Difference between dry dock and wet dock pdf

Docks are enclosed areas for berthing the ships to keep them afloat at a uniform level to facilitate loading and unloading cargo. Dry docks. These are also known as harbor docks. Wet docks are large areas of water bounded by vertical solid walls against which vessels tie up. The walls may be formed by sinking monoliths to a suitable depth and joining them together with insitu concrete.

A dry dock sometimes dry-dock or drydock is a narrow basin or vessel that can be flooded to allow a load to be floated in, then drained to allow that load to come to rest on a dry platform. Dry docks are used for the construction, maintenance, and repair of ships, boats, and other watercraft. The use of dry docks in China goes at least as far back the 10th century A. At the beginning of the dynasty c. The upper works included several decks with palatial cabins and saloons, containing thrones and couches all ready for imperial tours of inspection. After many years, their hulls decayed and needed repairs, but the work was impossible as long as they were afloat. A large basin was excavated at the north end of the Chin-ming Lake capable of containing the dragon ships, and in it heavy crosswise beams were laid down upon a foundation of pillars.

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