Hongruntong Marine Co., Ltd.
| Payment Terms | L/C, D/A, D/P, T/T, Western Union, MoneyGram |
| Supply Ability | 5910 Units Per Months |
| Delivery Time | 5-6 Work Days |
| Packaging Details | Wooden Pallets, Wooden Cases or as Required |
| Product Name | Submarine Fenders |
| Advantage | Customized, Original Factory |
| Application | Dock |
| Diameter | 0.5 ~ 4.5m |
| Pressure | 50 KPA ~ 80 KPA |
| Warranty | 36 Months |
| Material | Top Level Natural Rubber |
| Length | 1 ~ 12m |
| Standard | ISO17357:2014 |
| Brand Name | Hongruntong Marine |
| Model Number | HM-SF12 |
| Certification | ISO, BV, ABS, DNV, LR, SGS, CCS, RMRS |
| Place of Origin | China |
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Product Specification
| Payment Terms | L/C, D/A, D/P, T/T, Western Union, MoneyGram | Supply Ability | 5910 Units Per Months |
| Delivery Time | 5-6 Work Days | Packaging Details | Wooden Pallets, Wooden Cases or as Required |
| Product Name | Submarine Fenders | Advantage | Customized, Original Factory |
| Application | Dock | Diameter | 0.5 ~ 4.5m |
| Pressure | 50 KPA ~ 80 KPA | Warranty | 36 Months |
| Material | Top Level Natural Rubber | Length | 1 ~ 12m |
| Standard | ISO17357:2014 | Brand Name | Hongruntong Marine |
| Model Number | HM-SF12 | Certification | ISO, BV, ABS, DNV, LR, SGS, CCS, RMRS |
| Place of Origin | China | ||
| High Light | corrosion resistant marine fender ，high load capacity submarine fender ，easy installation marine fender | ||
Corrosion Resistant Design Marine Fender High Load Capacity Easy Installation
Description
Submarine Fenders are specialized marine support components designed to protect vessel hulls and dock infrastructure during dry docking, maintenance, and repair operations. Installed beneath or alongside vessels in dry docks and maintenance berths, these fenders function as load-distributing and shock-absorbing elements, ensuring stable vessel positioning and minimizing structural stress.
Hongruntong Marine Submarine Fenders for dry dock applications are manufactured from high-resilience marine rubber compounds combined with optimized internal reinforcement structures. The design enables the fenders to withstand sustained static loads as well as dynamic forces generated during docking, lifting, and repositioning procedures. Standard and customized specifications are available to suit different dock layouts, vessel sizes, and hull configurations.
From a technical perspective, these Submarine Fenders offer excellent compression recovery, high abrasion resistance, and outstanding dimensional stability under prolonged loading conditions. The rubber material maintains elasticity even after repeated compression cycles, reducing the risk of permanent deformation and ensuring consistent support performance over time.
Functionally, the fenders help eliminate uneven load concentration between hull and dock blocks, significantly lowering the risk of hull plating damage, coating failure, or structural misalignment. Their modular construction allows for flexible placement and adjustment within the dock, improving operational efficiency and reducing labor intensity during maintenance preparation.
Submarine Fenders are widely adopted in commercial ship repair yards, naval maintenance facilities, and offshore service bases, providing a reliable and reusable support solution that enhances safety while reducing long-term operational costs.
Case Study
A coastal ship repair yard was assigned to conduct scheduled dry dock maintenance for a 25,000 DWT product tanker. During previous docking operations, the yard encountered issues with traditional rigid support blocks, which caused uneven pressure distribution along the hull bottom and resulted in localized coating damage and extended inspection time.
Hongruntong Marine supplied a series of Submarine Fenders specifically designed for static load support in dry dock conditions. The fenders were arranged in combination with existing dock blocks to provide additional elasticity and load distribution beneath high-stress hull sections.
Throughout the docking period, the Submarine Fenders maintained stable deformation characteristics under continuous load, effectively compensating for minor hull geometry variations. Hull contact pressure was noticeably reduced, and no surface damage was observed during inspection. The maintenance operation was completed on schedule, and dock preparation time was reduced due to simplified alignment requirements.
The shipyard reported improved safety conditions for personnel working beneath the vessel and confirmed that the Submarine Fenders could be reused for subsequent tanker maintenance projects, highlighting strong repeatability and favorable cost efficiency.
Specifications
| Product Name | Submarine Fenders |
| Material | SBR, NR |
| Size Available | 3.3*10.6M |
| Tensile Strength | => 18 MPA |
| Density | 90+/-5 |
| Colour | Black |
| Application | Submarine, ferry, oil rigs and so on |
| Hardness | 40-70 Shore A |
| Elongation | => 400 |
| Tear Strength | => 400 N/cm |
| Breaking Strength | >310 |
|
Chemical Resistance
|
Fuel A: No deterioration |
| Oil 3: No deterioration | |
| Lubricating oil: No deterioration | |
| Cutting oil: No deterioration | |
| Dilute HCL: No deterioration |
| Diameter x Length |
Initial Internal Pressure |
Ship Radius |
Water Ratio |
Guaranteed Energy Absorption |
Reaction Force at GEA |
Hull Pressure at GEA |
Deflection at GEA |
| (mm x mm) | (kPa) | (mm) | (%) | (kJ) | (kN) | (kPa) | (%) |
| 1500 x 6100 | 50 | 3000 | 60% | 131 | 562 | 140 | 51% |
| 80 | 186 | 754 | 188 | ||||
| 1700 x 7200 | 50 | 4000 | 65% | 167 | 682 | 137 | 47% |
| 80 | 239 | 918 | 184 | ||||
| 2000 x 6000 | 50 | 4000 | 70% | 135 | 544 | 131 | 41% |
| 80 | 194 | 736 | 177 | ||||
| 2500 x 5500 | 50 | 4500 | 65% | 225 | 769 | 135 | 41% |
| 80 | 322 | 1035 | 182 | ||||
| 2500 x 7700 | 50 | 4500 | 70% | 326 | 1016 | 136 | 41% |
| 80 | 470 | 1368 | 183 | ||||
| 3300 x 6500 | 50 | 4500 | 75% | 307 | 887 | 127 | 35% |
| 80 | 442 | 1203 | 173 | ||||
| 3300 x 10600 | 50 | 5000 | 65% | 1003 | 2137 | 142 | 47% |
| 80 | 1429 | 2863 | 190 | ||||
| 4500 x 9000 | 50 | 5000 | 60% | 1439 | 2401 | 138 | 46% |
| 80 | 2059 | 3228 | 185 | ||||
| 4500 x 12000 | 50 | 6000 | 65% | 1977 | 3198 | 141 | 46% |
| 80 | 2819 | 4277 | 189 |
Characteristics
Stable Static Load Support
Designed for long-duration support, Submarine Fenders maintain structural integrity under sustained compression, making them ideal for dry dock maintenance and repair applications.
Excellent Elastic Recovery
High-quality rubber formulation ensures rapid shape recovery after unloading, minimizing permanent deformation and extending service life.
Enhanced Surface Wear Resistance
The fender surface resists abrasion caused by repeated contact with hull coatings and dock structures, reducing maintenance frequency.
Flexible Modular Configuration
Fenders can be easily positioned, combined, or adjusted to accommodate different hull shapes and dock layouts.
Applications
Dry Dock Vessel Maintenance
Used beneath vessel hulls to provide elastic support during inspection, repair, and coating operations.
Repair Yard Docking Operations
Improves hull protection and stability during vessel positioning and lifting within repair berths.
Naval Maintenance Facilities
Suitable for military and government vessels requiring controlled support and enhanced safety standards.
Offshore Service Base Operations
Provides temporary or semi-permanent support for offshore vessels during maintenance preparation.
Why Choose Hongruntong Marine
Specialized Marine Engineering Focus
Hongruntong Marine develops Submarine Fenders specifically for demanding marine maintenance and support environments.
Customization for Dock Conditions
Products can be tailored to dock dimensions, load distribution requirements, and vessel hull profiles.
Reliable Material Performance
Strict material selection and quality control ensure consistent elasticity and durability throughout the service life.
Long Term Cost Efficiency
Reusable design and reduced damage risk contribute to lower total ownership costs for shipyards and operators.
FAQ
1. Are Submarine Fenders suitable for long term static loading?
Yes. They are specifically engineered to handle sustained static loads during dry dock maintenance without significant loss of elasticity or structural integrity.
2. Can these fenders be combined with traditional dock blocks?
Yes. Submarine Fenders are often used alongside existing dock blocks to improve load distribution and hull protection.
3. What vessel types are suitable for this fender system?
They are suitable for tankers, bulk carriers, container ships, offshore vessels, and naval ships undergoing maintenance.
4. How is deformation controlled during extended use?
The rubber compound and internal structure are optimized to limit permanent deformation even under prolonged compression.
5. What maintenance is required for Submarine Fenders?
Minimal maintenance is required. Regular visual inspection and basic cleaning are sufficient to ensure continued performance.
Company Details
Business Type:
Manufacturer
Year Established:
1988
Total Annual:
7,462,700-11,940,300
Employee Number:
300~500
Ecer Certification：
Verified Supplier
HONGRUNTONG MARINE Welcome to Hongruntong Marine, your trusted source for professional rubber fender solutions. With expertise in manufacturing high-quality marine fenders, we are committed to providing reliable protection for your vessels during berthing operations. Our dedication to e... HONGRUNTONG MARINE Welcome to Hongruntong Marine, your trusted source for professional rubber fender solutions. With expertise in manufacturing high-quality marine fenders, we are committed to providing reliable protection for your vessels during berthing operations. Our dedication to e...
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