Stability conditions (watercraft)

Stability conditions (watercraft)

Stability conditions (watercraft) is the term used to describe the various standard loading configurations to which a ship, boat, or offshore platform may be subjected. They are recognized by classification societies such as Lloyd's Register, American Bureau of Shipping (ABS) and Det Norske Veritas. Classification societies follow rules and guidelines laid down by SOLAS conventions, the International Maritime Organization and laws of the country under which the vessel is flagged, such as the Code of Federal Regulations.

Stability is normally broken into two distinct types: Intact and Damaged

Intact stability

The vessel is in normal operational configuration. The hull is not breached in any compartment. The vessel will be expected to meet various stability criteria such as GMt(metacentric height), area under the GZ (righting lever) curve, range of stability, trim, etc.

Intact conditions

Lightship

The vessel is complete and ready for service in every respect, including permanent ballast. All normally flooded spaces such as sea chests are considered but the vessel has no cargo, crew, provisions, ammunition or any other load item.

Light Operating or Light Displacement

Along with all the Lightship loads, the vessel has all systems charged meaning that all fresh water, cooling, lubricating, hydraulic and fuel service header tanks, piping and equipment systems are filled with their normal operating fluids. Crew and effects are at their normal values. Consumables (provisions, potable water and fuel) are at 10% full load. Ammunition and/or cargo is not included (0% of full load).

Full Load Departure or Full Displacement

Along with all the Lightship loads, the vessel has all systems charged meaning that all fresh water, cooling, lubricating, hydraulic and fuel service header tanks, piping and equipment systems are filled with their normal operating fluids. Crew and effects are at their normal values. Consumables (provisions, potable water and fuel) are at 100% capacity. Ammunition and/or cargo is at maximum capacity. The vessel is at its limiting draft or legal load line.

tandard Condition

This is only for military vessels. Along with all the Lightship loads, the vessel has all systems charged meaning that all fresh water, cooling, lubricating, hydraulic and fuel service header tanks, piping and equipment systems are filled with their normal operating fluids. Crew and effects are at their normal values. Consumables (provisions, potable water and fuel) are at 50% capacity. Ammunition and/or cargo is at 100% capacity. This condition is normally used for range and speed calculations.

Light Arrival

Along with all the Lightship loads, the vessel has all systems charged meaning that all fresh water, cooling, lubricating, hydraulic and fuel service header tanks, piping and equipment systems are filled with their normal operating fluids. Crew and effects are at their normal values. Consumables (provisions, potable water and fuel) are at 10% full load. Ammunition and/or cargo is at 100% capacity.

Damaged stability

* Damaged: The vessel in the assessed "Worst Intact Condition" is analytically damaged by opening various combinations of watertight compartments to the sea. The number of compartments and their location are dictated by IMO regulations, SOLAS conventions, or other applicable rules. Typically these conditions are identified by the compartment(s) damaged ex: "Hold #3 and Water Ballast Tank 4 Port"

ee also

*Naval architecture
*Hull (watercraft)
*SNAME
*Instantaneous stability

References

External links

* [http://www.nvr.navy.mil/def_ld.htm nvr.navy.mil, definitions]


Wikimedia Foundation. 2010.

Игры ⚽ Нужен реферат?

Look at other dictionaries:

  • Ship stability — is an area of Naval Architecture and ship design that deals with how a ship behaves at sea, both in still water and in waves. Considerations are made as to the center of gravity and center of buoyancy of vessels and how they interact. History… …   Wikipedia

  • Watercraft rowing — Rowing in the Amstel River by a student rowing club. Watercraft rowing is the act of propelling a boat using the motion of oars in the water. The difference between paddling and rowing is that with rowing the oars have a mechanical connection… …   Wikipedia

  • Hull (watercraft) — Half hull of the 46 gun ship of the line Tigre, build from 1724 in Toulon after plans by Blaise Coulomb A hull is the watertight body of a ship or boat. Above the hull is the superstructure and/or deckhouse, where present. The line where the hull …   Wikipedia

  • List (watercraft) — A heavily listing ship, the Ivory Tirupati, heading for the port of Brest in France The angle of list is a term used to describe the degree to which a vessel heels (leans, or tilts) to either port or starboard. [1] …   Wikipedia

  • Waterline — refers to an imaginary line marking the level at which ship or boat floats in the water. To an observer on the ship the water appears to rise or fall against the hull . Temperature also affects the level because warm water provides less buoyancy …   Wikipedia

  • Bilge keel — protection system.A bilge keel is often in a V shape, welded along the length of the ship at the turn of the bilge. Bilge keels are employed in pairs (one for each side of the ship). A ship may have more than one bilge keel per side, but this is… …   Wikipedia

  • Kayak — A kayak is a small human powered boat. It typically has a covered deck, and a cockpit covered by a spraydeck. It is propelled by a double bladed paddle in the hands of a sitting paddler. The kayak was used by the native Ainu, Aleut and Eskimo… …   Wikipedia

  • Canoe — A canoe is a small narrow boat, typically human powered, though it may also be powered by sails or small electric or gas motors. Canoes usually are pointed at both bow and stern and are normally open on top, but can be covered. In its human… …   Wikipedia

  • Naval architecture — Tahitian Princess in Tórshavn, Faroe Islands, August 2009 Naval architecture is an engineering discipline dealing with the design, construction, maintenance and operation of marine vessels and structures.[1] …   Wikipedia

  • Multihull — and monohull ship layouts A multihull is a ship, vessel, craft or boat with more than one hull. Contents 1 Description …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”