Analysis of the cracking processes of jointing components used in turbine valve chest

摘要

Root causes of premature breakage of the bolts fastening the connection members of shut-off valves in valve chests for secondary superheated steam. The experiments showed that the cracking of bolts had been caused by the process of accelerated creeping under high tensile stresses. The obtained results may constitute the basis for formulation of operating guidelines and recommendations, resulting in extended life of the components under consideration.