The complex cavitation is intended for the cleaning of underwater parts of hulls of vessels from biological growths through hydrodynamical jets without placing of a vessel to a dock. The complex cavitation is also capable of making underwater cleaning of floating means, structures of sea and river port and hydraulic engineering, including sea oil extracting platforms, bulk-oil moorings, piers, pipelines.

The complex CAVITATION TECHNOLOGY consists of surface and underwater parts, and also auxiliaries:

• Pump of high pressure (pressure P=160-200 kg/sq.sm2, productivity Q=160-200 l/min) with diesel or electric drive
• Booster pump with the electric drive (P-5 kg/sq.sm2, Q=200 l/min)

• Diving water-jet head with 350 mm width of a cleared surface
• Diving water-jet head with 800 mm width of a cleared surface
• Diving water-jet pistol
• Complete set of connecting sleeves of high pressure with 12-20 mm internal diameter designed for working pressure of 250 kg/sq.sm2

• Color underwater television system with an opportunity of sending of the information to surface and recording function consisting from underwater camera, monitor, recorder, fixtures and cable lines
• Diving Equipment
• Vessel - carrier with a diving complex

The basic working tool of cleaning are water-jet heads and water-jet pistol, which are equipped with generators of cavitation jets (nozzles).

The characteristics of productivity of a complex were determined during numerous laboratory and natural tests since 1993. Last natural test of a complex CAVITATION TECHNOLOGY were made from June 10 till July 30, 2000 on Russian Navy site in Feodosiya, by results of which the complex was recommended to commercial operation. From this moment the complex is successfully applying for cleaning and survey of vessels on a commercial basis.

The comparative characteristics for use of the underwater cleaning of the offering technology (CAVITATION) and traditional, where growth categories are accepted (seeTab. 2):

I - fine seaweed

II - long seaweed

III - long seaweed with fine up to 10 mm shells

IV - large barnacle, shells, friable rust and exfoliated paint ( general thickness 10-100 mm)

Given table shows the advantages of new technology on productivity on all growth categories is especialy on III and IV categories

Outboard water through the mesh filter and the water scoop hose submits by the booster pump to the pump of high pressure. From the pump of high pressure water on a pressure head hose submits to a pistol or head and, pass through the nozzle, turns in high-speed cavitation jet. At hit of a jet on a cleared surface at specific angle, it destroys growths not damaging protective paint covering.

Diving water-jet head moves on a cleared surface at the expense of hydrojet force, and the cavitation jet, leaving under the large pressure from the nozzles, placed on a rotating rotor, clears all area of scope of the head. The head is kept on a surface at the expense of hydrodynamical influxing force arising during rotor rotation.

Changing mode of operations of the nozzle (pressure, distance up to a surface, corner of an inclination of the nozzles, the time of influence of jets etc.) is possible to make qualitative cleaning of a surface not only from growths, but also from friable rust, old paint both without infringement of a basic paint covering, and up to white metal (before statement of a vessel in dock for the painting).

For the control and registration of quality of process of cleaning color television system is used.

Power generator of complex CAVITATION corresponds to the working requirements of the safety precautions for the ship equipment positioned on a deck.

The deck part of a complex is explosion-proof, since has no sparkle parts and surfaces which are heated up above of 800 C. The complex is absolutely safe and for treating vessel, since the contact occurs only with an underwater part, and a working body is the jet of water. Therefore complex CAVITATION can clean vessels with dangerous cargo, such as petroleum.

For maintenance of ecological safety the equipment is established on the pallet excluding hit of weeps of petroleum products from mechanisms on a deck of the vessel - carrier.

Water environment in the area of work of a complex is ecologically pure, since wastes of manufacture are outboard water and natural biological growths.

Thus, the proposing safe and ecologically pure technology differs by high quality and productivity of underwater cleaning. The cleaning of vessels is made on open roads in the places, in proper places and is coordinated with ecological services and port authorities of region.

By manufacture of works for minimization of influence on coastal waters ecosystems and damage to biological resources it is necessary to carry out all recommendations offered by an Estimation of influence on an environment to the given project.