Detection of magnetite piles on steam generator tubing with eddy current method

Tarja Jäppinen, Kari Lahdenperä

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    The magnetite deposits and deposit piles on the secondary circuit of the steam generator tubing are detected with eddy current method in in-service inspections. The volume of the detected deposit pile is not evaluated. In many cases the growing defects are located at the same area as the magnetite deposit piles. For this reason it is important to locate and to size the piles of magnetite on the steam generator tubing. In this study experiments were conducted by using eddy current method using bobbin probe techniques and small mock-up simulating the horizontal steam generator tubing. The goal of the experiment was to size the thickness of magnetite piles under and around the test tubes. The results of low frequency tests showed that the thickness of magnetite layer under the steam generator tube can be measured up to 11 mm. The results of the tests showed also that in more general case, where the tube is embedded into unsymmetrical pile, the pile thickness cannot be measured using ordinary single probe technique.
    Original languageEnglish
    Title of host publicationBaltica IX. International Conference on Life Management and Maintenance for Power Plants
    EditorsPertti Auerkari, Juha Veivo
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Pages603-610
    ISBN (Print)978-951-38-8025-5, 978-951-38-8026-2
    Publication statusPublished - 2013
    MoE publication typeA4 Article in a conference publication
    EventBALTICA IX - International Conference on Life Management and Maintenance for Power Plants - Helsinki-Stockholm, Finland
    Duration: 11 Jun 201313 Jun 2013

    Publication series

    NameVTT Technology
    PublisherVTT
    Number106
    ISSN (Print)2242-1211
    ISSN (Electronic)2242-122X

    Conference

    ConferenceBALTICA IX - International Conference on Life Management and Maintenance for Power Plants
    CountryFinland
    CityHelsinki-Stockholm
    Period11/06/1313/06/13

    Fingerprint

    Magnetite
    Steam generators
    Tubing
    Eddy currents
    Piles
    Deposits
    Bobbins
    Inspection
    Experiments
    Defects
    Networks (circuits)

    Cite this

    Jäppinen, T., & Lahdenperä, K. (2013). Detection of magnetite piles on steam generator tubing with eddy current method. In P. Auerkari, & J. Veivo (Eds.), Baltica IX. International Conference on Life Management and Maintenance for Power Plants (pp. 603-610). Espoo: VTT Technical Research Centre of Finland. VTT Technology, No. 106
    Jäppinen, Tarja ; Lahdenperä, Kari. / Detection of magnetite piles on steam generator tubing with eddy current method. Baltica IX. International Conference on Life Management and Maintenance for Power Plants. editor / Pertti Auerkari ; Juha Veivo. Espoo : VTT Technical Research Centre of Finland, 2013. pp. 603-610 (VTT Technology; No. 106).
    @inproceedings{67f7ba782a4146ca9b06f68cce11cb22,
    title = "Detection of magnetite piles on steam generator tubing with eddy current method",
    abstract = "The magnetite deposits and deposit piles on the secondary circuit of the steam generator tubing are detected with eddy current method in in-service inspections. The volume of the detected deposit pile is not evaluated. In many cases the growing defects are located at the same area as the magnetite deposit piles. For this reason it is important to locate and to size the piles of magnetite on the steam generator tubing. In this study experiments were conducted by using eddy current method using bobbin probe techniques and small mock-up simulating the horizontal steam generator tubing. The goal of the experiment was to size the thickness of magnetite piles under and around the test tubes. The results of low frequency tests showed that the thickness of magnetite layer under the steam generator tube can be measured up to 11 mm. The results of the tests showed also that in more general case, where the tube is embedded into unsymmetrical pile, the pile thickness cannot be measured using ordinary single probe technique.",
    author = "Tarja J{\"a}ppinen and Kari Lahdenper{\"a}",
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    language = "English",
    isbn = "978-951-38-8025-5",
    series = "VTT Technology",
    publisher = "VTT Technical Research Centre of Finland",
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    booktitle = "Baltica IX. International Conference on Life Management and Maintenance for Power Plants",
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    Jäppinen, T & Lahdenperä, K 2013, Detection of magnetite piles on steam generator tubing with eddy current method. in P Auerkari & J Veivo (eds), Baltica IX. International Conference on Life Management and Maintenance for Power Plants. VTT Technical Research Centre of Finland, Espoo, VTT Technology, no. 106, pp. 603-610, BALTICA IX - International Conference on Life Management and Maintenance for Power Plants, Helsinki-Stockholm, Finland, 11/06/13.

    Detection of magnetite piles on steam generator tubing with eddy current method. / Jäppinen, Tarja; Lahdenperä, Kari.

    Baltica IX. International Conference on Life Management and Maintenance for Power Plants. ed. / Pertti Auerkari; Juha Veivo. Espoo : VTT Technical Research Centre of Finland, 2013. p. 603-610 (VTT Technology; No. 106).

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    TY - GEN

    T1 - Detection of magnetite piles on steam generator tubing with eddy current method

    AU - Jäppinen, Tarja

    AU - Lahdenperä, Kari

    PY - 2013

    Y1 - 2013

    N2 - The magnetite deposits and deposit piles on the secondary circuit of the steam generator tubing are detected with eddy current method in in-service inspections. The volume of the detected deposit pile is not evaluated. In many cases the growing defects are located at the same area as the magnetite deposit piles. For this reason it is important to locate and to size the piles of magnetite on the steam generator tubing. In this study experiments were conducted by using eddy current method using bobbin probe techniques and small mock-up simulating the horizontal steam generator tubing. The goal of the experiment was to size the thickness of magnetite piles under and around the test tubes. The results of low frequency tests showed that the thickness of magnetite layer under the steam generator tube can be measured up to 11 mm. The results of the tests showed also that in more general case, where the tube is embedded into unsymmetrical pile, the pile thickness cannot be measured using ordinary single probe technique.

    AB - The magnetite deposits and deposit piles on the secondary circuit of the steam generator tubing are detected with eddy current method in in-service inspections. The volume of the detected deposit pile is not evaluated. In many cases the growing defects are located at the same area as the magnetite deposit piles. For this reason it is important to locate and to size the piles of magnetite on the steam generator tubing. In this study experiments were conducted by using eddy current method using bobbin probe techniques and small mock-up simulating the horizontal steam generator tubing. The goal of the experiment was to size the thickness of magnetite piles under and around the test tubes. The results of low frequency tests showed that the thickness of magnetite layer under the steam generator tube can be measured up to 11 mm. The results of the tests showed also that in more general case, where the tube is embedded into unsymmetrical pile, the pile thickness cannot be measured using ordinary single probe technique.

    M3 - Conference article in proceedings

    SN - 978-951-38-8025-5

    SN - 978-951-38-8026-2

    T3 - VTT Technology

    SP - 603

    EP - 610

    BT - Baltica IX. International Conference on Life Management and Maintenance for Power Plants

    A2 - Auerkari, Pertti

    A2 - Veivo, Juha

    PB - VTT Technical Research Centre of Finland

    CY - Espoo

    ER -

    Jäppinen T, Lahdenperä K. Detection of magnetite piles on steam generator tubing with eddy current method. In Auerkari P, Veivo J, editors, Baltica IX. International Conference on Life Management and Maintenance for Power Plants. Espoo: VTT Technical Research Centre of Finland. 2013. p. 603-610. (VTT Technology; No. 106).