Evacuated Insulating Boxes Giving Low Boil-Off for Gaz-Transport Methane Carriers (eBook)

Published Date

January 1986

Evacuated Insulating Boxes Giving Low Boil-Off for Gaz-Transport Methane Carriers (eBook)

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This paper describes a study that shows that maintaining the insulation space of a Gaz-Transport type methane carrier at low absolute pressure would permit significant reductions in the boil-off rate. (6pp)

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The transportation of natural gas in liquid form is a relatively recent technique. Indeed, the studies and research efforts leading to the construction of the first French methane tanker, the Jules Verne, fitted with self-supporting cylindrical tanks, having a total capacity of 25,000 m3, date back only to 1958.

It was not until the late 1960s that two French firms,Technigaz and Gaz-Transport, developed a new design called the integrated tank or membrane system. Technigaz uses stainless steel for the construction of its membrane, and balsa wood for the thermal insulation. Gaz-Transport has chosen the cryogenic alloy Invar for the construction of its double membrane tanks, and marine plywood boxes filled with perlite for the wall insulation. This process was adopted first in 1968 for the construction of two 71,500 m3 methane carriers, the Polar Alaska and the Arctic Tokyo. Since then, 32 large capacity ships using the Gaz-Transport process have been ordered. This represents nearly 40% of the world's fleet of LNG transporters.

If the number of carriers using the Technigaz system is added to this figure, one finds that nearly 56% of all the LNG carriers built so far rely on the membrane technique developed and perfected by French companies. This original technique continues to be the subject of considerable research and development activity, aiming at its optimisation.

Paper Delivered by:
E Flesch (Gaz de France)
R Lootvoet (Gaz-Transport)

Prepared for:
Gastech Hamburg 1986

Title: Evacuated Insulating Boxes Giving Low Boil-Off for Gaz-Transport Methane Carriers (eBook)
Product Code: 4433g135
Published Date: January 1986

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