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FPSOs are a Mature & Versatile FPS Technology

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Turret Mooring Design – Some Challenges and Solutions FPSO Forum 2004 NUS, Singapore Arun Duggal FMC SOFEC Floating Systems www.sofec.com 31 March 2004. FPSOs are a Mature & Versatile FPS Technology. Over 100 units in operation worldwide FPSO total > than all other FPS combined

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slide1

Turret Mooring Design – Some Challenges and SolutionsFPSO Forum 2004NUS, SingaporeArun DuggalFMC SOFEC Floating Systemswww.sofec.com31 March 2004

fpsos are a mature versatile fps technology
FPSOs are a Mature & Versatile FPS Technology
  • Over 100 units in operation worldwide
  • FPSO total > than all other FPS combined
  • Water depth range 20 m to > 1,400 meters
  • 1 to 100+ risers
  • 10,000 bbl – 250,000 bbls/day
  • Up to 2,000,000+ bbls storage
  • Benign (West Africa) to Extreme Environments (North Atlantic)
  • Various flavors:
    • Turret-moored
    • Spread-moored
    • Yoke-moored
    • Hawser-moored
typical permanent internal turret system
Typical Permanent Internal Turret System

Barracuda FPSO: Campos Basin

834m, 34 Risers

Swivel Stack (Product/Lift/Controls)

Manifolds + Pig Launching/Receiving

Anchor Leg + Riser Pull-In Equipment

Bearing (only upper in this case)

Turret Shaft / Riser Guide Tubes

Chain Table (Hawse Pipes/Chain Supports)

6 Anchor Legs + 34 Risers

design considerations

Turret Mooring of

Production Vessels

Design Considerations
  • Vessel Particulars
  • Storage / Tonnage
  • Topsides Layout
  • Vessel Motions
  • Environment
  • Water Depth
  • Waves
  • Wind
  • Current
  • Mooring System
  • Anchor Legs
  • Anchors
  • Risers
  • Thrusters & DP Control
  • Turret Design
  • Configuration
  • Size
  • Location
  • Loads
  • Fluid-Transfer Requirements
  • Well Heads
  • Subsea Manifolding
  • Risers
  • Turret Manifolding
  • Swivels
  • Offloading
  • Pigging
some current turret mooring challenges
Some Current Turret Mooring Challenges
  • More Complex Turret Systems
    • Large number of risers
    • Increased requirements for turret mounted equipment
    • High pressures
  • Riser Systems for very Shallow or Deep Water
  • Project Schedule
    • Short, fast-track schedules
    • Project Design Basis not well defined
    • Interfaces and Communication
  • Installation in Deepwater
    • Installation engineering, equipment, costs
example 1 fast track fpso for shallow water
Example 1: Fast-Track FPSO for Shallow Water
  • Su Tu Den FPSO, Vietnam
  • MODEC, Inc + FMC SOFEC + ConocoPhillips
  • Newbuild FPSO (80,000 bbl oil/day)
  • Schedule: Contact to First Oil – 19 months
    • Turret Delivery Schedule – 12 months
  • Shallow Water (48m water depth)
  • Harsh Environment (100-yr wave of 8.1m Hs)
  • Large Number of Risers (12)
project milestones
Project Milestones
  • 2002 Mar. Contract Award (LOI)(2002/03/21)
  • 2002 Apr. Order Long Lead Items – bearing, forgings, process
  • 2002 Jun. Mooring Design Complete
  • 2002 Aug. Turret Fabrication Begins (MSE)
  • 2002 Oct. Hull Fabrication Begins (Samsung)
  • 2002 Nov. Preliminary Riser Design Complete
  • 2002 Dec. Topside Fabrication Begins
  • 2003 Mar. Drydock – Block Assembly Begins
  • 2003 Apr. Start Topside Module and Turret Installation
  • 2003 May Launching
  • 2003 Jul. Start Shipyard Commissioning
  • 2003 Sep. Tow Out
  • 2003 Oct. Offshore Installation
  • 2003 Oct. 1st Oil (2003/10/29)
std turret mooring design fabrication
STD Turret Mooring Design & Fabrication
  • Use Standard Components & Design
    • SOFEC Large External Turret Design
  • Bearing Capacity exceeds anticipated Design Loads
    • Allows order of main components before final loads derived
  • Design Riser Configuration Flexibility in Chain Table Design/Fabrication
  • Clearly Define all Structural and Fluid transfer Interfaces at Turret Support Structure
  • Parallel Design and Fabrication Effort
  • Easy / Quick Integration with Vessel
slide13

Example 2: Very Large Turret

  • Application
    • FPSO weathervaning SPM
    • Large field (>100,000 bbld)
    • 50 to 100+ risers
    • Deep to ultra deep water
    • Worldwide
  • Weathervaning advantages
    • Mooring tensions
    • Tandem offloading
  • Simplified turret structure
    • Allows for simple interface with vessel
  • Robust bearing system
  • Large Decks for Flowline Manifolding, and other Equipment
  • Efficient Mooring & Riser Installation Equipment
slide14

VLT: Deep Water, Large Capacity Internal Turret

Torque

Arm

Pull-In

Deck

Swivel Stack &

Torque Tube

Piping /

Manifolding

Radial

Bearing

Main Deck

Vertical Bearing

Riser Hang-Off

I-Tubes

Support Columns

Chain Supports

Chain Table

Anchor Legs

Risers & Bend Stiffeners

vlt chain table
VLT Chain Table
  • 3x3 mooring provides 3 riser corridors
  • Riser quantity defines chain table (and turret) diameter
    • 60 risers - 22 m dia
    • 90 risers - 31 m dia
    • 120 risers - 40 m dia
  • 2 riser rows maximum
  • No shadowing to allow inner row installation and replacement
vlt main deck
VLT Main Deck
  • Supports all loads, including:
    • Riser hang-off loads
    • Mooring loads through chain table and support columns
    • Turret self weight
  • Depth-to-diameter ratio is a key design parameter
    • Flexibility to move with vessel
    • Strength to support risers, mooring and turret weight loads
    • 2.5 m depth / 32 m diameter for a 90 riser VLT
conclusions
Conclusions
  • Turret Moored FPSOs are a Very Mature Technology
    • Design for Load Transfer is typically not an issue
    • Current challenges mostly associated with Fluid Transfer
      • Large Number of Risers
      • High Pressure
      • Manifolding
      • Subsea Intervention & Control
  • Project Parameters also Impact Turret Mooring Design
    • Schedule
      • Fast-track: 18 – 22 months
      • Complex systems require more commissioning time
    • Communication & Interfaces – among various contractors / client
    • Knowledge of others scope of work, issues, etc.
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