Limescale/Corrosion in heating systems

In raw waters, which are not separately treated, the formation of calciferous deposits take place depending on the content of calcium salts (the degree of hardness) and the temperature. These calciferous deposits, also known as boiler scale, usually occur above temperatures of 70°C and are related to escaping carbon dioxide and consequently exceeding the solubility level of the lime solution. Calciferous deposits are generally undesirable and can have the following effects:

  • form scales on the metal surface, that insulate and severely hinder the heat transfer
  • depending on the lime covering, surfaces with varying temperatures develop, which can lead to sudden water evaporation on the overheated metal (boiler scale explosion).
  • contamination of a system with loose lime flakes
  • concentration of chlorides in the porous lime layer with the consequent danger of severe crevice corrosion in stainless steel materials.

Calcification can be efficiently removed with organic acids. However, when dealing with un-alloyed steels, it is necessary to prevent the steel from attack by using a suitable inhibitor. Once the limescale is removed the function of the component or system is re-established. Applying a final conservation to such components creates a good basis for further operational efficiency.

Degreasing, derusting, descaling
Deposits of grease, silicon oils, limescale or corrosion products on surfaces which come into contact with the product are generally undesirable and may massively impair the function of the surfaces. In particular for heat exchangers, e.g. plate type heat exchangers or tube bundle heat exchangers and other heat transmitters, limescale deposits always cause a massive reduction of efficiency. Removal of undesirable coatings and deposits calls for particular specialized knowledge and experience if the underlying material is not to be damaged in the course of treatment. We conserve the cleaned surfaces in such a way that the service life of a facility can even be extended. Heat transitions are greatly improved and fouling can no longer occur so quickly. Our solutions adapted specifically to the facility guarantee optimum results. The results of our treatments are assured and proven by appropriate tests and verifications. All this adds measurable value to the facility.