Abstract
The comparative results of fatigue life assessment analyses are presented for piping branch connection of Tee type (Tee) of power station main steam piping. The results are derived using the German Standard TRD approach with and without usage of modified finite element analyses of transient thermal stresses, occurring during power station startup or shutdown. The traditional TRD approach for Tee stress analyses is conservative due to the use of formulas which are the upper estimate of transient thermal stresses. The TRD assumption about the coincidence of creep and fatigue maximum stress areas is very conservative as well. The analyses results enable us to extend the power station piping components life assessment.
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