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Marine structures fouling remove

marine structures cleaning from biofouling

Сleaning of any marine structures from biofouling

You can send us the size of your structure, its location, as well as specify the level of fouling. Based on these data, we will prepare the cost of cleaning. If you have any difficulties with determining the size needed to calculate the cost – you can order a free visit of our employee to conduct measurements on the spot.

We clean effectively:

  • marine gas stations
  • any types of pontoons
  • piers
  • cargo berths
  • ferry piers
  • wooden quays
  • landing stages
  • floating berths
  • oil piers
  • wharves
  • bridges
  • heat exchangers
  • pylons
  • pillars
  • piles
  • abutments
  • culverts
  • pipes
  • any underwater mechanisms
  • penstock
  • floodgate
  • and any other underwater structures

The cleaning and inspection of the underwater elements to marine gas stations, bridges, and wharves such as pylons, pillars, piles, piers, abutments, and culverts is a vital part of the asset maintenance required by government agencies and private companies.

The AQUACLEAN.TECH company provides services in a cleaning of underwater surfaces from the most different types of fouling and biofouling. Commercial underwater cleaning from biofouling is carried out with our specialized equipment specifically designed for these types of structures. Our certified commercial divers have extensive experience performing bridge and wharf inspections including obtaining underwater photographic and video evidence as required. If desired live monitoring of the inspection from the surface and audio communications with the diver can be provided enabling specific requests or instructions to be supplied while watching the inspection in progress.

Order cleaning is easy. Use our calculator at the top of the page, correctly enter the data and get the final cost. Our team is ready to leave at the appointed time after payment is confirmed. The work will be done in the shortest possible time, and you will receive a detailed report on the cleaning of biofouling

Biofouling accelerates corrosion and destruction of structures and equipment

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Watch how high pressure water blasting cleaning marine growth from structures

DESTRUCTIVE EFFECTS OF BIOFOULING

In addition to interfering with the function of the structures on which it grows, fouling may accelerate the corrosion of their metallic surfaces or injure the paint coatings intended to protect them from rusting. It has been argued that a heavy mat of fouling may actually protect the surface from corrosion by preventing the renewed access of seawater or of the oxygen which is required for rusting. This view is supported by the clean appearance of the steel and the absence of red rust when the fouling is scraped away. The shell fauna did not appear to affect corrosion of metals appreciably while living, but that dead organisms stimulated local corrosion, leaving more or less circular patches of damage. Some organisms become covered up and smothered by their neighbors, localized corrosion is caused. Passive and marginally passive alloys, such as stainless steel and nickel alloys, in which the surrounding surfaces of the metal remain relatively smooth, show particularly clearly the localized corrosion which occurs under fouling organisms.

A variety of mechanisms have been suggested to explain how fouling may influence corrosion. One view is that any uneven adherence of the base of a fouling organism may result in inequalities in the concentration of oxygen at the metallic surface, and may create oxygen-concentration cells which accelerate corrosion by galvanic mechanisms. Another suggestion frequently made is those metabolic products of the fouling, and particularly the production of acid conditions and hydrogen sulfide by dying members of the community, create a condition favorable to corrosion. The presence of fouling, both alive or dead, may be expected to favor the accumulation and growth of microorganisms, particularly sulfate-reducing bacteria, to which has attributed the corrosion of iron under marine conditions. Sulfatereducing bacteria are known to be active in the destruction of underground pipes. They secure their needed oxygen under anaerobic conditions by reducing sulfates. In this process, hydrogen is consumed, and the resulting depolarization of the metallic surface favors its corrosion. Sulfate-reducing bacteria are found abundantly in sea water and in the mud of harbors and on fouled or rusting surfaces which are exposed in such places. The layer of red ferric hydrate which forms on iron rusting in sea water is frequently underlaid by black deposits containing sulfides, which indicates that the primary corrosion products are being formed under anaerobic conditions.

SALTWATER PIPE SYSTEMS
Power stations, oil refineries, and other users of sea water for industrial purposes may be greatly inconvenienced by the growth of fouling organisms in their water circuits. The growth reduces the carrying capacity of the conduits by increasing the frictional resistance as well as by reducing the pipeline diameter. The growths continue to accumulate until they are so great that they may be torn loose and swept into screens, tube sheets, or pumps. The resultant stoppage may allow pressures to accumulate in the systems to the breaking point. In addition to the inefficiencies of operation and the hazards caused by fouling growths, expense arises from the necessity of closing down parts of the system for cleaning. As much as 266 tons of 13 shells have been removed in one year from the tunnel of one New England power station. At another tunnel, dead shells have accumulated to a depth of 3 to 6 feet. Many stations have had to shut down entire turbo-generator units two or three times a day to permit removal of shells blanketing the tube sheets. Shells which enter the tubes cause high impingement velocities which increase erosion and reduce tube life. Fouling developed in less than four months in an intake tunnel of the Lynn Gas and Electric Company. The mussels growing on the wall of this tunnel weighed more than 10 pounds per square foot and made a mat 2 inches thick In addition to the mechanical effects produced by the growth of macroscopic fouling organisms, the accumulation of deposits due to capsulated and slime-forming bacteria reduces the heat transfer efficiency of condensers. Pipes and conduits used to distribute salt water in vessels, industrial plants, and aquaria provide favorable places for fouling organisms to grow.

Flow is interfered with due to the decreased size of the channel and the increased roughness of the surface. There is always danger that the systems will be blocked at valves, orifices, and other constricted places by organisms which become detached.

The problem is particularly acute in the case of ships and shore structures, because the piping is designed for high velocities flow and is relatively small, so that fouling may greatly reduce the capacity. It is essential that the pipes be kept free from fouling at all times because of the hazard from fire if the fire mains become clogged. Because of the complexity of the systems, the expense of breaking them down for cleaning is great. It has been found that fouling occurs most readily in fire mains and in branches leading to fire plugs on deck, radiators, and other auxiliary machinery. A section of the four-inch fire main almost completely clogged with tube worms following a period of duty of the ship in the Adriatic region. The fouling is more pronounced in the sections of five inches or more in diameter, and in the vicinity of boiler and engine rooms where the temperature is usually higher. A pipe having constant water flow will usually be free of growth, while one with very little flow, or where the water comes to rest for short periods, will be badly fouled. The fouling of ships’ piping depends upon the local conditions of operation. At any part of the iron structure of the ship will tend to inactivate certain parts of the internal surface of the pipe, even though it be constructed of copper. The prevention of fouling in salt water pipes by the use of suitable metals is difficult since those metals which resist erosion adequately do not have antifouling surfaces.

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