traditional view: simple, efficient technology, using limited resources
DESCRIPTION
The use of Appropriate Technology in the design of new dredgers ir.Robby de Backer, ir.Frederik Deroo Jan De Nul N.V. APPROPRIATE TECHNOLOGY: Technology or engineering that takes special consideration of its social and environmental ramifications. Traditional view: - PowerPoint PPT PresentationTRANSCRIPT
The use of Appropriate Technology in the design of new dredgers
ir.Robby de Backer, ir.Frederik DerooJan De Nul N.V.
APPROPRIATE TECHNOLOGY:
Technology or engineering that takes special consideration of its social and environmental ramifications.
Traditional view:
• Simple, efficient technology, using limited resources.
• Immediately applicable in daily life.
• Mostly applied to developing countries.
APPROPRIATE TECHNOLOGY:
Technology or engineering that takes special consideration of its social and environmental ramifications.
Applied to Dredging.
• Use design, materials and equipments with lowest possible social and environmental negative impact in the design and construction of Dredgers.
• Use design, materials and equipments with lowest possible social and environmental negative impact during the operation of Dredgers.
• Use operational methods with lowest possible social and environmental negative impact during execution of the project.
APPROPRIATE TECHNOLOGY:
Technology or engineering that takes special consideration of its social and environmental ramifications.
Applied to Dredging.
Compliance with the principles of Appropriate Technology
• Holistic approach.
• AT = Efficient Dredgers (social aspect ?)
Investment plan 2007-2011(ordered)
PROJECT NR. DESCRIPTION SHIPYARD
8023 7500 m3 Hopperdredger “AL-IDRISI” Buyoung, Korea
8030 7500 m3 Hopperdredger “VITUS BERING” Buyoung, Korea
8025 46000 m3 Hopperdredger “CRISTOBAL COLON” La Naval, Spain
8031 46000 m3 Hopperdredger “LEIV EIRIKSSON” La Naval, Spain
8064 Self-propelled Cutter Suction Dredger (23 500 kW) “IBN BATTUTA” Uljanik, Croatia
8065 Self-propelled Cutter Suction Dredger (23 500 kW) “ZHENG HE” Uljanik, Croatia
8066 Self-propelled Cutter Suction Dredger (23 500 kW) “FERNAO DE MAGALHAES”
Uljanik, Croatia
8067 Self-propelled Cutter Suction Dredger (23 500 kW) Uljanik, Croatia
8474 Backhoe Dredger (3700 kW) “POSTNIK YAKOVLEV” Xinhe Tianjin, China
8623 Side Stone Dumping Vessel (6000 ton) “WILLEM DE VLAMINGH” Buyoung, Korea
8576
8577
3700 m3 Splitbarges (2 units) “BOUSSOLE”, “ASTROLABE” Xinhe Tianjin, China
8578 to 8581 1800 m3 Splitbarges (4 units) “CONCEPCION”, “SANTIAGO”, “TRINIDAD”, “VICTORIA”
Xinhe Tianjin, China
8032 3700 m3 Splithopperdredger “DE LAPEROUSE” Xinhe Tianjin, China
8622 Fallpipe & mining Vessel (30 000 ton) “SIMON STEVIN” La Naval, Spain
8033 3400 m3 Hopperdredger “ALVAR NUNEZ CABECA DE VACA” Xinhe Tianjin, China
8034 3400 m3 Hopperdredger “SEBASTIANO CABOTO” Xinhe Tianjin, China
8035 30500 m3 Hopperdredger La Naval, Spain
8582 to 8585 3700 m3 Splitbarges (4 units) Xinhe Tianjin, China
APPROPRIATE TECHNOLOGY:
Technology or engineering that takes special consideration of its social and environmental ramifications.
Applied to Dredging.
• Design and construction of a Dredger.– Conceptual design.– Material selection.– System design.– Energy & emissions.
• Operational methods of a Dredger.– Optimal fleet management.– Rules & regulations.– Cost.
APPROPRIATE TECHNOLOGY:
Technology or engineering that takes special consideration of its social and environmental ramifications.
Applied to Dredging.
Design and construction of a dredger:
• Conceptual Design: EFFICIENCY, APPLICATION OF MODERN DESIGN TOOLS, ADVANTAGE OF “YOUNGER” VESSELS
0
0.01
0.02
0.03
0.04
0.05
0.06
0.07
1975 1980 1985 1990 1995 2000 2005 2010 2015
Building Year
Sp
ecif
ic p
ow
er [
kW/k
n*t
on
]
Specific Power [kW/kn*ton] for hopperdredgers 2000 to 5000 m3
0
0.005
0.01
0.015
0.02
0.025
0.03
0.035
0.04
0.045
1996 1998 2000 2002 2004 2006 2008 2010 2012
Building Year
Sp
ecif
ic P
ow
er [
kW/k
n*t
on
]
Specific Power [kW/kn*ton] for Jumbo hopperdredgers
Ratio Deadweight/Light Ship Weight for Jumbo Hopperdredgers
0
0.5
1
1.5
2
2.5
3
3.5
1996 1998 2000 2002 2004 2006 2008 2010 2012
Building Year
Ra
tio
De
ad
we
igh
t/L
igh
t S
hip
We
igh
t
Ratio Light Ship Weight/L*B*H for Jumbo Hopperdredgers
0
0.05
0.1
0.15
0.2
0.25
0.3
1996 1998 2000 2002 2004 2006 2008 2010 2012
Building Year
Rat
io L
igh
t S
hip
Wei
gh
t/L
*B*H
[to
n/m
3]
APPROPRIATE TECHNOLOGY:
Technology or engineering that takes special consideration of its social and environmental ramifications.
Applied to Dredging.
Design and construction of a dredger:
• Conceptual Design: EFFICIENCY, APPLICATION OF MODERN DESIGN TOOLS , ADVANTAGE OF “YOUNGER” VESSELS
• Material Selection: CRITERIA FOR “AT” COMPLIANCE ARE REQUIRED
APPROPRIATE TECHNOLOGY:
Technology or engineering that takes special consideration of its social and environmental ramifications.
Applied to Dredging.
Design and construction of a dredger:
• Conceptual Design: EFFICIENCY, APPLICATION OF MODERN DESIGN TOOLS , ADVANTAGE OF “YOUNGER” VESSELS
• Material Selection: CRITERIA FOR “AT” COMPLIANCE ARE REQUIRED
• System Design: EFFICIENCY
APPROPRIATE TECHNOLOGY:
Technology or engineering that takes special consideration of its social and environmental ramifications.
Applied to Dredging.
Design and construction of a dredger:
• Conceptual Design: EFFICIENCY, APPLICATION OF MODERN DESIGN TOOLS , ADVANTAGE OF “YOUNGER” VESSELS
• Material Selection: CRITERIA FOR “AT” COMPLIANCE ARE REQUIRED
• System Design: EFFICIENCY
• Energy & Emissions: EFFICIENCY
APPROPRIATE TECHNOLOGY:
Technology or engineering that takes special consideration of its social and environmental ramifications.
Applied to Dredging.
Operation of a Dredger:
• Optimal fleet management: USE THE MOST APPROPRIATE DREDGER
Vessel A B C
Hopper Capacity [m3] 11300 7500 4400
Dredging draught [m] 9.10 8.15 7.30
Deadweight at dredging draught [ton]
18600 11800 8130
Project parametersDredged spoil: medium to fine sand, D50=150 mu
Dredging depth: 15 mSailing distance from dredge site to disposal site: 15 Nautical MilesDisposal method: Bottomdoor dumpingTotal amount of spoil to be dredged: 1 000 000 m3 Maximum loaded draught due to local constraints: 8 m
Vessel A B C
Weekly production
100% 75% 48%
Cost 100% 91% 120%
Project duration 100% 133% 206%
Total amount of fuel consumed for
project
100% 83% 96%
APPROPRIATE TECHNOLOGY:
Technology or engineering that takes special consideration of its social and environmental ramifications.
Applied to Dredging.
Operation of a Dredger:
• Optimal fleet management: USE THE MOST APPROPRIATE DREDGER
• Regulations: “HOLISTIC APPROACH”, USE OBJECTIVE PARAMETERS
Project parametersDredged spoil: medium to fine sand, D50=150 mu
Dredging depth: 15 mSailing distance from dredge site to disposal site: 15 Nautical MilesDisposal method: Bottomdoor dumpingTotal amount of spoil to be dredged: 1 000 000 m3
Vessel A
Hopper Capacity [m3] 11300
Dredging draught [m] 9.10
Deadweight at dredging draught [ton]
18600
Vessel A, loading without
overflowing
Vessel A, loading with overflowing
Weekly production 100% 167%
Cost 100% 61%
Project duration 100% 60%
Total amount of fuel consumed for project
100% 60%
APPROPRIATE TECHNOLOGY:
Technology or engineering that takes special consideration of its social and environmental ramifications.
Applied to Dredging.
Operation of a Dredger:
• Optimal fleet management: USE THE MOST APPROPRIATE DREDGER
• Regulations: “HOLISTIC APPROACH”
• Cost: “COST” OF SIDE-EFFECTS TO BE TAKEN INTO ACCOUNT ?
APPROPRIATE TECHNOLOGY:
Technology or engineering that takes special consideration of its social and environmental ramifications.
Applied to Dredging.
CONCLUSIONS
• New design tools needed.
• Holistic principle.
• Importance of a modern, versatile fleet.
