WO2021053361A1 - Polypod deep sea aquaculture farm - Google Patents

Polypod deep sea aquaculture farm Download PDF

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Publication number
WO2021053361A1
WO2021053361A1 PCT/IB2019/000815 IB2019000815W WO2021053361A1 WO 2021053361 A1 WO2021053361 A1 WO 2021053361A1 IB 2019000815 W IB2019000815 W IB 2019000815W WO 2021053361 A1 WO2021053361 A1 WO 2021053361A1
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Prior art keywords
polypod
construction
platform
wave
marine
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PCT/IB2019/000815
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French (fr)
Inventor
Antonis KIMONIDES
Original Assignee
Kimonides Antonis
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Priority to PCT/IB2019/000815 priority Critical patent/WO2021053361A1/en
Publication of WO2021053361A1 publication Critical patent/WO2021053361A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K61/00—Culture of aquatic animals
    • A01K61/60—Floating cultivation devices, e.g. rafts or floating fish-farms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
    • B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
    • B63B1/10—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
    • B63B1/107—Semi-submersibles; Small waterline area multiple hull vessels and the like, e.g. SWATH
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
    • B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
    • B63B1/10—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
    • B63B1/12—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly
    • B63B2001/128—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly comprising underwater connectors between the hulls
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
    • Y02A40/81—Aquaculture, e.g. of fish

Definitions

  • This patent pertains to a floating structure for deep sea aquaculture and fish farming operations.
  • Technical aspects of the structure include; The floating structure which will host the aquaculture operations is capable to withstand exposed high wave, high current environments; Fish farming applications including feed stock storage and feeding equipment; and autonomous and remote controlled systems for monitoring and operation of the aquaculture farms.
  • Patent applications can be separated in four Areas, namely: 1. autonomous systems, 2. remote operation, monitoring and operational support 3. Structures for exposed locations and 4. vessels for exposed locations.
  • the proposed technology concerns category 3 Structures for exposed locations.
  • Offshore feeding technologies concern to a large extent feeding barges.
  • the proposed technology based on submerged legs, offers advantages in terms of floatation, clearance above wave activity and stability, as well as reduced resistance to currents.
  • Technology offerings for submerged aquaculture systems are limited. Sal Mar has developed the first of its kind submerged system in Norway in 2016 for Ocean Farming AS. The design is based on oil and gas platform technology. The project integrates salmon cages within the floating structure. Differentiating the proposed invention from other technologies are that fact that the vertical submerged columns (polypods) double as silos offering space and cost savings. In addition, it is constructed by prefabricated parts thus can be assembled on nearest shore and hauled to site by boat.
  • the invention consists of a method for creating/increasing the buoyancy and stability of the open sea support-structure for aquaculture by achieving a minimum area of contact with the sea surface and minimizing wave-structure interaction.
  • vertical columns - ‘polypods’ support the structure, which ballasted with a concrete base, constructed in a ‘made to measure’ modular method.
  • the structure is made of marine grade steel and is constructed via prefabricated parts which are assembled ‘on site’.
  • the ‘polypod’ structure (Fig. 1) is unique in in that it facilitates the following:
  • Figure 2 Visualisation of the Polypod Figure 3: General arrangement side view Figure 4: General arrangement fore view Figure 5: Lower Section of the Structure Base Figure 6: Legs / Silos
  • the Offshore fish farming unit is non-self-propelled, autonomous and Semi-Submersible Floating. It is a Structure that can be relocated via towing.
  • a column-stabilised unit consists of a deck box with six (or eight) supporting columns / silos that are attached to submerged pontoons.
  • the Autonomous construction has two floating modulus of rectangular shape as a base, which keep the structure afloat.
  • the compartments for the feed are the six steel welded columns (polypod legs) which act as silos.
  • the internal walls of the columns are inclined at an angle of no more than 60 degrees to the horizontal.
  • the Engine Room is located above the Food Compartments / silos.
  • Control Room with a feed control station is located above the Engine Room at bow of Engine Room Superstructure.
  • An additional tube-shape Pipe Room Compartment for the ballasting system is foreseen in CL in front of Main Diesel-generator.
  • FS should start taking ballast at a cargo (feed) quantity of 46% (Assuming a feed stock density of 650 kg/m 3 ) to maintain the optimum position of the waterline and stability.
  • a 3-day Supply should be left in case of bad weather. This corresponds to about 15t of feed. In this state, the ballast tanks will be completely filled. The excess stability offered when the silos are empty facilitate towing of the Structure at sea.
  • the structure consists of separate blocks which also enables it to be transported in disassembled form.
  • the structure can be separated in the following modules:
  • the Stability of the construction can be secured in all main load conditions, including asymmetrical situations of feed arrangement in Silo Compartments through the use of water ballast. Common asymmetrical situations with propositions of water volumes in each ballast tank are taken into consideration.
  • the Engine Room has a separated Distribution Room in its fore part.
  • the Distribution Room has an inclined wall in its fore part for fixing flexible hoses for feed distribution to the farms.
  • Equipment located in the Engine Room includes:
  • Hatch for feed inlet is located on side walls of ER, three in each side.
  • the Grating platform is foreseen around ER.
  • Waterproof door is located in aft wall of ER.
  • the Engine Room is designed as aluminum superstructure on steel framed deck. Access is provided from aft watertight door. Emergency exit is provided via watertight vertical hatch at aft wall of Control Room.
  • Aquaculture is the most rapid expanding food industry in the world.
  • the worlds demand for marine food supply has led to a major decline of wild fish stocks due to over fishing. This food gap of caught fish has and will be gradually replaced by aquaculture production.
  • aquaculture has developed in near shore - sheltered, coastal environments referred to as inshore aquaculture.
  • marine aquaculture farms have explored the possibilities of moving offshore in areas where, environmental issues are less pronounced, conflicts with other coastal users are avoided and issues of space and farm size are less of a concern.
  • a new trend of multifunctional uses of offshore platforms for a combination of activities such as simultaneous energy production and aquaculture in some regions of the world, are gaining popularity.
  • Offshore aquaculture can allow operations from medium to large scale enterprises to develop with resulting economies of scale.
  • Various studies show that the potential for marine fish farming will be in the order of 5 million tons per year3 by 2050. There is therefore great potential for structures that overcome the challenges of exposed environments, which will enable the development of fish farming in such areas.
  • Offshore aquaculture evokes many benefits but also has substantial risks associated with it.
  • High installation costs, expensive feed transportation and risks to personnel working in unfavorable weather conditions are amongst the most obvious.
  • Installations in open sea have to withstand substantial weather effects such as strong currents, high waves and swells which oblige aquaculture companies to make substantial investments in mooring facilities.
  • Offshore - open sea aquaculture has thus evolved at a very slow rate and the risks involved with this type of business are substantial enough to discourage investment in development of real offshore farming.
  • a particular problem which is directly related to this application for patent, is that the feeding structures that are necessary to support open sea offshore facilities have to have the ability to withstand heavy sea conditions, with high waves and simultaneously be able to have the capacity to feed and store large quantities of fish feed.
  • the said invention offers increased stability of offshore fish farming operators thereby enabling the permanent installation of feeding platforms at aquaculture farms.
  • the most important aspect of the said invention offering significant operation and cost reduction advantages to aquaculture farming operations concerns the high autonomy of the feeding platforms which significantly reduces transport frequency and associated costs for feeding purposes.
  • the invention enables the installation of high capacity feeding platforms at deep sea.
  • the invention offers high autonomy of feeding operations reaching up to several weeks.
  • it incorporates remote controlled feeding capacities thereby minimizing the need to visit the platform to deploy permanent staff on site.
  • the aforementioned advantages of the invention can significantly improve the cost effectiveness of deep sea aquaculture and is expected to contribute to the growth of the sector.
  • a large number of existing deep sea aquaculture farms are also in need of and can benefit from installation of the platform.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Ocean & Marine Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Marine Sciences & Fisheries (AREA)
  • Zoology (AREA)
  • Animal Husbandry (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Fluid Mechanics (AREA)
  • Farming Of Fish And Shellfish (AREA)

Abstract

The invention consists of an open sea support-structure for aquaculture feeding systems and operations with increased stability and buoyancy and reduced resistance to current flow, rendering it suitable for high wave, high current environments. Vertical columns (polypods) double as silos offering space and cost savings. Constructed by prefabricated parts it can be assembled on nearest shore and hauled to site by boat. Accordingly, a marine aquaculture platform comprises a polypod structure made of marine grade steel and being able to be semi- submersed, said structure comprising: - a floating deck accommodating an engine room and a control room - a concrete base for ballasting said platform, - six or eight legs made of steel and located between said deck and said concrete base, - a vertical support extending from the deck towards the concrete base and accommodating a pump room, and - two rectangular floating modulus for keeping the platform afloat, wherein each leg accommodates a silo for fish feed. A method of providing a marine aquaculture platform in deep sea comprises: prefabricating each part of a marine aquaculture platform according to claim 1, - transporting said parts to a suitable location, and - assembling said parts on site to form the marine aquaculture platform.

Description

DESCRIPTION
Title or the Invention
POLYPOD DEEP SEA AQUACULTURE FARM
Technical Field
This patent pertains to a floating structure for deep sea aquaculture and fish farming operations. Technical aspects of the structure include; The floating structure which will host the aquaculture operations is capable to withstand exposed high wave, high current environments; Fish farming applications including feed stock storage and feeding equipment; and autonomous and remote controlled systems for monitoring and operation of the aquaculture farms.
Background Art
Given the high potential for the development of deep sea aquaculture, research in the field, and the number of patent applications have been increasing tremendously in the last years (Figure 1). Patent applications can be separated in four Areas, namely: 1. autonomous systems, 2. remote operation, monitoring and operational support 3. Structures for exposed locations and 4. vessels for exposed locations. The proposed technology concerns category 3 Structures for exposed locations.
Offshore feeding technologies concern to a large extent feeding barges. The proposed technology, based on submerged legs, offers advantages in terms of floatation, clearance above wave activity and stability, as well as reduced resistance to currents. Technology offerings for submerged aquaculture systems are limited. Sal Mar has developed the first of its kind submerged system in Norway in 2016 for Ocean Farming AS. The design is based on oil and gas platform technology. The project integrates salmon cages within the floating structure. Differentiating the proposed invention from other technologies are that fact that the vertical submerged columns (polypods) double as silos offering space and cost savings. In addition, it is constructed by prefabricated parts thus can be assembled on nearest shore and hauled to site by boat.
Figure imgf000004_0001
Figure 1. Patent applications by technology Area.
Source: Patent Landscaping Report. The Norwegian Industrial Property Office, 2016
Disclosure of Invention:
The invention consists of a method for creating/increasing the buoyancy and stability of the open sea support-structure for aquaculture by achieving a minimum area of contact with the sea surface and minimizing wave-structure interaction.
According to the solution, vertical columns - ‘polypods’ support the structure, which ballasted with a concrete base, constructed in a ‘made to measure’ modular method. The structure is made of marine grade steel and is constructed via prefabricated parts which are assembled ‘on site’.
The ‘polypod’ structure (Fig. 1) is unique in in that it facilitates the following:
- It provides a unique solution for open deep water aquaculture feeding farms in high wave environments due to its polypod design. The design’s robustness, stability and behavior under high current and high wave environments has been tested via modeling to a wave height up to 6m, while the design can be modified to higher waves. Results of stability analysis are presented in Attachment I. The structure:
• Allows for varying size farms to be designed
• Minimizes costs of construction and placement to site due to the fact that it is constructed in prefabricated parts which can be transported near the intended operation area for assembly. The polypod design allows for easy transport to site via towing Brief Description of Drawings:
Figure 2: Visualisation of the Polypod Figure 3: General arrangement side view Figure 4: General arrangement fore view Figure 5: Lower Section of the Structure Base Figure 6: Legs / Silos
Figure 7 Upper Section - Control / Engine room
Best Mode for Carrying Out the Invention:
The Offshore fish farming unit is non-self-propelled, autonomous and Semi-Submersible Floating. It is a Structure that can be relocated via towing. A column-stabilised unit consists of a deck box with six (or eight) supporting columns / silos that are attached to submerged pontoons. The Autonomous construction has two floating modulus of rectangular shape as a base, which keep the structure afloat. The compartments for the feed are the six steel welded columns (polypod legs) which act as silos. The internal walls of the columns are inclined at an angle of no more than 60 degrees to the horizontal.
The Engine Room is located above the Food Compartments / silos. Control Room with a feed control station is located above the Engine Room at bow of Engine Room Superstructure.
An additional tube-shape Pipe Room Compartment for the ballasting system is foreseen in CL in front of Main Diesel-generator. During the unloading (feeding) process, the stability of the structure improves. Nevertheless, FS should start taking ballast at a cargo (feed) quantity of 46% (Assuming a feed stock density of 650 kg/m3) to maintain the optimum position of the waterline and stability. In the Silos, no less than a 3-day Supply should be left in case of bad weather. This corresponds to about 15t of feed. In this state, the ballast tanks will be completely filled. The excess stability offered when the silos are empty facilitate towing of the Structure at sea.
The structure consists of separate blocks which also enables it to be transported in disassembled form. The structure can be separated in the following modules:
Pontoon block,
7 separate supports (6 Silo Compartment and the Pump Compartment)
ER Superstructure (deigned a one unit with platform).
The construction is going to be bolted by M30 bolts. Comer Silo Compartments are fitted to Pontoons by M30 studs. The capacity of Silo compartments ( assuming feed density of 650 kg/m3) is as follows:
Comer siloes (4 items) . 23.91 t (each)
Middle siloes (2 items) . 26.05 t (each)
The Stability of the construction can be secured in all main load conditions, including asymmetrical situations of feed arrangement in Silo Compartments through the use of water ballast. Common asymmetrical situations with propositions of water volumes in each ballast tank are taken into consideration.
The Engine Room (ER) has a separated Distribution Room in its fore part. The Distribution Room has an inclined wall in its fore part for fixing flexible hoses for feed distribution to the farms. Equipment located in the Engine Room includes:
Diesel-Generator,
Fuel tank 1 m3,
Air compressors,
Accumulator batteries,
Hoses with fittings for distribution loaded food to Compartments.
Hatch for feed inlet is located on side walls of ER, three in each side. The Grating platform is foreseen around ER. Waterproof door is located in aft wall of ER.
The Engine Room is designed as aluminum superstructure on steel framed deck. Access is provided from aft watertight door. Emergency exit is provided via watertight vertical hatch at aft wall of Control Room.
Industrial Applicability
Aquaculture is the most rapid expanding food industry in the world. The worlds demand for marine food supply has led to a major decline of wild fish stocks due to over fishing. This food gap of caught fish has and will be gradually replaced by aquaculture production. Historically, aquaculture has developed in near shore - sheltered, coastal environments referred to as inshore aquaculture. In the last decades marine aquaculture farms have explored the possibilities of moving offshore in areas where, environmental issues are less pronounced, conflicts with other coastal users are avoided and issues of space and farm size are less of a concern. A new trend of multifunctional uses of offshore platforms for a combination of activities such as simultaneous energy production and aquaculture in some regions of the world, are gaining popularity. Offshore aquaculture can allow operations from medium to large scale enterprises to develop with resulting economies of scale. Various studies show that the potential for marine fish farming will be in the order of 5 million tons per year3 by 2050. There is therefore great potential for structures that overcome the challenges of exposed environments, which will enable the development of fish farming in such areas.
Offshore aquaculture evokes many benefits but also has substantial risks associated with it. High installation costs, expensive feed transportation and risks to personnel working in unfavorable weather conditions are amongst the most obvious. Installations in open sea have to withstand substantial weather effects such as strong currents, high waves and swells which oblige aquaculture companies to make substantial investments in mooring facilities. Offshore - open sea aquaculture has thus evolved at a very slow rate and the risks involved with this type of business are substantial enough to discourage investment in development of real offshore farming.
In the last decades a new trend of multi-functional uses of offshore water for a combination of activities such as simultaneous energy production and aquaculture in some regions of the world are gaining popularity. All the offshore equipment such as cages that can be moored at any depth, submersible cages, large scale feed blower systems, large barges with huge feed carrying capacities and large storage units have all been developed.
A particular problem, which is directly related to this application for patent, is that the feeding structures that are necessary to support open sea offshore facilities have to have the ability to withstand heavy sea conditions, with high waves and simultaneously be able to have the capacity to feed and store large quantities of fish feed. The said invention offers increased stability of offshore fish farming operators thereby enabling the permanent installation of feeding platforms at aquaculture farms.
The most important aspect of the said invention offering significant operation and cost reduction advantages to aquaculture farming operations concerns the high autonomy of the feeding platforms which significantly reduces transport frequency and associated costs for feeding purposes. In particular, the invention enables the installation of high capacity feeding platforms at deep sea. In combination with the use of highly efficient, automated feeding systems, the invention offers high autonomy of feeding operations reaching up to several weeks. At the same time it incorporates remote controlled feeding capacities thereby minimizing the need to visit the platform to deploy permanent staff on site. The aforementioned advantages of the invention can significantly improve the cost effectiveness of deep sea aquaculture and is expected to contribute to the growth of the sector. A large number of existing deep sea aquaculture farms are also in need of and can benefit from installation of the platform.

Claims

1. A marine aquaculture platform structure suitable for deep sea, capable of withstanding high wave, high current environments: a. A marine structure that is characterised by a polypod design made of marine grade steel and offering minimum resistance and improved stability, be able to withstand as well as function in high wave and current environments.
The polypod is designed with either six or eight legs, depending on feed stock load requirements and weather conditions. The main material of the construction is steel category AH32, thickness 8 mm. The structure is calculated for a life of 20 years. The Engine Room Superstructure & Control Room are made of Aluminum alloys: 5083 Hi l l for plates and 6082 T6 for extruded bulb bars. The thickness of Superstructure plating is 5 mm. b. The technical specifications of the Polypod are customized based on marine environmental parameters of wave and current activity such that it is suited to and can withstand worst case environmental scenarios.
Construction was calculated with waive height up to 6m and wind up to 22 m/s (see structure calculation, DNV GL-OS-E301 (CH 2, SECTION 1 (2.3.4) waives, wind and current)). Construction can be customized based on marine environmental parameters of wave and current activity of the area in which polypod will be installed.
Scantling was done in accordance with DNVGL-OS-C101 "Design of offshore steel structures, general" (July 2015) Chapter 2 "Technical content" Section 4 "ULS" Paragraph 6 "Special provisions for plating and stiffeners", DNVGL-OS-C103 "Structural design of column stabilised units - LRFD method" (July 2015) Part 5 "Design pressure, design stresses, scantling determination" and
DNVGL-RU-OU-0503 "Rules for Classification of offshore fish farming units and installations". Basic data
Design category of craft: Offshore fish farming unit Extreme operational draught T E 7.13 (Full load WL)
Displacement (Full load), tons: D 309.12 Main spacing, m: si 0.60 s2 0.70
Vertical distance from the moulded BL to the underside of the deck structure, m: DD 10.27
Wave height, m: hw 6.00
Wind speed (10-minute mean wind speed U 10 at the height H = 10 m), m/s U 10 22.00 Wind speed values for some locations might be found in DNVGL-OS- E301 Ch.2 Sec.l [2.3.4]
2. A method for constructing the marine platform of claim 1, wherein said platform is customized to support deep sea aquaculture farming operations a. The platform is designed in accordance to client needs and is constructed by preparing prefabricated parts. Said parts are transported to a suitable location nearest intended operation site and then assembled, minimizing transportation costs (General Arrangement, Figs. 2-4,)
The construction consists of separate blocks to enable it to be transported in disassembled form. There are:
I. Pontoon block (Lower Section), (Fig. 5)
II. 7 separate supports (6 Silo Compartments and the Pump room Compartment) (Fig. 6)
III. ER Superstructure / control room (designed as one unit with platform). (Fig. 7)
The construction is going to be bolted by M30 bolts. Comer Silo Compartments are fitted to Pontoons by M30 studs.
3. A marine aquaculture platform capable of being transported from one deep sea to another deep sea location either by towing or by dismantling it in sets of prefabricated parts and transported via marine and / or land transportation means.
A base in the form of a polypod structure provides needed buoyancy, clearance from wave action and drag to enable its towing from land to a deep sea location.
The design features of the construction create excessive initial stability in empty condition, which allows for the polypod to be transported to a permanent parking place by towing, whereby:
Mooring area - offshore area, cage farm complex Depth in the mooring area is at least 8 m.
Wave height to 6 m Wind speed to 20 m/sec
Maximum static allowable heel after accidental flooding is 17° including wind.
The polypod is constructed to be secured at deep sea sites with high wave environments where the polypod secures adequate clearance to avoid wave action, minimises sea current drag and secures high stability in high wave environments. The polypod can be designed as needed to be suited to the wave activity of the project site.
• Depth in the mooring area is at least 8 m.
• Tested to a wave height of 6.00 m
• Wind speed (10-minute mean wind speed): U10 (at the height H = 10 m) is 22.00. Wind speed values for some locations might be found in DNVGL-OS- E301 Ch.2 Sec.l [2.3.4]
• Construction is designed to be permanently moored at operation site inside farming cell by anchoring
• Steel cables via eyes welded inside at lower corners of the construction.
• Foreseen 4 pairs of eyes in each comer of pontoons.
• Eyes designed for stud chain 22mm (Q1 ) with breaking load 200 kN or for cables with the corresponding characteristics for breaking loads.
Constructed to support aquaculture farming activities in deep sea environments.
Polypod is design to host operational and control equipment, including feed storage and distribution and remotely activated monitoring and control equipment
4. The method according to claim 1(a), wherein vertical parts of the said structure act as silos for fish feed and wherein fish feed is distributed to fish farms via tubular chain conveyors.
The vertical parts of the polypod act as silos and are equipped at the top with an air compressor and distributing mechanism for the feed. At the bottom the vertical parts / silos have an inclined diaphragm with a manhole for inspection. Inside each vertical part / silo there is a chain conveyor to feed the food up to the air compressor.
5. The method according to claim 2, wherein said modules are prepared in batches of prefabricated parts.
The construction consists of separate blocks to enable it to be transported in disassembled form. There are:
I. Pontoon block,
II. 7 separate supports (6 Silo Compartments and the Pump room Compartment)
III. ER Superstructure / control room (deigned a one unit with platform).
The construction is going to be bolted by M30 bolts. Comer Silo Compartments are fitted to Pontoons by M30 studs.
6. The method according to claim 2, wherein said prefabricated parts are transported to suitable land location for assembly and transported to final site of operation by towing with a configuration that minimizes drag and wave influences.
Construction unit is non-self-propelled autonomous Semi-Submersible Floating Structure that can be relocated. A column-stabilised unit consists of a deck box with six supporting columns that are attached to submerged pontoons.
Design type - column-stabilised unit.
7. The method according to claim 1 (a) wherein vertical parts of the polypod are designed to provide appropriate buoyancy for the platform as well as to serve as functional parts of the aquaculture farm including to act as silos for the storage of fish feed.
Construction carries 42 tons of permanent solid ballast (heavy cement) to ensure stability in full load. During the unloading (feeding) process, the stability improves. In reduced feed stock storage the structure (46% or lower) the structure takes ballast to maintain optimum stability and position of the waterline.
Construction incorporates a ballast water level control system to measure the water level in ballast tanks. Control of the level of feed in silos and the level of ballast in tanks is provided on monitors in the Control Room for continuous monitoring. The Construction has a ballast system in order to provide proper draught when unloaded.
8. The method according to claim 1(a) wherein two of the horizontal parts of the bottom side of the polypod are designed to provide high density weight for stabilising the structure and two of the horizontal parts of the bottom of the polypod are designed to act as ballasts.
The construction carries 42 tons of permanent solid ballast (heavy cement) to ensure stability in full load (two horizontal parts). It has also two float modules. Each float module is divided by transverse bulkheads into two ballast compartments, to be able to heat the structure with incomplete cargo, for better behavior on the agitated sea.
Water ballast compartments - 2 fore and 2 aft.. Access for inspection is provided via 4 manholes in the top plate. Two manholes are raised above the top plate of the compartment to provide access at sea condition with a minimum draught. And two manholes are available for inspection only on land.
Water ballast compartments are divided by longitudinal and transverse baffle bulkheads for reducing the effect of water on stability.
PCT/IB2019/000815 2019-09-19 2019-09-19 Polypod deep sea aquaculture farm WO2021053361A1 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
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CN113767872A (en) * 2021-09-23 2021-12-10 哈尔滨工程大学 Automatic feeding device suitable for deep sea net cage
CN113925007A (en) * 2021-10-29 2022-01-14 山东大学 Gravity type net cage design method based on balance weight and cable distribution evaluation
CN114503944A (en) * 2022-03-09 2022-05-17 山东辰升科技有限公司 Net cage for underwater aquaculture
CN115581212A (en) * 2022-09-09 2023-01-10 中国交通建设股份有限公司 Offshore aquaculture system and design method thereof
CN116295659A (en) * 2023-05-19 2023-06-23 自然资源部第二海洋研究所 Coral reef ecological environment monitoring device

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