Abstract
Objective: To provide scientific justification for the choice of measures on prevention of pyrophoric deposits. Methods: Literature data analysis as well as systems analysis method was applied. Results: Pyrophoric deposits as potential sources of ignition in steel tanks are considered in the study. After the analysis of possible factors of pyrophoric deposits spontaneous ignition in steel tanks, a directed graph is constructed to represent their interrelation. Given that the growth rate of pyrophoric deposits is directly proportional to the corrosion rate of the tank material, their dependence is obtained. The rate of pyrophoric deposits formation is analyzed by means of a specific example. It is shown that the use of gas-thermal coating with aluminum or epoxy paints inside the tank reduces the rate of pyrophoric deposits formation. Based on the principle of excluding one of the factors from the «pyrophoric triangle» (Fe-S-O2), a table on the choice of measures for prevention of pyrophoric deposits ignition was developed depending on the tank life cycle. Each of the proposed activities is applicable only to a specific tank life cycle. The exclusion of Fe is possible with the use of polymer tanks and anticorrosion coating during the construction. It is possible to eliminate S only at preliminary cleaning of oil products from it. The most common and effective way is to eliminate O2, which can be achieved at all stages of the tank life cycle. Practical importance: The choice of measures in accordance with the developed table will make it possible to prevent the formation and, as a consequence, the occurrence of accidents caused by the ignition of pyrophoric deposits in steel tanks.
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