Yokohama pneumatic fenders are widely used in ship-to-ship (STS) operations, port docking, and offshore protection systems.
They are designed to absorb impact energy between vessels or between a vessel and a structure, helping prevent hull damage during berthing.
In this guide, you will learn how to properly use Yokohama pneumatic fenders, including installation methods, air pressure control, maintenance practices, and performance optimization based on ISO 17357 standards.
1. Yokohama Pneumatic Fender
A Yokohama pneumatic fender is a marine rubber fender filled with compressed air, acting as a floating buffer between ships or between ship and quay.
It is designed according to ISO 17357 standard, which defines performance requirements such as:
- Air tightness
- Rubber strength
- Energy absorption capacity
- Pressure resistance
Key Features:
- High energy absorption
- Low reaction force
- Suitable for tidal variations
- Easy deployment and relocation
2. How Pneumatic Fenders Work
Pneumatic fenders absorb kinetic energy through air compression inside a rubber body.
When a vessel presses against the fender:
- Air inside is compressed
- Internal pressure increases
- Impact energy is converted into compressed air energy
- Reaction force is controlled and distributed
This makes them ideal for large vessel operations where impact force is significant.
3. Proper Installation of Pneumatic Fenders
Correct installation directly affects safety and performance.
Step 1: Positioning
Place fenders between:
- Ship-to-ship (STS)
- Ship-to-dock
- Ship-to-buoy
Ensure alignment with the contact point of hull curvature.
Step 2: Suspension System
Use:
- Chains
- Wire ropes
- Shackles
- Swivel fittings
This prevents displacement during tidal movement.
Step 3: Height Adjustment
Adjust according to:
- Vessel draft
- Tide level
- Contact zone
4. Recommended Air Pressure Management
Air pressure is the most critical performance factor.
Standard Working Pressures:
- 50 kPa (low pressure type)
- 80 kPa (high pressure type)
Important Rules:
- Never exceed rated pressure
- Check pressure before each operation
- Adjust according to temperature changes
- Use calibrated pressure gauge
Engineering Insight:
Higher pressure increases energy absorption but also increases reaction force.
5. How to Maximize Fender Performance
To get the best performance from Yokohama pneumatic fenders:
✔ Match Fender Size to Vessel
- Small vessels → 0.5m–1.5m diameter
- Large vessels → 2.0m–4.5m diameter
✔ Use Correct Fender Quantity
Multiple fenders should be used for large contact zones.
✔ Optimize Contact Angle
Incorrect angles reduce energy absorption efficiency by up to 30%.
6. Maintenance and Inspection Guide
Proper maintenance extends service life significantly.
Routine Checks:
- Air pressure stability
- Surface cracks or abrasions
- Valve sealing condition
- Chain wear and corrosion
Cleaning:
- Use fresh water after seawater exposure
- Avoid chemical solvents
Storage:
- Keep in dry shaded area
- Avoid UV long-term exposure
- Deflate slightly when not in use
7. Common Applications
Yokohama pneumatic fenders are widely used in:
- Ship-to-ship LNG transfer
- Oil tanker operations
- Harbor docking protection
- Offshore platform support
- Emergency berthing operations
8. Advantages Over Solid Rubber Fenders
| Feature | Pneumatic Fender | Solid Rubber Fender |
|---|---|---|
| Energy absorption | High | Medium |
| Reaction force | Low | High |
| Portability | Excellent | Limited |
| Cost efficiency | High for large ships | Better for small docks |
9. Safety Considerations
To ensure safe operation:
- Do not overinflate
- Inspect before deployment
- Avoid sharp hull edges contact
- Use protective net for heavy-duty operations
10. Why ISO 17357 Compliance Matters
ISO 17357 ensures:
- Consistent performance worldwide
- Material quality control
- Safety under extreme conditions
- Predictable energy absorption behavior
Always choose ISO-certified pneumatic fenders for marine operations.
Conclusion
Yokohama pneumatic fenders are essential equipment for modern marine operations, offering high energy absorption and reliable protection in STS and docking environments.
Proper installation, correct pressure management, and routine maintenance are key to maximizing performance and service life.
Need Marine Fender Solutions?
If you are looking for:
- Pneumatic fenders
- Foam filled fenders
- Marine buoy systems
- Custom harbor protection solutions
Contact our engineering team for technical support and quotation.