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

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

Dec 18, 2023 348 likes •674 views

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

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Positioning Solitaire

From surface to seabed

By Marco Kwanten

Hydrographic Society Benelux Wednesday, 14 October 15

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Allseas fleet

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

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Solitaire is the world’s largest pipelayer

5 Boeing 747-400s

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Solitaire specification

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

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Tasked to lay pipe from A to B

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From beach to fork

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From subsea target box to target box

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Avoiding ‘danger’ areas

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Laying through tiny corridors

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Crossing rock berms

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Lay around pre-installed counteracts

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Displacement initiator

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Buckle initiators

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Lay inside lay corridor

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Requirements

  • Hardware
  • Software
  • Human touch
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GNSS antenna locations Main mast Gantry mast Stinger cantilever

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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)

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GNSS setup

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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 1σ translated to 60°N at 2σ) 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.

Heading

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  • 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

On pipeline heading

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  • 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

I n a curve

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Stinger tip monitoring

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ROV from support vessel

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ROV on board Solitaire

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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

Layback

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Online display

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Helmsman display

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ROV over pre-lay during touchdown monitoring

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Polarled animation

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Questions?