McDermott International Inc. has delivered the riser support structure (RSS) for the INPEX-operated Ichthys LNG Project’s subsea umbilical, riser, flowline development.
The 7200 t RSS connects the field’s subsea infrastructure to a semi-submersible central processing facility. The RSS structure is comprised of a tower, more than 328 ft tall, with an arch 410 ft long also designed and fabricated by McDermott to be installed at a later date, to support 25 large-diameter flexible risers and dynamic umbilicals.
Tony Duncan, Executive Vice President Subsea, said: “The RSS accounts for more than 25% of the total 28 700 t of subsea structures we are fabricating for Ichthys […] It is an integral piece of the subsea field architecture as all other subsea structures will be installed and oriented relative to its location.”
In addition to the RSS, the facility is undertaking the fabrication of subsea structures including the flow line end terminations, in line tees, manifolds and riser bases.
The Ichthys LNG project was awarded to McDermott in 2012. It includes EPCI and pre-commissioning of product flowline systems, a mono ethylene glycol injection system, start-up condensate transfer and fuel gas transfer flowline systems, control systems and other associated SURF elements in waters up to 900 ft. McDermott will also install mooring systems for the floating production, storage and offtake (FPSO) vessel and central processing facility, as well as engineering for future flowlines, risers and umbilicals.
Adapted from press release by Callum O'Reilly