In order to verify the possible application of high pressure, long distance natural gas transportation, in 1995 E.N.I. sponsored a research program. This activity had been developed by SNAM jointly with CSM in order to assess the fracture behaviour of large diameter (up to 1442 mm), heavy wall thickness (up to 30 mm), high steel grade (API 5L X70 and X80) pipes for operating pressure over 15 MPa by means of both laboratory and full scale tests. The assessment of the fracture behaviour of large diameter, higher steel grade (X100) pipes operated at very high pressure (up to 15 MPa) is meant to be the ideal carrying on of this project. So a research program on behalf of ECSC (European Coal and Steel Community) is being carried out by a joint co-operation among CSM, Snam and Europipe. Aim of this research is to define appropriate safety criteria against fracture phenomena in large diameter, X 100 SAW pipes operated at very high pressure by determining a range of fracture properties using both laboratory and full-scale tests. In particular specific objective of this activity is the definition of material requirements for arresting fast propagating ductile fracture. The Ductile Fracture Propagation control for very high grade pipes is one of the key point to be solved in order to have complete safety in their application. The available knowledge indicate this aspect could be a critical point for future use of large diameter, very high strength steel gas pipelines, operated in severe conditions (i.e. hoop stress >450 MPa). On the other hand the conventional methods for assessing the toughness requirements in linepipe are recognised to be inadequate to characterise fracture resistance in modern ultra high grade linepipe steels. No experiences on this innovative high grade steel operated at so high hoop stress levels have been performed in the past, and therefore a specific full-scale experimental activity is necessary to investigate this aspect.


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    Title :

    Large diameter X100 gas linepipes: fracture propagation evaluation by full-scale burst test


    Additional title:

    X100-Gasleitungen mit grossem Durchmesser: Bewertung der Rissausbreitung durch einen Berstversuch im Originalmaßstab


    Contributors:


    Publication date :

    2000


    Size :

    12 Seiten, 8 Bilder, 1 Tabelle, 7 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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