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LNG Tank-Its Structure, the Materials and Welding Techniques Yasunosuke OGAWA, Mitsuhiro SAKAMOTO, Kiyoaki TOYOMASU, Mitsuo OHYAMA, Munemitsu FUKAGAWA, and Yoshinori SAIGA

Table 2. Material list for various equipments of LNG plant. Fig. 2. General plan of double wall-dome roof on-ground LNG tank. Fig. 3. CSS (Composite Shell Segment) type inground LNG tank.

Table 3. Physical properties of low temperature materials for LNG4). Table 5. Specifications for nickel alloy steels (Mechanical properties). Fig. 5. Temperature dependence of tensile properties of 9%Ni steel (base metal)4).

Fig. 6. Charpy transition curves of 9% Ni steel, showing the effect of cooling rate after tempering heat treatment on absorbed energy at low temperature5).

Fig. 10. Comparison of absosbed energy of 9% Ni steel (24min thick) in longitudinal and transverse directions to rolling direction7).

Table 6. Specifications for 304 stainless steel, 5083 aluminum alloy and invar. Table 7. Examples of charpy absorbed energy on 304 SS and INVAR4).

Table 8. Examples of welding materials for 9% Ni steel.

Table 9. Examples of welded joints (9% nickel steel). Fig. 14. Test results of wide plate welded testplates with angular distortion and mis alignment (9% nickel steel). Fig. 13. Examples of hardness distribution at weld joint (9% nickel steel)