Anti High Pressure Anti Aging Ship Lifting Airbags
Product Introduction:
The history of heavy lifting airbag dates back to 1981. Xiao Qinghe ship repair and building shipyard, located in Jinan city of Shangdong Province, launched a 60 DWT tank barge with airbag suspension on January 20, 1981. Seven airbags were deployed in that project. One was 2 meters in diameter and 6 meters long and used for elevating. The remaining six airbags were 0.8 meters x 6 meters long and acted as the rollers. The first intention of that trial launch was to develop a prompt, less landform limited ship launching method for warfare purposes.
How has the technology advanced since then?
Over the past twenty years, the airbag ship launching system has made advancements in not only the airbag, but also the ship launching/landing technology. The first generation airbags used a rubber dipped canvas as a reinforcement layer to form the air chamber trunk. Two cone-shaped molds were then used to make the ends and everything was stuck together.
With today’s airbags, the whole-enlacing-technology used for manufacturing is done together. Rubber dipped synthetic-tyre-cords are used as the reinforcement layers with the trunk and two cone-shaped ends made at the same time. Everything is then-laced together, so the airbag doesn’t have any joints. Due to the development of rubber chemistry, the performance of the rubber employed in the latest airbags is highly enhanced and about 15 times that of the first generation bag with the same specifications.
The launching and landing technology has also developed. In the beginning, only small and flat bottom ships located on a fabricated slope could be launched with airbags. Now this technology is more flexible and less limited by the ship and landform. Now any type of ship with a DWT below 55,000 and in a place with enough launching space can be launched using airbags. The launching slope even can be sloped upward. It has really developed into a cutting edge technology for launching ships, and especially useful for some marine emergencies.
The Heavy Lifting Airbag:
Structure of Marine Airbag
1. Terminal iron
2. Cone airbag body
3. Cylindrical airbag body
D: Diameter of airbag
L: Valid length of airbag
Loa: Total length of airba
Specifications:
| Some common sizes of our heavy lifting airbags, customized sizes are also available |
| Diameter(m) | Effective Length(m) | Layer | Pressure(MPa) |
| 1.0 | 10 | 5~6 | 0.07~0.10 |
| 1.0 | 12 | 5~6 | 0.07~0.10 |
| 1.0 | 15 | 5~6 | 0.07~0.10 |
| 1.2 | 10 | 5~6 | 0.08~0.12 |
| 1.2 | 12 | 5~6 | 0.08~0.12 |
| 1.2 | 15 | 5~6 | 0.08~0.12 |
| 1.5 | 12 | 5~8 | 0.08~0.16 |
| 1.5 | 15 | 5~8 | 0.08~0.16 |
| 1.5 | 18 | 5~8 | 0.08~0.16 |
| 1.5 | 20 | 4~8 | 0.08~0.16 |
| 1.5 | 24 | 5~8 | 0.08~0.16 |
| 1.8 | 12 | 5~8 | 0.08~0.15 |
| 1.8 | 15 | 5~8 | 0.08~0.15 |
| 1.8 | 18 | 5~8 | 0.08~0.15 |
| 1.8 | 20 | 5~8 | 0.08~0.15 |
| 1.8 | 24 | 5~8 | 0.08~0.15 |
| 2.0 | 18 | 6~10 | 0.08~0.18 |
| 2.0 | 20 | 6~10 | 0.08~0.18 |
| 2.0 | 24 | 6~10 | 0.08~0.18 |
| 2.5 | 18 | 7~10 | 0.07~0.13 |
| 2.5 | 20 | 7~10 | 0.07~0.13 |
| 2.5 | 24 | 7~10 | 0.07~0.13 |
Instruction of Airbags Application in Boat Docking
1. Fasten the hull with the steel cable of traction winch.
2. Fill in one or several airbags in the optimum position of the prow bottom. After inflating, the prow shall be lifted to certain height so that the ship can be moved forward by the traction of winch. For ships with flat bottom such as barge and so on, the contacting are between airbags and the bottom is large, if the ship is light, the prow can be lifted by one airbag filled in from the prow. For ships which are difficult to feed in the airbags such as pontoon and so on, the airbags can be threaded from one side to another. If the ship is too heavy, add 1 to 2 or more airbags at certain interval until the prow can be lifted. As to power-driven ship with “V” shaped prow, the airbags must be moved to backward as the lift if not enough due to the small contacting area between the airbags and bottom of ship. Sometimes, the airbags must to be moved backward 1/4 of the length of ship to lift the prow. During being moved backward, precaution shall be taken to prevent scratching on the airbags by the stem. A “V” shaped groove can be dug firstly if possible so as to increase the contacting area between the airbags and the bottom. The coastal shipyard can bury the airbag in proper location during the low tide and pull the ship to where the airbags locate. Inflate the airbags and the ship will be lifted easily. Anyway, the shipyard may adopt applicable methods based on its own conditions.
3. Start the winch to move the ship. Feed the airbags gradually in accordance with the requirement of arrangement space until the ship is pulled to the slipway.
4. Lift ship with the help of crane, construct hard block, pad ship and remove the airbags.
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