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    STP579

    Significance of Defects in Liquefied Natural Gas Tanks in Ships

    Published: 01 January 1975


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    Abstract

    The commonly encountered defects in welding of 9 percent nickel steel and aluminum alloy 5083-0 for liquefied natural gas tanks are described, and their significance with respect to fatigue crack propagation and fracture in ship tanks is discussed. Fracture mechanics testing and analysis have been applied. Diagrams describing the growth in depth and length of surface cracks in welded joints as a function of long term distribution of dynamic stresses for North Atlantic service are presented. The possibilities and limitations of the presently used nondestructive testing methods are treated.

    Keywords:

    storage tanks, cracking (fracturing), fatigue (materials), aluminum alloys, nickel steels, fracture properties, defects, nondestructive tests


    Author Information:

    Tenge, P
    Principal surveyor and head, senior surveyor, and research engineer, Det norske Veritas' Division for Materials Engineering and Inspection, Oslo,

    Solli, O
    Principal surveyor and head, senior surveyor, and research engineer, Det norske Veritas' Division for Materials Engineering and Inspection, Oslo,

    Förli, O
    Principal surveyor and head, senior surveyor, and research engineer, Det norske Veritas' Division for Materials Engineering and Inspection, Oslo,


    Committee/Subcommittee: E50.01

    DOI: 10.1520/STP29154S