OMAE 2011-50298 Presentation
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OMAE2011-50298
Murphy Thunder Hawk:New Findings on Polyester and
Chain Mooring SystemsPresented by
Jonathon D. Miller P.E.
OMAE2011-50298
Murphy Thunder Hawk:New Findings on Polyester and
Chain Mooring SystemsPresented by
Jonathon D. Miller P.E.
![Page 2: OMAE 2011-50298 Presentation](https://reader036.fdocuments.us/reader036/viewer/2022062319/556ab3fcd8b42a89038b4cb8/html5/thumbnails/2.jpg)
OverviewOverviewOverview
• Thunder Hawk Platform• Inspection Findings• Conditions for Corrosion• Steel Corrosion Model• Bio-film formation• Rusticles – Composition• Rusticles – Structure• Rusticles – Other vessels• Conclusions • Acknowledgements
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Thunder Hawk PlatformThunder HawkThunder Hawk PlatformPlatform
• 45,000 BOPD Oil• 70,000,000 CFPD Gas• 71 x 71 x 52 m hull• 10,250 tons operating wt• Murphy (37.5%) • ENI (25%)• StatOilHydro (25%)• Marubeni Oil (12.5%)
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Thunder Hawk PlatformThunder Hawk Thunder Hawk PlatformPlatform
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Thunder Hawk PlatformThunder Hawk Thunder Hawk PlatformPlatform
• Insert Drawing of Mooring Leg
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Thunder Hawk PlatformThunder Hawk Thunder Hawk PlatformPlatform
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Thunder Hawk PlatformThunder Hawk Thunder Hawk PlatformPlatform
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Thunder Hawk PlatformThunder Hawk Thunder Hawk PlatformPlatform
~2m
~2.5m
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Thunder Hawk PlatformThunder Hawk Thunder Hawk PlatformPlatform
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Inspection FindingsInspection FindingsInspection Findings
• Top Chains – Twist Free• Fairleads – Intact• Fairlead Chains – Intact• Polyester Ropes – Intact• H-link hardware – Intact• Ground Chain – Intact • Ball-grab connectors – Not visible• Anchors – Intact
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Year 1 Inspection-Mooring LinesYear 1 InspectionYear 1 Inspection--Mooring LinesMooring Lines
• Topside Chains +15m
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Year 1 Inspection-Mooring LinesYear 1 InspectionYear 1 Inspection--Mooring LinesMooring Lines
• Fairlead Chains – 26m
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Year 1 Inspection-Mooring LinesYear 1 InspectionYear 1 Inspection--Mooring LinesMooring Lines
• Upper Chain to Polyester H-Link – 117m
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Year 1 Inspection-Mooring LinesYear 1 InspectionYear 1 Inspection--Mooring LinesMooring Lines
• Polyester Insert – 142m
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Year 1 Inspection-Mooring LinesYear 1 InspectionYear 1 Inspection--Mooring LinesMooring Lines
• Upper Polyester to Polyester H-Link – 144m
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Year 1 Inspection-Mooring LinesYear 1 InspectionYear 1 Inspection--Mooring LinesMooring Lines
• Lower Polyester to Polyester H-Link – 147m
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Year 1 Inspection-Mooring LinesYear 1 InspectionYear 1 Inspection--Mooring LinesMooring Lines
• Upper Polyester Segment – 700m
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Year 1 Inspection-Mooring LinesYear 1 InspectionYear 1 Inspection--Mooring LinesMooring Lines
• Middle Polyester to Polyester H-Link – 960m
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Year 1 Inspection-Mooring LinesYear 1 InspectionYear 1 Inspection--Mooring LinesMooring Lines
• Lower Polyester Segment – 1462m
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Year 1 Inspection-Mooring LinesYear 1 InspectionYear 1 Inspection--Mooring LinesMooring Lines
• Lower Polyester to Chain H-link – 1717m
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Year 1 Inspection-Mooring LinesYear 1 InspectionYear 1 Inspection--Mooring LinesMooring Lines
• Lower Chain Segment – 1751m
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Year 1 Inspection-Mooring LinesYear 1 InspectionYear 1 Inspection--Mooring LinesMooring Lines
• Driven Piles – 1870m
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Year 1 Inspection-Mooring LinesYear 1 InspectionYear 1 Inspection--Mooring LinesMooring Lines
• Marine Life Highlights
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The Subsea Environment – ReinhartThe Subsea Environment The Subsea Environment –– ReinhartReinhart
Surface
300
600
900
1200
1500
1800
2100
6.4 6.6 6.8 7.0 7.2 7.4 7.6 7.8 8.0 8.2
33.0 33.2 33.4 33.6 33.8 34.0 34.2 34.4 34.6 34.8
0 1 2 3 4 5 6
0 2 4 6 8 10 12 14 16 18
pH
Salinity
(ppt)
Oxygen
(mL/L)Temperature
(°C)
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Steel Corrosion Model – MelchersSteel Corrosion Model Steel Corrosion Model –– MelchersMelchers
Corrosion Loss
ra rs
ro
ca
cs
ta
Localized anaerobic conditions have developed
Exposure Period
Phase 0Phase 1
Phase 2Phase 3
Phase 4
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Water Temperature Impact – MelchersWater Temperature Impact Water Temperature Impact –– MelchersMelchers
0.4
0.35
0.3
0.25
0.2
0.15
0.1
0.05
00 1 2 3 4 5 6
Exposure Period (years)
Cor
rosi
on L
oss
(mm
) 20°C28°C
10°C4°C
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Bio-film Formation – DreeszenBioBio--film Formation film Formation –– DreeszenDreeszen
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Bio-film Formation – BorensteinBioBio--film Formation film Formation –– BorensteinBorenstein
(1)= O2 + 2H2O + 4e- → 4OH- (cathodic)
(2)= Fe → Fe++ + 2e- (anodic)
(3)= 4Fe++ + O2 + 10H2O → 4Fe(OH)3 + 8H+
(tubercle formation)
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Rusticles – Titanic - Droycon BioConcepts Inc.Rusticles – Titanic - Droycon BioConcepts Inc.
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Rusticles – Composition – Pellegrino et. al.Rusticles Rusticles –– Composition Composition –– Pellegrino et. al.Pellegrino et. al.
• Titanic Rusticles – 20-35% Iron• Other Shipwrecks – 79.7-92.2% Iron
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Rusticles – Structure – Cullimore et. al.Rusticles Rusticles –– StructureStructure –– CullimoreCullimore et. al.et. al.
Central Water Channel
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Rusticles – Structure – Cullimore et. al.Rusticles Rusticles –– Structure Structure –– CullimoreCullimore et. al.et. al.
γFe3+O(OH)
αFe3+O(OH)
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Rusticles – Structure – Frankel et. al.Rusticles Rusticles –– Structure Structure –– Frankel et. al.Frankel et. al.
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What Do Rusticles Do? – Ray et. al.What Do Rusticles Do?What Do Rusticles Do? –– Ray et. al.Ray et. al.
(Pitting)
After
Before
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• Corrosion occurs in a hypoxic environment?
ConclusionsConclusionsConclusions
• Does corrosion occur at 1800m depth?
• Is corrosion life predictable?
),,,( 2 pHvOTfr oo
•
• Rusticles evidence of steel corrosion?
• Should corrosion allowances be maintained?
• Synthetic Rope Moorings corrosion solution?
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AcknowledgementsAcknowledgementsAcknowledgements
• Co-Authors– Luc Chabot– Jim Jenkins– Brett Warren
• Conference Reviewers and Administrators– Ron Riggs– René Huijsmans– Joel Witz– Johann Wichers
• American Society of Mechanical Engineers• Kivi Niria• OMAE 2011
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E x p e c t M o r e . . . G e t M o o r .
QUESTIONS?QUESTIONS?