14-10-2014, 10:51 AM
Abstracts: Corrosion problems are the result of the action of oxygen and the effect of low or high pH on metal components, including the boiler tubes and drum, which are constructed of carbon steel. Corrosion can also occur from excessive alkalinity of excessive pH of the boiler water. This caustic attack is most likely to occur under scale or deposits, where very high local concentrations of hydroxide can build or in zones where insufficient cooling flows fails to sufficiently remove the heat input, leading to boiling, and thus steam blanketing occurs.” Corrosion can occur in the boiler, as well as in the pre-boiler and after-boiler sections, which can also be constructed of carbon steel. Corrosion can result in loss of metal volume or in a reduction of the integrity of the metal, situations that can lead to structural failure, particularly when metal loss is localized.