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Sonardyne provides acoustics for pipelay vessel

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World Pipelines,

Sonardyne Inc. has announced that it supplied acoustically aided inertial navigation technology to offshore engineering, procurement, construction and installation company, McDermott International, Inc., for its Lay Vessel 108 (LV 108).

Sonardyne’s Ranger 2 Pro DP-INS system is being used by McDermott to support touchdown monitoring surveys of submarine cables, umbilicals and pipelines and as an independent position reference for the LV 108’s Kongsberg dynamic positioning (DP) system.

The LV 108 entered service in 2015 and is currently on contract in the Ichthys field in Western Australia. Designed as a fast transit, dynamically positioned vessel for subsea constructions support, the LV 108 has 21 528 sq ft of deck space and can accommodate a crew of 129.

Dynamically positioned construction and installation vessels, such as the LV 108, ordinarily rely on ultra short baseline acoustics and global navigation satellite systems as their primary sources of position reference data. However, a vessel’s station keeping capability can be compromised if an ultra short baseline is affected by thruster aeration, meaning that the global navigation satellite system signal is simultaneously interrupted. The latter is particularly common around equatorial regions and during periods of high solar radiation.

Sonardyne’s Ranger 2 Pro DP-INS system addresses this operational vulnerability. It aids vessel positioning by exploiting the long term accuracy of Sonardyne’s Wideband 2 acoustic signal technology with high integrity, high update rate inertial measurements. The resulting navigation output has the ability to ride through short term acoustic disruptions and is completely independent from global navigation satellite system.

The equipment supplied to McDermott included Sonardyne’s INS sensor co-located with the company’s sixth generation HPT acoustic transceiver. This hardware was installed on one of the vessel’s two Kongsberg through-hull deployment machines and interfaced directly with the vessel’s DP system.

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