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Deck maintenance

The main material used in a ship is steel. Unfortunately, steel rusts when in contact with air, water or salt solutions. To prevent the corrosion of steel, the metal is coated with cement wash, bitumen and paint. Cement wash is a mixture of cement powder and fresh water. It is used in freshwater tanks and double bottom tanks. Bitumen is used in bilges and peak tanks. It is also used on metal decks before they are covered with wood.

The main protective coating is paint There are many types, of paint in a wide variety of colors...Paints, are stowed in the paint locker, which is usually situated under the forecastle..

The most common kinds of paint on-board-ship are: metal . primers, undercoats, top coats, heat-resistant paints, non-slip paints and varnishes.

Metal primers are applied to a bare surface to give protection against rust and to act as a key to the next coat.

'Undercoats are used over the primer before the top coat.

Top coats give a hard-wearing surface and the required color.

Heat-resistant paints are used for radiators and pipes and for the ship's funnel.

Non-slip paints arc used on weather decks and other suitable surfaces such as companion-ways.

Varnishes give a clear protective coat to woodwork.

For painting, the surface of a ship's hull is divided into three areas: the topside, boot-topping and bottom. Topside paint is applied to the area of the ship's hull which is out of the water when the ship is loaded. Boot-topping is applied to that area of the hull which is out of. the water when the ship is in the light condition and under water when the ship is loaded. A ship's bottom is given a coating of anti- fouling paint. Anti-fouling paints contain toxicants which are poisonous to. marine life. The toxicants have to dissolve out of the paint into the water in order to be effective.

Before an area is painted, proper preparation is^ important. The area must be cleaned and washed with a cleaning solution to remove all" salt,, dirt and oil. The paintwork must be rinsed with clean fresh water and all the cleaning solution removed. Loose paint and scale is removed with a scraper and heavy rust with a chipping hammer. Finally, a wire brush must be used on all bare metal to remove the last" of the scale, before the first coat of paint is applied.

 

1 What is the main material used in a ship?

2 Where are paints stowed?

3 What is the main protective coating?

 

 


Date: 2015-01-11; view: 1115


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