Astrakhan-Mangyshlak water main: Corrosion state of the inner surface, and methods for its corrosion protection. Part III. The effects of KW2353 inhibitor. Part IV. Microbiological corrosion

It is inadmissible to employ the inhibitors of polyphosphate type, including KW/2353, for the corrosion protection of the inner surface of long-distance water mains. When becoming deficient due to its exhaustion, the inhibitor aggravates the localized corrosion. On the other hand, in sufficient concentration, it facilitates microbial corrosion, serving as a nutrient for microorganisms. The optimum method for the corrosion protection of the steel equipment contacting water media consists in their deoxygenation. Complex investigations, including corrosion-elecrochemical, physical and analytical tests, are necessary to predict both the rate and character of the corrosion of engineering equipment in contact with such media; the weighing procedures may be disinformative.