Failure analysis of interfering part of a steam turbine journal bearing

An article published in « Case Studies in Engineering Failure Analysis« , octobre 2014.

Journal bearings as so sensitive parts of steam turbines are very susceptible to failure through different mechanisms of wear, fatigue and crush during service conditions. Failure occurring through these mechanisms lead to turbine completely shut down as a result of interfering in working conditions of bearing different parts. In this paper, failed interfered part of a journal bearing related to a 320,000 kW steam turbine was examined. The studies were revealed that the bearing part loosing and inappropriate clearance can produce relative displacements under cyclic gradient loading. This condition was detrimental for the service life of turbine journal bearing via failure through fretting fatigue mechanism.

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Issues to improve the safety of 18K370 steam turbine operation

2017-02-23_09h04_00An article published by « E3S Web of Conferences 13, 04003 (2017)« .

The paper presents the process of improving the safety and reliability of operation the 18K370 steam turbines Opole Power Plant since the first failure in 2010, up to install the on-line monitoring system. It shows how the units work and how to analyse the contol stage as a critical node in designing the turbine. They have also briefly discussed the way of lifecycle management of individual elements. The presented actions could be considered satisfactory, and improve the safety of operating steam turbines of type 18K370.

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Crack of a first stage blade in a steam turbine

A new Case Study in « Case Studies in Engineering Failure Analysis », Volume 2, Issue 2, October 2014, Pages 54–60

The failure of the first stage blade in a steam turbine of 55 MW was investigated. The blade was made of 17-4 PH stainless steel and has been used for 12 years before failure. The current work aims to find out the main cause of the first stage blade failure. The result showed that the crack at the blade root tang was due to corrosion fatigue and the crack occurred at the blade root fillet owing to stress corrosion cracking.

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