Calculation methodology and results of pipeline stress analysis, supports and steam pipeline hanging reconstruction for RA fresh steam pipeline at Power plant Kostolac B with increased fresh steam flow rate of 1060 t/h and new operational conditions

Abstract

In order to reach designed power output of 2 x 348.5MW at two units of the Thermal power plant Kostolac B, a number of modernization and reconstruction activities are performed as well as static and dynamic fresh steam pipeline stress analysis. All overhauls and retrofits are conducted with aim to increase plant efficiency and reduce environmental pollution. In order to reach the design power, it was determined that it is necessary to increase the fresh steam flow rate from 1000 t/h to 1060 t/h. In this paper, the calculation methodology and obtained results of pipeline stress analysis of the fresh steam pipeline with new operational conditions are presented. Maximal fresh steam pipeline loads are determined in cases of transient conditions. The results of the pipeline stress analyses are presented together with the determined support loads and hangings. The steam pipeline operational parameter are analysed during trips and shut-offs, cold and hot start-ups and drainage conditions. Obtained results are support for the safety analyses and operational conditions determination.