Tritech Gemini Assists Reef Subsea Dredging and Excavation Operations

Tritech Gemini Assists Reef Subsea Dredging and Excavation Operations
16/10/2013
Industry Sector: Energy

Tritech’s latest product in the Gemini Multibeam range, the Gemini Narrow Beam Imager (NBI), has been proven to provide invaluable data when working in extremely limited visibility conditions.   

The Gemini (NBI) provides operators with real-time high-speed acoustic images from a narrow vertical beam covering a 130° swath. Operating at 620kHz the NBI provides imagery at a 10mm range resolution and with a 0.5° horizontal angular resolution delivers sharp sonar imagery.

A field-proven technology, the Gemini NBI was successfully used by Reef Subsea to monitor the trenched installation of 6-inch and 2-inch cables, while using controlled flow excavation techniques. The seabed conditions around the site varied considerably however even where there was high turbidity Reef was able to clearly monitor the cables using the Gemini NBI.

With the increasing level of cables being laid in shallow water, where turbidity can be at its worst, the Gemini NBI has proven to be highly effective at visualising targets that are typically hidden from view to conventional multibeam sonars.

Robbie Fraser, from Reef Subsea Dredging & Excavation, comments:

“We have been actively looking for the latest high performance sonar to help us track cables and found the Gemini NBI more than capable. Using the Gemini NBI we were able to safely monitor the excavation process and offer our client the assurance required that we were meeting the stated trenching depth. This latest generation multibeam from Tritech has all the traits of Tritech products, proving it to be robust and capable of providing crisp imagery in a very harsh environment allowing my team to view the operation in the murky, dense waters without any downtime.”

Image caption: Tritech's Gemini NBI image of the excavation, showing the clear visibility of the cable being trenched.

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