OFFSHORE CAGE FARMING Experimental Study under influence of waves - - PowerPoint PPT Presentation
NEW BIRD NET DESIGN FOR OFFSHORE CAGE FARMING Experimental Study under influence of waves Presented by : ALESSANDRO CIATTAGLIA Sales & Marketing Manager BADINOTTI GROUP Spa TABLE OF CONTENT Experimental Study Presentation Introduction
Experimental Study under influence of waves
Sales & Marketing Manager BADINOTTI GROUP Spa
ALESSANDRO CIATTAGLIA
Presented by :
Experimental Study Presentation
Introduction Experimental Setup Methodology Measurement & Analysis Results
BADINOTTI GROUP provides:
Serving your Fishery and Fish Farming Businesses since 1910 04
Cage Aquaculture Turnkey Project
01
Feasibility Study for Fish Farming Business
02
Cage Nets, Anti-Predator Nets
03
Cage Mooring Design and Calculation
04
Aquaculture Equipment
05
Net Services, Treatments and Maintenance
06
Nets for Commercial Fishing
07
PVC Floats, Twine and Ropes
08
HDPE Boats
09
1910 1950 2000 2009
OFFSHORE MARICULTURE CONFERENCE Barcelona 6-8 April 2016
Worldwide Factories and Branches
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Fishing Nets
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Fish Farming Nets – Fishing Nets Sport and Safety Nets
05
Badinotti Group - Italy Head Office
Badinotti Net Services Canada
Fish Farming Net Services
Badinotti Net Services Chile
Fish Farming Net Service
Badinotti Marine Equipment Chile
Mooring Design and Installation Cage and Boat Tugging
Badinotti Marine Equipment Italy
HDPE Boats
P = Production SV = Services SA = Sales Office
Year 2014 – USD
8.500K
North America
11.000K
Europe, Africa & Middle East
21.500K
South America
Aquaculture Fishing Services
06
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Year 2015
Canada
Europe
Chile
Peru
07
OFFSHORE MARICULTURE CONFERENCE Barcelona 6-8 April 2016
Problem Solving: Bird Net Protection in High Energy Site Problem Focus : Solution Focus :
Net has stressing and stretching movements and consequently rips off Improving netting strength generates breaks on the handrail pipes Netting falls into the water and consequently the fouling grows UV radiation influence Netting panels cut and assembled in diamond mesh shape More elastic behaviour generates a lighter netting requirement No cross top ropes are needed so less breaks risk on the handrail A lighter netting requires a simpler support Special Resin Treatment
Problem Clarification Idea Generation Test Problem Results Idea Selection 08
OFFSHORE MARICULTURE CONFERENCE Barcelona 6-8 April 2016
The Flume Tank
OFFSHORE MARICULTURE CONFERENCE Barcelona 6-8 April 2016
Technical information: Dimensions Overall: L:30m x H:6m x W:8m Measuring section: L:21.3m x H:2.7m x W:8m. Volume of water: 1200 m3. Windows: W20m x Η3m Propulsion Four propellers driven by AC motors of 55 KW generate the flow. The maximum speed of water thorough the test section is 1 m/s. The bottom of the test section is covered by a conveyer belt type made of nylon. The speed of the conveyer belt is adjustable and can be locked with speed of the water or can be driven at a set speed.
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Experiment performed in a model scale 1:25
Wave Generator HD Video Cameras Flume Tank Floating Rings
The waves used for the experiment had a significant height of 5.5 m and a period of 7 seconds. High definition surveillance cameras were positioned at different viewpoints The sketch above shows how the net cage system is set up in the flume tank. The distance between the mooring points is 7,5 m corresponding to 188 m in full scale this implies that only a part of the mooring lines are modelled in the flume tank. It is however assumed that this will only have minor influence
A flexible floating ring with a diameter of 2 meters (scale 50mt) was used to support the bird net. The buoyancy of the ring was obtained using a cylinder of waterproof rubber foam tread on a thin steel rod. The floating ring was moored using a multi legged connection in each corner of a surrounding square rope frame. This frame was supported by mooring lines attached to the walls of the flume tank.
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OFFSHORE MARICULTURE CONFERENCE Barcelona 6-8 April 2016
Experiment performed in a model scale 1:25
Bird Nets Strain Gauges Hamster Wheel Motion Tracking
Two Nylon nets were tested. A traditional design with essential square meshes and a new design with diamond meshes all along the floating ring. Two strain gauges were mounted on the bird net, one in the front of the net and one in the back. The strain gauge was secured to the handrail of the floating ring and the other end to the netting
A hamster wheel with a diameter of 60 cm (scale 13mt) was used. It was secured in the middle of the floating ring with four lines
The bird net was equipped with 16 reflectors. Eight reflectors on the edge of the bird net towards the floating ring. Five reflectors on the net, positioned over the Hamster Wheel. Three reflectors between the floating ring and the hamster wheel on the bird net closest to the incoming waves.
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OFFSHORE MARICULTURE CONFERENCE Barcelona 6-8 April 2016
Wait a minute for the wave to stabilize Log a simultaneous time series of the motion of the 16 reflectors. The length of the time series is 100 seconds (model scale values). This will correspond to a 500 sec. period in full scale. Make a video footage of the behavior of the system consisting of the floating ring and the Bird net.
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Initiate the Wave
OFFSHORE MARICULTURE CONFERENCE Barcelona 6-8 April 2016
Video Camera Recording
16 Traditional Bird Net Design New Bird Net Design
OFFSHORE MARICULTURE CONFERENCE Barcelona 6-8 April 2016
Diameter Variation
+/- 4mt
Perpendicular Wave In Wave Direction
44,1mt 54,1mt +/- 1 mt 46,9mt 47,2mt
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Diameter of the Flexible Floating Rings
50,5mt 50,2mt 52,2mt 46,6mt
OFFSHORE MARICULTURE CONFERENCE Barcelona 6-8 April 2016
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Tension on the Flexible Floating Rings Average Tension
In Front In Aft
1075 kg
1688 kg 768 kg 307 kg
85 kg
OFFSHORE MARICULTURE CONFERENCE Barcelona 6-8 April 2016
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Bird Nets Comparison Test
The diameters measured MIN 47m and MAX 56 m. However, the range (min to max) is 3 meters for the traditional design, while the range is about 8 meters for the new design. The deformation of the floating ring can be more than doubled when a bird net of the new design is attached to the ring compared to the bird net of the traditional design; this is mainly due to the difference in the shape of the meshes in the two design. The Tension Forces caused by the front waves is decreased
design.
OFFSHORE MARICULTURE CONFERENCE Barcelona 6-8 April 2016
Due to the higher capacity to withstand tension forces (approx 3 times more), it could be possible to use light netting Lighter netting in bird net assembling means cheaper price. Furthermore the new design uses same work time and material of the traditional design. Using a lighter birdnet means saving buoyancy on the birdnet support and keeping the netting always above the waterline level easier.
Strength Weight Price
21 Advantages in the new design
OFFSHORE MARICULTURE CONFERENCE Barcelona 6-8 April 2016
For Your Kind Attention
BADINOTTI GROUP spa Viale Ortles, 5 – 20139 MILANO - ITALY +Tel. +39.02.5391070 +Mob. +39.348.3856441 alessandro.ciattaglia@badinotti.com
OFFSHORE MARICULTURE CONFERENCE Barcelona 6-8 April 2016