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Life Assessment of Gas Turbine Components Using Nondestructive Inspection Techniques PUBLIC ACCESS

[+] Author Affiliations
Kurt Walter

Sulzer Innotec, Winterthur, Switzerland

Wayne Greaves

Hickham Industries, La Porte, TX

Paper No. 97-GT-373, pp. V004T12A013; 4 pages
doi:10.1115/97-GT-373
From:
  • ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 4: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award
  • Orlando, Florida, USA, June 2–5, 1997
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7871-2
  • Copyright © 1997 by ASME

abstract

The life expectancy of gas turbine components is strongly dependant on the service conditions in which they operate. Diverse factors can reduce the life dramatically, or can extend it far beyond what was originally predicted by the Original Equipment Manufacturer. In order to examine the condition of the casing, compressor blading, stationary turbine vanes, and rotating turbine blades, nondestructive inspection has been performed more frequently as part of an overhaul. During inspections, visual examination is usually the only method used. Hot corrosion, oxidation or overaging of the blades may not be obvious during such an inspection. The most accurate method of evaluation involves the removal of the parts from the unit, complete visual and penetrant inspection, metallurgical evaluation, and destructive mechanical testing. Yet, complete disassembly only takes place if obvious problems are found. Microstructural analysis and physical testing in such situations add much to the condition assessment. Although many in-situ techniques have been in place for years, applying them to the evaluation of gas turbine components has been limited. When nondestructive inspection is done regularly, the art of evaluation and life assessment can become more scientific. The risk of failure can be reduced and the component life extended. This paper describes the procedure for preparation and examination.

Copyright © 1997 by ASME
This article is only available in the PDF format.

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