GAS

Putting the hammer down in Norway

A COMPANY that provides hammer services has been awarded a contract to drive piles to permanently stabilise two subsea structures and initiate three pipelines being installed by Technip in Norway.

Putting the hammer down in Norway

Not only is it a handy earner for Conductor Installation Services, the contract will also be the first to use the CIS subsea piling system.

It also is CIS' first operation in Norway.

The remotely operated subsea piling system lets CIS drive piles as large as 900mm in water depths to 300m.

The contract requires CIS to drive three 750mm initiation anchor piles, four 750mm manifold anchor piles and four 600mm pipeline end manifold anchor piles on the Boyla development.

The job is due to take place in mid-2014.

The CIS subsea piling system features self-tensioning hydraulic winches that lower and raise the hydraulic hoses and electrical cables connected to the hammer.

Conventional systems rely upon technicians to carry out this action by manually operating the winches.

The constant tensioning capability of the CIS system means winches automatically heave and lower, depending on sea conditions.

The entire piling process for Technip in Norway will be carried out by an engineer from a control unit and monitoring system located aboard a vessel.

A hydraulic hammer, connected via an electronic umbilical cable to the control system, will be lowered into the water and placed directly over the subsea pile.

Once it is correctly positioned, the pile will be driven into the seabed by the hammer until it reaches its target depth.

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