مصدات يوكوهاما 50 كيلو باسكال مقابل 80 كيلو باسكال

If you’ve ever searched for مصدات يوكوهاما, you’ve probably noticed two common ratings: 50 كيلو باسكال و 80 كيلو باسكال. At first glance, they look the same. Both are pneumatic fenders, both are designed to protect ships during berthing or ship-to-ship (STS) transfers, and both comply with ISO 17357 1:2014 و ISO 17357 2:2014 المعايير.

So, why do we have two pressure classes? And which one is right for your project? Let’s break it down in simple terms.

Quick Comparison Table

What Does “kPa” Mean Anyway?

ال kPa rating tells you the initial internal pressure of the درابزين هوائي. A 50 kPa Yokohama fender starts with 50 kilopascals inside, while an 80 kPa Yokohama fender starts at 80.

Higher pressure gives the fender better امتصاص الطاقة (EA) و shape stability. However, it also leads to a higher reaction force on both the ship and berth structure. That’s why your choice should always match your طاقة الرسو calculations and hull pressure limits.

Performance Differences You’ll Notice

1. Energy Absorption (EA)

This is the biggest difference. At the same size, an 80 kPa fender can absorb more energy than a 50 kPa model. That means if your ships are heavy or your approach speeds are high, 80 kPa is safer.

2. Reaction Force

Higher internal pressure also means more push-back. If your berth structure or hull plating has strict pressure limits, a 50 kPa fender might be safer.

3. Fender Size

Here’s the interesting part: for the same EA requirement, you can often downsize when you choose 80 kPa. Smaller fenders are easier to handle and sometimes cheaper to ship.

Cost, Logistics & Maintenance

• التكلفة الأولية → 80 kPa models are usually more expensive, but you might need a smaller size, which can offset the cost.
• Handling → Downsizing an 80 kPa yokohama fender makes it lighter and easier to move, but otherwise, there’s little difference in installation.
• صيانة → Both need pressure checks, but 80 kPa yokohama fenders are less forgiving if you skip them. Monthly checks are a good rule of thumb.

When to Choose 50 kPa vs 80 kPa

Choose 50 kPa if:

• You’re handling general cargo ships, bulk carriers, or container vessels
• The berth is in a sheltered port with mild sea conditions
• Budget is a concern
• You want lower reaction force on berth structures

Choose 80 kPa if:

• You’re doing STS transfers مع VLCCs, LNG carriers, or offshore operations
• The berth faces strong waves or currents
• Space is tight and you want a smaller fender with the same EA
• You need better shape stability under heavy loads

Safety and Standards Matter

Not all pneumatic rubber fenders are created equal. Always ask for:

• ISO 17357-1:2014 certification
• Performance curves for 50 kPa and 80 kPa ratings
• Third-party inspection reports

And remember: don’t overinflate a 50 kPa fender to 80 kPa. The layer design, reinforcement, and safety factors are different.

Step-by-Step Fender Selection Workflow

1. Understand your scenario → STS or STQ? Vessel types?
2. Calculate berthing energy → Based on ship size, speed, and tide.
3. Check hull and berth limits → Match EA and reaction force carefully.
4. Choose pressure class → Decide between 50 kPa and 80 kPa based on conditions.
5. Pick fender size → Use certified performance tables.
6. Select accessories → Nets, chains, swivels—ensure ratings match.
7. Plan maintenance → Set up a regular inspection schedule.

الأخطاء الشائعة التي يجب تجنبها

• Inflating a 50 kPa fender to 80 kPa (unsafe).
• Ignoring reaction force when upsizing or switching pressure classes.
• Using non-certified fenders without test reports.
• Skipping regular pressure checks—especially on 80 kPa units.

Real-World Examples

• STS LNG Transfer: 80 kPa fenders are preferred because of high berthing energy و tight stand-off limits.
• Container Berth in a Sheltered Port: 50 kPa is usually more than enough.
• Exposed Offshore Berth: 80 kPa provides better shape stability during swells.

الأسئلة الشائعة

Q1. Can I use a 50 kPa fender at 80 kPa?
No. They are designed differently and it’s unsafe.

Q2. Does 80 kPa always perform better?
Not always. It’s “better” for high-energy scenarios, but comes with higher reaction force and stricter maintenance.

Q3. Will 80 kPa reduce my fender size?
Yes, often you can pick a smaller diameter to meet the same energy absorption.

Q4. How often should I check the pressure?
على الأقل once a month or before major STS operations.

الأفكار النهائية

عندما يتعلق الأمر ب مصدات يوكوهاما, there’s no universal “better” option between 50 كيلو باسكال و 80 كيلو باسكال. The right choice depends on your ship size, طاقة الرسو, environmentو budget.

If you’re unsure, always ask your fender supplier for ISO-certified performance curves and let the numbers guide you. The wrong choice can mean higher costs—or worse, structural damage.