The Study of the Tank System of a 125000 M3 MRV Type LNG Carrier (Thermal Leak Before Failure and Buckling Analysis) (eBook)

Published Date

January 1982

The Study of the Tank System of a 125000 M3 MRV Type LNG Carrier (Thermal Leak Before Failure and Buckling Analysis) (eBook)

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This paper describes the results of studies on temperature distribution, thermal stress, the "leak before failure concept" and buckling strength. (23pp)

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At present three liquified natural gas (LNG) carriers of Moss Rosenberg Verft (MRV) spherical tank type are being built at Nagasaki Shipyard and Engine Works of Mitsubishi Heavy Industries Ltd.(MHI). The first of the carriers has been launched and work on tank insulation and auxiliary fittings is being completed as scheduled. All these ships are of the 125,000 m3 LNG loading capacity and will be commissioned for Indonesia-Japan LNG transportation service.

MRV type LNG carrier is one of the most safe LNG transportation systems and has obtained conceptual design approval by all major classification societies. In addition, and up to now, Det Norske Veritas (DNV), American Bureau of Shipping and Nippon Kaiji Kyokai have given their detailed approval of ships already built or on order. Since 1973, all together 20 LNG carriers of this design have been delivered and proved their excellent service experience. MHI entered into a technical agreement with MRV in 1971,and since then, has carefully studied the safety aspects of the LNG carriers by ourselves as introduced at the last conference (GASTECH '81).

The previous report1 includes an outline of MHI's research programmes on the safety aspects of MRV type LNG carrier and specific items such as ship motions, wave loads, and stress analyses of the hull and tank system. This paper deals with the results of our studies on three key design factors of the tank system. The first concerns the temperature distribution and thermal stress of the tank during cooling down, the second concerns the safety of the tank based on "leak before failure concept", and the last relates to the buckling strength of the spherical cargo tank and its supporting cylindrical skirt. We carried out not only theoretical, analysis but also large–scale model experiments for verification. However, for the sake of brevity and clarity, the following discusses only the major findings of our study.

Paper delivered by:
Dr R Nagamoto
Dr M Matoba
Y Kuramoto,
Y Kobayashi
M Ushijima
D. Sakai (all of Mitsubishi Heavy Industries Ltd., Nagasaki, Japan)

Prepared for:
Gastech Paris 1982

For over 45 years, the Gastech Exhibition & Conference has been at the forefront of the international gas and LNG market. This world-renowned event is regarded as the most significant meeting place for gas and LNG professionals, where the global industry gathers to do business.

Gastech hosts major IOCs, NOC’s, global utility companies, EPC contractors, shipbuilders, pipeline companies, manufacturers, distributors, technology and service providers, all who play an active role in the global energy value chain.

Title: The Study of the Tank System of a 125000 M3 MRV Type LNG Carrier (Thermal Leak Before Failure and Buckling Analysis) (eBook)
Product Code: 4433g177
Published Date: January 1982

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