Positioning Solitaire From surface to seabed By Marco Kwanten - PowerPoint PPT Presentation

Positioning Solitaire From surface to seabed By Marco Kwanten Hydrographic Society Benelux Wednesday, 14 October 15

Allseas fleet Solitaire Audacia Lorelay Solitaire Audacia Lorelay Tog Mor Tog Mor Calamity Jane Pioneering Spirit Calamity Jane

Solitaire is the world’s largest pipelayer 5 Boeing 747-400s

Solitaire specification 397 m (1302 ft) Length (incl. stinger) : Length (excl. stinger) : 300 m (984 ft) (135 ft) Breadth : 41 m (459 ft) Stinger length : 140 m 120 m (394 ft) Minimum radius : Installed power : 51,500 kW (69,063 hp) Maximum speed : 13.5 knots (2315 kips) Tension capacity : 1050 t 2” to 60’’ Pipe diameters : Pipe storage : 22,000 t (661 kips) Multi-purpose crane : 300 t Accommodation : 420 persons

Tasked to lay pipe from A to B

From beach to fork

From subsea target box to target box

Avoiding ‘danger’ areas

Laying through tiny corridors

Crossing rock berms

Lay around pre-installed counteracts

Displacement initiator

Buckle initiators

Lay inside lay corridor

Requirements • Hardware • Software • Human touch

GNSS antenna locations Stinger cantilever Main mast Gantry mast

Main mast and gantry mast Two sets of 2x GNSS receivers with: • 2x L-band corrections (each) • 1x GNSS antenna (each) • Input from one of the 2 Inmarsat domes • QC computer • NTRIP corrections (Network Transport of RTCM data over IP)

GNSS setup

Heading During unguided lay, heading is very important. With a layback of 600 m in shallow waters, 0.4° heading difference (Octans precision of 0.1° seclat at 1 σ translated to 60°N at 2 σ ) amounts to a 4.2 m difference on the seabed. In deeper waters the layback may increase to several kilometres, but next to heading, the current starts playing a role. Corridors are usually wider in deeper waters.

On pipeline heading PPP heading shows 0.1° difference, roll induced as • height difference between antennas is 15 m LD7 heading is noisier that Octans heading • PPP heading is noisier than LD7 heading • Octans units do not seem to drift >0.05° from LD7 •

I n a curve PPP heading shows -0.2° difference, roll induced as • height difference between antennas is 15 m LD7 heading is noisier that Octans heading • PPP heading is noisier than LD7 • All 3 Octans units have different drift, but well • within their specs within this period

Stinger tip monitoring

ROV from support vessel

ROV on board Solitaire

Layback Layback is calculated from the bead stall to touchdown and is dependent on lay vessel tension: • Pipe parameters (wall thickness, coating, steel grade etc.) • Stinger settings (radius, departure angle) • Client/DNV criteria • Depth • Dynamics (shifting TD point) Varies from ~400 m to 3500 m

Online display

Helmsman display

ROV over pre-lay during touchdown monitoring

Polarled animation

Questions?