The double wall tank consists of a structural inner or primary barrier supported by internal webs and stiffeners and a structural outer or secondary barrier connected to the primary barrier by web plates between barriers. The two barriers have independent containment surfaces but utilize a common internal system of webs and stiffeners. The barriers are spaced far enough apart to allow access space between them for construction and visual inspection of both barriers. To facilitate access, as well as to save weight, the two barriers are constructed of corrugated plate. The inner tank serves to contain the liquid under normal condition. The purpose of the secondary barrier, is to serve as standby containment of the LNG in case of leak or failure of the primary barrier. The insulation is external of the secondary barrier, to assure that there would be no reduction in conventional hull material temperature in the event of a leak in the primary barrier. Designs for the double wall tank utilize either 5083-0 aluminum alloy or 9 percent nickel steel, both materials being suitable for LNG containment at a service temperature of minus 260 F and both of which have been used successfully for shore storage and ship transportation application.

  • Authors:
    • Bridges, T F
  • Publication Date: 1971-1

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00032155
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Apr 21 1972 12:00AM