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Jan Wolter Oosterhuis
Dockwise USA Inc. - Houston
Engineering aspects of heavy transport shipping
- achieving the inconceivable -
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Introduction to Dockwise
Development of Heavy Transport
Engineering aspects of Heavy Transport
Float over operations
Content
open-deck vessels
2 dock-type vessel
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The Dockwise fleet
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4 yacht carriers
The Dockwise network
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The Dockwise business
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Up to late 70’ties, all jack-ups, semi-submersibles etc. were
moved by means of wet tow.
How did the heavy-transport vessels develop throughout the
years?
History of heavy transport
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1976 Wijsmulller / Smit
ƒ Delivery Ocean Servant 1 / Giant
ƒ Semi-submersible barge
History of heavy transport
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1979 Wijsmuller
ƒ Delivery of Super Servant 1
ƒ Semi-submersible vessel
ƒ Diesel-direct driven
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History of heavy transport
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1983 Wijsmuller
ƒ Delivery of Mighty Servant 3
ƒ Semi-submersible vessel
ƒ Diesel-electric driven
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History of heavy transport
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Jumboised Mighty Servant 1
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„ Increased beam from 42 to 63
meter
„ Increased submersion draft
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Jumboised Blue Marlin
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Jumboised Blue Marlin
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ƒ Blue Marlin during maiden
trip after modification
14.9 m
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„ increased submersion draft
Jumboised Blue Marlin
12.0 m
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How did the cargo size develop throughout the years?
Cargo size development
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ƒ Weight increase 550 tons to 1470 tons
ƒ VCG increase from 27 to 45 m
Container cranes
Cargo size development
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Deepwater drilling rigs
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Cargo size development
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ƒ 1st deepwater
drill rig Shell’s
Bluewater 1
Deepwater drilling rigs
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Cargo size development
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ƒ Ocean
Baroness on
Blue Marlin
Semi submersibles
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Cargo size development
In 59 days
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(equals 150 fully loaded
747’s, or 330 empty ones)
59,500 mT on Blue Marlin
From Korea to US Gulf
BP Thunderhorse PDQ
Jackup rigs
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Cargo size development
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280 m
Jackup rigs
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Cargo size development
The Trump Building, New York
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ƒ Loadout analysis
ƒ Stability analysis
ƒ Environmental criteria
ƒ Wind load analysis
ƒ Motion analysis
ƒ Seafastening analysis
ƒ Support/cribbing analysis
ƒ Discharge analysis
Transport design
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Loadout analysis
float on
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1 – Deck preparations:
float on
Loadout
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2 – Loading operation:
float on
Loadout
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2 – Loading operation:
float on
Loadout
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Float on animation
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skid on
Loadout analysis
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2 modules for
Sanha field
(offshore WAF)
skidded on the
Black Marlin
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roll on
Loadout analysis
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2 modules for P50 rolled on
board SS4
Loadout analysis
lift on
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Calculation of (transverse) stability
Stability analysis
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GZ-curve
Stability analysis
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Yes, for the stability range!
Does it matter whether the cargo has buoyancy?
Stability analysis
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GZ curve with/without cargo buoyancy modelled:
Stability analysis
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When initial stability is not sufficient, the GM may be increased by
adding sponsoons:
Stability analysis
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Æ Lack of waterplane area!
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Float-on/off operations have problems similar to drydocks:
Submerging operations
Stability analysis
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Submerging operations, standard steps:
Stability analysis
Stability analysis
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GHS model of
vessel +
cargo
Stability analysis
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Ballast sequence
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Transit loading condition
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Environmental conditions
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Fwind = 6 0.0623 x Vw2 x A x Cs x Ch / 1000
Windload analysis
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ƒ Linear strip theory
using Shipmo
ƒ Non-linear 3D
diffraction theory
using AQWA
ƒ Modeltests
Motion analysis
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Cribbing / support analysis
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ƒ Rule of thumb:
max static +
dynamic cribbing
pressure ~ 20
kg/cm2
ƒ Cribbing for
Kizomba B TLP
Standard seafastening
chocks used for floating
cargoes
Seafastening analysis
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Seafastening analysis
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Purposely designed
seafastening
ƒ Course alterations made if
necessary
ƒ During transit the captain is
informed twice daily about
the expected weather
conditions on route
Voyage
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Float off
Lift off
Skid / roll off
Launching
Float over
Forklift
Methods of discharge:
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Fork-lift discharge method
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Loading from construction site
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Float-over installation topside
2003: TotalElf Amenam (11,200 t)
2004: ConocoPhilips Bayu-Undan (11,500 t)
2004: ConocoPhilips Bayu-Undan (13,900 t)
2005: ExxonMobil EAP GN-deck (18,000 t)
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2007: Woodside Angel (8,000 t)
2008: ExxonMobil EAP GX-deck (14,500 t)
Future projects
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Track record
Float overs / deck matings
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Float overs / deck matings
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Installation operation
Float overs / deck matings
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Float-over video
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•Efficient
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•Cost effective
•Fast
•Safe
Why?
Float overs / deck matings
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Blue Marlin can
carry 78000 mT,
which is equal to
382 statues of
liberty
Fun fact:
CONCLUDING:
If we cannot move it, it cannot be moved !!!!!