In projects such as river dredging, port construction, and waterway dredging, dredging hoses are the “key channel” for transporting sediment and slurry. However, many people tend to overlook details during use, leading to hose rupture and leakage. This not only affects project progress but may also pose potential safety hazards. Today, we will talk about the precautions for using dredging hoses to help you avoid common pitfalls!
Ⅰ.Selection: Selecting the right hose is the first step to safe use
Many people think “as long as the hose works for transportation, it’s fine”. In fact, a wrong selection will lead to constant problems afterward. When selecting a hose, you should focus on 3 key dimensions:
If the medium to be conveyed is slurry containing large-grained sand and gravel, you must choose hoses made of “high-wear-resistant rubber material” — such as fabric-reinforced wear-resistant hoses or steel-wire-reinforced wear-resistant hoses. Ordinary rubber hoses are easily worn through by particles. If the medium has slight corrosiveness (e.g., in seawater environments), select special acid- and alkali-resistant rubber hoses to prevent material corrosion and aging.
Every dredging hose has a “rated pressure” (marked on the outer wall of the hose). When selecting a hose, ensure the actual project pressure is ≤ the rated pressure. For example, if the actual operating pressure is 0.8MPa, you must not choose a hose with a rated pressure of 0.6MPa; otherwise, overpressure will cause the hose to bulge and rupture.
For outdoor operations that often encounter low temperatures (below -10℃), select low-temperature-resistant hoses — ordinary hoses will harden and break easily at low temperatures. If the hose needs to be moved frequently, prioritize lightweight models. At the same time, pay attention to the hose’s “bending radius” (the minimum bending radius is marked on the outer wall). For instance, if the minimum bending radius is marked as 50cm, do not force it into a 30cm bend; otherwise, the internal reinforcement layer will be damaged.
Ⅱ.Installation: Insufficient attention to details can easily lead to problems later
Minor oversights during installation may become the “trigger” for subsequent failures, and these 3 details must be closely monitored:
When connecting flanges or joints to both ends of the hose, do not force alignment during installation. For example, if there is a 1cm hole misalignment in the flange, do not force the hose to align by bending it; otherwise, the hose will remain in a state of constant stress for a long time and may easily crack. The correct approach is to adjust the flange position to ensure the hose is naturally aligned. After installation, shake the hose by hand — slight movement indicates a qualified installation.
Plan the installation path to avoid sharp components on the construction site, such as steel bars and angle steel. If avoidance is not possible, wrap rubber pads or sheet iron around the area where the hose contacts the sharp objects. At the same time, keep the hose away from heat sources like welding sparks and boilers. Rubber hoses exposed to high temperatures (exceeding 60℃) will accelerate aging and shorten their service life.
During dredging operations, the hose may expand or contract slightly due to medium impact or ambient temperature changes. Therefore, reserve an expansion allowance of 5%-10% during installation. For example, if a 10-meter hose is required, use a 10.5-11-meter hose for actual installation to prevent the hose from being stretched and broken due to expansion and contraction.
Ⅲ.Operation: Conduct standardized operation and avoid “over-range” use
Many hose damages are “caused by improper use” — these operation red lines must not be crossed:
During operation, monitor the pressure gauge. Once the pressure exceeds the rated value, immediately reduce the pump speed or close the valve. If the pressure exceeds the rated value by more than 10%, the risk of hose rupture increases by 3 times. At the same time, do not pursue “fast progress” by using the hose beyond its flow capacity — excessive flow will easily intensify turbulence inside the hose and wear down its inner wall.
When moving the hose, two people should lift both ends to move it; do not drag it directly on the ground. Sand and gravel on the construction site will wear through the hose’s outer wall. Furthermore, never allow construction vehicles or excavators to crush the hose. Even pressure-resistant hoses will have their internal reinforcing steel wires deformed after being crushed, which makes it impossible to restore their original strength.
When starting the dredge pump, open the valve slowly to allow the medium to enter the hose gradually — this avoids instant pressure impact causing the hose to “burst”. When shutting down the pump, first turn off the pump and then close the valve. This prevents medium backflow from generating negative pressure and damaging the hose’s inner wall.
Ⅳ.Daily Maintenance: Regular Inspection + Proper Care to Extend Service Life
Proper maintenance can extend the hose’s service life by more than 50%, and you should focus on these 2 key tasks:
- Check the outer wall before operation: Look for cracks, bulges, and wear. If wear exposes the internal reinforcing layer, the hose must be replaced.
- Check the joints: Inspect flange sealing surfaces for leakage and ensure hose clamps are not loose.
- Check the pressure valve: Confirm the pressure valve can perform normal pressure relief to prevent it from failing to protect the hose in case of overpressure.
After operation, always rinse the inside of the hose with clean water. This is especially critical if the hose has transported slurry containing clay and fine sand — residual sludge will adhere to the pipe wall and intensify wear during the next use. When rinsing, let water flow in from one end and out the other until the outflowing water becomes clear. Dry the hose before storage after rinsing.
Ⅴ.Storage: Even when not in use, the hose should still be “carefully cared for”
Many people pile idle hoses casually in the corners of the construction site, but improper storage will actually accelerate their aging.
The hose should be placed in a cool, dry, and well-ventilated area. Avoid direct sunlight (ultraviolet rays will cause the rubber to age and harden) and rain (moisture will cause metal joints to rust). Do not place it near oil stains or chemical reagents — oil stains can corrode the rubber, leading to hose swelling and deformation.
The hose should be coiled into circles with a diameter ≥ the minimum bending radius. For example, if the minimum bending radius is 50cm, coil it into circles with a diameter of over 1 meter, then secure it with ropes. Do not store the hose folded. For hoses that are idle for a long time (for more than 3 months), they should be turned over once a month to prevent deformation caused by long-term pressure on the same position.
Ⅵ.Emergency Handling for Common Issues
If you encounter these issues during use, don’t panic — handle them step by step:
Shut down the machine immediately and close the valves at both ends. If the leakage is at the joint, tighten the hose clamps or replace the gaskets. If the leakage is in the middle of the hose with a small crack (≤5mm), you can temporarily seal it with special repair adhesive. If the crack is large or there is a bulge, you must replace it with a new hose — do not continue to use it.
Shut down the machine and close the valves immediately, then evacuate personnel nearby to prevent slurry from splashing and injuring people. After cleaning up the site, check the cause of the rupture (whether it is due to overpressure, wear, or aging). Only after resolving the issue should you replace it with a new hose.
In fact, the “service life” of a dredging hose depends not only on product quality but also more on its usage and maintenance methods. By following the above 6 points, you can not only reduce the frequency of failures but also lower project costs. If you encounter uncertain issues during use, do not rely on experience to judge — consult the technical personnel of the hose manufacturer in a timely manner. Safety is always the top priority!
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