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  2. In-water surface cleaning - Wikipedia

    en.wikipedia.org/wiki/In-water_surface_cleaning

    In-water cleaning, also known as in-water surface cleaning, is a collection of methods for removing unwanted material in-situ from the underwater surface of a structure.. This often refers to removing marine fouling growth from ship hulls, but also has applications on civil engineering structures, pipeline intakes and similar components which are impossible or inconvenient to remove from the ...

  3. Anti-fouling paint - Wikipedia

    en.wikipedia.org/wiki/Anti-fouling_paint

    New ship being prepared for launch, showing fresh anti-fouling paint Ship hull being cleaned of fouling in drydock. Anti-fouling paint is a specialized category of coatings applied as the outer (outboard) layer to the hull of a ship or boat, to slow the growth of and facilitate detachment of subaquatic organisms that attach to the hull and can affect a vessel's performance and durability.

  4. Galvanic anode - Wikipedia

    en.wikipedia.org/wiki/Galvanic_anode

    A galvanic anode, or sacrificial anode, is the main component of a galvanic cathodic protection system used to protect buried or submerged metal structures from corrosion. They are made from a metal alloy with a more "active" voltage (more negative reduction potential / more positive oxidation potential) than the metal of the structure. The ...

  5. Cathodic protection - Wikipedia

    en.wikipedia.org/wiki/Cathodic_protection

    The white patches visible on the ship's hull are zinc block sacrificial anodes. Cathodic protection on ships is often implemented by galvanic anodes attached to the hull and ICCP for larger vessels. Since ships are regularly removed from the water for inspections and maintenance, it is a simple task to replace the galvanic anodes.

  6. Hull maintenance technician - Wikipedia

    en.wikipedia.org/wiki/Hull_Maintenance_Technician

    A hull maintenance technician using a cutting torch aboard the USS Nimitz. Hull maintenance technician (abbreviated as HT) is a United States Navy occupational rating.. Hull maintenance technicians plan, supervise, and perform tasks necessary for fabrication, installation and repair of all types of shipboard structures, plumbing, sheet metal fabrication, carpentry and piping systems; organize ...

  7. Microbial corrosion - Wikipedia

    en.wikipedia.org/wiki/Microbial_corrosion

    They live in the water-fuel interface of the water droplets, form dark black/brown/green, gel-like mats, and cause microbial corrosion to plastic and rubber parts of the aircraft fuel system by consuming them, and to the metal parts by the means of their acidic metabolic products. They are also incorrectly called algae due to their appearance.

  8. Careening - Wikipedia

    en.wikipedia.org/wiki/Careening

    An Old Whaler Hove Down For Repairs, Near New Bedford, a wood engraving drawn by F. S. Cozzens and published in Harper's Weekly, December 1882. Careening (also known as "heaving down") is a method of gaining access to the hull of a sailing vessel without the use of a dry dock.

  9. Floor drain - Wikipedia

    en.wikipedia.org/wiki/Floor_drain

    Floor drain system in bathroom, Korea. A floor drain is a plumbing fixture that is installed in the floor of a structure, mainly designed to remove any standing water near it. They are usually round, but can also be square or rectangular. They usually range from 2 to 12 inches (5.1 to 30.5 cm); most are 4 inches (10 cm) in diameter.

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