LNG/LPG Arms Protection Against Excessive Ship Movement. A New Approach (eBook)

Published Date

January 2000

LNG/LPG Arms Protection Against Excessive Ship Movement. A New Approach (eBook)

(Excludes any applicable taxes)

This paper describes analysis carried out as an extension to the recent OCIMF edition of Marine Loading Arms, using new information and parameters. (29pp)

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The new OCIMF Design and Construction Specification for MARINE LOADING ARMS (Third Edition – 1999) departs significantly from previous editions with regard to ESD and ERS alarms setting. In particular it does not specify any longer figures for ESD and ERS sequences duration and for drifting distances /speeds to be used for first stage and second stage alarms setting on loading arms.

This issue of alarms setting was raised by our Company to the OCIMF loading arms Task Force as early as 1997 after considerable work and experience have been gained on the subject at various LNG/LPG terminals characterized by very different weather conditions and ships dimensions (like Indonesia, Yemen, India, etc.).

We found that the traditional way of alarms setting based on the consideration of three parameters fixed arbitrarily and taken independently from each others was not reflecting the reality and could lead either to unnecessary arms envelope wastage or to underestimated drifting speeds and distances. Furthermore no account has been taken until now for a catastrophic scenario like ship breakout.

A global approach incorporating the accurate estimation of these parameters and examining how they interact was therefore necessary and has been successfully carried out. This paper summarises the work done on the subject by our Company and gives a practical example resulting from a recent LNG jetty project.

Paper Delivered by:
Bertrand Lanquetin (TOTALFINAELF)

Prepared for:
Gastech Houston 2000

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: LNG/LPG Arms Protection Against Excessive Ship Movement. A New Approach (eBook)
Product Code: 4433G095
Published Date: January 2000

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