Evaluation of the operating conditions of gas turbine blades and vanes after long term service

Pertti Auerkari, Jorma Salonen, Tom E. Gustafsson, Ilkka Karvonen, Heikki Tanttari, Sari Mäkinen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

    Abstract

    The combination of structural and materials performance together with the actual service conditions will determine the ideal timing for maintenance and the technical lifetime of gas turbine blades. While the designer aims to fit the process, structural and materials solutions together according to the foreseen service, some deviation is likely both in the manufactured components and in the actual service conditions. These deviations do not need to be large, as in particular a relatively small shift in local temperature can translate into large differences in life. The interest on the actual service temperatures often extends beyond the original supplier, but then the assumptions of design or original test data may not be available. Sacrificing one blade of a set for detailed inspection provides an opportunity to estimate the distributions of the effective service temperatures. In this paper, the principles of doing this are reviewed in brief, and few examples are given of evaluated blades. Although it is naturally possible that blades suffer from higher than expected thermal loads, quite often the evaluation will result in allowed life extension with or without refurbishment. The limitations of the approach are also discussed in brief.
    Original languageEnglish
    Title of host publicationBALTICA VII - Life Management and Maintenance for Power Plants. Vol. 2
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Pages25-34
    ISBN (Electronic)978-951-38-6318-0
    ISBN (Print)978-951-38-6317-3
    Publication statusPublished - 2007
    MoE publication typeB3 Non-refereed article in conference proceedings
    EventBALTICA VII - International Conference on Life Management and Main-tenance for Power Plants - Helsinki-Stockholm, Finland
    Duration: 12 Jun 200714 Jun 2007

    Conference

    ConferenceBALTICA VII - International Conference on Life Management and Main-tenance for Power Plants
    CountryFinland
    CityHelsinki-Stockholm
    Period12/06/0714/06/07

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