The following cases of hydrogen influence on pipeline metal were considered: gaseous hydrogen under internal pressure in notched pipes and electrochemically generated hydrogen on external pipe surface from soil aqueous environment. The burst tests of externally notched pipes under pressure of hydrogen and natural gas (methane) were carried out after the pipe has been exposed to a constant 'holding' pressure. It has been shown that even for relatively 'soft' test conditions (holding pressure p = 20 bar and ambient temperature) the gaseous hydrogen is able to penetrate into near surface layers of metal and to change the mechanism of local fracture at notch. The sensitivity to hydrogenating of given steel API X52 in deoxygenated, near-neutral pH NS4 solution under soft cathodic polarisation was studied and the assessment local strength at notches in pipeline has been made for this conditions. Here, the relationship between hydrogen concentration and failure loading has been found. The existence of some critical hydrogen concentration, which causes the significant loss of local fracture resistance of material, was also shown. The work described in this paper was performed within the European project NATURALHY work package on 'Durability of pipeline material'.


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    Title :

    Sensitivity of pipelines with steel API X52 to hydrogen embrittlement


    Contributors:
    Capelle, J. (author) / Gilgert, J. (author) / Dmytrakh, I. (author) / Pluvinage, G. (author)

    Published in:

    Publication date :

    2008


    Size :

    12 Seiten, 21 Bilder, 6 Tabellen, 30 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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