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Title: Experience In Japanese Gas Industry On Nine Percent Nickel Steel LNG Storage Tanks
Author: Hisashi Miyakoshi, Noriyoshi Ishikura, Tetsuro Suzuki, Kiyoshi Tanaka
Source: American Gas Association 1981
Year Published: 1981
Abstract: Research efforts on welding and fracture of land based LNG storage tanks paid by Japanese steel makers, tank fabricators and gas suppliers are reviewed. Differences among Japanese, American and European regulations concerning allowable design stress are also studied. After extensive and careful investigation was conducted on fracture characteristics of 9% nickel steel plates and their welded joints, they are now considered to have enough high toughness to arrest a running crack in case it is created at one of the most embrittled regions such as welded joints. As for automatic welding methods, the gas tangusten arc welding method seems to be most advantageous because weld metal deposition rate and penetration can be controlled independently by the method. Primary design stress applied in Japan for the LNG tanks is in accordance with ASME Sec. VIII Div. 1 and lower than the design levels in the United Slates and Europe.

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