The All Metal LNG Offloading System for the Adriatic LNG Terminal (eBook)

Published Date

January 2006

The All Metal LNG Offloading System for the Adriatic LNG Terminal (eBook)

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This paper discusses the design aspects of the offshore Chiksan LNG Loading Arms for the Adriatic LNG Terminal. (19pp)

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The operating envelope of LNG loading arms can easily exceed 20m height and 30m reach, experience and testing has shown that the connection of a manually operated QC/DC (Quick Connect/Disconnect Coupler) cannot be safely carried out when dynamic motions in any direction exceed ~0.1m at wave induced motion frequencies.

For arms equipped with hydraulically operated QC/DC's, the range is slightly higher such that manifold connection in peak motions of up to only 0.5m can be accommodated, depending on the associated velocities and accelerations.

These dynamic motion limitations have historically penalized the feasibility of side-by-side cargo transfer operations in exposed or offshore locations. Such would have been the case for a new offshore Gravity Based Structure (GBS) LNG terminal in the Adriatic, if not for the application of a new connection system developed by FMC for LNG loading arms.

To meet the requirements for LNG offloading at the new offshore GBS terminal in Italy the partners will install all metal FMC marine loading arms that are specially designed to meet the operating requirements for LNG carriers exposed to the local wave conditions. Because of the offshore location of the terminal, the Project and FMC carried out an extensive design and qualification phase of the specially equipped Chiksan LNG Loading Arms in order to meet the demanding safety and operability criteria required for the transfer system. The development and qualification work commenced in 2003 and was carried out through the pre-FEED and FEED project phases such that the loading arm design features were well advanced by the start of EPC. Fabrication of the arms is complete and they will be mounted to support platforms on the GBS in 2007 at the location where the GBS is being constructed in Spain. In 2008, the GBS with installed arms will be towed to the terminal's final location in the Adriatic Sea.

This paper discusses the design aspects of the offshore Chiksan LNG Loading Arms for the Adriatic LNG Terminal and explains work ExxonMobil and FMC jointly conducted as part of their qualification for this demanding application. Focus is primarily placed on the unique features that are incorporated in the design, including the cable targeting system, constant motion swivel joints, and quick connect/disconnect coupler (QC/DC). Unique aspects of arm operation, structural design and the Failure Modes Effects Criticality Analysis (FMECA) are also covered.

Paper Delivered by:
Charles Hughes (ExxonMobil)
Renaud Le Devehat (FMC Technologies SA)

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: The All Metal LNG Offloading System for the Adriatic LNG Terminal (eBook)
Product Code: 4433g115
Published Date: January 2006

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