Qingdao Luhang Marine Airbag and Fender Co., Ltd
Qingdao Luhang Marine Airbag and Fender Co., Ltd We are devoted to supplying guaranteed marine airbags and fenders.
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Ship Lifting and Roller Rubber Marine Air Bag
Ship lifting and roller rubber marine air bags are widely used for ship launching and docking in shipyards, specially medium and small shipyards alongside rivers and seasides in Asian and American countries. Marine air bags are often called ship launching airbags that indicate the most popular application of these heavy duty airbags is for ship launching. It is estimated that more than 80 percent new built ships who’s DWT below 60,000 are launched by marine air bags.
Launching with marine air bags is flexible. Any flat ground with a little declining angle can be taken as a slip way. Airbags can sucessfully launch a ship even on a bank 1 or 2 meters over water level.
Construction of Ship Lifitng and Roller Rubber Marine Air Bags
1) As shown in the figure below, the rubber marine air bag has a cylindrical body and two conical heads, one at each end. The diameter and effective length can be customized according to the different jobs.
How to select marine rubber air bags for ship launching and docking
Ship launching airbags can be made into various sizes and layers accoding to the ship size and weight and the launching or docking conditions.
Effective length:
The effective length should be same as the ship breadth, or 1 meter shorter than the breath.
We can make airbags in length from 5m to 24m.
Diameter:
Select diameter based on the ship size and work requirement. Select bigger airbags for large ships, but smaller airbags for small boats. In case the ships need cleaning or repairing bottom, choose bigger airbags so that workers can work in a more comfortable posture under the ship. Diameter of 1.5m, 1.8m, 2m or 2.5m are all suitable and available for large ships.
The number of layers:
The more layers the airbag has, the bigger bearing capacity it has. To lift a ship to a certain height, enough airbags with enough layers are needed. Generally speaking, airbags with 6 layers are enough for most engineering works. Only in some rigorous situation, airbags will need 7-8 layers to enhance its performance. For example, if people use airbags to lift heavy caisson but their contact area is limited, and then airbags will need higher pressure and more plies to ensure the safety.
| Size | Diameter | 1.0m, 1.2m, 1.5m, 1.8m, 2.0m, 2.5m, 2.8m, 3.0m |
| Effective Length | 10m, 12m, 15m, 18m, 20m, 22m, 24m, etc | |
| Layers | 4 layers, 5 layers, 6 layers, 8 layers, 10 layers, 12 layers |
Good selection of marine airbags is vital for the success of marine projects. Get basic knowledge of marine airbags selection then consult with manufacturers can help people complete projects in shortest time.
Below is a chart for the bearing capacity of several sizes
| Model | Dia | Effective Length | Overall Length | Cord Layer | Rubber Plate | Thickness | Working Pressure | Bursting Pressure | Lifting Height | Bearing Capacity | |
| M | M | M | Layer | Layer | mm | MPa | MPa | M | Ton/meter | Ton/airbag | |
| LH-6 | 1.2 | 12 | 14 | 6 | 1 | 7.2 | 0.17 | 0.75 | 0.90 | 7.85 | 94.20 |
| 1.00 | 5.23 | 62.76 | |||||||||
| 1.10 | 2.62 | 31.44 | |||||||||
| LH-7 | 1.5 | 15 | 17 | 7 | 1 | 8.2 | 0.16 | 0.70 | 1.00 | 12.21 | 183.15 |
| 1.10 | 9.77 | 146.55 | |||||||||
| 1.20 | 7.33 | 109.95 | |||||||||
| 1.30 | 4.89 | 73.35 | |||||||||
| LH-8 | 1.8 | 18 | 20.5 | 8 | 1 | 9.2 | 0.15 | 0.67 | 1.20 | 13.96 | 251.28 |
| 1.30 | 11.63 | 15.12 | |||||||||
| 1.40 | 9.31 | 167.58 | |||||||||
| 1.50 | 6.98 | 125.64 | |||||||||
| 1.60 | 4.65 | 83.70 | |||||||||
| LH-10 | 2.0 | 20 | 23 | 10 | 1 | 11.2 | 0.17 | 0.75 | 1.30 | 18.32 | 366.40 |
| 1.40 | 15.70 | 21.98 | |||||||||
| 1.50 | 13.09 | 261.80 | |||||||||
| 1.60 | 10.47 | 209.40 | |||||||||
| 1.70 | 7.85 | 157.00 | |||||||||
In case you are not sure of the suitable sizes and sufficient layers of a launching project or ships, you are welcome to consult us for information. You need provide us with following information:
Ship size: breadth (width) and Length
Ship weight: weight of vessel without cargo is better
Lifting height: the maximum height to lift the ship from the ground
The slipway condition: the declining angel, the ground condition etc.
Please do not hesitate to send us any inquiry here, which will be answered as soon as possible.