Norway’s Simek A/S last month delivered the Lady Astrid, a Multifunctional Anchor Handling Tug, Supply and Service Vessel to P/R International Offshore Services ANS (IOS), Ålesund, Norway, for deepwater service in the North Sea. IOS is owned 100% by Farstad Shipping ASA.

What’s notable about the Lady Astrid is that it’s a new version of the UT 712 design by the Ship Technology Ulstein unit of Rolls-Royce Marine AS.

This latest UT 712 design is a refinement of the original UT 712 Anchor Handling Tug Supply Vessel, which was built in the mid-eighties (i.e., Far Scout, 1987, Normand Jarl, 1985, Normand Drott, 1984). The UT 712 is well known to North Sea operators for its excellent sea keeping characteristics. The new UT 712 retains this behavior from its predecessor, while at the same time, offering an improved, fuel economical hull form.

Overall length 75.8 m
Beam 17.2 m
Depth to main deck 8.3 m
Draft, summer 6.8 m
Deadweight 2,637 tons
Gross tonnage 2,938
Fuel Oil 1,006 m3
Fresh Water 744 m3
Water Ballast 1397 m3 (incl. Rig chain lockers)
Rig Chain Lockers 404 m3 (incl. in Water Ballast)
Base Oil / Glycol 531 m3
Mud 554 m3
Brine 438 m3
Drill Water (incl. In WB) 1,331 m3
Dry Bulk 231 m3 (8,170 ft3)
Cargo deck 500 m2
Bollard Pull 152.5 tons
Bollard Pull with retractable thrusters 161.5 tons
Speed (trial trip) 17.8 knots

The Lady Astrid is designed and built to undertake supply duties between land base and drilling sites, towing, assist during tanker loading, establishing tow of threatening objects etc. The vessel is specially designed and equipped to accommodate the handling and usage of the specialized equipment employed in deep water anchor handling, i.e. handling of anchors and mooring lines in water depths between 1,500 and 2,000 meters.

Lady Astrid has been built according to the highest class in Det Norske Veritas, with class notation D.n.V. +1A1, Tug, Supply Vessel, EO, SF, DYN POS AUT (IMO DP I), T-MON, CMS, PMS, Dk+, HL(2,8), and according to the Norwegian Maritime Directorate requirement for World Wide trading. The vessel will fly Norwegian flag, registered in the Norwegian Ship register (NOS).

Lady Astrid is the second vessel delivered to IOS from Simek. Its sister, the Lady Caroline, delivered in March 2003, is operating out of Australia.
IOS also bought a secondhand Platform Supply Vessel (PSV), Lady Elizabeth, which was delivered by Simek in 1983. Simek A/S has also delivered four vessels to IOS’s parent Farstad.

The steel units for Lady Astrid were built by Maritim Ltd. in Gdansk, Poland. The units, up to 300 tons each, were transported via barge to Flekkefjord. Before assembly in Simek A/S’ building shed, each unit was blasted and painted. The superstructure, above the main deck, was built in two units, blasted and painted and assembled on a barge and fitted out before it was lifted on the hull after launching January 9.

Of shark jaws and stern rollers
Aft is the steering gear room, which houses Tenfjord steering gears from Roll-Royce Marine AS. These gears connect to two Ulstein High Lift rudders below. The steering gear room also contains the hydraulic pump unit for the capstans.

On the main deck is a set of shark jaws and towing pins, with the hydraulic rams and power unit in the steering gear compartment below. The shark jaw and towing pins, supplied by Karmøy Winch AS, hold back wire and anchor chain when the crew is working with it on the aft deck. At the transom of the vessel is a 6 m long by 3.5 m diameter stern roller, also supplied by Rolls-Royce. The roller can handle a load of 550 tons. On each side of the roller are pop-up towing pins, part of the Karmøy Winch supply, which keep the towing rope from sliding sideways. At the shipside aft is a capstan each side for mooring the vessel and for operating equipment on deck.

Down below and forward of the steering gear room is the aft thruster room with the KaMeWa Ulstein electric driven tunnel thruster of 883 kW (1,200 hp).

Shaft generators of 2,400 kW (3,000 kVA) supply the vessel’s electrical power. Each generator is connected to a Flender twin in, single out gearbox, which together with the four Bergen Diesel C25:33L main engines, were supplied by Rolls-Royce.

The generator set, Caterpillar 3508TA B of 910 kW (1138 kVA), was supplied by Pay & Brinck Motor AS. In the forward part of the engine room are all cooling pumps, coolers and other auxiliary equipment for the engines.

Forward of the engine room on tank top level is the forward thruster room with one Ulstein Aquamaster retractable thruster, type TCNS 73/50-180 and one Kamewa Ulstein side thruster, both of 883 kW (1,200 hp). Both thrusters are driven by fresh water-cooled electric motors and are frequency controlled. The vessel can be laying on stand-by using the retractable thrusters driven by the auxiliary generator only. The thruster rooms have fresh water tanks for domestic use and cargo on each side and forward the forepeak water ballast tank.

The control room, fitted out with the Control Console supplied by the Longva Automation unit of Rolls-Royce Marine AS, together with the UMAS-V alarm, monitoring system for the engines and tank tender system monitoring all cargo tanks and cargo systems onboard.

Forward of the working deck is a waterfall-type towing/anchor handling (AHT) winch, made by Rauma Brattvaag, and supplied by Rolls-Royce, which also supplied two tugger winches on each side of the main deck forward and the windlass/mooring winch on the forecastle deck together with the capstans on aft deck. The tugger winches are used for securing the deck cargo. The AHT winch have one drum for anchor handling and one for towing, both with a capacity of 4,500 m of 80 mm wire, a pull of 380 tons, and brake holding power of 550 tons on first layer. On top of the AHT winch is a secondary winch installed with 138 tons pull and 170 tons dynamic brake capacity.

One gooseneck crane with capacity of 3 tons at 16 m reach is installed on B-deck level port side, supplied by TTS. On port side A-deck is the MOB-Boat, an MP-800 Springer model with water jet, supplied by Maritime Partner AS, and davit supplied by TTS.

The Lady Astrid has accommodations for 24 in 18 cabins. The cabins have light colored panels, Akerpanel, supplied by Norac A/S, and Danacoustic ceilings supplied by Hydro Aluminium. Norac has also supplied the internal doors.

On the bridge deck is the wheelhouse with a size of an average Norwegian home—about 130 m2. The bridge offers 360º visibility, and has two captain’s chairs with steering positions for sailing the vessel.The wheelhouse is fitted out with the latest navigation and communication equipment supplied by Furuno Norge AS, together with Kongsberg Simrad Dynamic Position system DP 1.

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