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Basic Information on Ships

Home PR Center Ship Story Basic Information on Ships

How Ship float
Why can ships that are made of steel float on the water? Buoyancy is what it makes a ship float. This is based on Archimedes Principle. A Greek scholar named Archimedes was given the order by the king to prove that his crown was made of pure gold. After obsessing for a few days over how he was going to prove it, Archimedes discovered the principle of displacement while stepping into a full bathtub. He realized that the water that ran out of the bath had an equal volume to the part of his body that was submerged.
This concept can be equally applied to ships. The force of buoyancy is equal to the weight of the water displaced by an object. The buoyant force on a submerged material is exerted in the opposite direction to gravity. The buoyant force is equal to the volume of the fluid that is displaced by the material; however, the wider the area that is touching the surface of the water, the better the material will float.
If the material in the water weighs less than the same volume of water, it will not submerge. This is because the buoyant force is larger than the weight of the material. Therefore, when a ship is made to weigh less than the water that it pushes aside, it will float.
How ship run
A ship starts when compressed air is supplied directly to the cylinder within the engine. When the ship starts, the propeller wing rotates, pushing water backwards and making the ship run forward in response. It operates on the same principle as a fan. The propeller of the ship has the same structure as a fan. The faster the propeller rotates, the greater the amount of water it can push back, and the stronger the ship will be propelled forward.
Once the engine has been started, it is difficult to reverse the ship. If the ship has to be reversed, the engine must first be stopped, and then reverse-rotated.
others
others
TEU(Twenty-FEET EQUIVALENT UNITS) This is the unit used to measure the size of container ships, and stands for Twenty-Foot Equivalent Units.
WS WORLDSCALE RATE This is an index designed to assess the freight rates of tankers. The world-scale rate for a particular route represents a voyage charter rate for a hypothetical 75,000 DWT tanker running at a 14-knot speed. It is considered to be in a boom when the WS of a VLCC is over 75.
DOUBLE HULL After the US oil tanker Exxon Valdez was stranded in Alaska in March 1989, severely polluting the ocean, the US instituted the Oil Pollution Act in 1990, which required all oil tankers operating in US territorial waters to have a double hull structure. A tanker with a double hull structure has a double wall within the tank, both vertically and horizontally, thus preventing oil leakage even when the external hull is breached.
panama canal Located in Panama, this canal connects the Caribbean Sea and the Pacific Ocean, and is 67 kilometers long and 32.32 meters wide. Ships that can pass through the canal must have a width of less of 32.24 meters (less than 50,000-80,000 DWT).
suez canal Located in Egypt, this canal connects the Mediterranean Sea and the Red Sea, and is 163 kilometers long and 195 meters deep. (Dredging work started in 1985. Prior to the start of dredging work, it was only 14.5 meters deep.) Limited to ships with a draft of less than 16.1 meters
1KNOT A knot is the unit of measurement of a ships speed. 1 knot is equivalent to a speed of 1,852 meters per hour
Shipbuilding production Terms
Shipbuilding production Terms
terms explanation
pre-utfitting The installation of various pipes, electrical wires, and devices at the internal and external parts of a block that is already assembled
block painting The elimination of foreign substances (such as rust and oil) on the surface of the steel of a block where pre-outfitting is completed
Pre Erection The enlargement of a block by gathering 2-3 blocks on which painting has already been completed around the dock
Erection The welding of the enlarged blocks, both automatically and manually, at the dock, thus making the form of the ship
Hull Painting The elimination of foreign substances generated in the connection part during loading, and the painting of the steel surface
Launching The floating of a ship whose form has been made through welding, and whose painting is completed
sea trial A trial at sea (of criteria such as speed, fuel consumption, etc.), as agreed in the contract
Naming An event to name a ship whose construction has been completed
Delivery The delivery of a ship to the client, whose functions have been confirmed as conforming to the contract