Creep damage and long term life modelling of an X20 steam line component

Pertti Auerkari, Jorma Salonen (Corresponding Author), Stefan Holmström, anssi Laukkanen, Juhani Rantala, R. Nikkarila

    Research output: Contribution to journalArticleScientificpeer-review

    5 Citations (Scopus)

    Abstract

    Hot steam lines operate at high temperatures and are designed against creep. In service they will consume the creep life at the highest rate in locations with the most adverse combination of material strength (weakness) and high stress (e.g. system loads). Adverse effects in stress state are promoted by features of geometry and discontinuities in the materials properties. In practice it is essential to find the areas of maximum damage, as these will determine the locations and timing to inspect and finally to repair or replace before failures or unplanned outages. The inspection experience from power plant steam systems have provided the established views on the expected locations of the early creep damage, and rules on timing the next inspection. The experience has also shown that optimal timing is materials dependent, and that the steel grade X20CrMoV11-1 (X20, 11% Cr steel) performs particularly well in the inspection statistics. This paper describes a case with observed creep cavitation and cracking in a branch weld of a X20 steam header that was replaced after 135,000 service hours. The characteristics of the observed damage and its evolution are discussed.
    Original languageEnglish
    Pages (from-to)508-515
    Number of pages7
    JournalEngineering Failure Analysis
    Volume35
    DOIs
    Publication statusPublished - 2013
    MoE publication typeA1 Journal article-refereed

    Keywords

    • creep
    • life time estimation
    • modelling
    • steam line
    • ProperTune

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