A total of 15 prismatic cargo-tanks are being constructed by Kaiser Aluminum & Chemical Corp. for three 125,000-cu m LNG carriers; these are being built by Avondale Shipyards and are due for completion in 1978. The tanks, of welded construction, were designed by Conch Methane Services and are made from Kaiser's 5083 aluminium plate, extrusions, and forgings. The largest tanks are about 120 ft long, 120 ft wide, and 75 feet deep, and weigh about 860 tonnes; the smallest weigh about 640 tonnes. The article describes the methods used in the construction of these tanks. Panels, weighing up to 54 tonnes, are fabricated at Wilmington, North Carolina, and shipped to Mobile, Alabama, on a sea-going barge capable of carrying all 24 panels for each tank. At Mobile, on a 35-acre erection site, the tanks are assembled from the panels, and internal piping is installed; the article includes brief information on the training of the welders, on the use of concrete-anchored "tie-downs" for surrounding the tanks under construction during the hurricane season, and on the movable "welding towers" positioned at the tank exterior to give the welder and the seam protection during bad weather. It is mentioned that prolonged wet weather has resulted in costly delays in production. Automatic gas metal-arc welding is used for all tank seams, and semi-automatic for the brackets and other small parts. The welding procedures, weld inspection, and the pressure-testing and final cleaning of the completed tanks are described. The insulation of the ships' holds, which is carried out by Kaiser at Avondale Shipyards, New Orleans, is also described; after the insulation has been completed and tested, each ship is towed to Mobile for the tanks to be installed. A 320-ft high twin-boom derrick was specially designed for lifting the tanks into the ship; each tank is moved to the derrick by four 272-tonne crawlers, also specially designed.

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  • Corporate Authors:

    American Welding Society

    2501 NW 7th Street
    Miami, FL  United States  33125
  • Publication Date: 1977-11

Media Info

  • Pagination: 2 p.
  • Serial:
    • Welding Journal
    • Volume: 56
    • Publisher: American Welding Society
    • ISSN: 0043-2296

Subject/Index Terms

Filing Info

  • Accession Number: 00180047
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Sep 14 1978 12:00AM