中文
In projects such as land reclamation and channel dredging, dredging hoses have long been considered consumables. In the event of a sudden hose burst, not only will it cause work stoppages and delays, but it may also lead to marine pollution or safety accidents. With systematic maintenance, most hose failures can be predicted and avoided in advance.
Three most common injury mechanisms
Before developing a maintenance plan, it is necessary to understand the main failure modes of dredging hoses under harsh operating conditions:
Inning abrasion and erosion
High-speed flowing sand and gravel exert a continuous cutting effect on the inner lining in turbulent areas (such as bends and changes in diameter). This is the most common type of damage to dredging hoses.
Mechanical damage and environmental erosion of the cover
The dredging site environment is complex, and the hose is subject to aging and degradation due to ultraviolet radiation. At the same time, the cover is torn due to friction with the hull, dragging sharp rocks, or accidental contact with the propeller. If the reinforcement is infiltrated by water or corroded by seawater, the pressure-bearing capacity of the hose will decrease significantly.
Stress concentration and fatigue at the fitting
The fitting area bears the greatest local stress in the entire hose system. Twisting of the hose during installation, excessively small bending radius, or frequent pressure fluctuations during delivery will further increase the stress on the fitting area. If left in this condition for an extended period, the adhesive layer near the fitting may peel off in layers, and in severe cases, the joint may detach from the hose body.
Maintenance system
Based on the structural characteristics of CDSR hoses, the following layered maintenance strategy is recommended.
1.Routine inspection based on damage characteristics
Establish a standardized checklist:
Cover inspection: Look for cuts, wear, bulges, or hardening. In the electrolytic environment of seawater, surface scratches may evolve into the starting point of stress corrosion cracking.
End connection inspection: Check whether the bolts are loose, and whether there is any leakage or relative displacement at the connection between the hose and the metal joint.
Integrity check of floatation jacket: Check the floatation jacket for damage or water ingress. Loss of buoyancy alters the stress distribution on strings and increases additional bending stress.
2.Detection method
Wall thickness inspection: Regularly inspect the wall thickness of critical pressure-bearing sections (especially within a certain range of joints) and predict the remaining service life through data trend analysis.
Pressure and diameter tests: After overhaul, the hose should undergo a hydrostatic pressure test, and a gauging ball should be used to check whether the inner wall has shrunk due to expansion.
3.Storage and handling specifications
When the hose is not in use:
Environmental control: It should be placed in a cool, dry, ozone-free environment (away from the motor) and stored on a steel rack. Please note that although the outer rubber layer of the hose is resistant to ultraviolet rays, seawater, salt spray and wide temperature variations (working environment temperature -20°C～+50°C), it is still recommended to avoid direct sunlight during long-term storage to maximize the product's lifespan.
Prevent permanent deformation: Keep it straight or coiled along its natural curve to avoid bending under its own weight. Do not place heavy objects on top of the hose.
On-site repair and professional treatment
Surface damage: If it is only a minor scratch on the cover and the reinforcement is not exposed, small cracks and leaks can be quickly repaired using repair tools to prevent contaminants from entering.
Structural damage: For severe damage or complex situations, it is recommended to seek professional repair. Professionals can ensure that repairs meet industry standards and extend the life of the hose.
Data analytics and lifecycle management
Create a record: Establish an identification record for each hose, recording its installation date, operating conditions (pressure, flow rate, solid content), fault records, and maintenance history.
Optimizing Procurement Strategy: By analyzing data, if it is found that the hose wear rate in a specific location is significantly faster than in other locations, consider upgrading to a higher-wear-resistance CDSR armored hose in that location, rather than frequently replacing standard hoses.
Date: 11 Nov 2026