PSI - Issue 59

Ya. Grudz et al. / Procedia Structural Integrity 59 (2024) 745–749 Ya. Grudz et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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volume, in such terms, according to such technology, such composition and machinery, in which the total system costs would be minimal. Therefore, it is advisable to choose the optimal organizational and technological options for the operation of the maintenance and operation unit based on two criteria: maintenance and operation maintenance costs (taking into account the main production costs and associated costs); the duration of a complex of repair and restoration works, which require a decrease in the productivity of the gas pipeline or its complete shutdown. Moreover, the specified optimization criteria are very contradictory: on the one hand, the costs of repair and restoration work increase sharply with a reduction in the time allocated for their implementation, on the other hand, an unjustified extension of the repair time leads to large losses for the consumer due to a decrease in the throughput capacity of the gas pipeline (or of its complete stop). One of the most important stages of planning, organizing and managing the activities of the repair and operation unit during maintenance is the choice of technology for carrying out certain preventive and restorative works, taking into account specific operating conditions and other related factors. Analysis of the practice of operation and restoration of gas transportation systems proves the existence of various alternative options for the technology of carrying out work at various facilities. Within the framework of the developed modular technological model of maintenance and repair of the linear part of the main gas pipeline and its elements, the most widespread technological sets of restorative and preventive works of different levels of priority have been formed. The task of choosing a rational technology is reduced to several successive stages (Grudz. et. al., 2020; Okipnyi et. al., 2020): - assessment of the situation and the formation of possible options for the technology of performing works with the involvement of specified capacities; - analysis of technological limitations and other factors acting as such; - preparation of initial data for calculations on the remaining alternative options; - calculation and comparison of efficiency indicators of the considered technological alternatives. In general, the task looks like this:   ; min ; KN KN jv jv KN KN jv jv R m C R m  , (1)

KN jv R is type of technology;

where

KN jv m is technological module. With restrictions on the time of performance of work:   ; min ; KN KN jv jv KN KN jv jv R m C R m  With restrictions on the capacity of the involved units:   ; min ; KN KN jv jv KN KN jv jv R m KN К jv a C R m m М       . p        .

(2)

(3)

With restrictions on any types of material and technical resources: