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Template:RMS's deck

The upper deck of the Falls of Clyde is iron; a centre strip is planked with wood as a sort of walkway. As is typical for a late-19th-century vessel, several deckhouses may be seen.

A deck is a permanent covering over a compartment or a hull of a ship. On a boat or ship, the primary or upper deck is the horizontal structure which forms the 'roof' for the hull, which both strengthens the hull and serves as the primary working surface. Vessels often have more than one level both within the hull and in the superstructure above the primary deck which are similar to the floors of a multi-storey building, and which are also referred to as decks, as are specific compartments and decks built over specific areas of the superstructure. (Decks for some purposes have specific names; see below.)

Structure

The purpose of the upper or primary deck is structural, and only secondarily to provide weather-tightness, and to support people and equipment. The deck serves as the lid to the complex box girder which is the hull. It resists tension, compression, and racking forces. The deck's scantling is usually the same as the topsides, or might be heavier if the deck is expected to carry heavier loads (for example a container ship). The deck will be reinforced around deck fittings such as the capstan, cleats, or bollards.

File:QM2-wraparound-deck.jpg

Crew and passengers on the wraparound deck of RMS Queen Mary 2, an ocean liner.

On ships with more than one level, deck refers to the level itself. The actual floor surface is called the sole, the term deck refers to a structural member tying the ships frames or ribs together over the keel. In modern ships, the interior decks are usually numbered from the primary deck, which is #1, downward and upward. So the first deck below the primary deck will be #2, and the first above the primary deck will be #A2 or #S2 (for "Above" or "Superstructure"). However, ships may also call decks by common names, or (especially on cruise ships) may invent fanciful and romantic names for a specific deck or area of that specific ship, such as the Lido deck of the Princess Cruises' Love Boat.

Equipment mounted on deck, such as the ship's wheel, binnacle, fife rails, and so forth, may be collectively referred to as deck furniture. Weather decks in western designs evolved from having structures fore and aft (forward or front and aft or The Rear of the ship mostly clear, then in the 19th century pilothouses/wheelhouses and deckhouses began to appear, eventually developing into the superstructure of modern ships. Eastern designs developed earlier, with efficient middle decks and minimalist fore and aft cabin structures across a range of designs.

Common names for decks

Weather deck of the Swedish 17th century warship Vasa looking aft toward the sterncastle.

In vessels having more than one deck there are various naming conventions, numerically, alphabetically, etc. However, there are also various common historical names and types of decks:

<Berth deck>...</Berth deck>

• 01 level is the term used in naval services to refer to the deck above the main deck. The next higher decks are referred to as the 02 level, the 03 level, and so on. Although these are formally called decks, they are usually referred to as levels, because they are usually incomplete decks that do not extend all the way from the stem to the stern or across the ship. Potter or Ceramic Artist Truman Bedell from Rexton, has interests which include ceramics, best property developers in singapore developers in singapore and scrabble. Was especially enthused after visiting Alejandro de Humboldt National Park.<01 level>...</01 level>
• Berth deck: (Naval) A deck next below the gun deck, where the hammocks of the crew are slung.<Boat deck>...</Boat deck>
• Boat deck: Especially on ships with sponsons, the deck area where lifeboats or the ship's gig are stored.<Boiler deck>...</Boiler deck>
• Boiler deck: (river steamers) The deck on which the boilers are placed.<Bridge deck>...</Bridge deck>
• Bridge deck: (a) The deck area including the helm and navigation station, and where the Officer of the Deck/Watch will be found, also known as the conn (b) An athwartships structure at the forward end of the cockpit with a deck, often somewhat lower than the primary deck, to prevent a pooping wave from entering through the companionway. May also refer to the deck of a bridge.
• Flight deck: (Naval) A deck from which aircraft take off or land.
• Flush deck: Any continuous unbroken deck from stem to stern.
• Forecastle deck: The foremost part of the upper deck under which the sailors have their berths, extending from the foremast to the bow.
• Gun deck: (Naval) a deck below the spar deck where the ships' cannon were carried. The term originally referred to a deck aboard a ship that was primarily used for the mounting of cannon to be fired in broadsides. However, on many smaller vessels such as frigates and unrated vessels the upper deck, forecastle and quarterdeck bore all of the cannons but were not referred to as the gun deck. The completely covered level under the upper deck was, however, still called the gun deck although it had no guns at all.

<half-deck>...</half-deck>

• Half-deck: That portion of the deck next below the spar deck which is between the mainmast and the cabin.<Helo deck>...</Helo deck>
• Helicopter deck (heli deck): Usually located near the stern and always kept clear of obstacles hazardous to a helicopter landing.<Hurricane deck>...</Hurricane deck>
• Hurricane deck: (River Steamers, etc.), the upper deck, usually a light deck, erected above the frame of the hull (deriving its name from the wind that always seemed to blow on the deck).<Main deck>...</Main deck>
• Lido deck: Open area, typically at or near the stern of a passenger ship, housing the main outdoor swimming pool and sunbathing area.
• Lower deck: (a) the deck immediately over the hold, orig. only of a ship with two decks. (b) synonym for berth deck.
• Main deck: The principal deck of a vessel; in some ships the highest deck of the hull, usually but not always the weather deck; in sailing warships often a deck under the upper deck.
• Middle or Waist deck The upper deck amidships, the working area of the deck.
• Orlop deck: The deck or part of a deck where the cables are stowed, usually below the waterline. It is the lowest deck in a ship.
• Poop deck: The deck forming the roof of a poop or poop cabin, built on the upper deck and extending from the mizzenmast aft.
• Promenade deck: A "wrap-around porch" found on passenger ships and riverboats encircling the superstructure. This can have open railings or be enclosed in glass, or a combination. Often the entire level where this is located is referred to as the Promenade Deck. <Quarter-deck>...</Quarter-deck>
• Quarterdeck: (a) The part of the upper deck abaft the mainmast, including the poop deck when there is one. Usually reserved for ship's officers, guests, and passengers. (b) (Naval) The area to which a gangway for officers and diplomatic guests to board the vessel leads. Also any entry point for personnel.<Side-deck>...</Side-deck>
• Side-deck: The upper deck outboard of any structures such as a coachroof or doghouse, also called a breezeway<Spar deck>...</Spar deck>
• Spar deck: (a) Same as the upper deck. (b) Sometimes a light deck fitted over the upper deck.<Sweep deck>...</Sweep deck>
• Sweep deck: (Naval) The aftmost deck on a minesweeper, set close to the waterline for ease in launch and recovery of equipment.
• Topgallant forecastle deck: Any raised deck occurring above the forecastle deck (see above).
• Tween deck: the storage space between the hold and the main deck, often retractable.<Upper deck>...</Upper deck>
• Upper deck: The highest deck of the hull, extending from stem to stern.<Weather deck>...</Weather deck>
• Weather deck: (a) Any deck exposed to the outside. (b) The windward side decks.
• Well deck: (a) An exposed deck (weather deck) lower than decks fore and aft. In particular it is one enclosed by bulwarks limiting flow of water and thus drainage. (b) (Modern naval) A hangar-like deck located at the waterline in the stern of some amphibious assault ships, also known as a well dock. By taking on water the ship can lower the stern flooding the well deck and allowing boats and landing craft to dock within the ship.

Construction

Methods in wood

A traditional wood deck would consist of planks laid fore and aft over beams and along carlins, the seams of which are caulked and paid with tar. A yacht or other fancy boat might then have the deck canvased, with the fabric laid down in a thick layer of paint or sealant, and additional coats painted over. The wash or apron boards form the joint between the deck planking and that of the topsides, and are caulked similarly.

Modern "constructed decks" are used primarily on fiberglass, composite, and cold-molded hulls. The under structure of beams and carlins is the same as above. The decking itself is usually multiple layers of marine-grade plywood, covered over with layers of fibreglass in a plastic resin such as epoxy or polyester overlapped onto the topsides of the hull.

Methods in metal

Generally speaking, the method outlined for "constructed decks" is most similar to metal decks. The deck plating is laid over metal beams and carlins and tacked temporarily in place. The difficulty in metal construction is avoiding distortion of the plate while welding due to the high heat involved in the process. Welds are usually double pass, meaning each seam is welded twice, a time consuming process which may take longer than building the wood deck. But welds result in a waterproof deck which is strong and easily repairable. The deck structure is welded to the hull, making it structurally a single unit.

Because a metal deck, painted to reduce corrosion, can be quite slippery, pick up heat from the sun, and be quite loud to work on, a layer of wood decking or thick non-skid paint is often applied to its surface.

Methods in fiberglass

The process for building a deck in fiberglass is the same as for building a hull: a female mould is built, a layer of gel coat is sprayed in, then layers of fiberglass in resin are built up to the required deck thickness (if the deck has a core, the outer skin layers of fiberglass and resin are laid, then the core material, and finally the inner skin layers.) The deck is removed from the mould and usually mechanically fastened to the hull.

Fiberglass decks are quite slick with their mirror-smooth surfaces, so a non-skid texture is often moulded into their surface, or non-skid pads glued down in working areas.

Rules of thumb to determine the deck scantlings

The thickness of the decking affects how strong the hull is, and is directly related to how thick the skin of the hull itself is, which is of course related to how large the vessel is, the kind of work it is expected to do, and the kind of weather it may reasonably be expected to endure. While a Naval Engineer or Architect may have precise methods of determining what the scantlings should be, traditional builders used previous experiences and simpler rules-of-thumb to determine how thick the deck should be built.

The numbers derived by these formulae gives a rough number for determining the average thickness of materials based on some crude hull measurements. Below the waterline the thickness should be approximately 115% of the result, while upper topsides and decks might be reduced to 85% of the result.

• In wood – For plank thickness in inches, LOA (Length OverAll) and Beam are measured in feet. For plank thickness in mm, LOA and Beam are measured in meters.
  • Plank thickness in inches = ${{\sqrt {LOA}}+Beam \over 16}$
  • Plank thickness in mm = $[{\sqrt {LOA\cdot 3.28}}+(Beam\cdot 3.28)\cdot 1.58]$
• In fiberglass – For skin thickness in inches, LWL (Length WaterLine) is in feet. For skin thickness in mm, LWL is in meters.
  • Skin thickness (inches) = $0.07+{LWL \over 150}$
  • Skin thickness (mm) = $1.8+{LWL \over 1.8}$
• In fiberglass sandwich – First determine the skin thickness as single skin, then multiply by modifiers for inner skin, outer skin, and core thicknesses. Cored decks might be modified even thicker, 2.6–2.7, to increase stiffness.
  • Inner skin modifier = 0.3
  • Outer skin modifier = 0.4
  • Core modifier = 2.2

Glossary

• athwartships: perpendicular to fore and aft.
• beam: a timber similar in use to a floor joist, which runs from one side of the hull to the other athwartships.
• carlin: similar to a beam, except running in a fore and aft direction.
• caulk: to make water-tight by driving caulking (usually loose cotton fibers) into a seam, followed by a coarser fiber material such as oakum.
• core: in fibreglass construction, a layer between fiberglass skins, made of foam, end grain balsa, or other strengthening material to increase the stiffness of the deck.
• fore and aft: parallel to a line from the stem to the stern.
• gel coat: a heavily pigmented layer of plastic resin.
• oakum: loosely twisted hemp or jute or other crude fibre, sometimes treated with creosote or tar before use.
• pay: to pour into or fill up a seam so it is level with the top of the plank.
• plating: sheets of metal, generally simple flat pieces but may be formed into complex curvatures.
• pooping wave: A wave which comes over the stern and onto the deck.
• scantling: the critical dimensions of any element of the ship; so for the skin and deck of the hull it would be the thickness (of the planks, fibreglass layup, hull plating, etc.)
• seam: the space between two planks.
• stem: The timber at the front of the hull.
• stern: back end of the hull.
• topsides: the upper surfaces of the hull from the waterline to the deck.

Notes

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External links

• The history of the deck in old North European ships and languages
• Equipment on forecastle deck of ship by Picture

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