IHC Offshore Tools
IHC Hydrohammer
Piling hammers
Noise Mitigation Systems
IHC Handling Systems
Internal/external lifting tools
leveling tools
Gripper & Guiding tools
Upending tools
IHC Seasteel
Piling templates
Fast Frame
TiNS & TiS
Version: 04-2014
2.916 piles installed for wind foundations in 59 projects
2.205 Mono-Piles - 667 Jacket Piles - 30 Power Station Piles - 14 Metmast Piles
IHC Hydrohammer equipment
IHC Handling Systems equipment
Realized with Noise Mitigation
Under construction with Noise Mitigation
IHC Sea Steel Template Solution
Reliable pile driving & handling equipment
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Pile diameters from 1.52 m up to 6.50 m
Hammer Types SC-150 up to S-2000
Water depths 0 up to 45 m
Internal Lifting Tools ILT
Up-End Systems
Levelling Systems
The piling innovator
expected
2014
expected
2014
Noise Mitigation System
S2000
S2000
Research - Test – Commercial projects
6,0m
6,5m
23m
30m
S1800
6,5m
S800
Hammer
kilo Joule
er
Pile
Diameter
H2O
S800
S30
0,3m
S90
3m
1,2m
S300
4m
2,2m
8m
3,5m
30m
3,5m
30m
30m
Variations:
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Water depth
Location
Sea floor conditions
Weather conditions
Diameter pile
Hammer size/force
Running/fixed pile
Temperature
Sea level (waves)
Salt percentage
Vessel type
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Indications
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Back ground noise
North Sea
100 - 110 dB
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Total noise with vessel
stand-by on side
130 - 140 dB
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Rain increases the back
ground level
10 - 15 dB
IHC-NMS is a two systems integrated solution
Air isolated barrier and a contained bubble screen mitigating respectively low/high frequencies
Air Isolated Barrier, using different medium & materials
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Outer screen
Air gap between inner/outer screen
Inner screen
Isolated inner & outer screen
Contained Bubble Screen
• Multi level bubble injection system (water depth compensated)
• Multi size bubble injection (water depth compensated
Extra features
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Adjustable Upper Guiding
Fixed Lower Guiding
Rotation Tool
Inclination Tool
Global Positioning System
Preservation protection system
Modular system
NMS – awarded projects execution 2014
Riffgrund NMS-6000
Butendiek NMS-6500
Riffgrund NMS-6000
OWF Riffgrund started 01-2014
NMS-6000/34 Hammer S2000 - Hs 2,0 m - Current 0,8 m/s - 80 Mono-Piles
Repair Axial supports
12 axial cushioning supports – 12 radial cushinoning supports (total 24)
NMS-6000 Riffgrund project
Axial rubber cushioning top
NMS-6000 Riffgrund project
double set of radial rubber cushioning @ top section
Performed Tests: FEM analyses NMS design
Engineering estimation of “Eigen” Frequency NMS
Performed Tests - Acceleration tests on inner and outer screen
tests: after assembly – during piling – after refurbishing – during piling
NMS-6000 Riffgrund project
Axial stiffening middle section Eemshaven acceleration Tune Test
NMS-6000 Riffgrund project Noise Results Pile 01
40 blows per 25 cm – SEL 163 dB – 1400 kJ
NMS-6000 Riffgrund project Noise Results Pile 15
Adaptive pile driving @ reduced energy max 59 blows/min
NMS-6000 Riffgrund project Noise Results Pile 16
Adaptive pile driving @ reduced energy max 59 blows/min
NMS-6000 Riffgrund Muller-BBM Report
Independent report based on measurements Baker Consultancy
With
NMS
With
NMS
Without
NMS
With
NMS
With
NMS
Without
NMS
NMS-6000 Riffgrund Muller-BBM Report
Independent report based on measurements Baker Consultancy
Environmental situation before NMS
No preventive measures were used
without NMS
160
Background noise level
Pingers & Seal and soft blows
The equipment scares away harbor porpoises to prevent harm
without NMS
160
Background noise level
Questioning: are Pingers & Seal scarers necessary?
Is this equipment improving or deteriorating the conditions
160
Background noise level
with NMS
Questioning: are Pingers & Seal scarers necessary?
Is this equipment improving or deteriorating the conditions
160
Background noise level
with NMS
NMS – awarded projects execution 2014
Butendiek NMS-6500
Butendiek NMS-6500
OWF Butendiek started 30-03-2014
Noise Mitigation by NMS-6500 – Piling equipment S2000
Variations on SEL values by:
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Water depth
Location
Sea floor conditions
Weather conditions
Diameter pile
Hammer size/force
Penetration speed
Running/fixed pile
Temperature
Sea level (waves)
Salt percentage
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Noise level indications North Sea:
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North Sea with back ground noise
100 - 110 dB
Total noise with vessel stand-by on side
130 - 140 dB
Rain increases the back ground level
10 - 15 dB
NMS air systems
Water removing from annulus by pressurized air and contained bubble curtain
NMS = 360° current and wave independent mitigation
Diameter 1500 m circular protection all directions
covered area = 442 m2
Current
NMS Benfits:
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bubbles emerge @ the release point
Limited air supply: 20 m3/min = 130 kW
Less CO2 emission (vessel & compressors)
Air bubbles rise with 0.25 m/s
Air released @ 30 m water depth will take 120 s to reach the surface
With a current of 1 m/s the bubbles emerge @ 120 m from the release point
IHC Piling Methods
High Frequency - Low Energy
Increased Blow Rate approx. 90 blows per minute (standard = 40 / min)
Increased Blow Count of approx. 60 blows per 25 cm
Resulting in lower impact energy and a lower noise emission
Advantages
• Decreased pile stress = reduced fatigue
• Reduced load on piling equipment
• Minimum influence in piling time depending on soil
• Lower noise level 3-6 dB SEL
Disadvantages
• Hard & Software improvements required
IHC Piling Methods
Smart Pile Driving - programmed SPD Expected 2015+
Pile driving with real-time monitoring
• Pile penetration per 10 blows
• Noise level per blow @ 750 meter
• Impact energy
• Blow count
Advantages
• Immediate intervention if the noise requirements are
exceeded
• Optimization of piling time (energy/frequency)
• Decreased pile stress resulting in reduced fatigue damage
• Less restrictions on pile design
• Reduced load on piling equipment
• Primary or back-up noise mitigation measure
• “SMART” piling by “smart IHC operators” available
Disadvantages
• Hard & Software improvements in development
“Efficient Pile Driving” EPD a new way of piling
Reducing of the piling energy = reducing the impact on the environment
Possible future piling campaign
Increased Blow Rate approx. 80-90 blows per minute
Increased Blow Count of approx. max 100 blows per 25 cm
After reaching 100 blows /min energy will be increased gradually
Challenges:
• the data processing 30 sec – 60 sec
• using a near field array (testing)
Benefits:
• Less noise
• Less CO2 emission
• Less fatigue in pile
• Less fatigue on equipment
Challenges for the next generation NMS-8000
Past performance is no guarantee for the future.
Realizing the noise mitigation performance regardless of:
• Hammer energy and size
• Mono Pile dimensions
• Water depths & Soil conditions
• Future legislation
• Legislation in different countries
Methods:
• Modifications to air gap and bubble injection systems
• HiLo, Smart Pile Driving, Efficient Pile Driving
• Introduction of a 3th mitigation system
• R&D analyses of data, FEM prediction, factory tuning.
• R&D ground born noise research,
it’s time to make a change
Special thanks for corporation & sharing information!
Collaboration is the key to innovation
Thank you for your attention
Henk van Vessem
GSM +31653149031
h.vanvessem@ihcmerwede.com