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Offshore Support Journal

Offshore Support Journal

Royal IHC details design of Subsea 7 reel-lay vessel

Tue 03 Oct 2017 by David Foxwell

Royal IHC details design of Subsea 7 reel-lay vessel
Royal IHC says Subsea 7’s new unit will be more technically advanced than older reel-lay vessels

Royal IHC has signed a contract with Subsea 7 to design and build an innovative reel-lay vessel. The vessel will be capable of installing complex rigid flowlines including pipe-in-pipe systems.

The shipbuilder said that, in close co-operation with Subsea 7, IHC has incorporated several innovative features to make this “the most technologically advanced vessel to date.” Delivery of the vessel is planned for early 2020.

Royal IHC chief executive, Dave Vander Heyde said “Based on the ratio between top pipe tension and payload to displacement, this will be one of the most cost effective vessels to enter the market.”

The vessel’s compact dimensions are facilitated by the positioning of its three enginerooms and main reel, efficient use of the superstructure, and low-profile pipelay ramp. The smart use of space opens a large aft working deck, while the optimised mass distribution minimises the ballast water requirement.

With model tank testing already having been performed, Subsea 7 can be confident that it will receive a vessel from IHC that excels in performance, both in transit and in DP conditions, and provides maximum comfort for the crew.

The design of the reel lay system focuses on operational efficiency and flexibility, alongside crew safety. The twin tensioner pipelay ramp tilts to allow pipeline installation from shallow waters to depths of up to 3,000 m.

The large multi-level workstation optimises the efficiency of operations in and around the firing line, while a fixed auxiliary reel, recessed into the main deck, gives payload flexibility.

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