NL2014412B1 - Semi-submersible with improved removal of exhaust gasses from fuel engine. - Google Patents

Semi-submersible with improved removal of exhaust gasses from fuel engine. Download PDF

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Publication number
NL2014412B1
NL2014412B1 NL2014412A NL2014412A NL2014412B1 NL 2014412 B1 NL2014412 B1 NL 2014412B1 NL 2014412 A NL2014412 A NL 2014412A NL 2014412 A NL2014412 A NL 2014412A NL 2014412 B1 NL2014412 B1 NL 2014412B1
Authority
NL
Netherlands
Prior art keywords
semi
submersible
fuel engine
pontoon
exhaust gasses
Prior art date
Application number
NL2014412A
Other languages
Dutch (nl)
Inventor
Roodenburg Joop
Roman Abajo Adrian
Original Assignee
Itrec Bv
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Itrec Bv filed Critical Itrec Bv
Priority to NL2014412A priority Critical patent/NL2014412B1/en
Priority to PCT/NL2016/050151 priority patent/WO2016144163A1/en
Priority to CN201690000746.5U priority patent/CN208036540U/en
Application granted granted Critical
Publication of NL2014412B1 publication Critical patent/NL2014412B1/en

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Classifications

    • 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 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/004—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 specially adapted for marine propulsion, i.e. for receiving simultaneously engine exhaust gases and engine cooling water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/12—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 specially adapted for submerged exhausting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2340/00—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
    • F01N2590/02—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for marine vessels or naval applications
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
    • F01N2590/10—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for stationary applications

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Exhaust Silencers (AREA)

Abstract

The invention relates to a semi-submersible comprising: - a pontoon; - a deckbox arranged above the pontoon at a distance therefrom; - a structural column connecting the deckbox and the pontoon; and - a fuel engine; wherein the fuel engine is arranged inside the deckbox, wherein the semi-submersible further comprises a scrubber for cleaning exhaust gasses from the fuel engine, wherein the scrubber is arranged inside the structural column or in the pontoon, and wherein the semi­ submersible further comprises an internal tubing system connecting an output of the fuel engine for exhaust gasses to the scrubber and connecting an output of the scrubber to an opening in the outside of the semi-submersible.

Description

P32309N LOO/MVE
Title: Semi-submersible with improved removal of exhaust gasses from fuel engine
The invention relates to a semi-submersible comprising a pontoon, a deckbox arranged above the pontoon at a distance therefrom, a structural column connecting the deckbox and the pontoon, and a fuel engine to provide power to the semi-submersible by fuel combustion.
Such a semi-submersible is for instance known from international patent publication WO99/25607A1. In this disclosure, the fuel engine and corresponding fuel tanks are arranged in the pontoon. Ducting is provided through the structural column in order to provide air to the fuel engine for combustion and to remove exhaust gasses originating from the fuel engine. A drawback of the semi-submersible of WO99/25607A1 is that the fuel engines are located in the pontoon which make them difficult to reach for maintenance, replacement, etc. A further drawback of the fuel engines in the pontoon is that relatively long ducting is required to provide the air and to remove the exhaust gasses. Yet another drawback of the fuel engines in the pontoon is that in case of leakage in the pontoon, the fuel engines are the first equipment subjected to incoming water with immediate power loss as a consequence.
Another drawback of the semi-submersible of WO99/25607A1 is that the dirty exhaust gasses are outputted at or near the deckbox, which is not preferred from safety point of view as it may interfere with other equipment, and which is not preferred from health point of view.
An obvious solution would therefore be to arrange the fuel engines in the deck box and use a chimney extending above the deckbox to remove the dirty exhaust gasses. The chimney is required to obtain sufficient draught for the exhaust gasses and to output the exhaust gasses at a distance from the deckbox thereby reducing the risk of safety and health issues in the immediate surroundings of the semi-submersible.
However, a drawback of this obvious solution is that the chimney occupies valuable space above the deckbox and may interfere with equipment positioned on the deckbox, e.g. cranes.
It is therefore an object of the invention to provide a semi-submersible having an improved removal of dirty exhaust gasses from a fuel engine.
This object is achieved by a semi-submersible comprising: - a pontoon; - a deckbox arranged above the pontoon at a distance therefrom; - a structural column connecting the deckbox and the pontoon; and - a fuel engine; wherein the fuel engine is arranged inside the deckbox, wherein the semi-submersible further comprises a scrubber for cleaning exhaust gasses from the fuel engine, wherein the scrubber is arranged inside the structural column or in the pontoon, and wherein the semi-submersible further comprises an internal tubing system connecting an output of the fuel engine for exhaust gasses to the scrubber and connecting an output of the scrubber to an opening in the outside of the semi-submersible.
An advantage of the semi-submersible according to the invention is that a scrubber is used to clean the exhaust gasses from the fuel engine which obviates the reason to output the exhaust gasses at a distance from the deckbox as the cleaned exhaust gasses pose less problems with respect to safety and health. This means that large chimneys extending above the deckbox are no longer required for this reason.
Another advantage of the semi-submersible according to the invention is that the scrubber is arranged below the deckbox and thus below the fuel engine. Hence, the scrubber is placed in the semi-submersible at a location where it cannot interfere with the operation of the semi-submersible inside or on the deckbox. It further allows a relatively large duct or tube from the scrubber to the opening in the outside of the semi-submersible without having to extend above the deckbox. Hence, it may be possible to obtain sufficient draught in the tubing without extending above the deckbox and thus without interfering with operations on the deckbox.
In an embodiment, the opening in the outside of the semi-submersible is located in a top surface of the deckbox. In this way, the tubing system from scrubber to opening in the outside of the semi-submersible can be a vertical system resembling a chimney the most.
In an embodiment, the opening in the outside of the semi-submersible is located in a sidewall of the deckbox or in a sidewall of the structural column. This has the advantage that no exhaust gasses are outputted on the deckbox and thus do not interfere with other equipment nor occupy any space on the deckbox.
In an embodiment, the tubing system near the opening in the outside of the semi-submersible is provided with a venturi tube, preferably a de Laval nozzle. This allows to propel the exhaust gasses away from the semi-submersible.
In an embodiment, the tubing system connecting the output of the fuel engine to the scrubber comprises a damper. In this way, pressure differences originating from the fuel engine are dampened, so that the scrubber is less subjected to these pressure differences.
In an embodiment, the tubing system comprises air displacers to force the exhaust gasses through the tubing system. In this way, the draught of the tubing system is less relevant and thus the length of the tubing system can be reduced. This may allow to reduce the risk of interference between the tubing system and other equipment.
The invention also relates to a method for handling exhaust gasses on a semi-submersible comprising a pontoon, a deckbox arranged above the pontoon at a distance therefrom, a structural column connecting the deckbox and the pontoon, and a fuel engine outputting exhaust gasses, which fuel engine is arranged in the deckbox, said method comprising the following steps: a. directing exhaust gasses from the fuel engine to a scrubber, which scrubber is arranged inside the structural column or in the pontoon; b. cleaning the exhaust gasses while passing the scrubber by using the scrubber; and c. directing the cleaned exhaust gasses to an opening in the outside of the semi-submersible.
The invention will now be described in a non-limiting way by reference to the accompanying drawings, in which like parts are indicated by like reference symbols, and in which:
Fig. 1 depicts schematically a semi-submersible according to an embodiment of the invention;
Fig. 2 depicts schematically a cross sectional view at a structural column of a semi- submersible according to an embodiment of the invention; and
Fig. 3 depicts schematically a cross sectional view at a structural column of a semi- submersible according to another embodiment of the invention.
Fig. 1 depicts schematically a semi-submersible 1 according to an embodiment of the invention. The semi-submersible 1 comprises in this embodiment two pontoons 3, 4, and a deckbox 6 arranged above the pontoons 3, 4 at a distance therefrom. Each pontoon 3, 4 comprises a pair of structural columns 8 connecting the deckbox 6 to the respective pontoon 3, 4.
Other configurations with a different number of pontoons and a different number of structural columnsalso fall within the scope of the invention.
The pontoons 3, 4 provide the required buoyancy and are in use usually located below the water surface 10, which water surface is only shown near one of the structural columns 8 for simplicity reasons. As a consequence, the pontoons are less susceptible to wave action at the water surface and thus the semi-submersible is less affected by wave loadings than a normal ship. The structural columns preferably have a small cross sectional area to keep the influence of the waves to a minimum and support the deckbox high above the water surface 10, which is possible due to the good stability of the design. As a result, the deckbox is kept well away from the waves.
This makes the semi-submersible very suitable as offshore drilling rigs, safety vessels, oil production platforms and heavy lift cranes. As an example, a crane 12 and a drilling rig 14 are schematically depicted on the deckbox of the semi-submersible. However, other equipment such as a pipelaying towers, e.g. a J-lay tower or an S-lay tower, other cranes, and tubular handling devices for pipe and/or drilling tubulars may alternatively or additionally be provided on the deckbox.
In order to provide power to the semi-submersible, the semi-submersible comprises a fuel engine (not shown in Fig. 1) arranged inside the deckbox. A first configuration of how exhaust gasses outputted by the fuel engine can be handled is shown in Fig. 2.
Fig. 2 depicts a cross sectional view at a structural column 8 of a semi-submersible like the semi-submersible of Fig. 1. Shown are a fuel engine 16 with a fuel tank 18, both arranged inside the deck box 6. The semi-submersible comprises an internal tubing system connecting the fuel tank 18 to the fuel engine 16 schematically indicated by tube 20, and connecting an input of the fuel engine for air to an opening 22 in the outside of the semi-submersible, here schematically indicated by tube 24. Opening 22 may alternatively be referred to as an air inlet.
The semi-submersible further comprises a scrubber 26 for cleaning exhaust gasses, which scrubber is arranged in the structural column 8. Alternatively, the scrubber could be arranged in the pontoon.
The internal tubing system further connects an output of the fuel engine for exhaust gasses to the scrubber, here schematically indicated by tube 28, and connects an output of the scrubber to an opening 30 in the outside of the semi-submersible, here schematically indicated by tube 32. Opening 30 may alternatively be referred to as an exhaust outlet.
As shown in Fig. 1, a top surface 34 of the deck box 6, alternatively referred to as operating deck 34 of deck box 6, is free from any tubing for the removal of exhaust gasses from the fuel engine, so that equipment on the operating deck is not interfered with. As the exhaust gasses are cleaned by the scrubber, outputting the exhaust gasses at the operating deck is less of a problem. In case it is preferred, a small chimney may extend from the operating deck at opening 30, but the size may be much smaller than in prior art solutions as there is already a relatively long tube 32 below the operating deck extending to the scrubber in the structural column. A second configuration of how exhaust gasses outputted by the fuel engine can be handled is shown in Fig. 3.
Fig. 3 depicts a cross sectional view at a structural column 8 of a semi-submersible like the semi-submersible of Fig. 1. A fuel engine 16 with fuel tank 18 are arranged inside the deck box 6. The semi-submersible comprises an internal tubing system connecting the fuel tank 18 to the fuel engine 16 schematically indicated by tube 20, and connecting an input of the fuel engine for air to an opening 22 in the outside of the semi-submersible, here schematically indicated by tube 24.
In tube 24, an air displacer 38, e.g. a ventilator, is arranged to force air from outside to the fuel engine 16.
The internal tubing system further connects an output of the fuel engine for exhaust gasses to the scrubber via damper 36, here schematically indicated by tube 28a extending from the fuel engine to the damper and tube 28b extending from the damper to the scrubber, and connects an output of the scrubber to an opening 30 in the outside of the semi-submersible, here schematically indicated by tube 32.
The tubing 32 comprises an air displacer 40 to force the exhaust gasses from the scrubber to outside the semi-submersible, and a venturi tube portion 42 to propel the exhaust gasses through the opening 30. Preferably the venture tube portion is configured as a de Laval nozzle, so that the kinetic energy of the exhaust gasses may advantageously be increased, thereby even further propelling the exhaust gasses away from the semi-submersible.
In the embodiment of Fig. 3, the opening 22 is located in a sidewall 6a of the deckbox 6 and the opening 30 is located in a sidewall 8a of the structural column 8. This has the advantage over the embodiment of Fig. 2 that the top surface or operating deck 34 of the deck box is free from openings for the air inlet and output of exhaust gasses.
The skilled person will recognize that the position of the openings 22 and 30, and in the embodiment of Fig. 3 especially opening 30 is preferably chosen such that no water is able to enter the openings and thus preferably should be positioned well above the waterline.
It will further be envisaged that the openings 22 and/or 30 and/or the tubes 24 and 32 may be provided with integrity devices to prevent ingress of potentially explosive gasses and/or to ensure that water cannot enter the tubes.
Other configurations in which the openings 22 and 30 are both arranged in the side wall of the deckbox or are both arranged in the side wall of the structural column are also envisaged.

Claims (7)

1. Een semi-submersible omvattende: a. een ponton; b. een dekstructuur aangebracht boven het ponton op een afstand hiervan; c. een constructiekolom die de dekstructuur en het ponton verbindt; en d. een brandstofmotor; met het kenmerk, dat de brandstofmotor is aangebracht in de dekstructuur, dat de semi-submersible verder een gaswasser omvat voor het wassen van uitlaatgassen van de brandstofmotor, waarbij de gaswasser is aangebracht in de constructiekolom of in het ponton, en dat de semi-submersible verder een intern buizensysteem omvat dat een uitgang van de brandstofmotor voor uitlaatgassen verbindt met de gaswasser en een uitgang van de gaswasser verbindt met een opening in de buitenzijde van de semi-submersible.A semi-submersible comprising: a. A pontoon; b. a deck structure arranged above the pontoon at a distance therefrom; c. a construction column connecting the deck structure and the pontoon; and d. a fuel engine; characterized in that the fuel engine is arranged in the deck structure, the semi-submersible further comprises a gas washer for washing exhaust gases from the fuel engine, the gas washer being arranged in the construction column or in the pontoon, and in that the semi-submersible further comprises an internal pipe system connecting an outlet of the exhaust gas fuel engine to the gas washer and an outlet of the gas washer to an opening in the outside of the semi-submersible. 2. Een semi-submersible volgens conclusie 1, waarbij de opening in de buitenzijde van de semi-submersible is gelegen in een bovenoppervlak van de dekstructuur.A semi-submersible according to claim 1, wherein the opening in the outside of the semi-submersible is located in an upper surface of the cover structure. 3. Een semi-submersible volgens conclusie 1, waarbij de opening in de buitenzijde van de semi-submersible is gelegen in een zijwand van de dekstructuur of in een zijwand van de constructiekolom.A semi-submersible according to claim 1, wherein the opening in the outside of the semi-submersible is located in a side wall of the cover structure or in a side wall of the construction column. 4. Een semi-submersible volgens conclusie 1, waarbij het buizensysteem vlakbij de opening in de buitenzijde van de semi-submersible is voorzien van een venturibuis, bij voorkeur een de Laval nozzle.A semi-submersible according to claim 1, wherein the pipe system close to the opening in the outside of the semi-submersible is provided with a venturi tube, preferably a de Laval nozzle. 5. Een semi-submersible volgens conclusie 1, waarbij het buizensysteem dat de uitgang van de brandstofmotor verbindt met de gaswasser een demper omvat.A semi-submersible according to claim 1, wherein the pipe system connecting the output of the fuel engine to the gas washer comprises a damper. 6. Een semi-submersible volgens conclusie 1, waarbij het buizensysteem luchtverplaatsers omvat voor het door het buizensysteem verplaatsen van de uitlaatgassen.A semi-submersible according to claim 1, wherein the tube system comprises air displacers for displacing the exhaust gases through the tube system. 7. Een werkwijze voor het behandelen van uitlaatgassen op een semi-submersible omvattende een ponton, een dekstructuur aangebracht boven het ponton op een afstand hiervan, een constructiekolom die de dekstructuur en het ponton verbindt, en een brandstofmotor aangebracht in de dekstructuur, waarbij de werkwijze de volgende stappen omvat: a. het geleiden van uitlaatgassen van de brandstofmotor naar een gaswasser, waarbij de gaswasser is aangebracht in de constructiekolom of in het ponton; b. het wassen van de uitlaatgassen terwijl deze door de gaswasser heen gaan door middel van de gaswasser; en c. het geleiden van gewassen uitlaatgassen naar een opening in de buitenzijde van de semi-submersible.A method for treating exhaust gases on a semi-submersible comprising a pontoon, a deck structure arranged above the pontoon at a distance from it, a construction column connecting the deck structure and the pontoon, and a fuel engine mounted in the deck structure, the method comprises the following steps: a. guiding exhaust gases from the fuel engine to a gas washer, wherein the gas washer is arranged in the construction column or in the pontoon; b. washing the exhaust gases while passing through the gas washer by means of the gas washer; and c. guiding washed exhaust gases to an opening in the outside of the semi-submersible.
NL2014412A 2015-03-06 2015-03-06 Semi-submersible with improved removal of exhaust gasses from fuel engine. NL2014412B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
NL2014412A NL2014412B1 (en) 2015-03-06 2015-03-06 Semi-submersible with improved removal of exhaust gasses from fuel engine.
PCT/NL2016/050151 WO2016144163A1 (en) 2015-03-06 2016-03-04 Semi-submersible with improved removal of exhaust gasses from fuel engine
CN201690000746.5U CN208036540U (en) 2015-03-06 2016-03-04 Semi-submersible type submersible

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL2014412A NL2014412B1 (en) 2015-03-06 2015-03-06 Semi-submersible with improved removal of exhaust gasses from fuel engine.

Publications (1)

Publication Number Publication Date
NL2014412B1 true NL2014412B1 (en) 2016-10-13

Family

ID=52998060

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Application Number Title Priority Date Filing Date
NL2014412A NL2014412B1 (en) 2015-03-06 2015-03-06 Semi-submersible with improved removal of exhaust gasses from fuel engine.

Country Status (3)

Country Link
CN (1) CN208036540U (en)
NL (1) NL2014412B1 (en)
WO (1) WO2016144163A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2018472B1 (en) * 2017-03-06 2018-09-21 Itrec Bv Semi-submersible drilling vessel with a mud treatment and circulation system.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4471708A (en) * 1977-10-31 1984-09-18 Sedco, Inc. Self-propelled semi-submersible service vessel
US6209470B1 (en) * 1997-03-14 2001-04-03 Donald E. Burg Stable semi-submersible surface effect ship
EP1103458A1 (en) * 1999-11-26 2001-05-30 Yi-Jun Wu Sea-going vessel with a solid-waste incinerator
WO2009125050A1 (en) * 2008-04-09 2009-10-15 Wärtsilä Finland Oy Machinery arrangement for a marine vessel
US20120192777A1 (en) * 2011-02-01 2012-08-02 Stefano Brizzolara Watercraft device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9724064D0 (en) 1997-11-15 1998-01-14 Sofitech Nv Semi-submersible structure

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4471708A (en) * 1977-10-31 1984-09-18 Sedco, Inc. Self-propelled semi-submersible service vessel
US6209470B1 (en) * 1997-03-14 2001-04-03 Donald E. Burg Stable semi-submersible surface effect ship
EP1103458A1 (en) * 1999-11-26 2001-05-30 Yi-Jun Wu Sea-going vessel with a solid-waste incinerator
WO2009125050A1 (en) * 2008-04-09 2009-10-15 Wärtsilä Finland Oy Machinery arrangement for a marine vessel
US20120192777A1 (en) * 2011-02-01 2012-08-02 Stefano Brizzolara Watercraft device

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CN208036540U (en) 2018-11-02

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