A Study on LPG Storage Tank with High Crack-Arrestability

概要

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Criteria for safety of LPG storage tank has ever been based on toughness against fracture initation. However, the double integrity concept requesting high crack-arrestability is proposed recently to prevent the tank yard from total destruction. In this present study, the influence of low Ni content of base metals and weld metals on fracture characteristics was investigated to establish the new welding procedure for LPG tank with high arrestability.As the results, welded joints with newly developed 2.5 (3.5) %Ni steel and low Ni content weld metal hold sufficient tensile strength and bending characteristics, and Kc-value of these welded joints is high enough to prevent fracture initiation. Even if fracture initiated, Kca-value is high enough to arrest a long crack in case Ni content of weld metal is more than 6%.
一般社団法人日本高圧力技術協会の論文