When the ship navigates in shallow water, it will produce shallow water effect, and the resistance will become larger, resulting in the sinking of the hull, the aggravation of the wave, and even the boat will overturn. When some deep-draft ships have limited draft and cannot ride the tide fully, the airbag device can be used to float the ship and pass the channel with insufficient water depth. In the lower reaches of the Yangtze River in Jiangsu Province, there are many sand boats and barges with low freeboard. If there is a little wind and waves on the river, the ship will be in danger of sinking. The air bag device can provide the barge with reserve buoyancy, which is released into the water when the sailing environment is harsh, increasing the ship's buoyancy and stability, and reducing the risk of accidents.

Stranding means that the ship can not sail if it is placed on an obstacle, and it is a state other than sailing, anchoring and berthing. Obstacles include reefs, shoals, sunken ships and other underwater objects that hinder the navigation of ships. After the ship ran aground, it was unable to leave the shallow water on its own. Airbags can be placed around it to inflate the airbags to provide buoyancy, reduce the depth of the boat's draft, and with the help of the airbag device, take it out of the shelving position. When a ship is placed on a shallow bank or reef, the invention can provide buoyancy and support for the ship, prevent the ship from tilting and causing secondary damage to the hull, and assist the ship to get out of the shallow water. At the same time, in the sea or port waters, if the two ships collide or other reasons cause the ship to be damaged and enter the water, and cannot maintain a stable upright floating, the air bag device can effectively make up for the buoyancy loss of the ship's cabin damage, so that the ship can help itself leave the accident waters as soon as possible with less external assistance to avoid traffic congestion in the waters.

Air bag devices have many unique advantages when used to assist ship navigation and rescue Marine accidents:

(1) The air bag device is the launching vehicle of our ship. Chinese scholars and experts have studied the manufacture and application of airbag devices for many years, and the theory and technology of new ship launching technology can be successfully transplanted to assist ship navigation and wreck salvage.

(2) Marine air bag maintenance manufacturers believe that the installation of air bag devices on merchant ships or engineering ships can increase the stability of its navigation on the rough sea, reduce navigation risks, and provide a more comfortable sailing environment for passengers and crew.

(3) The air bag device can increase the buoyancy of a deep-draft ship, reduce its draft, and make it safely pass through a water-restricted channel. For stranded or broken ships, the air bag device can provide reserve buoyancy, maintain the stability of the ship, make the ship escape independently, and save the required manpower and material resources.

(4) In wreck salvage, the air bag device can effectively make up for the defects of steel float and soft float, and can be used as a substitute for steel float or as an auxiliary means to correct the floating state of the wreck; At the same time, the air bag device provides a solution to control the floating speed of the shipwreck and ensure the safety of the floating ship.