Development of Shipboard Reliquefaction Systems for LNG Carriers (eBook)

Published Date

January 2006

Development of Shipboard Reliquefaction Systems for LNG Carriers (eBook)

(Excludes any applicable taxes)

This paper outlines the development history of reliquifaction systems, from the patented concept to the refined units that are currently being offered. (17pp)

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Reliquefaction systems have been proposed and considered at regular intervals ever since the building of LNG carriers started in earnest around 1970. The systems proposed in the past were rejected due to excessive cost, space requirements and power consumption. However, during the last 30 years, the efficiency of slow speed diesel propulsion has increased dramatically in comparison with the steam turbine plants used on LNG carriers, and it was recognized that reliquefaction of boil-off gas in combination with diesel propulsion would result in significant LNG transportation cost reduction.

About 10 years ago, Moss Maritime AS accordingly decided to develop a reliquefaction system of their own. The development work resulted in the Moss RSTM concept, which was patented and presented in 1995. The concept is based on reliquefaction at elevated pressure and the use of nitrogen as refrigerant. Since the initial presentation, the system has been further refined and simplified and a world-wide marketing and construction license has been granted to Hamworthy Gas Systems AS. At the time of writing, this company has orders for 23 large LNG newbuildings. This paper will outline the development history from the patented concept to the refined units which are being offered at present. The system thermodynamics, mechanical design and arrangement will be reviewed in detail, as well as various installation options.

It will be shown how classification requirements are being complied with and how technical and financial challenges have been addressed to arrive at the highly compact and cost-effective concept offered to the market today. Installation options and cost data will be presented for current and future ship designs and ship sizes.

Paper Delivered by:
Roy-Inge Sørensen
Per Christiansen
(both of Moss Maritime)

Prepared for:
Gastech Abu Dhabi 2006

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: Development of Shipboard Reliquefaction Systems for LNG Carriers (eBook)
Product Code: 4433g121
Published Date: January 2006

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