Watertight Door
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Weather tight Door
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A watertight
door prevents the passage of water when exposed to head of water. A typical
head of water for a ship could range from 3-10 meters(tested up to 20 meters
resistance)
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A weather tight door is designed to be located on the deck of the
ship above the waterline, where they can be subject to the adverse weather
conditions experienced offshore.
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Watertight doors
are tested using a pressure tank where a hydrostatic pressure can be applied
to the door.
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Weather tight doors are also designed to withstand brief submersion
experience from green seas. This means a weather tight door can withstand a
small head of water(generally no higher than the height of the door)
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The door is
generally pressurized form the inside as this is worst case scenario.
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A weather tight door is generally tested with a high pressure hose,
which is directed at the seal.
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Merchant ships have a marking on their hull know as the Plimsoll line or the Plimsoll mark, which indicates the limit until which ships can be loaded with enough cargo, internationally, the Plimsoll line on a ship is officially referred to as the international load line. Every type of ship has a different level of floating and the Plimsoll line on a ship generally varies from one vessel to another. All vessels of 24 meters and more are required to have this Load line marking at the centre position of the length of summer load water line. There are two types of Load line markings:- Standard Load Line marking – This is applicable to all types of vessels. Timber Load Line Markings – This is applicable to vessels carrying timber cargo. These marks shall be punched on the surface of the hull making it visible even if the ship side paint fades out. The marks shall again be painted with white or yellow colour on a dark background/black on a light background. The comp
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