A review of the inspection results from four pressure vessel shells revealed that the use of HIC-resistant steels was not a total cure to the problem of wet H2S related cracking. It did appear, however, that the HIC-resistant steels are better than conventional steels in resisting cracking. A number of observations can be made from the data to support these conclusions: 1) In two of the four shells examined, WFMT indications (Wet Fluorescent Magnetic Particle Testing) were identified in HIC-resistant material. Indications were detected in one additional shell but were reported to be associated with fabrication flaws. 2) In three instances, HIC-resistant steel clearly produced fewer cracks than had been observed with conventional SA516 steel. 3) Some blistering was noted in a HIC-resistant steel. 4) HIC-resistant steel undergoing PWHT following service exposure did not generate / open up cracking that could be detected by WFMT after PWTH (Post-Weld Heat Treatment). 5) UT shearwave inspection of three of the HIC-resistant shells did not uncover any evidence of subsurface SOHIC cracking. Such cracking has been observed in some laboratory corrosion studies of HIC-resistant steels. However, the examples cited in this review may support the belief that the laboratory studies are overly conservative and do not represent actual field conditions. 6) In three of the four exchangers examined cracking of non-HIC-resistant steel appeared to be worse after the initial WFMT inspection. This may support some recent industry studies, which indicated that grit blasting to prepare the steel surface for WFMT may make the steel more susceptible to hydrogen charging and subsequent cracking. HIC-resistant steels did not appear to exhibit a tendency towards increased cracking after being returned to service following a WFMT inspection.


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    Titel :

    Wet H2S cracking - a refiner's experience with HIC-resistant steels


    Weitere Titelangaben:

    Wasserstoffinduzierte Rißbildung in feuchter H2S-haltiger Umgebung - die Erfahrungen eines Raffineriebetreibers mit HIC-beständigen Stählen


    Beteiligte:
    Danis, J.I. (Autor:in)

    Erschienen in:

    Corrosion, 1999 ; 431/1-431/7


    Erscheinungsdatum :

    1999


    Format / Umfang :

    7 Seiten, 3 Bilder, 3 Tabellen, 7 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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