SG171756A1 - Device for floating production of lng and method for converting a lng-carrier to such a device - Google Patents

Device for floating production of lng and method for converting a lng-carrier to such a device Download PDF

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Publication number
SG171756A1
SG171756A1 SG2011036092A SG2011036092A SG171756A1 SG 171756 A1 SG171756 A1 SG 171756A1 SG 2011036092 A SG2011036092 A SG 2011036092A SG 2011036092 A SG2011036092 A SG 2011036092A SG 171756 A1 SG171756 A1 SG 171756A1
Authority
SG
Singapore
Prior art keywords
lng
hull
carrier
production system
hull structure
Prior art date
Application number
SG2011036092A
Inventor
Lars Sannes
Tor Skogan
Original Assignee
Moss Maritime As
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 Moss Maritime As filed Critical Moss Maritime As
Publication of SG171756A1 publication Critical patent/SG171756A1/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 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B83/00—Rebuilding or retrofitting vessels, e.g. retrofitting ballast water treatment systems
    • B63B83/20—Rebuilding or retrofitting vessels, e.g. retrofitting ballast water treatment systems for conversion to a different use, e.g. for converting tankers into a FPSO-FLNG units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0128—Shape spherical or elliptical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/05—Size
    • F17C2201/052—Size large (>1000 m3)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/05—Size
    • F17C2201/054—Size medium (>1 m3)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/01—Mounting arrangements
    • F17C2205/0103—Exterior arrangements
    • F17C2205/0119—Vessel walls form part of another structure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/22—Assembling processes
    • F17C2209/221—Welding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/012—Hydrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/033—Small pressure, e.g. for liquefied gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/01—Improving mechanical properties or manufacturing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0102—Applications for fluid transport or storage on or in the water
    • F17C2270/0105—Ships
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/32—Hydrogen storage

Abstract

The invention relates to a device for floating production of LNG. The device comprises a LNG carrier comprising a ship hull (12) and at least one spherical LNG storage tank (13) for storing LNG, a projecting hull structure (16) fixed to the ship hull (12), a LNG production system (17) for converting natural gas to LNG, where the LNG production system is arranged in the projecting hull structure (16) and means for transferring LNG from the LNG production system (17) to the at lest one spherical LNG storage tank (13). The invention also relates to a method for converting an LNG-carrier to a device for floating production of LNG.

Description

DEVICE FOR FLOATING PRODUCTION OF LNG AND METHOD FOR
CONVERTING A LNG-CARRIER TO SUCH A DEVICE
TECHNICAL FIELD
The present invention relates to a device for floating production of LNG and a method for converting an LNG-carrier to a device for floating production of LNG.
BACKGROUND
For transport of natural gas to distant markets the gas can be converted into LNG (Liquefied Natural Gas) and shipped at sea by means of LNG carriers. To date more than 280 LNG carriers have been built world wide. Due to the low temperature of the cargo (-163°C) the cargo containment system on an LNG carrier is a complex and costly installation. Over the years considerable efforts have been made by designers and shipyards to optimize the technology and reduce cost of the LNG carrier containment systems.
The LNG carrier market has been and still is completely dominated by two containment system designs; the Moss spherical tank and the membrane design.
In the recent years concepts have been proposed for creating floating LNG production units, often referred to as “an FLNG unit” or “an FLNG”. Such a unit is provided for offshore production of LNG. In comparison with LNG carrier designs the amount of equipment needed on an FLNG unit will be substantial. Since the ship hull and LNG storage tanks on an LNG carrier are optimized for transport of LNG, installation of LNG production equipment may be difficult or even impossible without significantly affecting the design of the ship hull and/or the LNG storage tanks. In response to this challenge FLNG concepts have been proposed with LNG storage tank designs being different from the dominating Moss and membrane designs. The construction of these alternative systems is associated with additional risks and costs compared to the dominating LNG carrier designs
The object of the present invention is hence to provide a system and method for floating production of LNG which can benefit directly from experience with LNG carriers. Moreover, the object of the present invention is to provide a method for converting an LNG-carrier to a device for floating production of LNG.
SUMMARY OF THE INVENTION
The present invention relates to a device for floating production of LNG, comprising:
- a LNG carrier comprising a ship hull and at least one spherical LNG storage tank for storing LNG; - a projecting hull structure fixed to the ship hull; - a LNG production system for converting natural gas to LNG, where the LNG production system is arranged in the projecting hull structure; - means for transferring LNG from the LNG production system to the at lest one spherical LNG storage tank.
In one aspect according to the invention, some elements of the LNG production system is arranged in the ship hull.
In one aspect according to the invention, the hull structure is fixed to the outer side surface of the hull of the LNG carrier.
In one aspect according to the invention, the ship hull and the hull structure is an integral structure.
In one aspect according to the invention, the hull structure is welded to the ship hull.
In one aspect according to the invention, an upper surface of the hull structure is substantially level with the main deck of the LNG-carrier.
In one aspect according to the invention, the hull structure is arranged above the water level of the ship hull.
In one aspect according to the invention, it comprises means for receiving natural gas from an external source and means for conveying the natural gas to the LNG production system.
In one aspect according to the invention, the hull structure is watertight.
In one aspect according to the invention, the hull structure comprises buoyancy compartments.
In one aspect according to the invention, the hull structure and the LNG production system are provided to be retrofitted to the LNG carrier.
The present invention also relates to method for converting an LNG-carrier to a device for floating production of LNG, where the LNG carrier is comprising a ship hull and at least one spherical LNG storage tank for storing LNG, wherein the method comprises the following steps: - providing the ship hull of the LNG-carrier with a protruding hull structure; - arranging an LNG production system in the protruding hull structure; - connecting the LNG production system to the at least one spherical LNG storage tank.
In one aspect according to the invention, the method comprises fixing the hull structure to the outer side surface of the ship hull. :
In one aspect according to the invention, the method comprises welding the hull structure to the ship hull.
In one aspect according to the invention, the method comprises retrofitting the hull structure and the LNG production system to the ship hull.
In one aspect according to the invention, the method comprises providing the hull structure above the waterline of the ship hull.
DETAILED DESCRIPTION
In the following reference will be made to the enclosed drawings, as follows:
Fig. 1 illustrates a plan view of a typical Moss type LNG carrier with four spherical
LNG tanks.
Fig. 2 illustrates a plan view of an FLNG unit based on the LNG carrier in fig. I.
Fig. 3a and 3b illustrate transverse sections of different embodiments of the FLNG unit.
Fig. 4 illustrates an alternative embodiment of fig. 2, also showing elements of the
LNG production system.
Fig. 1 illustrates the general arrangement of a typical Moss type LNG carrier 1. The
LNG carrier is used for storing of LNG. 1. The LNG carrier 1 comprises essentially a ship hull 2, in which spherical LNG storage tanks 3 are provided. The LNG carrier 1 is considered well known for a skilled person and will not be described in detail herein. In the embodiment shown in fig. 1, the LNG carrier 1 comprises four spherical LNG storage tanks 3.
It is now referred to fig. 2, illustrating the present invention as a device 11 for floating production of LNG (i.e. an FLNG). As in fig. 1, the device comprises an
LNG carrier comprising a ship hull 12 and at least one spherical LNG storage tank 13 for storing LNG.
The device 11 may be utilized as a more or less stationary floating unit anchored to the seabed or positioned by DP; where natural gas is converted to LNG on the device 11 and where the tanks 13 are used as temporary storage. In such use, the
LNG will be transported to the marked by means of other transport vessels that fills their LNG tanks from the tanks 13 of the device 11. However, the device 11 may also comprise a propulsion system 14 for transportation of the LNG.
The device or FLNG 11 further comprises a projecting hull structure 16 fixed to the ship hull 12. The projecting hull structure 16 is denoted a so-called sponson structure, which is a term used to describe structures that project from the side of a ship. The sponson structure 16 may be fixed to the outer side surface of the hull of the ship hull, for example, the sponson structure 16 may be welded to the ship hull 12. Hence, the sponson structure 16 is suitable for being retrofitted to an existing
LNG carrier.
The ship hull 12 and the sponson structure 16 may also be arranged as an integral structure, for example if the entire FLNG is built as a new structure.
As shown in fig. 2 and fig. 3a-b, the sponson structure 16 compriscs two structures, one sponson structure on each side (starboard and port side) of the ship hull 12.
As shown in fig. 3a and 3b, the upper deck of the sponson structure 16 may be at the same elevation as the main deck of the ship hull. In fig. 3a it is shown that the sponson structure 16 is arranged above the water level A of the ship hull 12.
Consequently, the sponson structure 16 may be retrofitted to an LNG carrier without the need for a dry dock during the retrofitting process.
However, it would also be possible to arrange the sponson structure 16 so that it is entirely or partially below the water level A, as indicated in fig. 3b.
The sponson structure 16 may be watertight. Hence, the sponson structure 16 contribute to the buoyancy and hydrostatic stability of the FLNG, when submerged in water.
It should be noted that the water level A in fig. 3a is indicated for a vessel where there is no LNG in the LNG storage tanks 13. When the tanks are loaded with LNG, the sponson structures 16 will normally be partially submerged in water and hence contribute to the buoyancy and hydrostatic stability mentioned above.
The device or FLNG 11 further comprises a LNG production system 17 for converting natural gas to LNG. The LNG production system 17 is arranged in the projecting hull structure 16. However, some elements of the LNG production system 17 may also be arranged in the ship hull 12, if suitable. It should be noted that the term “in” is used herein. However, a skilled person would know that the different elements of the LNG production system 17 may be located inside the hull structure 16, inside the ship hull 12, on the deck(s) of the hull structure 16 or the ship hull 12 etc or wherever it is suitable to provide such equipment.
The device or FLNG 11 further comprises means (not shown) for transferring LNG from the LNG production system 17 to the at lest one spherical LNG storage tank 13. Moreover, the device 11 may also comprise means for receiving natural gas from an external source and means for processing and conveying the natural gas to the LNG production system 17.
Since the hull structure 16 does not substantially affect the ship hull 12, LNG storage tanks etc, the hull structure 16 and the LNG production system 17 are well suitable to be retrofitted onto the LNG carrier.
It is now referred to fig. 4, where the different elements of the LNG production 5 system 17 are indicated with the following reference numbers: - 17a — 17b denote compressor modules - 17c denotes a gas pre-treatment module, for cleaning of the gas from the external source - 17d denotes a pipe rack - 17e denotes a liquefaction module for liquefying the gas - 17f denotes a cooling module for cooling purposes - 17g-17h denote yet a liquefaction module and cooling module respectively
These elements are considered well known for a skilled person, and will not be described further in detail here.
In the hull structure 16 there may also be provided void space(s), water ballast tank(s), or tank(s) for storage of hydrocarbon liquids etc. extracted by the LNG production system.
The sponson structures will now be described further in detail. The sponson structures are steel structures with stiffened shell plating and transverse frames/bulkheads, designed so they can be welded directly to the sides of the ship hull 12, which has only a minor impact on the design of the ship hull 12. The sponson structures may be designed and manufactured by use of conventional ship structure elements like steel plates and rolled/built profiles etc.
The scantling of the sponson structures shall be satisfactory for supporting the weights/loads from equipment installed on top of the sponsons, external sea pressures, internal tank liquid pressures etc. The sponson structures will also represent a significant increase of the overall longitudinal strength of the ship hull 12.
The top side of the sponson structures may be prepared as flat decks, which provides space and structural strength for installation of equipment. This is the primary purpose of the sponsons, but equally important the sponsons will provide additional hydrostatic stability of the vessel, when the sponsons are submerged in water, which is an important aspect given the significant weight and centre of gravity of the equipment associated with the LNG production.
The main dimensions of the sponsons will depend on several factors, like required space for the equipment to be installed on top of the sponsons, required hydrostatic stability contribution from the sponsons, possible requirements for using the interior of the sponsons as liquid hydrocarbon storage and/or ballast water tanks etc.
It is noticeable that the invention is equally attractive for newbuilds and conversions, since the sponson installation only has minimum impact on the design of the ship hull 12 and no impact on the design of the LNG storage tank 3. Hence the invention represents an opportunity for utilizing already existing LNG carriers as FLNG units.
The sponsons may be erected and fitted to the ship hull structure in a building dock at a shipyard. However, the sponsons may also be designed and shaped in the way that they can be fitted when the ship hull is floating alongside an outfitting quay.
The sponsons to be built in sections and lifted to final position by shore cranes or floating cranes. For simplification of the erection procedure the extension of the sponsons as far as possible is to be confined within the flat-of-side area of the main hull.
A method for converting an LNG-carrier to a device for floating production of LNG 1s also provided. As mentioned above, the LNG carrier is comprising a ship hull 12 and at least one spherical LNG storage tank 13for storing LNG. The method comprises the following steps: - providing the ship hull 12 of the LNG-carrier with a protruding hull structure 16; - arranging an LNG production system 17 in the protruding hull structure 16; - connecting the LNG production system 17 to the at least one spherical LNG storage tank 13.
The method may further comprise the step of fixing the hull structure 16 to the outer side surface of the ship hull 12.
The method may further comprise the step of welding the hull structure 16 to the ship hull 12.
The method may further comprise the step of retrofitting the hull structure 16 and the LNG production system 17 to the ship hull 12.
The method may further comprise the step of providing the hull structure 16 above the waterline of the ship hull 12.
Further modifications and variations will be obvious for a skilled man when reading the description above. The scope of the invention will appear from the following claims and their equivalents.

Claims (16)

1. Device for floating production of LNG, comprising: - a LNG carrier comprising a ship hull (12) and at least one spherical LNG storage tank (13) for storing LNG; - a projecting hull structure (16) fixed to the ship hull (12); - a LNG production system (17) for converting natural gas to LNG, where the LNG production system is arranged in the projecting hull structure (16); - means for transferring LNG from the LNG production system (17) to the at lest one spherical LNG storage tank (13).
2. Device according to claim 1, wherein some elements of the LNG production system (17) is arranged in the ship hull (12).
3. Device according to claim 1, wherein the hull structure (16) is fixed to the outer side surface of the hull of the LNG carrier.
4. Device according to claim 1, where the ship hull (12) and the hull structure (16) is an integral structure.
5. Device according to claim 1, wherein the hull structure (16) is welded to the ship hull (12).
6. Device according to claim I, wherein an upper surface of the hull structure is substantially level with the main deck of the LNG-carrier.
7. Device according to claim 1, wherein the hull structure (16) is arranged above the water level of the ship hull (12).
8. Device according to claim 1, wherein it comprises means for receiving natural gas from an external source and means for conveying the natural gas to the LNG production system (17).
9. Device according to claim 1, wherein the hull structure (16) is watertight.
10. Device according to claim 1, wherein the hull structure (16) comprises buoyancy compartments.
11. Device according to claim 1, wherein the hull structure (16) and the LNG production system (17) are provided to be retrofitted to the LNG carrier.
12. Method for converting an LNG-carrier to a device for floating production of LNG, where the LNG carrier is comprising a ship hull (12) and at least one spherical LNG storage tank (13) for storing LNG, wherein the method comprises the following steps: - providing the ship hull (12) of the LNG-carrier with a protruding hull structure
- arranging an LNG production system (17) in the protruding hull structure (16); - connecting the LNG production system (17) to the at least one spherical LNG storage tank (13).
13. Method according to claim 12, wherein the method comprises fixing the hull structure (16) to the outer side surface of the ship hull (12).
14. Method according to claim 12, wherein the method comprises welding the hull structure (16) to the ship hull (12).
15. Method according to claim 12, wherein the method comprises retrofitting the hull structure (16) and the LNG production system (17) to the ship hull (12).
16. Method according to claim 12, wherein the method comprises providing the hull structure (16) above the waterline of the ship hull (12).
SG2011036092A 2008-11-19 2009-10-28 Device for floating production of lng and method for converting a lng-carrier to such a device SG171756A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20084875A NO331660B1 (en) 2008-11-19 2008-11-19 Device for liquid production of LNG and method for converting an LNG ship to such device
PCT/NO2009/000376 WO2010059059A1 (en) 2008-11-19 2009-10-28 Device for floating production of lng and method for converting a lng-carrier to such a device

Publications (1)

Publication Number Publication Date
SG171756A1 true SG171756A1 (en) 2011-07-28

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Application Number Title Priority Date Filing Date
SG2011036092A SG171756A1 (en) 2008-11-19 2009-10-28 Device for floating production of lng and method for converting a lng-carrier to such a device

Country Status (4)

Country Link
CN (1) CN102216153B (en)
NO (1) NO331660B1 (en)
SG (1) SG171756A1 (en)
WO (1) WO2010059059A1 (en)

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US10196114B2 (en) 2015-05-13 2019-02-05 Crondall Energy Consultants Ltd. Floating production unit and method of installing a floating production unit

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Publication number Priority date Publication date Assignee Title
US8491350B2 (en) * 2010-05-27 2013-07-23 Helix Energy Solutions Group, Inc. Floating production unit with disconnectable transfer system
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