In a dredging project, monthly production is a key indicator of project success or failure, and also a key indicator of project profitability. Improving monthly production can serve as a beacon for improving project efficiency and overall success. The biggest factors in production are soil type and excavation depth, but the soil is predetermined. As can be seen from the cutter suction dredger production formula below. The production of a cutter suction dredger depends mainly on three factors: dredging operation time, water flow rate, and mud concentration/density.
Production (yield) = dredging operation time * mud water flow rate * mud concentration/density (%).
Although soil type and excavation depth are key determinants of production, the plasticity of these factors is often limited. In-depth research on the core factors affecting production is essential to fully utilize the potential of cutter suction dredgers. In this article, we will conduct a simple analysis on the issue of how to increase the production of dredgers.
1. Dredging operation time improves the production of cutter suction dredgers.
One of the main factors affecting the production of cutter suction dredgers is the dredging operation time.
When the water flow rate and mud concentration are constant, the production can be increased by increasing the dredging operation time. Since the time of year is the same every month, the only way to increase dredging operation time is by reducing downtime.
The main factors that cause dredger downtime are: moving the dredger, moving anchors, removing pipes, removing obstructions, changing dredger teeth, adding water, changing pumps, repairs, etc.
Maximizing the time spent on actual dredging activities can greatly increase the overall output of the project. Efficient planning, streamlining processes and minimizing downtime are key strategies to increase dredging operation time.
2. Increase the mud water flow rate of the cutter suction dredger
Under the condition of the same mud concentration, increasing the water flow rate can significantly increase the hourly output of the cutter suction dredger.
There are many ways to increase the water flow rate:
A). Reduce the maximum mud discharge distance.
When laying the pipeline before the project starts, try to shorten the mud discharge distance.
B). The pipeline is laid straight, reducing the number of climbing times and reducing the resistance of the mud in the pipeline.
C). Reduce the mud discharge height.
If conditions permit, reducing the mud discharge height can reduce the head loss and increase the water flow rate.
D). Reduce the dredging depth.
Under the same soil conditions, the greater the dredging depth, the smaller the water flow rate. Therefore, in the dredging and reclamation project, appropriately reducing the dredging depth can increase the water flow rate.
E). Minimize the number of floating pipes in the water, reduce the mud resistance in the mud discharge pipe, and increase the water flow rate.
F). If the conditions of the mud pump diesel engine permit, increase the mud pump speed, which can increase the initial energy, increase the flow rate, and increase the mud flow rate. The mud pump main diesel engine can be used.
G). Strictly control the gap between the pump casing and the mud nozzle, reduce the gap between the impeller and the bushing, and improve the efficiency of the mud pump.
H). Clear obstacles in time.
When there are obstacles at the mud suction port, mud pump, pipe head, etc., it will seriously affect the water flow and cause pipe blockage. In severe cases, it will cause pipe blockage. Therefore, obstacles should be removed in time to ensure smooth water flow in the dredging pipeline.
I). Increase the pipe head diameter within the range allowed by the mud pump diesel engine.
J). Make the discharge pipe with materials with low friction resistance.
The water flow rate of the mud used in dredging operations is another key factor affecting the output of the cutter suction dredger. Higher water flow can speed up dredging and improve dredging efficiency, thereby increasing total output. Regular maintenance of pumps and pipelines and ensuring continuous and sufficient water supply are essential to optimize mud and water flow.
3. Mud concentration/density to be considered when increasing the mud discharge volume of a cutter suction dredger
Soil quality is the main factor that determines mud concentration. Under certain soil quality factors, other methods can be used to appropriately increase mud concentration.
A). Select the appropriate depth of the cutter suction dredger to cut into the mud.
Different soil qualities have different optimal thicknesses for cutting into the mud.
If the thickness of the cut into the mud is too thin, the mud concentration cannot be achieved.
If the thickness of the cut into the mud is too thick, horizontal movement is difficult and the mud discharge volume is low. Only when the thickness of the cutter head cutting into the mud is the most appropriate can the optimal horizontal movement and the appropriate mud discharge volume be achieved.
B). Appropriate cutting head forward distance.
Generally speaking, the harder the soil, the smaller the distance the cutting head advances; the softer the soil, the greater the distance the cutting head advances.
For the same soil quality, if the distance the cutting head advances is too large, the mud discharge volume will be greater and the mud discharge volume will be more difficult to increase.
If the distance the cutter head advances each time is too small, the cutter head will idle, and it will not be easy to excavate the mud and increase the mud concentration.
C). Use different cutter heads according to different soil conditions.
For loose to medium-concentration/density soft soils such as silt, silt, peat, and sand, it is recommended to use a crown blade cutter with a larger front diameter.
For clay, it is recommended to choose a small-diameter sharp-tooth cutter.
For hard soil, it is advisable to choose a small-diameter sharp-tooth cutter.
For rock, it is advisable to use a rock cutter with replaceable teeth.
D). Use an underwater pump.
The closer the pump is to the mud suction port, the lower the vacuum required to lift the mud and sand from the seabed/riverbed to the underwater pump, and the greater the mud concentration that can be achieved.
E). Make full use of low tide construction.
When dredging at low tide, the bridge has a smaller inclination, the vacuum required to lift the mud to the mud pump is smaller, and the mud concentration is greater.
For productivity, water flow and mud concentration are not independent, but interact with each other. Under certain conditions, increasing water flow must be at the expense of reducing mud concentration, and an increase in mud concentration will inevitably reduce water flow.
If there is only water flow but no mud concentration, the dredger can absorb water instead of mud.
Production can be increased by matching the mud pump discharge pipe diameter, optimal water flow and mud concentration.
Mud concentration and density are therefore parameters that significantly affect the performance of a cutter suction dredger. Maintaining optimal mud concentration and density levels is essential to maximize the efficiency and production of dredging operations. By adjusting these factors to the specific requirements of the project, the mud discharge capacity of the cutter suction dredger can be increased.
4. Conclusion
In essence, optimizing monthly production in a dredging project depends on a meticulous understanding of the factors that have the greatest impact. By developing strategies to extend dredging operation time, fine-tuning mud and water flow rates, and carefully considering mud concentration/density, project managers can chart a path to improve the efficiency and productivity of cutter suction dredging operations. By implementing tailored measures and integrating cutting-edge methods, projects can move beyond limitations and toward higher levels of success and profitability. Embrace these principles and watch your dredging operations move toward new achievements.
You can get the most out of the least amount of time. If you unify dredging operation time, water flow rate, and mud concentration, and minimize these unfavorable factors, maximize dredging operation time, water flow rate, and mud concentration to achieve optimal performance, your return on investment will be quick.
