Hydro-Pneumatic Fenders
Hongruntong Marine’s Hydro-Pneumatic Fenders are purpose-built fendering systems designed for submarines and other low-freeboard vessels. Unlike traditional floating fenders, hydro-pneumatic fenders are partially water-filled and air-pressurized to remain in a vertical position while floating, ensuring safe contact with the vessel hull below the waterline. This specialized design makes them ideal for naval applications where precise underwater berthing is required.
Key Features
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Hybrid Air-Water System: Combines compressed air and water to maintain upright orientation and stable performance.
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Controlled Draft and Reaction Force: Customizable internal pressure and water ratio to suit different vessel types and berthing needs.
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Durable Construction: Reinforced rubber body with multiple layers of synthetic tire cord and high-strength flange ends.
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Corrosion-Resistant Hardware: Equipped with marine-grade valves and accessories for long-term durability.
Benefits
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Safe for Submarine Hulls: Soft reaction force reduces the risk of hull damage during berthing.
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Low Maintenance: Sealed, reliable design minimizes operational upkeep.
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Stable in All Conditions: Performs consistently in tidal zones and rough waters.
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Customizable Design: Tailored sizes, internal pressure, and water filling levels based on customer requirements.
Applications
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Naval Submarine Bases
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Underwater Research Vessels
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Submersible Support Operations
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Offshore Platforms and Drydocks
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Floating Docks for Low-Freeboard Vessels
Dimensions
| Fender Size [mm] |
Water [%] |
Diameter [%] |
Initial Pressure 50kPa (0.5 kg/cm²) |
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| Diameter | Length | Energy [kNm] |
Reaction [kN] |
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| 1700 | 7200 | 65 | 45 | 134 | 622 |
| 0 | 60 | 583 | 1569 | ||
| 2000 | 6000 | 65 | 45 | 155 | 599 |
| 0 | 60 | 647 | 1766 | ||
| 2500 | 5500 | 65 | 45 | 223 | 687 |
| 0 | 60 | 928 | 2037 | ||
| 3300 | 6500 | 60 | 45 | 616 | 1247 |
| 0 | 60 | 1913 | 3169 | ||
| 3300 | 10600 | 55 | 45 | 589 | 1275 |
| 0 | 60 | 3120 | 5170 | ||
| Standard tolerance of ± 8% | |||||
Detailed Photos
Why Choose Hongruntong Marine?
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Proven Experience – Professional manufacturer and supplier of Yokohama-type fenders with global project references.
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Quality Assurance – All fenders are tested under ISO 17357 standards to guarantee performance and safety.
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Customization Options – Tailored solutions for submarine hull shapes, pressure requirements, and operational environments.
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After-Sales Service – Technical support, maintenance guidance, and long-term spare part supply.
Technical Specifications
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Diameter: 1700 mm – 3300 mm
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Length: 7200 mm – 106000 mm
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Initial Internal Pressure: 50 kPa or as specified
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Water Filling Ratio: 40% – 60%
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Reaction Force & Energy Absorption: As per customer’s berthing energy calculations
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Design Standard: ISO 17357, customized naval specifications
Additional Highlights
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Optional Accessories: Water level indicators, mooring chains, end shackles, and support frames available.
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Turnkey Solutions: Full package including design support, delivery, and installation.
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Global Track Record: Successfully used in naval ports across Asia, Europe, and the Middle East.
FAQ
Q1: What makes hydro-pneumatic fenders different from standard pneumatic fenders?
A1: Hydro-pneumatic fenders are partially water-filled, allowing them to stay vertical and protect submarine hulls effectively, unlike standard floating pneumatic fenders.
Q2: Can hydro-pneumatic fenders be customized for different submarine sizes?
A2: Yes, Hongruntong provides a full range of diameters, lengths, and pressure levels to suit specific vessel types.
Q3: How long is the service life?
A3: With proper use and maintenance, hydro-pneumatic fenders can last for many years. Reinforced construction ensures durability in demanding marine environments.
Q4: Do you supply complete installation systems?
A4: Yes, we can provide chains, nets, and aircraft tire protection systems along with the fenders.
