Demand of natural gas continues to increase in the recent years due to the rise of environmental issue and the drastic increase of crude oil price. These events led the increase of constructions of LNG storage tanks worldwide. The inner tank material for above ground LNG storage tanks have mostly been made of a 9% nickel steel plate over the last 50 years as it has excellent mechanical properties under the cryogenic temperature of −160deg-C. During this period, the LNG storage tanks made of 9%Ni steel plate have safely been operated at the many LNG export and import terminals in the world. Meanwhile, technologies of steel making, refinement, design, analysis, welding and inspection have been improved significantly and enable us to achieve enlarging volumetric capacity of the tank to 2–3 times. There was a tendency of increase in nickel price in the recent years and hence the preparation corresponding to the risk to a great rise on the price of 9%Ni steel plate becomes necessary. In such a circumstance lowering Ni content was focused attention on the 9%Ni steel as nickel is an expensive and valuable rare metal and the 7%Ni steel plate was eventually researched and developed. It was a steel making process so that a 7%Ni steel would be made by adjustment of chemical compositions and processed by suitable Thermo–Mechanical Controlled Process (TMCP). As a result, it was demonstrated that 7%Ni-TMCP steel plate had excellent physical and mechanical properties equivalent to those of 9%Ni steel plate. In order to evaluate fitness of the 7%Ni-TMCP steel plate and its weld for LNG storage tanks a series of testing was conducted. Several different kinds of plate thicknesses i.e. 6,10,25,40 and 50 mm were chosen to run large scale fracture toughness tests such as duplex ESSO tests, cruciform wide plate tests as well as small scale tests. In this study, a comprehensive assessment was performed to confirm applicability of the 7%Ni -TMCP steel plate and its weld to LNG storage tanks. It was concluded that the 7%Ni-TMCP steel plate warrants serious consideration for use in LNG storage tanks. This paper reports details of the research and development of the 7%Ni-TMCP steel plate.
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ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering
June 19–24, 2011
Rotterdam, The Netherlands
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4435-9
PROCEEDINGS PAPER
Development of 7%Ni-TMCP Steel Plate for LNG Storage Tanks Available to Purchase
Takahiro Kamo,
Takahiro Kamo
Sumitomo Metal Industries, Ltd., Kashima, Japan
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Kazushige Arimochi,
Kazushige Arimochi
Sumitomo Metal Industries, Ltd., Amagasaki, Japan
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Tomoya Kawabata,
Tomoya Kawabata
Sumitomo Metal Industries, Ltd., Amagasaki, Japan
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Kazushi Onishi,
Kazushi Onishi
Sumitomo Metal Industries, Ltd., Osaka, Japan
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Ryuichi Andou,
Ryuichi Andou
Sumitomo Metal Industries, Ltd., Tokyo, Japan
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Maki Yamashita,
Maki Yamashita
Osaka Gas Co., Ltd., Osaka, Japan
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Hiroshi Iwahashi,
Hiroshi Iwahashi
Osaka Gas Co., Ltd., Osaka, Japan
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Naoshige Kubo,
Naoshige Kubo
Osaka Gas Co., Ltd., Osaka, Japan
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Yoichi Fuchimoto,
Yoichi Fuchimoto
Osaka Gas Co., Ltd., Osaka, Japan
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Masanori Takata,
Masanori Takata
Osaka Gas Engineering Co., Ltd., Osaka, Japan
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Naokazu Sakato,
Naokazu Sakato
Toyo Kanetsu K.K., Tokyo, Japan
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Masahiko Mitsumoto,
Masahiko Mitsumoto
Toyo Kanetsu K.K., Tokyo, Japan
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Syuichi Hirai,
Syuichi Hirai
Toyo Kanetsu K.K., Tokyo, Japan
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Hitoshi Hirose,
Hitoshi Hirose
GH Engineering Consultants Co., Ltd., Tokyo, Japan
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Yukito Hagihara
Yukito Hagihara
Sophia University, Tokyo, Japan
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Takahiro Kamo
Sumitomo Metal Industries, Ltd., Kashima, Japan
Kazushige Arimochi
Sumitomo Metal Industries, Ltd., Amagasaki, Japan
Tomoya Kawabata
Sumitomo Metal Industries, Ltd., Amagasaki, Japan
Kazushi Onishi
Sumitomo Metal Industries, Ltd., Osaka, Japan
Ryuichi Andou
Sumitomo Metal Industries, Ltd., Tokyo, Japan
Maki Yamashita
Osaka Gas Co., Ltd., Osaka, Japan
Hiroshi Iwahashi
Osaka Gas Co., Ltd., Osaka, Japan
Naoshige Kubo
Osaka Gas Co., Ltd., Osaka, Japan
Yoichi Fuchimoto
Osaka Gas Co., Ltd., Osaka, Japan
Masanori Takata
Osaka Gas Engineering Co., Ltd., Osaka, Japan
Naokazu Sakato
Toyo Kanetsu K.K., Tokyo, Japan
Masahiko Mitsumoto
Toyo Kanetsu K.K., Tokyo, Japan
Syuichi Hirai
Toyo Kanetsu K.K., Tokyo, Japan
Hitoshi Hirose
GH Engineering Consultants Co., Ltd., Tokyo, Japan
Yukito Hagihara
Sophia University, Tokyo, Japan
Paper No:
OMAE2011-49149, pp. 113-122; 10 pages
Published Online:
October 31, 2011
Citation
Kamo, T, Arimochi, K, Kawabata, T, Onishi, K, Andou, R, Yamashita, M, Iwahashi, H, Kubo, N, Fuchimoto, Y, Takata, M, Sakato, N, Mitsumoto, M, Hirai, S, Hirose, H, & Hagihara, Y. "Development of 7%Ni-TMCP Steel Plate for LNG Storage Tanks." Proceedings of the ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. Volume 3: Materials Technology; Jan Vugts Symposium on Design Methodology of Offshore Structures; Jo Pinkster Symposium on Second Order Wave Drift Forces on Floating Structures; Johan Wichers Symposium on Mooring of Floating Structures in Waves. Rotterdam, The Netherlands. June 19–24, 2011. pp. 113-122. ASME. https://doi.org/10.1115/OMAE2011-49149
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