Underwater Hull Cleaning

Commercial Diving Service

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Clean ship’s Hull means, reduction of fuel consumption, reduction of CO2 emissions, increase of ships speed.

One of the biggest problems facing the world shipping is fouled ships hulls. 1746 different species of marine organisms have been counted up, which are attached to submerged surfaces. Like shellfish, seaweed, sea moss and hydroids, which clog the underwater intakes, covering antifouling paint and creating a thick layer on the ship’s hull which in time destroys and affects its “good” function. Shellfish such as oysters and mussels, release millions of young bivalves in the water, which move with the help of the ocean currents. The young bivalves to enable to feed themselves adhere to static objects, which attract various species of algae. Ships that are anchored are ideal for the growth of these microorganisms. Typically these are reduced when the ship is at sail, except for some that are very durable, such as the Brown Weed, which remain on the hull even when the ship is developing rapidly.

Another very resistant species are algae that secrete a sticky fluid which is highly corrosive, deriving from billions of algae monocytes, which produce syrupy nutritional means, which creates colonies, once installed they reproduce. Thus a coating of the sticky liquid is created, as a thick layer which remains on the hull as the ship moves.

The outcome of fouled hulls is the increase of abrasion resistance of the ship. The increased abrasion leads to speed reduction. Coating with 1mm thickness increases the abrasion by 80% thereby reducing the speed by 15% (Townsin 1987; Lui et al, 1977). So in order to maintain the same speed greater fuel consumption is required, thereby increasing the cost and the emission of gaseous pollutants. Depending on the type of vessel, fuel can make up about 50% of the operating cost of a ship. It is estimated that the fuel consumption increases 6% for each 100mm increase of speed. The increase in weight of the hull from the fouling has the effect of reducing the hydrodynamic behavior of the vessel, since it lowers the center of gravity of the vessel, therefore affecting its maneuverability.

The fouled hulls and propellers strain the engines and can lead to engine problems, since the hydrostatic shape of the hull and propeller changes, the vibration is increased. The underwater hull cleaning (uw hull cleaning) ensures increased speed, reduction of fuel consumption and reduction of gaseous pollutants.

underwater cleaning

  • Underwater cleaning of sides
  • Underwater cleaning of flat
  • Underwater cleaning of curves
  • Underwater cleaning of the rudder
  • Underwater cleaning of the propeller
  • Underwater cleaning of the sea-gratings
  • Underwater cleaning of the sea chests

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