On the one hand, in the conditions of the current production of many sub-sectors of chemistry and petrochemistry, it is not allowed to carry out firing work at all, on the other hand, due to high temperature, gas content, or for some other reasons, the repairmen do not have the opportunity to carry out their work, etc. D. You can read more about building technologies here: Repair and construction..Consequently, for such industries and production, a prerequisite for their successful work is a concentration for a relatively short time (usually from several days to two months) of a large number of construction and installation professions equipped with the corresponding number of necessary machines, mechanisms, equipment, equipment, etc. D. The objective need to attract fixed assets of the Interdwetzavian centralized repairs to such work on the overhaul of the fixed assets, since during the period of stop repairs of large -scale industries, the need for enterprises in qualified personnel usually several times higher than their repair personnel. Naturally, enterprises are not able to constantly contain such an amount of these employees that corresponds to the need for them during the peak period, as they cannot ensure their normal loading throughout the year. For the same reasons, they do not have the necessary material and technical base. On the other hand, a mismatch in the time of stopping repairs at various enterprises in the area of activity of the corresponding repair and construction organization determines (subject to intensive maneuvering by existing labor and material and technical resources) the efficient use of its capacities.