Creep analyses of a steam pipe system

Jan Storesund, Kristin Steingrimsdottir, Juhani Rantala, Tobias Bolinder

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


    Elastic pipe stress analyses are frequently performed to check that the stresses in pipe systems are allowed. For operation in the creep range such analyses may describe the stress distribution in the beginning but not after creep relaxation starts to take place. In the present work effects of creep are considered. A pipe system of P22 material that had been analysed by software for elastic analysis was also modelled for creep. By use of tabled creep data the following was studied: - Creep stress relaxation in the pipe system, - The effects of starts and stops on stress and strain distributions, - Creep in T-pieces with super imposed system stresses from the pipe system creep analysis. The creep properties of a virgin weld and a service exposed weld were determined by impression creep testing. The tests were performed in the parent metal, different parts of the HAZ and the weld metal. A weld was included in the model and analysed with these data. Resulting creep strain distributions from analyses with tabled and present creep test data were compared to each other and also to actual creep damage that was observed in components from the system.
    Original languageEnglish
    Title of host publicationBaltica X
    Subtitle of host publicationInternational Conference on Life Management and Maintenance for Power Plants
    EditorsPertti Auerkari
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Number of pages16
    ISBN (Electronic)978-951-38-8436-9, 978-951-38-8435-2
    Publication statusPublished - 2016
    MoE publication typeA4 Article in a conference publication
    EventBALTICA X - International Conference on Life Management and Maintenance for Power Plants - Cruise, Helsinki-Stockholm, Finland
    Duration: 7 Jun 20169 Jun 2016

    Publication series

    SeriesVTT Technology


    ConferenceBALTICA X - International Conference on Life Management and Maintenance for Power Plants
    Abbreviated titleBaltica X


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