The 130-metre long and 25-metre wide ‘Polar Onyx’ is based on ULSTEIN’s SX121 design, a design which is generally designed to operate in the IMR/SURF construction market, with high capacity for flexible pipe cargo below deck and on main deck.
Irene W. Basili, CEO GC Rieber Shipping, states: “The new addition to the company is a vessel with high technical and operational capacity which will strengthen our position in the high-end subsea segment. The vessel is designed to meet the increasing expectations from our clients in this segment in terms of operational redundancy and flexibility. Our cooperation with Ulstein Verft has been excellent, which again has been essential for us in supporting our client.”
‘Polar Onyx’ can accommodate 130 persons, and complies with the latest international environmental standards. She is certified according to Special Purpose Ships (SPS) and Clean Design and carries a Green Passport. ‘Polar Onyx’ has a large construction/cargo deck area of 1,700 m2. She is equipped with an AHC offshore crane capable of lifting 250 tonnes at 14-metre outreach, and a 12-tonne AHC offshore crane. She will also carry two new work class ROVs, one to be deployed through a moon pool, the other over the starboard side.
The vessel is classed according to DNV, and meets the highest standards for station keeping, redundancy and dynamic positioning (DP3), with additional redundancy on all major components on board. Moreover, operability in DP2 operational mode is maximised due to the ‘Operation+’ feature, allowing the vessel to continue and retain system integrity with uninterrupted operations even after a substantial single system failure.
‘Polar Onyx’ is powered by a diesel electric plant comprising of six identical 2,740 ekW generator sets. Due to three thrusters forward and three azimuth main thrusters aft, the vessel is kept on a steady course also during pipe laying operations.
QUALITY AND EXPERTISE
Gunvor Ulstein, CEO Ulstein Group, comments: “ULSTEIN has a complete cycle of expertise in ship design, engineering, shipbuilding and ship investments, specialising in high-quality, advanced offshore vessels for demanding operations world-wide. We have had an excellent cooperation with GC Rieber Shipping in the development and construction process, and we wish the shipowner and contractors all success with the ‘Polar Onyx’.”
Ceona has chartered the vessel for a fixed period of five years, with options for up to five more years. After delivery, additional topside equipment will be installed before ‘Polar Onyx’ enters operations from May 2014.
Steve Preston, CEO at Ceona, said: "We are delighted with the on-time delivery of the ‘Polar Onyx’. After installation of a new 275 tonnes vertical laying tower in the Netherlands, she will be immediately used at her full potential in Brazil to deliver safely and efficiently deepwater SURF services to Petrobras through our partnership with Odebrecht.”
Overall length: 130 m
Breadth: 25 m
Trial speed: 15.1 knots
Deadweight without VLS tower: approx. 8,200 t
Deck area aft of hangar: 1,700 m2
ULSTEIN X-BOW® hull line design
250 tonne AHC offshore crane
ROV moon pool: 4.9 x 4.9 m
VLS moon pool: 8 x 8 m
SURF: subsea umbilicals, risers and flowlines
IMR: Inspection, maintenance and repair
DP3: Corresponding to DNV’s class notation DYNPOS-AUTRO. DP3 includes separated fire and flooding zones (which is not included in the DP2 standard). Loss of position should not occur from any single major failure.
Operation+/DP2 operations: In compliance with the Operation+ design philosophy, the switchboard system, propellers and diesel motors can be configured in groups of two, three or four, by Master’s choice. In case of a DP2 (DNV’s notation AUTR) operation, i.e. the occurrence of a single major failure, the vessel will only lose one third of its installed power package and propulsion, and will be able to complete the operation with two thirds of its capacity.
Redundancy: The duplication of critical components or functions of a system with the intention of increasing reliability of the system.
ROV: ROV = Remotely operated vehicle: An underwater robot linked to the vessel by an umbilical cable, which can observe and send data, film, photos and signals from the sea bed. A work class ROV can also perform simple work on sea bed installations.
AHC: Active heave compensated: By the use of hydraulics, heave compensators reduce the effect of vertical ship heave, with the result that the vessel does not require completely calm seas to perform construction work
Moon pool: A vertical passage from working deck down through the vessel giving access to the water below. Through the vertical tunnel opening structures, modules, tools and instruments can be lifted and lowered into the sea.