Fortitude

Fortitude  is a multipurpose offshore construction vessel (OCV) acquired by Allseas in 2018. The vessel is designed for worldwide operations in the oil and gas sector, ultra-deepwater installation and construction, and pipelay and heavy lift support. Optimised for the installation of flexibles, umbilicals, manifolds, jumpers and other subsea production system components, Fortitude  is fitted with two high-capacity active heave compensated offshore cranes (900 t and 200 t respectively) and moon pools for all-weather ROV operations.

The state-of-the-art DP3 vessel is 150 m long and 32 m wide, with a free deck area of 2900 m² and accommodation for up to 250 persons. The large deck area provides clear space to accommodate a 550-t flex lay tower over the main 8.4 m x 8.4 m moon pool. The vessels boasts an enclosed ROV hangar for the deployment of two large work class deep-water ROVs, over-the-side Launch and Recovery Systems and Tether Management Systems depth rated to 4000 m (13,100 ft).

Technical design

Vessel specifications

Length overall151 m (495 ft) 
Length between perpendiculars144 m (351 ft) 
Breadth32 m (105 ft) 
Depth to main deck13 m (44 ft) 
Operating draught10 m (32 ft) 
Maximum speed13.9 knots 
Total installed power22,380 kW 
ThrustersMain azimuth thrusters (stern): 3 x 3350 kW (peak) Schottel SRP 4040 LSU non-retractable azimuth thrusters with fixed-pitch propellers 
Dynamic positioning systemLR DP (AAA), dual redundant Kongsberg K-Pos DP-22/12 system 
Accomodation250 persons  
HelideckMaximum take-off weight 15.6 t; suitable for Sikorsky S-92 helicopters 
Deck cranesOffshore luffing jib crane (AHC), 900 t (2000 kips) at 17 m (56 ft)
Knuckle boom crane (AHC), 200 t (440 kips) at 10 m (33 ft)
 
ROV150HP Schilling Robotics UHDI work class ROV with TMS, depth rating 4000 m (13,100 ft), Seaeye Cougar XT observation class ROV with TMS, depth rating 2000 m (6560 ft), Rolls-Royce (AHC) over the side LARS, with 3000 m (9845 ft) umbilical, Hydramec (AHC) over the side LARS, with 2000 m (6560 ft) umbilical 
Clear deck space2900 m² 
ClassificationsLR 100A1 Offshore Supply Vessel, Firefighting ship type 2 (7200 m³/h), Helideck, *IWS, WDL+, ECO(TOC), Ice class 1C FS at a draught of 9.8 m (max/min draughts: Fwd: 9.98/6.74 m; Aft. 9.83/6.75 m); power required 4959 kW, power installed 10,050 kW
LMC, UMS, DP(AAA), ShipRight SRtP
 
Bow thrusters2 x 3350 kW Wärtsilä retractable azimuth thrusters, 2 x 2500 kW Wärtsilä tunnel thrusters
Stern thrusters3 x 3350 kW Schottel azimuth thrusters
Moon poolMain moon pool (8.4 m x 8.4 m)
Port of registryValletta, Malta

Fortitude  projects