support vessel of the year
cylindrical multiproduct tanks in stainless steel, arranged on the centreline of the vessel, are designed for carrying liquids with a flash point of less than 43˚C.
“Groups of tanks can be used for recovered oil, giving the substantial volume of 2,200m3, valuable in an oil spill control situation. Cargo pumps and piping systems are segregated to avoid mixing different products. The use of deep-well pumps in the cargo tanks removes most of the typical common pumps in the pump room.” The deep-well pumps can easily and safely be shifted to handle different products via hatches in the main deck, using the vessel’s cargo rail crane if required. Far Solitaire is innovative in a number of respects, in addition to the cargo tanks and hullform. It will also be the first application of the new Rolls-Royce dual draglink travelling cargo rail crane. “Safety of crew on deck is a priority for Rolls-
Royce and Farstad,” said both companies. “An automatic sea fastening arrangement (ASFA) cargo securing system is specified, giving secure positioning and securing of containers and pipes.” The crane, running on tracks on the starboard cargo rail, can command the whole deck area as well as over the stern. The main advantages of a dual draglink crane are the increased work area and the stable horizontal movement. This wireless-controlled crane may be utilised for various tasks both offshore and alongside in port, easing the work for the deck crew and reducing the risk of accidents. Regarding the advantages of the wave- piercing bow, Rolls-Royce explained that
the
shape of the bow in a wave-piercer means that the upper portion of the hull comes into effect in severe head seas. The hull lines permit the vessel to pierce through the waves, which has several great benefits, proven during model testing. Slamming is to a high degree eliminated and pitching is reduced. The result is more comfort for the crew, with the benefit of better rest and
Far Solitaire will be able to transport up to 1,600m3 of chemicals to and from a platform
safer work. Due to more steady speed under any weather condition, fuel consumption is reduced and propulsion machinery is variable load.
less exposed to
The full beneficial effect of a bulbous bow is gained in a hullform that is easily driven, despite its wide beam and large cargo carrying capacity, giving low fuel consumption over a range of transit speeds. All Rolls-Royce Marine WP vessels will automatically be designed to meet Clean Design requirements. Propulsion on the innovative new vessel is by two controllable pitch, variable speed Azipull main thrusters with pulling propellers, a solution which has found wide acceptance for PSVs. The beam of the UT 754 WP allows the electric motors for the propulsors to be installed athwart ships, freeing more space lengthwise for cargo tanks. Each Azipull 120 CP thruster can be supplied with up to 2,500kW. The main thrusters are supplemented by two super silent tunnel-type bow thrusters, each of 883kW, and a swing-up azimuthing bow thruster also rated at 883kW, all of which have controllable pitch and variable speed.
All the propulsion machinery can be controlled by the DP2 dynamic positioning system. Power is
provided by three Bergen 25:33L9A generator sets each developing 2,765 kilowatts electrical (kWe) with selective catalytic reduction. The adoption of selective catalytic converters is in keeping with the vessel’s environmentally friendly design, the NOx reduction system being supplied by H+H Umwelt- und Industrietechnik in Germany. This type of system is based on the reaction between
NOx and urea-based ammonia (NH3) in the flue gas on the surface of a catalyst. The process reduces
NOx to nitrogen (N2) and water vapour. The space available to fit a selective catalytic converter and provide storage of urea on board is limited on many vessels, not least PSVs, so the system needs to be of compact design. In addition there is a high speed 625 kWe harbour generator and a separate emergency genset. The propulsion system has multiple redundancy, giving an ERN number of 99.99.99.99 in DP operations.
Sverre Farstad, chairman of the company, and Børge Nakken, VP-technology & development, are joined by the designer and builder of the vessel when collecting their award
22 I Annual Offshore Support Journal Conference and Awards 2013
Three main engines in combination with diesel- electric propulsion, main electric switchboard split in three sections and three separate thrusters forward has several advantages, such as transit at economic speed with one engine efficiently running at the time; utilising optimal specific fuel consumption; and efficient operation of catalytic converters. Another benefit is redundancy during DP operation. When in port, Far Solitaire will be able to accept any voltage or frequency and use the shore supply either alone or in parallel with any of the vessel’s own generators. This opens the way to use renewable energy sources, while total energy use is also reduced by using LED deck lighting equipment. Metizoft in Norway provided the Green Passport and inventory of hazardous materials for the environmentally friendly vessel. Accommodation is provided for a total of 25 people meeting Comfort V(3) class requirements. A curved plan for the forward and aft wheelhouse windows offers excellent visibility from the transit and aft control stations. Farstad reports that this innovative design is being well received by clients such as oil companies. OSJ
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