Sweep survey methods such as the multibeam echo sounder and side scan sonar are used to investigate and determine the height span of an undersea LNG (liquefied natural gas) pipeline. Such methods to monitor seafloor targets have proved to be beneficial because they are more convenient, efficient, economical, and less risky than other survey equipment. Taiwan-based CPC (Chinese Petroleum Corp.) laid an LNG pipeline under the sea using side scan sonar image-forming geometry. The multibeam transducer used in the survey was Reson Inc.'s SeaBat 810 that has a full beam width of 120 degree and is composed of 80 beams. The results, according to the calculations, estimate the span height by comparing the side scan image with the field-investigated figures using the ROV (Remotely Operated Vehicle). CPC also hired a marine company to double-check the free-span locations using a ROV equipped with robot arms to lay bags at the free-span gap.


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    Title :

    Undersea LNG pipeline span investigation


    Additional title:

    Stützweitenuntersuchung einer Unterwasser-Flüssiggasrohrleitung


    Contributors:

    Published in:

    Sea Technology ; 47 , 7 ; 41-43


    Publication date :

    2006


    Size :

    3 Seiten



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English







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