HEEREMA Marine Contractors has completed installation of the infield production flowlines on the seafloor for the INPEX operated Ichthys LNG project.

Using deepwater construction vessel (DCV) Aegir, Heerema installed 53 kilometres of condensate flowlines using the reeling method.

This involved installation of 14 flowline end terminations (FLETs) and three inline tees (ILTs), as well as onshore prefabrication and spooling onto heavy lift reels at a spooling base in Batam, Indonesia, and the offshore loading of full reels weighing up to 3,185 tonnes.

The DCV Aegir also installed 87 kilometres of 18 inch corrosion-resistant alloy(CRA) production flowlines using the J-lay method, which involved the inline installation of 12 flowline end terminations and six in line tees and onshore prefabrication of about 1,750 18 inch CRAs and 48.8 metres of nominal length quad joints.

All told, 11,000 onshore and offshore highest specification welds were executed and/or supervised by Heerema’s welding technology subsidiary Pipeline Technique Ltd (PTL).

Heerema chief executive Jan Pieter Klaver said the subsea work it had done on the Ichthys project was of a scale unprecedented for the company.

“It involves marshalling, transporting and lowering almost 120,000 tonnes of project materials to the seabed in water depths up to 275 metres in a remote area of the Indian Ocean unprotected against swells and cyclonic summer conditions,” he said.

“Heerema now looks forward to seeing Aegir completing the remaining heavy lift and mooring chain installation work on Ichthys in a similar safe and successful manner.”