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Corrosion


  Corrosion means, a state of deterioration in metals caused by oxidation or chemical action. In other words metal is reacting with solved oxygen, this is called corrosion, and what is formed by the corrosion is rust. Most water pipes are metal pipes and corrosion occurs in all such pipes if appropriate measures are not taken. In the industry, above all in the case of process water, corresponding conditioning systems and materials are used to avoid corrosion. In most cases, however, corrosion is a very widespread problem. There are very many reasons for such corrosion but listing them all at this point would exceed the bounds of this document and so we shall list only the two most widespread types: corrosion owing to stagnant water and corrosion owing to unsaturated, aggressive water.
In both cases, the water or the oxygen dissolved in the water attacks the metals of which the pipes or machines are made. This results in rust or copper oxide etc. after a certain time. The incipient corrosion roughens the surfaces which speed up the entire process even more. Iron or copper can then be detected first in the water and, over the course of time, corrosion may clog up the pipes to such an extent that leakage ultimately occurs and the pipes need to be replaced.

Pursanova TM is capable of counteracting such simple forms of a corrosion process, stopping it and even reversing it. There are a lot of very special types of corrosion, especially not caused by water, but by ingredients of either a product, or hydrocarbon. Such cases have to be looked on individually. And there might be needed to setup a special project to make trails and special monitoring. However it is always worth to make a trial, Pursanova TM has for instance very good experience if it comes to corrosion caused by SRB, which would have looked from the theoretical point of view impossible, but worked in reality very well.

Experience shows corrosion rates measured in MPY are brought down in some cases more the factor of ten.

See as well the following case studies to this topic: corrosion in a steam boiler, condensate system, corrosion in a cooling loop.