McDermott completes milestone riser support structure for Ichthys project

Offshore staff

HOUSTON McDermott International Inc. (NYSE:MDR) has delivered the riser support structure (RSS) for the INPEX-operated Ichthys LNG project’s subsea umbilical, riser, flowline development.

The 7,200-ton (6,532-metric-ton) RSS connects the field’s subsea infrastructure to a semisubmersible central processing facility. The RSS comprises a tower, more than 328 ft (100 m) tall, with a 410-ft-long (125-m-long) arch, also designed and fabricated by McDermott to be installed at a later date, to support 25 large-diameter flexible risers and dynamic umbilicals.

The RSS accounts for more than 25% of the total 28,700 tons (26,037 metric tons) of subsea structures that McDermott is fabricating for Ichthys. The RSS 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, McDermott is undertaking the fabrication of subsea structures, including the flowline end terminations, inline tees, manifolds, and riser bases.


The Ichthys RSS accounts for more than 25% of the total subsea structures that McDermott is fabricating for the Ichthys project. Photo courtesy of Business Wire.

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