As part of a project to supply gas to Britain from Norway in 2007, there was a requirement to build a new gas export pipeline and connect it into an existing highpressure gas transportation pipeline. This connection was made by means of a 16-inch hot-tap into a 36-inch line i.e. welding a 16-inch stub on to a 36-inch pipe while the pipe is live carrying gas. The additional challenge was that the location of this work was 400 km offshore in the North Sea and at 140 m water depth. Due to the nature of the work, there was a major risk to safety and the environment; therefore it was vital that the connection was welded and tested to extremely high standards. The ENIQ methodology (European Network for Inspection and Qualification) was used to enable a rigorous and structured approach to be adopted. A high sensitivity automated ultrasonic inspection was developed and qualified such that there was extreme confidence that a reliable test could be performed. Following this exercise the hot tap weld was satisfactorily inspected and the whole project completed without concern.


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    Title :

    Development, validation and execution of the automated ultrasonic testing of a subsea pipeline hot tap weld


    Additional title:

    Entwicklung, Validierung und Durchführung der automatischen Ultraschallprüfung von Schweißnähten an Meerespipelines


    Contributors:


    Publication date :

    2008


    Size :

    8 Seiten, 8 Bilder


    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




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