Review on Common Failure of Steam Turbine blade

Abstract

This paper is meant to help with failure investigation, presenting a review of the causes and effects involved when blades fail. Included are descriptions of failure mechanisms (stress; resonance; environment) and of the conditions causing the failures (design; manufacturing; operation). the first with a crack initiating at the strain raiser point and propagating at low rate, a second where and the third one consisting of unstable fracture. Stress intensity factor approach is used to identify the three crack zones and establish the mechanism of the machine failure. Blade failure is a common problem of a steam turbine and it’s failure in-service results in safety risky, repair cost and operational revenue losses.
Keyword:- steam turbine; blade failure; stress; dynamic analysis; mechanism