Mark III Containment System Pre-outfitting on Blocks - a New Method for LNG Carrier Construction(eBook)

Published Date

January 1993

Mark III Containment System Pre-outfitting on Blocks - a New Method for LNG Carrier Construction(eBook)

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This paper describes an investigation into membrane construction within tanks undertaken by Chantier and NKK, and the new method developed as a result. (10pp)

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When one considers the construction sequences of a LNG carrier, the important task concerns the containment system. In the case of membrane type LNG carriers, the erection of this containment system involves activities that are not directly derived from the traditional activities of a shipyard and it involves methods that may not appear as rationalized as might be expected.

Today the ship hull is built from large blocks fully prefabricated. The weight of these blocks may be as high as 600 ? and the blocks may incorporate piping and some equipment. At the stage of the erection of the containment system, the method is different and it is undertaken when all the hull is fully completed and the ships are afloat. This requires complete scaffolding to be installed in each tank, which enables to work in different parts of the tank at the same time. Such a set of scaffolding for one ship means a large investment. The fact that the containment system is installed inside the tank means also that some working positions are not the best ones: for example fitting the containment system on the ceiling of the tank and on the upper chamfers.

With these considerations, it would be worthwhile for a shipyard to investigate other methods for the erection of the containment system, provided that such a containment system allows modification of the erection sequences. This statement has been made by two shipyards, considering the MARK III Containment System, almost at the same period:
- Chantiers de l'Atlantique which has built in the past several ships with MARK I containment system and which is considering MARK III system as a proper solution for present LNG carriers projects
- NKK which has now under construction a LNG carrier, 18,800 cu.m capacity, with the MARK III system and which can therefore evaluate the benefits expected from another method of erection.

The two shipyards have therefore decided to investigate potential new erection methods. Technigaz has brought its expertise in MARK III Containment System to the two shipyards. The results which are introduced now are the conclusions which are common to the two studies performed by the shipyards and Technigaz. This new erection method will now be introduced. It has been named: Preoutfitting on blocks.

Paper Delivered by:
R Courtay (Chantiers de l'Atlantique)
M Kawashima (NKK)
J Claude (Technigaz)

Prepared for:
Gastech Paris 1993

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: Mark III Containment System Pre-outfitting on Blocks - a New Method for LNG Carrier Construction(eBook)
Product Code: 4433g017
Published Date: January 1993

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