With the international transportation networks of oil and gas pipelines aging, ABI (automated ball indentation) testing provides a means of monitoring their structural integrity, particularly important in high-consequence areas. Pipeline rehabilitation concerns are coupled with the demands of meeting current and future energy demands by safely safely increasing transmission throughput. This article describes applications of a SSM (stress-strain microprobe) system using an in situ nondestructive ABI test technique to measure stress-strain curves and fracture toughness properties of in-service steel pipelines. The SSM system provides key mechanical properties (tensile and fracture toughness) from each single ABI test in a nondestructive and localized fashion without any interruption to the pipeline transmission service. Integration of SSM measurements with the conventional, non-destructive inspection results (crack-flaw size and corrosion pitting profile measurements) allows calculation the maximum safe operating pressure and determination of replacement of repair of older pipelines. The quality of seam welds and gith welds in repair jobs or in new pipeline construction, particularly for high strength grades such as X-80 to X-120, also can be quantified thoroughly from their ABI-measured fracture-toughness values and tensile properties. True verification of weld overmatch, mandated for the strain-based design of arctic or earthquake-prone pipeline applications, requires this quantification. ABI-measured fracture toughness values do not depend on material-thickness for pipelines and pressure vessels with thickness greater than 5 mm. Using ABI-determined reference temperature, and the fracture toughness master curve concept allows calculation of the critical flaw size for any operating temperature.


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    Title :

    Indentation technique provides pipeline integrity monitoring


    Additional title:

    Mit Härteeindrucktests kann die Intaktheit einer Pipeline überwacht werden


    Contributors:

    Published in:

    Oil and Gas Journal ; 104 , 30 ; 58-62


    Publication date :

    2006


    Size :

    5 Seiten, 5 Bilder, 2 Tabellen, 6 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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