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  2. Butterworth cover - Wikipedia

    en.wikipedia.org/wiki/Butterworth_Cover

    Butterworth cover. A Butterworth cover (also Butterworth hatch and Butterworth plate) is a hatch on the deck of a cargo vessel that is used to seal a small opening that admits to the space below. [1][2] In oil tankers and other marine vessels used for transporting fluid products, there are small service openings though the deck into each tank ...

  3. Metal roof - Wikipedia

    en.wikipedia.org/wiki/Metal_roof

    Metal roof. A metal roof is a roofing system featuring metal pieces or tiles exhibiting corrosion resistance, impermeability to water, and long life. It is a component of the building envelope. The metal pieces may be a covering on a structural, non-waterproof roof, or they could be self-supporting sheets.

  4. Boat building - Wikipedia

    en.wikipedia.org/wiki/Boat_building

    Aluminum and aluminum alloys are used both in sheet form for all-metal hulls or for isolated structural members. Many sailing spars are frequently made of aluminium after 1960. It is the lightest material for building large boats (being 15–20% lighter than polyester and 30% lighter than steel).

  5. Hold (compartment) - Wikipedia

    en.wikipedia.org/wiki/Hold_(compartment)

    A cargo hatch or deck hatch or hatchway is type of door used on ships and boats to cover the opening to the cargo hold or other lower part of the ship. To make the cargo hold waterproof, most cargo holds have cargo hatch. This can be a waterproof door, like a trap door with hinges or a cover that is places on top of the cargo hold opening ...

  6. Deck (ship) - Wikipedia

    en.wikipedia.org/wiki/Deck_(ship)

    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 [1] of a ship. On a boat or ship, the primary or upper deck is the horizontal structure that forms the "roof" of the hull, strengthening it and serving as the primary working surface.

  7. Hull (watercraft) - Wikipedia

    en.wikipedia.org/wiki/Hull_(watercraft)

    Hull (watercraft) A hull is the watertight body of a ship, boat, submarine, or flying boat. The hull may open at the top (such as a dinghy), or it may be fully or partially covered with a deck. Atop the deck may be a deckhouse and other superstructures, such as a funnel, derrick, or mast. The line where the hull meets the water surface is ...

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