Fouling


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fouling

[′fau̇l·iŋ]
(chemical engineering)
Deposition on the surface of a heat-transfer device of sediment in the form of scale derived from burned particles of the heated substance.
(naval architecture)
The adhesion of different marine organisms to the underwater parts of ships, causing the ships to lose speed.
(ordnance)
The deposit that remains on the bore of a gun after firing.

Fouling

 

the settling of aquatic organisms in water-intake pipes and on rocks and stones, buoys, underwater cables, port and other hydrotechnical structures, and the bottom of ships.

The principal fouling organisms are sessile animals and plants—for example, cirripeds (acorn barnacles and goose barnacles), bivalve mollusks (mussels), hydroids, mosses, sponges, ascidians, Sedentaria, and algae. Motile animals, primarily worms and crustaceans, settle among the sessile organisms. One of the most important components of fouling are bacteria, which generally settle first on unfouled surfaces.

The majority of fouling organisms, as a result of reproduction, produce spores or planktonic larvae, which are distributed by currents and subsequently settle on a substrate, where they transfer to a sessile way of life. Marine fouling is more varied and extensive (up to 100 or more kg per sq m) than freshwater fouling. Fouling animals generally feed on tiny food particles, which they filter out of or capture in the water.

There are many known cases of fouling organisms being extensively distributed by means of ships. For example, after the completion of the Volga-Don Canal, more than 20 species of invertebrates and algae were transferred on the bottom of ships from the Sea of Azov to the Caspian Sea, where the organisms settled.

Fouling decreases the speed of ships and impedes the flow of water in pipes leading to industrial enterprises. It also cuts down on the efficiency of cooling installations. Fouling adds to the exposure of piers and docks to the action of waves, and it promotes the corrosion of metal and concrete underwater structures.

Control measures include cleaning fouled surfaces regularly, rinsing water pipes with hot water or chemical solutions that are toxic to fouling organisms, and covering overgrown surfaces with poisonous paints.

REFERENCES

Morskoe obrastanie i bor’ba s nim. Moscow, 1957. (Translated from English.)
Morskie obrastaniia i drevolochtsy. Moscow, 1961. (Trudy Instituta okeanologii AN SSSR, vol. 49.)
Morskie obrastaniia i drevotochtsy. Moscow, 1963. (Trudy Instituta okeanologii AN SSSR, vol. 70.)
Morskoe obrastaniia. Moscow, 1967. (Trudy Instituta okeanologii AN SSSR, vol. 85.)
Zevina, G. B. Obrastaniia v moriakh SSSR. Moscow, 1972.

G. M. BELIAEV

References in periodicals archive ?
In order to determine the organic compositions of the fouling material, the following procedures were carried out.
Tests were performed at four different conditions: 1) at clean condition (base case), 2) at fouled condition after injection of 100 g of the fouling material, 3) at fouled condition after injection of 200 g of the fouling material, and 4) at fouled condition after injection of 300 g of the fouling material.
Ben van Baarle, "Mold fouling during rubber vulcanization," Rubber World, vol.
Young, "Removing fouling residue from molds in-the-press with solid C[O.
The principal method used in our Department for monitoring thermal fouling involves the application of a known constant and uniform heat flux (e.
Characteristic fouling curves are shown in Figure 1.
They can also be over-applied, resulting in a detrimental effect of mold fouling.
Mold surface treatment helps with abrasive wear from the processing of the materials, provides corrosion resistance from chemical attacks by the various chemical ingredients and by-products from the curing process and provides a smooth, pore-free surface for part quality and reduced mold fouling.
In the possibilities mentioned above, mold fouling is caused by components in the compound or reaction products.