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Drydocks in the UK - Assignment Example

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The paper “Drydocks in the UK” looks at 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. Drydocks have been used for the construction, maintenance, and repair of water vehicles…
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Drydocks in the UK
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Download file to see previous pages According to the April issue of Maritime, the largest dry dock in the world is now located at Ulsan, South Korea. It was described by the article as :
490 meters (1,600 feet) long, 115 meters across and 13.5 meters deep, Hyundai has announced that it now has the world’s largest drydock. Imagine an area roughly the size of 7 soccer fields and that is what you would see at the new H-Dock in Ulsan, South Korea. The dock is custom designed to build floating production storage and offloading (FPSO) vessels and includes two 1,600ton goliath cranes. Traditionally FPSO’s hull sides and topside are built separately. The hull is built in a shipbuilding drydock and then transported to a quay for topside installation. This method is time-consuming and makes the use of a crane very difficult.
Because of this, Hyundai received a staggering $1.6 Billion for the project commissioned by the Elf Petroleum Nigeria Ltd. However, the more important achievement is the ability to utilize the H-Dock type which boosts efficiency by 15% thereby shortening the project by as much as one month.
The first type of drydock ( known also as the graving dock ) is simply a narrow basin constructed out of concrete. Gates or caisson are used to close the drydock when a vessel is floated whenever water is pumped out. Caisson is actually watertight structures that have been used in geotechnical engineering to aid in the construction of a dam, lay foundation of a bridge, or ship repair. There are different types of caisson also such as shallow caisson or pneumatic caisson which can be used depending on the purpose.
Blocks of different types such as keel blocks and bilge blocks are laid on the floor as determined by the “docking plan”. It must be emphasized however that not all dry docks have the same function – it can be used to repair the ship or building humongous ships. In the military, such as the Navy, dry docks have served one crucial purpose: repair ships that have been damaged in battle. Many dry docks have found their place in history for they were instrumental during a war example of which is the St. Nazaire Raid in World War II.
Another type of dry dock is known as the marine railway. In this type, the blocks are mounted on a skid which is lowered into the water using rails. Chains or line bring up the skid with the vessel on the blocks. Interestingly, past types of dry dock used horses to provide power for the railway. As compared to graving docks or floating docks, this type has less lifting power. Currently, modern dry docks are box-shaped so as to accommodate the box designs of modern ships. This box shape has a lot of advantages since it is easier to construct, support on the sides and require less water that had to be pumped. ...Download file to see next pagesRead More
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