Evergreen Marine airbag ship launching process

Evergreen marine airbag is widely used in the ship building, ship repairing, oil and gas, marine salvage companies nowadays.
Now we are making a brief introduction of Evergreen airbag ship launching procedure as follows:
1. According to the calculation, prepare enough marine airbags, towing winch machine, air compressor and other instruments needed.
Before using, all airbag should be inflated with 1.25 time inner pressure of working pressure to test its safety and air tightness. If there is air leakage, it should be patched before using.
2. Clear all the obstacles and sharp iron nail from the slipway.
3. Check on the uneven scar caused by welding of heavy steel structure to ensure ship’s bottom is smooth.
4. Fasten towing winch with ship.
5. Close all the valves, fix the helm and screw propeller.
6. Take out all the wooden stands under the ship, insert rolling airbags. There are many ways to do it. Now we introduce two most used ways as follows. The user may choose one of them according to the weight of ship and quantity of marine airbags.
A. For the light weight ship, airbags can fully lift the ship and make it to detach with the wooden stands. Then it is easy to insert other airbags and remove the wooden stands.
B. For the heavy ship, we use airbags to lift the ship at the stern of ship. So we must find the best point for bow supporting point and lift airbag. From the figure, we can know the bow supporting point should near to ship’s transverse gravity center. But consider the workforce of removing wooden stands before bow supporting point we should select that point at a reasonable place. The lifting air bag should far away from the gravity center to get a bigger lift moment. Sometimes we have to consider the figure of ship’s bottom to decide the lifting point. In one word we should find the best lifting point to get the maximum lifting moment.

To lift the ship the following condition should be satisfied
Q•LQ〉W•LW
Q-bearing capacity
W-weight of ship
LQ-distance from lifting point to bow supporting point
LW-distance from gravity center to bow supporting point
C. First take out all the wooden stands in front of lifting airbag and bow supporting point. Insert the lifting airbag and start to inflate and stop charging as soon as the bottom of ship dispatch with the wooden stands. Then take out the wooden stands from the ship middle to stern, insert more airbags at planned positions. Repeat above process to remove all the wooden stands and place air bags.
In order to ensure the safety, we should insert some flexible wooden stands. When the air bags can lift the full weight of ship, we can take out these stands.

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