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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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DeepOcean Group Wins Trenching Job for COOEC in China

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CTC Marine Projects, Ltd., a subsidiary of DeepOcean Group Holding AS, announced the award of a major trenching contract for COOEC on the Liwan 3-1 Project in China located 350 kilometres offshore Shenzhen, China.

CTC will be responsible for the trenching of approximately 174 kilometres of 30-inch pipeline from the Shallow Water Host Platform of the Liwan field development in water depth of 205 metres. For this workscope, CTC will use the MSV Volantis equipped with two ROVs and the world’s most powerful jet trenching ROV, the 2.1 Megawatt UT-1 Trencher.

imageTony Stokes, Director of CTC’s Asia Pacific operations, states, “This project, along with the recently completed project with the Volantis and UT-1 in South Korea, shows the demand for CTC’s trenching technology in the thriving South East Asia region. We look forward to a successful campaign and are very pleased to cooperate with COOEC Subsea on such an epic project.”

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Australia: DeepOcean Wraps Up Kipper Tuna Turrum Trenching

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CTC Marine Projects, Ltd. (“CTC” or the Company), part of DeepOcean Group Holding AS, has announced the completion of its trenching work for the Kipper Tuna Turrum Project in the KTT Field located 45 kilometres offshore Victoria, Australia.

The work was undertaken on contract for McDermott Industries (Aust) Pty Ltd. The Company performed trenching of the recently installed hydraulic and electrical umbilicals located in 100 metres of water.

Prior to going offshore in late December 2011, CTC pre-assembled the A-Frame and CMR3 remotely operated trenching vehicle in Bell Bay, Tasmania, following its transportation from the UK. The trenching spread, which when transported weighed 112 tonnes over 10 units, was then mobilised onboard the client-operated vessel DSV Emerald Sea.

Following the completion of this project, the spread has been demobilised and is ready to commence further work in the APAC region.

“This project was another well planned and executed trenching job by CTC”, says Pierre Boyde, Commercial and Business Development Director. “We currently have another trenching spread, the world’s premier ROV trencher UT-1 on our Volantis subsea construction vessel working in South Korea, and we expect to remain active in this important APAC region.”

Located off the Victorian coast in Bass Strait, ExxonMobil Australia’s Kipper Tuna Turrum Project is currently one of the largest domestic gas developments on the eastern seaboard.

The $4 billion project will develop cleaner-burning natural gas supplies to help secure Victoria’s energy future, and holds enough energy to power a city of a million people for 35 years. Over 3000 people will be involved in the project,  including engineering, project management, and fabrication and offshore construction teams. The Kipper facility construction is expected to be complete in 2012, while Turrum is expected to be completed in 2013.

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