A Way to Prevent Leakages From Cryogenic Bolted Flanges (eBook)

Published Date

January 1996

A Way to Prevent Leakages From Cryogenic Bolted Flanges (eBook)

(Excludes any applicable taxes)

This paper discusses the optimum ways of preventing leakage through bolt tightening (11pp)

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In an LNG plant, be it a liquefaction plant, a receiving terminal or a peak-shaving plant, leakages from bolted flanges must be regarded from various standpoints, economic and safety.

As far as safety is concerned, the issue at stake is key because hazards in an LNG plant are due to losses of LNG. LNG vapors and leakages from flanges are the most frequent cause of such losses. In an LNG plant, one hundred thousand dollars per year can be the order of magnitude of the costs involved. Such a high level is primarily due to the maintenance work involved (insulation, scaffolding). Quite often such costs are not aggregated in a way that enables an actual measurement of them. This is why they can easily be overlooked.

Sophisticated control and safety systems can and do help to reduce hazards. But first, let us find out how to eliminate these leakages. The tightening operation is too often disregarded, mainly through lack of knowledge on the subject. The studies undertaken by Gaz de France and reported hereafter try to improve our understanding of the phenomena which lead to leakages. The ultimate aim is of course the evaluation of the most adequate tightening stress to ensure LNG-tightness.

Paper delivered by:
Jacques Dubost (Gaz de France)
Frédéric Blanc (Gaz de France)

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: A Way to Prevent Leakages From Cryogenic Bolted Flanges (eBook)
Product Code: 4433g030
Published Date: January 1996

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