.

4.2 The pump specification is selected:

4.2.1 Initial selection of the flow rate:

The flow rate of the pump is determined according to demands.

4.2.2 Determination of pipes:

Critical sedimentation flow velocity is calculated according to the conveyed medium, so as to reasonably select the pipe diameter.

4.2.3 Calculation of pip loss:

The pipe loss is calculated according to the length of the pipe and the number of the siphons and valves.

4.2.4 Calculation of the pipe lift:

The pump lift= vertical height difference from the water surface to the water outlet +pipe loss +outlet pressure+ safety margin(10%)

4.2.5 The pump specification is determined according to the pump lift and flow rate.

4.2.6 The installation mode is determined: fixed mode and mobile mode.

4.3 Friendly Tips:

4.3.1 Only closed system has outlet pressure, and the outlet pressure of the open system is zero.

4.3.2 The power of the matched motor of the pump is calculated according to intermediate concentration (the medium density is 1.3.), and the power should be rechecked when the pump is used for high-concentration conveying.

4.3.3 When the medium cannot submerge the motor or the temperature of the medium is more than 60℃, cooling water is 5-8m3/h.

4.3.4 The outlet of the pump should be provided with a valve, when the pump is started, the valve should be closed and then the motor is started, and the valve is gradually opened after the motor normally rotates.

4.3.5 The valve should be closed first and then the power source is cut off when the pump is shut down, so as to prevent water hammer in the pipe from severely damaging the pump.

4.3.6 In order to prevent blockage of the pipe, clear water should be conveyed for a while to clean the pipe before machine halt, until clear water flows out from the water outlet.

5. Conclusion:

Selecting the right submersible dredge pump is essential for efficient and effective dredging operations. The OCEAN ZJQ submersible dredge pump offers excellent wear resistance, corrosion resistance, and strong drainage capacity. By following the provided guidelines for use conditions, pump selection, and operating precautions, you can maximize the benefits of the submersible dredge pump.

Efficient dredging operations not only enhance productivity but also contribute to environmental preservation by maintaining water bodies and managing sediment and sludge effectively. Submersible dredge pumps play a vital role in achieving these objectives, and with proper selection and adherence to operating precautions, they can deliver outstanding performance and longevity.

Investing in the appropriate submersible dredge pump, considering the operational conditions and requirements of your project, ensures optimal performance and cost-effectiveness. Regular maintenance, including monitoring the pump’s performance and addressing any issues promptly, will further extend its service life and maximize its efficiency.

With advancements in technology, submersible pumps of OCEAN Pump have reached impressive diving depths, expanding their application possibilities. However, it is crucial to always operate the pump within its specified limits and follow the manufacturer’s guidelines for safe and efficient usage.

By prioritizing the selection of the right submersible dredge pump and implementing the recommended operating precautions, you can achieve successful dredging operations, improve productivity, and contribute to the sustainable management of water bodies.

Contact with us for more details:
Sally Peng

Tel /WhatsApp /Wechat :+86 18554212226   +86 13793808065

Email: oceanpump2@tsbeng.com, sales@sanddredgers.com