Submarine Pneumatic Fender
Submarines and other vessels which contact fenders below waterline require a unique solution. Hydro Pneumatic Fenders are specially adopted to this application. The fender body is partially water-filled, then pressurized with air and ballasted to make it stand vertically. Fender draft can be tuned by altering the water: air ratio and inflation pressure. The initial pressure is set to 50kPa.
Description
Submarine Pneumatic Fender
Luhang has supplied Yokohama type submarine pneumatic fenders to many navies around the world, including those of Australia, Brazil, Canada, Greece, Japan, the United Kingdom and the USA. The Yokohama submarine floating fender was launched in 1995 and since then has been extensively used by navies across the world.
Advantages of fenders over alternative, traditional berthing methods include:
- Cost effective replacement for deep water catamarans
- Easily moved to provide flexibility in berthing
- Easily transported to provide emergency berthing facilities
- Maintenance requirement almost non-existent
- Unaffected by extreme climatic conditions
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Sumbmarine Pneumatic Fender Design and Structure
In order to provide full protection at surface and subsurface, our submarine pneuamtic fenders are deployed vertically. To maintain their position, the fenders are water ballasted and also have a counterweight attached to the bottom of the fender. The weight, shape and method of deployment of the counterweight can be adjusted to suit individual situations.
Submarine fenders are designed to offer higher bursting strength than a normal surface fender, with the minimum burst pressures being:
- 2000mm diameter and smaller = 4.9kgf/cm2
- 2500mm diameter and larger = 5.7kgf/cm2
To facilitate water charge and discharge, flange openings are sited at each end of the fender. In addition, submarine fenders are fitted with a safety valve to enable excess pressure to be released should over compression occur.
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Features on Sumbamrine Pneumatic Fender
1. Submerged Contact Area
2. Low Hull Pressure
3. Adjustable Draft
4. Movable
5. Prevents Acoustic Tile Damage
Applications of Submarine Pneumatic Fender
1. Submarines
2. Some fast ferries
3. Semi-submersible rigs
Submarine Pneumatic Fenders Sizes and Performance Values
Fender Size | Water (%) | Compression (%) | Initial Pressure 50kPa | ||
Diameter D (mm) | Length L (mm) | Energy kNm | Force kN | ||
2000 | 4000 | 60 | 45 | 99 | 385 |
0 | 60 | 431 | 1177 | ||
2000 | 6000 | 65 | 45 | 155 | 599 |
0 | 60 | 431 | 1177 | ||
2500 | 5500 | 65 | 45 | 223 | 687 |
0 | 60 | 928 | 2037 | ||
3300 | 6500 | 60 | 45 | 616 | 1247 |
0 | 60 | 1913 | 3169 | ||

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