Heavy lifting air bags, known as marine rubber airbags or ship launching balloons, are made of heavy-duty synthetic-tire-cord layers with inner and out rubber layers in a long cylindrical balloon shape.

The heavy lifting airbag is updated based on the ship launching airbags. This update makes heavy lifting airbags are more suitable for heavy lifting and moving work. Heavy lifting airbags have a different structure from the ship launching airbags. Not the simple other application of ship launching airbags. It can roll steadily when taking the load. The inferior heavy lifting airbags are easy to twist.

The heavy lifting airbag is one kind of the toughest pneumatic lifting airbag. It can be used for heavy lifting and moving of huge heavy structures, caisson, buildings, etc. The highest lifting capacity of each heavy lifting airbag can reach more than 1,000 tons.

Heavy lifting and transportation relying on heavy lifting airbags are cost-effective and flexible. Heavy lifting air bags will provide you with a unique capability of land transport very large vessels, heavy loads, or heavy construction over the ground where the terrain would otherwise prevent such an operation.

The deflated lifting rubber airbag is very flat and can be placed under a grounded or stranded vessel that is hard aground. As little as 12 inches will provide very quick placement of marine air bag under the hull.

We have wide heavy lifting airbags in capacities from 70 tons to over 1,000 tons per bag, when compress deformation reaches 70%. These heavy lifting airbags have a selection with a diameter of 0.8m to 3.0m, and 6m to 20m in length to cover virtually all applications.

Why Marine Heavy Lifting Air Bags
Superior Manufacturing & Quality Control Processes from the selection of raw materials to the highly skilled production process

Heavy Lifting Airbags Performance

Lifting Capacity Principle
The bearing capacity of ship launching airbags were calculated based on the working pressure, contact area. Herein, working pressure was got upon the burst pressure and safety working factor.

Because of the flexibility of rubber airbag, the contact area will be effected by some terms. It inludes carried shipcondition, the different position from gravity center during the process of ship launching and landing. So the bvearing capacity of rubber airbags will vary as well as the contact area.

The approximate bearing capacity can be calculate as follows:

F=PS S=π x (D-H)/2

Where:

F is the bearing capacity
P is the working pressure
S is the contact area
P is the percentage of deformation (%);
D is the original diamater of the air bag (m);
H is the height of the compressed air bag (m)

Performance Parameters of Heavy Lifting Airbags

Heavy Lifting Air Bags Classification
Our engineering team constantly improves the Structure of Typical Air Bags​

The standard heavy lifting airbags include the below spares. Ready for use.

1. The end of the airbag body
2. End flange (Q235 H.D.G)
3. Sealing Washer
4. Three-direction connector at the inflate end (Q235 H.D.G)
5. 3/4′ Ball Valves at the inflate end (Brass)
6. Hose connection at the inflate end (Q235)
7. High-quality Pressure Gauge
8. End plug at the tightness end (Q235 H.D.G)

Classification of Heavy Lifting Airbags
Heavy lifting airbags are categorized by the following three types according to the bearing capacity, per meter in length. We define the number of layers, which means the number of Synthetic-tyre-cord layers, in order to confirm the Safety Working Pressure. Another type is available upon clients’ request.

QP – Ordinary airbag – with 3, 4 or 5 layers of cord fabric.
QG – high-bearing capacity – with 6, 7, or 8 layers of cord fabric.
QS – Superhigh-bearing capacity air bag – with 9, 10, or more layers of cord fabrics as custom request.

For example: QG6/1.5×15
QG6: 6 layers cord fabric
1.5: diameter is 1.5m
15: length is 15m