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Failure to Achieve Hot Section Component Service Intervals: Why and What to Do About it FREE

[+] Author Affiliations
Steven A. Lefton, Thomas D. Burnett, Todd A. Kuntz, Steve R. Paterson

Aptech Engineering Services, Inc., Sunnyvale, CA

Paper No. 97-GT-138, pp. V004T12A003; 16 pages
doi:10.1115/97-GT-138
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

Recent work done by Aptech Engineering Services, Inc. (APTECH) has demonstrated that many hot section gas turbine components are not achieving their intended service lives and/or maintenance intervals, falling short by a factor of as much as ten. As summarized in (Makansi, 1996), this observation has been confirmed by numerous industry and literature reports of failures, degradation, reduced availability and increased maintenance for a wide variety of turbines and manufacturers.

This paper focuses on hot corrosion damage as one common mechanism that is frequently the cause of failure to reach expected service intervals. In general, attempts are made to limit hot corrosion damage by specifying impurity limits for fuel oil, combustion air, NOx reduction injection water and compressor washing water. Strict adherence to manufacturers recommended impurity limits is often very difficult to achieve, particularly if the machine is frequently cycled through harsh (but not uncommon) operating transients. A discussion of various manufacturer specifications and their implications will be presented, followed by two case studies which demonstrate that extensive hot corrosion damage can result even when manufacturers specifications for fuel, air and water purity are (apparently) being met. A proposed modification of traditional impurity limit specifications is offered, which would include guidelines for acceptable corrosion rate limits. Practical recommendations for reducing the potential for hot corrosion are also offered.

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

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