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Encyclopedia > Dry dock
U.S. Navy submarine USS Greeneville in dry dock following collision with a fishing boat.
U.S. Navy submarine USS Greeneville in dry dock following collision with a fishing boat.

Contents

Original caption: The USS Greeneville (SSN 772) sits atop blocks in Dry Dock #1 at the Pearl Harbor Naval Shipyard and Intermediate Maintenance Facility, Pearl Harbor, Hawaii, on Feb. ... Original caption: The USS Greeneville (SSN 772) sits atop blocks in Dry Dock #1 at the Pearl Harbor Naval Shipyard and Intermediate Maintenance Facility, Pearl Harbor, Hawaii, on Feb. ... USS Greeneville (SSN-772), a Los Angeles-class submarine, was the only ship of the United States Navy to be named for Greeneville, Tennessee. ...


Types (for ships)

There are two types of drydock for ships:

  • graving dry dock
  • floating dry dock

Graving dry dock

A graving drydock in general is a concrete box with a door at the front. The dock is prepared for drydocking of the ship. The keel blocks as well as the bilge block are located on the floor of the dock in order to accommodate the ship. The blocks are placed in accordance with the "docking plan" of the ship. Subsequently the dock is filled with water. Now the ship floats in and after closing of the door, the water will be pumped away and the ship rests on his blocks. A graving dock is a multi purpose dock. It can be used for new building, for repair, and for maintenance.


As modern ships are just shoeboxes with a front and a backside, modern drydocks are just boxes, whereas in old drydocks, one often sees the shape of the ships that have to be drydocked. The advantage of this was that it was easier to build such a dock, secondly it was easier to (side) support the ships, and also less water had to be pumped away.

Enlarge
U.S. Navy ballistic missile submarine USS Michigan inside a flooded drydock

Some fine-tuning of the ship's position is done by scuba divers while there is still some water left to manoeuvre it about. Each ship will have a diagram of the shape of its bottom. It is extremely important that supporting blocks conform to this shape so that the ship is not damaged when its weight is supported by the blocks. Some ASW warships have protruding sonar domes, requiring that the hull of the ship be supported several meters from the bottom of the drydock. USS Michigan (SSBN-727) File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... USS Michigan (SSBN-727) File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... USS Michigan (SSBN/SSGN-727) is the second Ohio-class Nuclear Powered Fleet Ballistic Missile Submarine in the United States Navy. ... Early ideas of autonomous under-water systems appear in Twenty Thousand Leagues Under the Sea Scuba diving is the use of independent breathing equipment to stay underwater for long periods of time for recreational diving and professional diving. ... Anti-submarine warfare is a term referring to warfare directed against submarines. ... The F70 type frigates (here, La Motte-Picquet) are fitted with VDS (Variable Depth Sonar) type DUBV43 or DUBV43C tugged sonars SONAR (SOund Navigation And Ranging) â€” or sonar â€” is a technique that uses sound propagation under water to navigate or to detect other watercraft. ...


Once the remainder of the water is pumped out, people can walk around in the dry dock, and the ship can be freely inspected or serviced.


When work on the ship is finished, water is allowed to reenter the dry dock and the ship is carefully refloated.


Dry docks that are used for building Navy vessels may occasionally be built with a roof. This is done to prevent spy satellites from taking pictures of the dry dock and any ships or submarines that may be in it. During World War II covered dry docks were frequently used by submarine fleets to protect them from enemy air raids, however their effectiveness in that role diminished after the Second World War. Today covered dry docks are usually used only when servicing or repairing a fleet ballistic missile submarine. Another advantage of covered drydocks is that one can work independent of the weather. This can save considerable time. KH-4B Corona satellite Lacrosse radar spy satellite under construction A spy satellite (officially referred to as a reconnaissance satellite or recon sat) is an Earth observation satellite or communications satellite deployed for military or intelligence applications. ... Combatants Allies: • Soviet Union, • UK & Commonwealth, • USA, • France/Free France, • China, • Poland, • ...and others Axis: • Germany, • Japan, • Italy, • ...and others Commanders Strength Casualties Full list Full list World War II, also known as the Second World War, was a large scale military conflict that took place between 1939 and 1945. ...


Dry docks are usually excavated from dry land on the shore. The largest dry dock in the world is in Belfast, Northern Ireland. The oldest surviving dry dock (and the first in Europe) was commissioned by Henry VII of England at HMNB Portsmouth in 1495 (see The Tudors and the Royal Navy), though the Chinese had invented and used dry docks by at least 1070. A landform comprises a geomorphological unit. ... Belfast (Béal Feirste in Irish) is a city in the United Kingdom. ... Dieu et mon droit (Royal motto) (French for God and my right)2 Northern Irelands location within the UK Official languages None3 Main languages English, Irish, Ulster Scots Capital and largest city Belfast First Minister Office suspended Secretary of State for Northern Ireland Peter Hain MP Area  - Total Ranked... Henry VII (January 28, 1457 - April 21, 1509), King of England, Lord of Ireland (August 22, 1485 – April 21, 1509), was the founder and first patriarch of the Tudor dynasty. ... Portsmouth Naval Dockyard. ... 1495 was a common year starting on Tuesday (see link for calendar) of the Gregorian calendar. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... Events Hereward the Wake begins a Saxon revolt in the Fens of eastern England. ...


Floating drydock

The battleship USS Iowa uses a floating dry dock during World War II.
The battleship USS Iowa uses a floating dry dock during World War II.

A floating drydock is a salvage platform which has floodable buoyancy chambers in a "U" shaped cross-section that can support a ship. When valves are opened to fill the chambers with water, the dry dock floats lower in the water, allowing a ship to be moved into position inside. When the water is pumped out of the chambers, the dry dock rises and the deck is cleared of water, allowing work to proceed on the ship's hull. Such dry docks are often operated by a nearby shipyard, but can also be moved around the world as needed. Image File history File links Download high resolution version (900x661, 105 KB)Site states: These photos are arranged in chronological order and are believed to be all declassified official USN photos. ... Image File history File links Download high resolution version (900x661, 105 KB)Site states: These photos are arranged in chronological order and are believed to be all declassified official USN photos. ... HMS Victory in 1884 Battleship was the name given to the most powerfully gun-armed and most heavily armored warships between the 15th and 20th Centuries. ... USS Iowa (BB-61), the lead ship of her class of battleship, was the fourth ship of the United States Navy, but second to be commissioned, to be named in honor of the 29th state. ... Combatants Allies: • Soviet Union, • UK & Commonwealth, • USA, • France/Free France, • China, • Poland, • ...and others Axis: • Germany, • Japan, • Italy, • ...and others Commanders Strength Casualties Full list Full list World War II, also known as the Second World War, was a large scale military conflict that took place between 1939 and 1945. ... Salvage is the process of rescuing the hull, equipment or cargo of a shipwreck or abandoned vessel. ... In physics, buoyancy is an upward force on an object immersed in a fluid (i. ... For the computer software/games company, see Valve Software A valve is a device that regulates the flow of fluids (either gases, fluidised solids, slurries or liquids) by opening, closing, or partially obstructing various passageways. ...


Floating drydocks were used extensively during the Second World War to provide maintenance in remote locations. Several of these docks could be joined to accommodate a long ship.
Mushroom cloud from the nuclear explosion over Nagasaki rising 18 km into the air. ...

Floating drydock in Singapore
Floating drydock in Singapore

Image File history File linksMetadata Download high resolution version (2048x1536, 2120 KB) Dry Dock in Singapore. ... Image File history File linksMetadata Download high resolution version (2048x1536, 2120 KB) Dry Dock in Singapore. ...

Other ways of drydocking ships

Apart from graving docks and floating drydocks, ships can also be drydocked and launched by:

  • Mobile boatlifts (also called Travelifts, up to say 250 tons weight)
  • Slipways, For repair of smaller boats and the newbuilding launch of larger vessels
  • Marine Railways for repair of larger ships up to say 3000 tons ship weight
  • Shiplifts for repair as well as for newbuilding. From 800 to 25000 ton shipweight

A slipway is basically a ramp on the shore of a river or estuary that is used for the building or reparing of ships or boats. ...

Uses other than for ships

Some drydocks are used for the construction of large objects such as parts of bridge or dams. For example the drydock of Neeltje-Jans was used for the construction of the Oosterscheldekering, a large dam in the Netherlands that consists of 62 concrete pillars weighing 18000 tonnes each. The pillars were constructed in a drydock and towed to their final place on the seabed. This drydock however was just a piece of seabottom, surrounded by a dike and was flooded by piercing the dike. Neeltje-Jans is a artificial island in the Netherlands in the province of Zeeland, halfway between Noord-Beveland and Schouwen-Duiveland in the Oosterschelde. ... The Oosterscheldekering (Eastern Scheldt storm surge barrier), between the islands Schouwen-Duiveland and Noord-Beveland, is the largest of 13 ambitious Delta works series of dams, designed to protect a large part of the Netherlands from flooding. ...


See also


  Results from FactBites:
 
Process: Dry Docking and Launching (404 words)
In dry docking, a ship is removed from the water to enable work to be performed on the exterior part of the ship below the waterline.
To prepare the dry dock, keel blocks are set into position and lines and men to handle the vessel are readied.
Injuries, fatalities associated with overturning ship during dry docking and launching operations - catastrophic accidents are unlikely, provided that appropriate procedures are followed.
Dry dock Information (858 words)
A graving dry dock is a narrow basin, usually made of earthen berms and concrete, closed by gates or by a caisson, in which a vessel may be floated and the water pumped out, leaving the vessel supported on blocks.
The first dry dock in Europe, and the oldest surviving dry dock, was commissioned by Henry VII of England at HMNB Portsmouth in 1495 (see The Tudors and the Royal Navy).
The largest dry dock in the world is in Belfast, Northern Ireland measuring 556m by 93m, with a capacity of 1.2million tonnes.
  More results at FactBites »

 
 

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