pipelines

This study presents a methodology for assessing the technical condition of district heating pipelines under high wear, variable thermal loads, and limited modernization resources. Emphasis is placed on installation defects, cyclic temperature and pressure fluctuations, and corrosion-induced degradation. A case study of a return water pipeline in Kremenchuk, featuring a 3° installation misalignment and 10 cm flange displacement, demonstrated stresses of 220–250 MPa, exceeding the steel’s yield strength in critical zones.

         The energy security state of the Visegrad Group member states in the context of the implementation of the “Nord Stream-2” gas pipeline has been analyzed. The Visegrad Four countries positions regarding the realization of the gas project initiated by the Russian Federation have been considered. It has been clarified that the “Nord Stream-2” pipeline construction is a threat to energy security not only for the Visegrad States but also for the European Union.