Audacia  is Allseas’ versatile pipelay vessel, optimised for the execution of small- to large-diameter pipeline projects of any length in all water depths, and for associated work such as the installation of risers and subsea protection frames. The concept for Audacia  was developed entirely in-house and she has been operational since 2007.

A length of 225 m places her between Allseas’ dynamically positioned pipelay vessels Solitaire  and Lorelay. Precise manoeuvring on full dynamic positioning with a stinger positioned on the bow allow Audacia  to work safely in congested areas and lay pipes in very deep water. Pipeline start-ups and lay-downs are executed in very quick time ensuring any disruption to other activities near platforms is minimised. Due to her long length and ship-shape Audacia  can accommodate multiple work stations and has a greater pipe hold capacity. Her independence from anchor handlers and large buffer capacity also ensure she is less dependent on pipe off-loading from supply vessels. A high transit speed, high lay speed and large carrying capacity ensure Audacia  is highly competitive for pipelay projects anywhere in the world.

Technical design

Vessel specifications

Length overall (incl. tilting lift beams and stinger)327 m (1073 ft) 
Length overall (excl. tilting lift beams and stinger)225 m (738 ft) 
Length between perpendiculars217 m (712 ft) 
Breadth32 m (105 ft) 
Depth to main deck19 m (62 ft) 
Operating draught8–11 m (27–36 ft) 
Maximum speed16 knots 
Total installed power39,800 kW 
Thrusters7 x 5000 kW retractable, fixed pitch azimuth thrusters 
Dynamic positioning systemFully redundant, class 3 Kongsberg SDP-11 and SDP-22
HelideckMaximum take-off weight 12.8 t; suitable for Sikorsky S-92 and Bell 429 helicopters 
Deck cranesSpecial purpose crane of 150 t (330 kips) at 16 m (53 ft) main hoist
Pipe transfer crane of 30 t (70 kips) at 33 m (108 ft) main hoist  
Work stationsFiring line with 7 (single joint) welding stations, 1 NDT station and 3 coating stations 
Installed tension capacity3 x 175 t (3 x 390 kips) 
Pipe cargo capacity on main deck14,000 t 
ROV150 HP work-class ROV, rated to 4000 m depth (13,000 ft), for subsea surveys and intervention work 
Pipe diametersFrom 2" to 60" OD 
ClassificationsOU–100 A1–Multi-purpose support unit, pipelaying unit,
OIWS LA, LI, () LMC, DP (AAA), PCR (97, 93) 
Dual A-frameFor PLEM installation and SCR handovers, capacity 550 t (1200 kips)
Buoy handling systemGantry crane above the stinger, capacity 35 t (80 kips), rail length 85 m (280 ft)
Port of registryValletta

Audacia  projects