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LECC 2011
FLEXIBLE RISERS
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Risers
Seabed to surface
Gas, oil, water
Production, Injection, Export
Floating platforms need flexible risers
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FPSO
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FPF
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Pliant wave
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Parameters (typical)
Design life 20 years
Length 800 metres +
Internal Diameter 6 to 16 inches
Operating pressure up to 350 bar (80%)
Operating temperature up to 100C
Water depths up to 1000m (70%)
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Structure
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Structure
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Manufacture
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Principal Manufacturers
Technip
Wellstream
NKT
Some 1400 km of flexible pipe
manufactured, of which 58% are risers
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Failures
Recent survey
1400 static lines
1900 risers
315 reported damage/failure incidents
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Failure modes include:
Sheath damage / Flooded annulus
Ageing of Pressure Sheath
End fitting pull-out Vent system malfunction
Carcass collapse
Overbending Abrasive wear
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Puncture
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Internal collapse
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Carcass collapse
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Abrasion
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Sheath burst
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Robert Boyle 1627 - 1691
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Condition monitoring
Visual observation (ROV)
Annulus vacuum/pressure testing Gas sampling
Coupon testing
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Repair / Replacement
Timescale
Inspection of damaged riser
Cost of manufacture Cost of changeout
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Future Focus
Water depth limit?
Operating pressures up to 1300 bar(?)
Operating temperatures New monitoring techniques
Annulus vent system design
Reassessment of corrosion fatigue Investigation of new failure modes
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LECC 2011
CONTROL UMBILICALS
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Subsea installations
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Template
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Control functions
Control/monitoring from surface
installation (or shore)
Static and/or dynamic
Valve operations
Downhole monitoring
MEG injection
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Structure
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Record breaker?
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Control from platform
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Subsea Control Module
C f f
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Control from floating installation
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Failure modes
Damage during manufacture UTH damage / jumper cables
Leakage in hydraulic lines
Contamination of hydraulic oil Installation damage including ploughing
Water ingress to electrical components
Loss of insulation resistance (Cables)
Interface with surface installation
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Future Focus
Increasing water depth
Increasing complexity of subsea
developments
Fault tracing
Advanced repair methods
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Charles Taylor adjusting
INTERNATIONAL LOSS ADJUSTERSPresented by Martin Oinn
Charles Taylor energy
88 Leadenhall Street
London EC3A 3BA
Telephone - +44 (0) 20 7623 1819
Facsimile - +44 (0) 20 7623 1817
Direct Dial - +44 (0) 20 7015 2018