Work starts on laying control cable for Ormen LangeProjects and Operations // May 26, 2006
Skandi Neptune has started work on the Ormen Lange project.
The ship's giant carousel.
Norsk Hydro in Norway says work laying of the 125km long control cable for the subsea installations on the Ormen Lange field in the Norwegian Sea has now begun.
The cable will be laid in a single length from the pipeline carousel on board the multi-purpose offshore support vessel Skandi Neptune.
"Since the Ormen Lange field is located in an area where the Storegga submarine landslides took place around 8,000 years ago, this installation represents perhaps the biggest technical laying challenge so far on the Norwegian continental shelf," said Sigmund Lunde, Hydro's project manager for the control cable contract.
"The greatest challenge was to find a route where the control cable can lie safely, between large landslide blocks. Some of these are up to 80-100m long, and 50-60m high. One consequence of this is that the control cable must be laid with an extremely high level of accuracy, typically within 1-2m."
Subsea 7's Skandi Neptune recently started the pull-in to the landfall at the processing plant being built at Nyhamna. The cable is then laid out towards the field, over the Storegga slide area and down to sea depths of 850m, which puts particular demands on both the product and the installation contractor.
After laying, the cable is buried with the help of three Capjet-type excavators designed by Nexans.