How to Choose Ship Launching Airbags

What Are Ship Launching Airbags?

Ship launching airbags—also known as marine airbags or pneumatic launching airbags—are high-strength rubber cylinders used to launch, land, or move vessels safely. They’ve become a popular alternative to traditional dry docks or slide rail systems due to their flexibility, portability, and cost-effectiveness.

Why Choosing the Right Airbag Matters

Selecting the right ship launching airbag isn’t just about numbers—it’s about ensuring the safety of your vessel, your crew, and your budget.

Let’s say a shipowner chooses a smaller or low-pressure airbag to save costs. During launch, the airbags compress unevenly, and the hull dips unexpectedly. Now there’s damage to the bottom plate, delays in delivery, and unplanned repair costs. All of this could have been avoided with a more thoughtful decision.

That’s why making the right choice early on is critical to a smooth, safe, and cost-effective launch.

How to Choose Ship Launching Airbags

At NANHAI, we know this is one of the top concerns for shipowners:
“How do I select airbags that are both safe and economical?”

Based on years of experience, we recommend you consider three key factors when choosing ship launching airbags:

1. Specify the Maximum Working Pressure

The maximum working pressure is crucial for determining the airbag’s load-bearing capacity. It must support the full weight of the ship during the launch without deformation or bursting. When placing an order, always communicate your pressure requirements clearly to the supplier.

2. Choose the Right Ship Launching Airbag Diameter

Airbag diameter is measured when fully inflated, without compression. It should be based on the size and weight distribution of the hull. Common sizes are available, but custom diameters can also be requested for non-standard vessels. For larger ships, larger diameters help evenly distribute the load and reduce pressure per unit area.

3. Decide on the Effective Working Length

The working length refers to the inflated, cylindrical body of the airbag, excluding cone heads or flat ends. This size should match your launching needs. Most manufacturers (like NANHAI) provide lengths starting at 3x the diameter and going up to 20 meters. Always consult with the supplier to find the right match based on your ramp length and vessel size.

Other Factors to Consider

Material Quality & Manufacturing Standards

Look for airbags made from high-tensile, wear-resistant rubber, reinforced with multiple layers of synthetic-tire cord. Reputable suppliers like NANHAI offer ISO-certified products and conduct pressure tests before delivery.

Reusability & Lifespan

Ask about how many launches an airbag can handle. High-quality products often allow more than 70 uses if maintained properly.

Launching Environment

Don’t forget to consider your local conditions—tidal variations, launch slope, surface smoothness, and temperature can all impact airbag performance.

How to Compare Ship Launching Airbag Suppliers

When comparing suppliers, ask these questions:

• Do they offer custom sizing?
• Do they provide testing reports or certifications?
• What is their track record with similar ship types?
• Is there after-sales support or warranty?

At NANHAI, we support clients with technical drawings, installation guidance, and 1-on-1 consultation based on your vessel design and launching environment.

Common Mistakes to Avoid

• Using lifting airbags instead of launching airbags
• Selecting airbags that are too short or narrow
• Overinflating beyond the recommended pressure
• Not inspecting airbags before launch

Each mistake can lead to serious accidents, structural damage, or unnecessary downtime.

Conclusion: Choose Smart, Launch Safe

Choosing the right ship launching airbag is not just a technical step—it’s a decision that affects your project timeline, budget, and vessel safety.

With years of experience, NANHAI helps you select the right size, pressure, and material for your ship type and environment.

Contact us today to get expert advice or a customized quotation.

FAQ – Related Questions

What size airbag do I need for ship launching?

Choose based on the ship’s length, width, and tonnage. Typically, the working length should be 3–6 times the diameter.

How many airbags are required to launch a ship?

Most launches require at least 6–12 airbags, depending on vessel weight, length, and hull shape.

Can marine airbags be reused?

Yes, high-quality marine airbags like those from NANHAI can be reused over 50–100 times with proper care.

What is the difference between marine airbags and lifting airbags?

Marine launching airbags are designed for rolling and load-bearing during horizontal movement. Lifting airbags are typically flat and designed for vertical lifts.

Are pneumatic airbags better than dry dock systems?

For many mid-sized vessels, pneumatic airbags are cheaper, more flexible, and faster than fixed dry dock systems.