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Floatover project bried
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Float-over presentation
December 2002
OFFSHORE TRANSPORT
& INSTALLATION
ONSHORE &OFFSHORE
STEELCONSTRUCTION
OFFSHOREHEAVY
TRANSPORT
FIELD DEVELOPMENTCONCEPTUAL &
DETAILED ENGINEERING
Heerema Group Divisions
Heerema Marine ContractorsProduct range
Deepwater Construction
Removal
Float-over
Facility installation
Heerema Marine ContractorsProduct range
Deepwater Construction
Removal
Float-over
Facility installation
Contents
IntroductionMethod statement overviewRelationship between componentsFloat-over componentsConclusions
Float over product group
Since 2001Jan Groot – Frank LangeObjective is to establish Float-over as a Heerema Product GroupTendering various prospectsProduct development ; Forklift
Executed float-overs in open seas
Aker Maritime (N)5,000Lan Tay/ Lan Do2002
Technip/Saipem17,000Cakerawala2002
B&R/Heerema11,500Malampaya2001
B&R6,000Wandoo1997
ETPM4,000EPKI1997
Saipem6,000M11996
Saipem7,500M31996
ETPM/Technip9,500Cobo Pambi1996
ContractorTopsides weight (T)ProjectYear
Future Float-overs
HHI/Noble Denton9,000Bunga Raya2003
Saibos/Technip12,000Amenan2003
Aker Maritime (N)/ Clough14,000Bayu-Undan2003
Aker Maritime (N)/ Clough10,000Bayu-Undan2003
Saipem8,000Helang/Layang2002
ContractorTopsides weight
(T)ProjectYear
Upcoming Float-overs
HHI/Noble Denton9,000Bunga Raya2003
Saibos/Technip12,000Amenan2003
Aker Maritime (N)/ Clough14,000Bayu-Undan2003
Aker Maritime (N)/ Clough10,000Bayu-Undan2003
Saipem8,000Helang/Layang2002
ContractorTopsides weight (T)ProjectYear
Dockwise
Forklift development
Started off with ExxonMobil HawkesTwo phasesPhase 1 finishedWorking on phase 2Learned about catamaran
No Market at present
Forklift
Contents
IntroductionTender ActivitiesMethod statement overviewRelationship between componentsFloat-over componentsConclusions
Contents
IntroductionMethod statement overviewRelationship between componentsFloat-over componentsConclusions
Method statement overview
5 phases in float-over sequence– Stand off– Docking– Mating– Vertical load transfer– Un-docking
Stand off position
Barge moored with anchorsDocking lines
Tug 1Tug 2
Docking
Cow horns for entry
Fendering for tight fit
Mating (1)
Mating lines forprecise positioningLoad transfer by
Ballasting and Leg Mating Units
Mating
Vertical load transfer
Load transfer on jacket
Undocking
Undocking with tugsand docking lines
Contents
IntroductionMethod statement overviewRelationship between componentsFloat-over componentsConclusions
Relationship between components
Platform and equipment
Float-over concept Environment
- Jacket + foundation
- Deck
- Transportation barge
- Swell- Workability- Safety
- Docking - Mating - Vertical load transfer - Fendering- Ballasting
Relationship between components
Platform and equipment
Float-over concept Environment
Barges for decks > 10,000 mT
H-541 42 mS45 42 mBlack Marlin 42 mMighty Servant 3 40 m
400’ Piggy Back on Dockwise
Relationship between components
Platform and equipment
Float-over concept Environment
Environmental issues
Workability is governed by Seastate HeaveWeather outlook (i.e. window length)
Accepting lower workability reduces design forces
Relationship between components
Platform and equipment
Float-over concept Environment
Contents
IntroductionMethod statement overviewRelationship between componentsFloat-over componentsConclusions
5 Float-over components
Docking systemMatingFenderingVertical Load transferBallasting
Docking
2 systems used on Malampaya
TugsAnchors/docking lines
2 Docking systems
Docking System
Towing tug
Docking lines
Assisting tug
Docking tug
Anchor lines
Anchor/Docking lines
Mating lines
precise positioning of the deck cones above the jacket guidesStiffness of system versus workabilty8 lines used on Malampaya, 4 proposed in future
Malampaya mating stretchers
Malampaya Fendering
Loose fitTight fit
Vertical Load transfer
Hi-deck method – Leg Mating UnitsUni-deck method - Hydraulics
Leg Mating Units
Mating Cone
Rubber
Receptor
Sand
Ballasting
Malampaya 20,000 m3/hr SubcontractedDockwise vessels 12,000 m3/hr internal
Conclusions
Float-over is complicated, but feasibleRelationship between components require T&I contractor input in FEED studyFew vessels available for topsides > 10,000 mT
More information
www.heerema.com/marine/float-over
Jan Groot tel + 31 71 5799466 Product Manager
