Ship-to-ship (STS) transfer operations are common in the oil and gas industry. During these operations, two large vessels come alongside each other to transfer cargo. While this process improves efficiency, it also creates safety challenges.
Waves, currents, wind, and vessel movement can cause ships to move unexpectedly. Without proper protection, even a small impact between vessels can damage hull structures, interrupt cargo transfer, and create serious safety risks.
This case study explains how an offshore tanker operator improved safety during STS operations by installing pneumatische Fender and significantly reducing collision risks.
The Challenge: Frequent Vessel Contact During STS Operations
The client operates several Aframax tankers that regularly perform offshore STS transfers.
Before upgrading their berthing system, the operator faced several challenges:
- Vessel movement during rough weather
- High pressure on contact points between ships
- Increased risk of hull damage
- Frequent safety inspections
- Operational delays during cargo transfer
The problem became more serious during night operations and periods of strong wind. Crew members had to closely monitor vessel distance and continuously adjust mooring lines.
Although no major accident had occurred, the operator recognized that the risk level was increasing as transfer volumes grew.
The company decided to find a safer and more reliable solution.
Understanding the Safety Risks
Risk 1: Hull-to-Hull Contact
When two large tankers move independently in waves, they can drift closer together.
Without sufficient energy absorption, the vessels may come into direct contact.
This can result in:
- Damaged steel plates
- Scratched protective coatings
- Local structural deformation
- Expensive repair work
Even minor damage can require inspections before the vessel returns to service.
Risk 2: Cargo Transfer Interruptions
Every unplanned contact event can slow down operations.
If the crew suspects damage, they may need to:
- Pause cargo transfer
- Inspect affected areas
- Reposition vessels
- Obtain additional approvals
These interruptions increase operating costs and reduce efficiency.
Risk 3: Environmental Concerns
For oil tankers, safety is closely linked to environmental protection.
Any structural damage increases the possibility of:
- Oil leakage
- Pollution incidents
- Regulatory penalties
- Reputational damage
Preventing vessel contact is therefore an important part of environmental risk management.
Risk 4: Crew Safety
During berthing and transfer operations, crew members work on deck to monitor equipment and mooring lines.
Sudden vessel movement can create dangerous situations.
Reducing impact forces between vessels helps create a safer working environment for everyone involved.
Why the Client Chose Pneumatic Fenders
After evaluating several options, the operator selected pneumatic fenders for the project.
The chosen solution included:
- Diameter: 3.3 meters
- Length: 6.5 meters
- Initial Pressure: 80 kPa
- Chain and Tire Net (CTN) Protection
The decision was based on several key advantages.
Excellent Energy Absorption
Pneumatic fenders use compressed air to absorb berthing energy.
Instead of transferring impact forces directly to the vessel hull, the fender absorbs and distributes the energy.
This helps reduce stress on both vessels.
Niedrige Reaktionskraft
A high-quality pneumatic fender can absorb large amounts of energy while maintaining relatively low reaction force.
This is especially important during STS operations because it protects vessel structures from excessive pressure.
Adaptability to Tide and Vessel Movement
Unlike fixed berth fenders, pneumatic fenders float on the water.
They automatically adjust to:
- Changing tide levels
- Different vessel sizes
- Vessel movement during transfer
This flexibility makes them ideal for offshore operations.
Proven Reliability
Pneumatic fenders are widely used for:
- Öltankschiffe
- LNG carriers
- LPG vessels
- FPSOs
- Offshore-Plattformen
The technology has been tested in demanding marine environments around the world.
Installation and Deployment
The project team developed a detailed deployment plan before operations began.
First, each pneumatic fender was inspected and inflated to the required pressure.
Next, the Chain and Tire Net protection system was checked to ensure it could withstand repeated contact.
The fenders were then positioned along the expected contact area between the two vessels.
Additional fenders were installed near the bow and stern to improve protection coverage.
Before every transfer operation, the crew completed routine inspections of pressure levels, chains, shackles, and net systems.
This preparation helped ensure consistent performance throughout the project.
Results After Deployment
Collision Risk Reduced by Approximately 80%
Following the installation of pneumatic fenders, the operator conducted an internal risk assessment.
The assessment showed that the probability of direct hull contact was reduced by approximately 80% compared with previous operations.
The reduction came from:
- Increased separation distance
- Better energy absorption
- Improved vessel protection
- More stable berthing conditions
No Structural Damage During the Project
Throughout the operation period:
- No hull damage was reported
- No coating damage was recorded
- No repair work was required
The vessels completed transfers without structural incidents.
Improved Crew Safety
Crew members reported more stable vessel positioning during transfer operations.
As a result:
- Fewer mooring adjustments were needed
- Deck operations became easier
- Safety monitoring workloads decreased
This created a safer environment for personnel working on board.
Higher Operational Efficiency
The operator also noticed operational benefits.
Compared with previous projects:
- Fewer inspections were required
- Fewer transfer interruptions occurred
- Downtime was reduced
These improvements helped increase overall productivity.
Why More Operators Are Choosing Pneumatic Fenders
As vessel sizes continue to increase, operators need reliable protection systems that can handle higher berthing energy.
Pneumatic fenders offer several advantages:
- Hohe Energieabsorption
- Geringe Reaktionskraft
- Lange Lebensdauer
- Einfache Installation
- Adaptability to offshore conditions
- Compliance with international standards
For many tanker operators, these benefits make pneumatic fenders one of the most practical solutions available.
Could Your Operation Face Similar Risks?
Many operators encounter the same challenges as this client.
You may benefit from pneumatic fenders if your operations involve:
- Schiff-zu-Schiff-Transfers
- Öltankschiffe
- LNG carriers
- Offshore terminals
- FPSOs
- High-value cargo transfers
- Rough weather conditions
Choosing the correct fender size and configuration can significantly improve safety and reduce operational risks.
Abschließende Überlegungen
For this offshore tanker operator, pneumatic fenders provided more than simple vessel protection.
They helped reduce collision risks, improve crew safety, prevent potential damage, and support smoother operations.
As offshore transfer activities continue to grow, investing in reliable fender systems becomes increasingly important.
A properly designed pneumatic fender solution can protect vessels, crews, cargo, and the environment while helping operators maintain efficient and safe operations.