Assessment of The Longevity of Aquarius Class LNG Carriers(eBook)

Published Date

January 1996

Assessment of The Longevity of Aquarius Class LNG Carriers(eBook)

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This paper describes the results of a study into the longevity of an 8 ship LNG fleet, concluding a life of at least 34 years if well maintained. (13pp)

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One way to reduce shipping costs is to utilize existing tankers instead of building new ones. However, since safety and reliability are of prime importance in the LNG industry, the ultimate longevity of existing LNG tankers is crucial to the decision whether to build expensive new ships or to utilize existing ones.

In 1994 a Task Force of companies from many nations completed a comprehensive study of the longevity of an eight-ship LNG fleet that was built in the 1970's and which had carried more than 2,000 LNG cargoes between Indonesia and Japan during the previous 17 years. The Task Force included the Indonesian national oil company, PERTAMINA (the world's largest exporter of LNG) and its LNG Production Sharing Contractors (TOTAL Indonesia, UNOCAL Indonesia and VICO Indonesia), Burmah Gas Transport, Inc. (the fleet's transporter) and a group of Japanese LNG buyers comprised of Chubu Electric Co., Kansai Electric Co., Kyushu Electric Co., Osaka Gas Co., Toho Gas Co., and Nippon Steel Co.

The Task Force, selected Lloyd's Register (LR) as an independent expert to carry out extensive inspection surveys, review of maintenance records and stress/fatigue analysis of the hull and cargo containment systems. In addition, a computer simulation program was developed which performs statistical analysis upon repair periods and frequencies which allows concentrating maintenance effort upon the critical items.

Besides being far more comprehensive than other studies previously done on 20-year old ships, the study includes the following unique features:
– structural integrity analysis using actual wave load conditions instead of original design conditions
– finite element stress analysis to analyze fatigue in the hull and cargo containment systems
– crack propagation analysis on existing minor faults in cargo tanks
– The study was a joint effort between the Seller, the Buyers and the Transporter, the first time such a cooperative effort has been accomplished.

The study concluded that the Burmah ships are able to carry LNG reliably and safely through at least the year 2010 (34 years total), provided the fleet continues to be as well maintained as it has been in the past.

Paper delivered by:
Rusli Yusuf (Pertamina)
Hisaichi Yoneyama (Osaka Gas Co Ltd)
Gary Gentry (VICO Services Inc)
Bertrand Lanquetin (TOTAL)
Takayuki Higashijima (Kansai Electric Power Co Inc)
Anaya Wardhana (Pertamina)
Edmund G Tornay (Energy Transportation Corp)

Prepared for:
Gastech Vienna 1996

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: Assessment of The Longevity of Aquarius Class LNG Carriers(eBook)
Product Code: 4433G023
Published Date: January 1996

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