Application area

Shipbuilding, Ship Repair, Industry.

Application 

The use of technology for launching and lifting ships on pneumatic air bags does not require large equipment costs, saves time and investment on the construction and repair of launching pads (slips).

For launching and lifting vessels on pneumatic bags it is necessary to create a plain sloping area, which can be made of coarse sand, fine gravel, cement, metal, wood and other materials. The area should have a slope towards the water and continue into the water to some depth. The slope of the surface depends on the dock weight of the vessels.

Special attention should be paid to cleaning the surfaces of the slip from foreign objects (metal, broken glass, nails and sharp objects etc.) that can damage the membrane bags.

Deflated bags are placed under the hull and inflated with compressed air. The distance between the bags is calculated depending on the dock weight, length and width of the vessel, but not more than 6 meters between their axes. To install the bag it is necessary to have space under the hull of the vessel - not less than 25 cm in height and width not less than half of the circumference of the bag.

Lowering or lifting is made on the bags as a kind of rollers. In case, the lowering can be uncontrolled and controlled. In the latter case, the lowering speed is controlled by a traction mechanism located in the head of the slip.

Pneumatic roller-bags during lowering or lifting change working height and have a high floating that the descent gives extra righting moment, gives buoyancy to the ship from the very beginning of launching and eliminates the overturning of the ship.

Flexibility of the pneumatic bag shell reduces the risk of damage to the hull and slip tracks during the descent. The required lifting height on the slipway is regulated by increasing or decreasing the pressure in the bags.

With correct operation, pneumatic bags are flexible, portable and reliable. The technology of launching and lifting vessels using pneumatic bags is an economical alternative to complex and expensive launching devices.

Selection of roller-bags

Input data for the selection:

1. Length of the hull.

2. Width of the hull.

3. Dock weight ship.

4. Installation height on keel blocks.

On the basis of these data the necessary quantity, diameter, layers of a roller bag are calculated.

When choosing bags, you should be guided by the data from the tables:

TABLE 1. Load capacity (carrying capacity) of the bags

TABLE 2. Weight of the bags

TABLE 3. Dependence of the maximum working pressure on the count of layers and diameter of the bag

TABLE 4. Volume of the bags

Complete 

The pneumatic valves

Pneumatic distributor

The roller-bags are complete with control units, which consist of a pressure gauge, a crane and an ringbolt to move the bag during operation

In coordination with the customer can be equipped with additional control units, additional gauges, ringbolts, hooks, slings, pneumococal and all necessary valves

Photo and video

Diplomas, certificates, acknowledgements