An increase in demand for electric power necessitates the revamping and construction of systems characterised by increasingly high efficiency. The construction of power units exposed to supercritical and ultra-supercritical parameters requires the use of new technologies and materials. The study presents two examples concerned with the cracking of boiler systems related to the use of a new hybrid welding technology and the use of a new material, i.e. Alloy 59. It was ascertained that the use of state-of-the-art technologies and materials is justified, yet requires the analysis and verification of designs assumptions and operating conditions.

doi: 10.17729/ebis.2018.5/22