ARL Repair / ARS Salvage
A salvage ship is a ship used to salvage sunken ships and objects. There are diving, compressed air, electric welding cutting, repairing and drainage equipment. Salvage ship is used to salvage underwater shipwrecks, submarine activities, air and sea flying aircraft, missiles, which may have sunk deep into the sea. Missiles, aircraft, warships and various ships that sink into the sea, some contain important military secrets, some contain precious cultural relics and gold and silver treasures, and some are secrets of their own structure, thus salvaging these wrecks and sinking Things, both military and economically important.
On general salvage ships, there are deck decompression chambers, rescue winches, etc., and some also have retractable submersible bells or deep submersibles. The salvage vessel cooperates with barges, tugs and buoys to carry out salvage operations. The salvage boats vary in size from a few hundred tons to a few thousand tons. The length ranges from tens of meters to more than 100 meters; the salvage depth ranges from 100 meters to five, six hundred meters, and even deeper.
In addition to underwater cutting and welding equipment for machine cutting, oxygen arc cutting, combustion cutting and explosive cutting, the salvage ship is also equipped with a variety of underwater communication equipment. Because seawater has a strong ability to absorb electric waves, wired telephones and ultrasonic communication are generally used under the sea. The wired telephone device is simple and reliable, but it has to be towed with wires to affect the operation. Ultrasonic waves are more suitable for use in seawater, but the communication distance is only a few hundred meters.
The salvage vessel is also equipped with mooring positioning system, air compressor, oxygen cylinder, high pressure water pump, submersible pump and other equipment. Relying on these equipment, salvage vessels can complete deep sea salvage and rescue missions.
According to the application, it is divided into inland salvage vessels and marine salvage vessels. Inland river salvage ship are small salvage ship with a displacement of 20 to 200 tons. It is only equipped with booms, winches and simple diving equipment for salvage of rivers, lakes and sunken ships. Marine salvage vessel are large salvage vessel with a displacement of several hundred tons or even more than one thousand tons, generally equipped with large lifting equipment, as well as diving, air compressor, underwater electric welding, underwater cutting, water pump, towing machinery, etc.
Salvage boats usually have the following salvage methods:
- float type: it sinks the watertight buoy and sinks to the bottom of the sea, and is connected with the shipwreck in a proper form and then discharges the seawater in the float with compressed air, and floats out of the water together with the shipwreck by its buoyancy.
- Lifting type: The hull is tied to the bottom of the ship with a number of steel cables, and the shipwreck is lifted by the floating crane. Since the shipwreck is often trapped in the seabed sediment, a high-pressure water pipe is required to punch a passage at the bottom, and the pumped mud water is pumped out to facilitate the diver's cable-carrying work.
- plastic filling: This is filled with foamed plastic in the immersion tank of the shipwreck . After the foamed plastic is foamed, the water accumulated in the tank can be discharged, and the buoyancy generated causes the boat to float.
- Metal cylinder type: The special metal cylinder is submerged under water and placed above the shipwreck. After the fuse is ignited, the fluxing material in contact with the metal cylinder and the wreck is welded to the surface of the wreck, and then the metal cylinder is lifted by the lifting device. Lift to the surface with the shipwreck.
Salvage vessels have many characteristics. First, the salvage vessel is shallow and accurate. There are as many sheaves as possible, and a wider deck can be used to arrange booms, winches and large lifting equipment. Second, the speed is high and the seakeeping is good. It can be quickly driven to the salvage waters and put into salvage work as soon as possible. Third, there is a large enough cargo capacity to store salvage equipment, and some salvage vessels are also equipped with stealth, as well as equipment for locking speed and salvage equipment.
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