Introduction of hull cleaning technology under water cavitation jet

　　For ships, marine fouling organisms will be adsorbed on the hull, which not only damages aesthetics, but also slows down the speed of ships, which increases fuel costs and maintenance costs. In addition, it will cause environmental problems of increased carbon dioxide emissions and ecological problems of alien species invasion. According to research, pollution of hull will increase the hydrodynamic volume and friction of ship, resulting in a 60% increase in resistance. A 10% reduction in speed due to increased drag requires a 40% increase in fuel to compensate.

　　The three key marine organisms responsible for hull fouling are biological slime or silt, algae seagrass, and crustaceans. Let's take a look at the characteristics of these fouling.

　　Bioslime is the slime secreted by fouling microorganisms in the ocean, which can form colonies and cause fouling of some facilities. The clay minerals of coastal silt are mainly illite and montmorillonite, while freshwater silt is mainly composed of illite and kaolinite.

　　Features: The adhesion strength is relatively weak, which mainly affects the surface of hull and can cause a speed loss of 5%.

　　Seaweeds and seaweeds are usually fixed on the seabed or some kind of solid structure. Diatoms, Enteromorpha, Ulva, and water clouds are the main algae fouling substances.

　　Features: Moderate adhesion strength, thickness up to 1000 microns, speed loss about 15%.

　　Among the crustacean fouling organisms, the most harmful crustaceans include barnacles, oysters, and mussels.

　　Features: strong adhesion, thickness up to 10000 microns, great influence on ship speed, speed loss up to 30%.

　　Therefore, it is very necessary to remove marine organisms from ships on a regular basis. At present, the more common hull cleaning methods mainly include sand blasting and high-pressure water jet cleaning. Both of these construction methods must make ship enter dock before proceeding. cavitation jet underwater hull cleaning equipment adopts cavitation jet cleaning technology to remove marine organisms directly underwater. Ship cleaning no longer needs to be docked, which can save money and time for ship owners.

　　SINPO cavitation jet underwater hull cleaning equipment does not require ships to dock and can be cleaned directly at sea or at berths, which can save 60% of cost and greatly reduce the loss of ships' suspension. The fouling of various non-planar objects such as marine propellers, rudders, seabed doors, stabilizers, stiffeners, pipeline interiors, and underwater parts of platforms can also be easily removed.