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Subsea installation project to take place in the Bass Strait, Australia

Published by , Editorial Assistant
Oilfield Technology,

Maritime Developments Ltd (MDL) has supported DOF on a flexible installation project in Bass Strait, Australia.

The package of support covered provision of mission enabling equipment and experienced field service personnel, together with tailored Project management and engineering services.

These covered the complete mobilisation of two MDL spreads on board the Skandi Acergy in Peterhead, including sea fastening on-site welding, as well as manufacture of an inclined grillage for the tensioner, carousel loading chute, HLS grillage, two flying lead deployment frames and hang-off collars.

The first spread consisted of a Generation 2 Reel Drive System, deck deflectors in a 200o formation and 6 t 2-track tensioner on the bespoke grillage. It was used for the transpooling of umbilicals and flowlines from a total of 10 Coflexip reels between 8.6 m and 10.6 m diameter onto the under-deck carousel.

The benefit of using an MDL RDS for this scope was the automation of the hub drive which did not require manual repositioning or additional packers in order to stroke between the different diameter reels.

The operations were carried out in Hartlepool and Newcastle, UK, here the RDS and 2-track tensioner were demobilised, for return to Peterhead by road transport.

The vessel then transited to Western Australia to perform the installation from the under-deck carousel, using an MDL Horizontal Lay System with a 51 t 4-track tensioner and a bespoke tulip centraliser assembly for optimal product deployment. The spread was operated by MDL’s expert field service personnel.

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