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Helix ESG’s T1200 Trencher Completes First North Sea Oil and Gas Project

Helix Energy Solutions Group’s new T1200 burial and trenching unit is quickly establishing a positive track record following the completion of an oil and gas project in the North Sea. The T1200 features a 1,200hp jet trenching spread, capable of burying product in water depths to 3,000m (10,000ft).

T1200 was deployed to bury a 14km long (8.7 mile), 10 inch export pipeline that included a 3 inch piggyback methanol line. The project specialization called for the line to be buried 2m (6.5ft) deep, with one meter of covering fill. The subsea trenching unit’s water jetting system trenched and simultaneously buried the pipeline under 1.4m (4.5ft) of sand in a continuous run that took just 48 hours.

The successful project is the T1200’s first oil and gas operation, and proves the versatility of the asset which has also been deployed to trench and bury high voltage undersea cables used to transport electricity from offshore wind farms to onshore power stations.

The T1200, operated by Helix ESG’s robotics subsidiary, Canyon Offshore, performed its first trenching job in early July 2012 at the Sheringham Shoal offshore wind farm trenching and burying an approximately 700m (2,300ft) long power cable between the wind turbines. Out of the 80 sections required in the field, the T1200 trenched and buried 37.

The T1200 was built in the UK by Forum Energy Technologies’ Perry Slingsby Systems ROV brand. The T1200’s design was based around the time proven T750 trencher( also owned and operated by Canyon Offshore) but has over 50 percent greater power and the capacity to trench larger diameter products (36 inches) to burial depths of 3m (10ft) depending on soil strength.

Subsea World News – Helix ESG’s T1200 Trencher Completes First North Sea Oil and Gas Project.

Subsea Trenching Beast – A Look At The Helix T1200

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Operated by Canyon Offshore, Helix ESG’s subsea robotics unit, the T1200 will be one of the largest and most powerful ROVs in the world. (Photo: Helix ESG)

By John Konrad On April 5, 2012

Need to cut a 30 foot deep trench in the bottom of the ocean floor to run flowlines out to a new production rig?

No problem.  Helix Energy Solutions’ new T1200 subsea trenching behemoth is just what you’re looking for.image

Looking like a mix between a space ship and an Abrams battle tank, the T1200 is a massive piece of equipment weighing in at over 33 tons (30,000kg) and towering to a height of 12.6ft (3.8m).

While not yet in service, construction of the T1200 trenching and burial unit is one step closer to entering service following testing and installation of its two enormous caterpillar tracks.

The vehicle also got wet for the first time in the manufacturer’s test tank in central England. Still undergoing final fitting, the T1200 is expected to be delivered to Helix ESG this summer and will begin work on board another new asset to Helix ESG’s ROV Support Vessel fleet, the Grand Canyon.

The 1,125hp ROV will use high-powered water jets to cut up to 30 feet into the seafloor and lay power cables, or other tubular products like oil and gas pipelines.

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The Grand Canyon is a new build offshore construction vessel that will host a new T1200 jet trencher, two 200HP XLX ROV systems onboard along with two more ROV systems. The Grand Canyon is 125m x 25m and has a 250t crane, monopool, dynamic positioning systems and helideck. Accommodations are for up to 108 personnel and will be deployed for work in Europe’s growing offshore wind farm projects where her ROVs will conduct power cable trenching and burial operations. (Image: Helix ESG)

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Norway: GMC Yard to Modify AMC Connector

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The AMC Connector, the largest and most advanced cable- and pipe-laying vessel for deep ocean operations has arrived to Stavanger, Norway, to undergo modifications. The vessel will be docked at GMC Yard in Buøy outside Stavanger until March 11th 2012.

The 156-meter long multi-purpose vessel, AMC Connector, is an advanced ship with a high cargo capacity, a variety of special equipment and more than 190 kilometres of cable length. GMC Yard will modify the ballast tanks and building sponsoons under the hull. Work to be carried out includes adding a new auxiliary keel, installing a new stabilising tank and a new VLS tower on the vessel.

“The job is shared between GMC Yard, STX in Florø and the ship owner, Aker Marine Contractors. All already have workers on site for the stay in Buøy, says Operations Manager Kjell Olsen of GMC Yard. A total of 200 people are engaged in modifying the AMC Connector in this period.”

GMC Yard has docking capacity for vessels up to 280 meters, and the AMC Connector has no problem fitting into the large Dock 2 at Buøy. The vessel will be used for laying the power cable from land to the Goliath-field in the Barents Sea.

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