CN107074327B - LNG carrier and method for manufacturing such an LNG carrier - Google Patents

LNG carrier and method for manufacturing such an LNG carrier Download PDF

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Publication number
CN107074327B
CN107074327B CN201580056137.1A CN201580056137A CN107074327B CN 107074327 B CN107074327 B CN 107074327B CN 201580056137 A CN201580056137 A CN 201580056137A CN 107074327 B CN107074327 B CN 107074327B
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China
Prior art keywords
lng
type
carrier
main deck
cargo holds
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CN201580056137.1A
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Chinese (zh)
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CN107074327A (en
Inventor
迈克尔·怀利
希德罗瑞斯·约翰尼斯·伯纳德瑞斯·布林克尔
博姆 威廉·柯内利斯·德
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Single Buoy Moorings Inc
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Single Buoy Moorings Inc
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Publication of CN107074327A publication Critical patent/CN107074327A/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 
    • 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 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/50—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
    • B63B21/507—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers with mooring turrets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B73/00—Building or assembling vessels or marine structures, e.g. hulls or offshore platforms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B2021/001—Mooring bars, yokes, or the like, e.g. comprising articulations on both ends
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J99/00—Subject matter not provided for in other groups of this subclass
    • B63J2099/001—Burning of transported goods, e.g. fuel, boil-off or refuse
    • B63J2099/003—Burning of transported goods, e.g. fuel, boil-off or refuse of cargo oil or fuel, or of boil-off gases, e.g. for propulsive purposes
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T70/00—Maritime or waterways transport
    • Y02T70/50—Measures to reduce greenhouse gas emissions related to the propulsion system

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)

Abstract

The LNG carrier is provided with a hull, a main deck, a plurality of cargo holds below the main deck, and LNG storage tanks. The first number of cargo holds is configured as main cargo holds, each of which comprises LNG storage tanks of a first type, which are arranged as spherical LNG tanks located in the hull, a portion of which spherical tanks protrude above the main deck. The second number of cargo holds is configured as secondary cargo holds, each of which does not have LNG storage tanks or includes a second type of LNG storage tank, which is not a spherical LNG tank and is fitted into the respective cargo hold. A first part of the area of the main deck above the secondary cargo holds is provided with processing equipment for LNG processing. If each second cargo hold is equipped with LNG storage tanks of a second type, a second portion of the area of the main deck above the secondary cargo hold is free of processing equipment and includes an open space with openings for accessing the LNG storage tanks of the second type in each secondary cargo hold.

Description

LNG carrier and method for manufacturing such an LNG carrier
Technical Field
The present invention relates to LNG carriers. The invention also relates to a method of manufacturing such an LNG carrier. Furthermore, the invention relates to a floating LNG plant.
Background
Floating LNG plants (plants), which are basically floating production, storage and offloading (FPSO) vessels for LNG, are commonly used by the offshore oil and gas industry for processing natural gas feed and storing Liquefied Natural Gas (LNG). FPSO vessels are designed to receive feed gas, including natural gas and other components, from nearby platforms or from subsea wells. The received feed gas is treated by on-board treatment equipment to separate the natural gas from other components, and then liquefied by cooling to cryogenic temperature and stored as liquefied natural gas in tanks on the FPSO until the liquid is transferred to an LNG carrier that transports it to a land terminal.
Typically, spherical storage tanks are used to store LNG on the FPSO. For example, such spherical tanks are known as morse-type (mos-type) tanks consisting of a spherical volume within a thermally insulated housing. However, the spherical shape of the storage tanks is inefficient in terms of space occupation and causes the tanks to protrude through the main deck, thereby rendering the deck unusable for other purposes, such as processing equipment. Thus, in FPSOs using spherical LNG tanks, there is a tradeoff between storage capacity and production capacity. The greater LNG storage capacity as described above cannot be achieved without significantly reducing the processing footprint of the table.
JP2011230550 discloses an LNG-FPSO system comprising on a floating body: a stage for generating liquefied gas from natural gas; a first tank; a second tank different from the first tank type. The LNG-FPSO system stores the liquefied gas generated in the work table into the first tank, and then transfers the liquefied gas from the first tank to the second tank, thereby reducing a half load period of the second tank compared to the first tank and reducing a possibility that the second tank is damaged due to sloshing. A can that may be damaged due to sloshing is used for the second can to reduce damage due to sloshing.
It is an object of the present invention to overcome one or more of the disadvantages of the prior art.
Disclosure of Invention
This object is achieved by an LNG carrier provided with a hull, a main deck, a number of cargo holds below the main deck and LNG storage tanks,
wherein,,
-the first number of cargo holds are configured as main cargo holds, each of which comprises LNG storage tanks of a first type, which are arranged as spherical LNG tanks located in the hull, and a portion of which protrudes above the main deck;
-the second number of cargo holds is configured as secondary cargo holds, each of which has no LNG storage tanks or comprises a second type of LNG storage tank, which is not a spherical LNG tank and which fits into the respective cargo hold;
the sum of the first number and the second number is equal to the plurality;
-a first part of the area of the main deck above the secondary cargo hold is provided with processing equipment for LNG processing;
and if each second cargo hold is equipped with LNG storage tanks of a second type, a second portion of the area of the main deck above the secondary cargo hold is free of processing equipment and comprises an open space with openings for access to the LNG storage tanks of the second type in each secondary cargo hold.
The present invention has an advantage in that the ratio of the space required for the processing equipment to the space for the LNG storage volume on the LNG carrier can be optimized by arranging the second non-spherical LNG storage tanks in some number of cargo tanks and installing the spherical LNG storage tanks in other cargo tanks. The arrangement of LNG tanks of the second type in the cargo hold frees up deck space that is now available for processing equipment. Additionally, by providing an open space in the processing equipment and having an opening in the main deck above the LNG storage tanks of the second type, tools such as pumping equipment can be utilized to access the LNG storage tanks of the second type and/or for maintenance purposes.
According to an aspect, the invention relates to an LNG carrier as described above, wherein above each secondary cargo hold the main deck is arranged as a reinforced deck, the reinforcement being arranged in accordance with the load of the processing equipment on the main deck.
According to one aspect, the invention relates to an LNG carrier as described above, wherein the third section of the main deck above the one or more secondary cargo holds remains free of handling equipment.
According to an aspect, the invention relates to an LNG carrier as described above, wherein the LNG carrier comprises a crane at a second portion of the main deck area above the secondary cargo hold, the crane being arranged to transfer LNG pumping means to/from LNG storage tanks of the second type through the opening.
According to an aspect, the present invention relates to an LNG carrier as described above, wherein the weight of the LNG storage tanks of the second type and the weight of the processing equipment located above each LNG storage tank of the second type are equal to or less than the weight of the LNG storage tanks of the first type.
According to one aspect, the invention relates to an LNG carrier as described above, wherein the payload of the LNG storage tanks of the second type is smaller than the payload of the LNG storage tanks of the first type.
According to an aspect, the invention relates to an LNG carrier as described above, wherein the second type of tank is a tank type selected from the group consisting of prismatic tanks, cylindrical tanks, biconvex cylindrical tanks.
According to one aspect, the invention relates to an LNG carrier as described above, wherein the LNG carrier is provided with a sponson alongside the hull.
Furthermore, the invention relates to a floating LNG plant comprising a first LNG carrier, a second LNG carrier, a connection structure and a mooring system for mooring the floating LNG plant to the seabed;
the connection structure is arranged for connecting a side wall of a hull of a first LNG-carrier with a side wall of a hull of a second LNG-carrier to bring the hulls adjacent to each other with the connection structure between the respective hulls, whereby a catamaran is obtained, wherein at least the first LNG-carrier is an LNG-carrier as described above.
According to one aspect, the invention relates to a floating LNG plant as described above, wherein the mooring system is provided with a turntable allowing the floating LNG plant to function as a weathervane.
According to one aspect, the invention relates to a floating LNG carrier as described above, wherein the turret is positioned outside each of the hulls of the first and second LNG carriers.
According to one aspect, the invention relates to a floating LNG carrier as described above, wherein the connection structure comprises a sponson located alongside the hull of the first LNG carrier.
According to one aspect, the invention relates to a floating LNG carrier as described above, wherein the connection structure comprises a closed tank structure between the first and said second LNG carrier.
According to one aspect, the invention relates to a floating LNG carrier as described above, wherein the connection structure provides additional deck space between the hulls of the first and second LNG carriers, and wherein another part of the processing equipment is mounted on the additional deck space provided by the connection structure.
According to one aspect, the invention relates to a floating LNG plant as described above, wherein the processing plant for LNG processing comprises means for liquefying natural gas.
Furthermore, the present invention relates to a method for manufacturing an LNG carrier provided with a hull, a main deck, a plurality of cargo holds below the main deck and LNG storage tanks, the method comprising:
-providing a prefabricated LNG carrier provided with a plurality of LNG storage tanks of a first type in a corresponding number of cargo tanks, the LNG storage tanks of the first type being spherical LNG tanks arranged in the hull and a portion of the spherical tanks protruding above said main deck;
-removing LNG storage tanks of the first type from the second number of cargo holds and the main deck being adjacent to the removed LNG storage tanks of the first type, the second number being smaller than the plurality, such that the first number of LNG storage tanks of the first type is still present;
-installing a second type of LNG storage tank, which is not a spherical LNG tank, in one or more of the second number of cargo tanks;
-creating and reinforcing a main deck located above the secondary cargo holds;
-installing a treatment facility for LNG treatment on a first part of the main deck area on the secondary cargo hold, a second part of the main deck area having no treatment facility, and
-if a second type of LNG storage tank has been installed in each secondary cargo hold, providing an open space with openings in a second portion of the main deck area above the second type of LNG storage tank for accessing the second type of LNG storage tank.
According to one aspect, the invention relates to a method as described above, wherein removing LNG storage tanks of the first type from the second number of cargo holds comprises the step of maintaining transverse bulkheads of the respective cargo holds.
According to one aspect, the invention relates to a method as described above, wherein installing the LNG storage tanks of the second type in one of the second number of cargo holds comprises fitting the LNG storage tanks of the second type between existing transverse bulkheads of the respective cargo holds.
According to an aspect, the invention relates to a method as described above, wherein installing LNG storage tanks of the second type comprises installing stiffeners in the secondary cargo tanks.
According to one aspect, the invention relates to a method as described above, comprising the step of coupling an LNG carrier with a second LNG carrier via a connection structure,
the connection structure is arranged for connecting the side walls of the hulls of the first LNG-carrier with the side walls of the hulls of the second LNG-carrier so that the hulls are adjacent to each other with the connection structure between said respective hulls, whereby a catamaran is obtained.
According to one aspect, the invention relates to a method as described above, wherein the second LNG carrier is manufactured according to the above method.
Advantageous embodiments are further defined by the dependent claims.
Drawings
The invention will be explained in more detail below with reference to the drawings, in which illustrative embodiments of the invention are shown.
Fig. 1 shows a side view of an LNG carrier according to the present invention;
fig. 2 shows a top view of an LNG carrier according to an embodiment of the present invention;
fig. 3 shows a cross section of the hull of the LNG carrier of fig. 1 over a secondary cargo hold;
fig. 4 shows a top view of a floating LNG plant 1 according to an embodiment of the invention.
Detailed Description
Fig. 1 shows a side view of an LNG carrier 10 according to an embodiment of the present invention.
The LNG carrier 10 includes a hull 14 and a main deck 16.
The LNG carrier 10 is also provided with storage capacity for LNG by means of a plurality of LNG tanks 20, 22. LNG tanks 20, 22 are installed in the cargo holds of each of the transport vessels.
The plurality of LNG tanks includes one or more LNG tanks 20 of a first spherical type, which are arranged in a cargo tank C1 (denoted as a main cargo tank) within the hull 14 of the LNG carrier 10. The spherical LNG tank 20 is sized in such a way that a portion of the sphere protrudes above the main deck 16.
According to the prior art, spherical LNG tanks are called morse LNG tanks.
According to the present invention, the LNG carrier 10 further comprises one or more second non-spherical LNG tanks 22 in one or more of the remaining cargo tanks C2 (denoted as secondary cargo tanks) of the LNG carrier 10.
The LNG tanks 22 of the second type are fitted into secondary cargo holds located below a portion of the main deck 16 such that each secondary cargo hold, which is equipped with or without LNG tanks 22 of the second type, is substantially covered with the main deck 16.
In this way, the portion of the main deck 16 above each secondary cargo hold is substantially free and available as space for installing processing equipment for LNG processing. The handling equipment provides LNG carriers with production capacity for LNG and is schematically shown by blocks 24, 26.
The arrangement and number of installed LNG storage tanks of the second type are determined on the one hand by the required deck space for the LNG handling equipment and on the other hand by the weight of the LNG storage tanks of the second type and the weight of the handling equipment, so that insufficient buoyancy of the LNG carrier 10 is avoided.
Additionally, the weight of the payload of the second type of LNG storage tank and the weight of the payload of the first type of LNG spherical storage tank should be considered.
In the case of converting a prefabricated LNG carrier 10 using only a plurality of LNG spherical tanks 20 of the first type, which conversion involves removing and replacing one or more LNG storage tanks 20 of the first type, the weight of the processing equipment 24, 26 installed above one cargo hold C2 and, if installed in a second cargo hold, the weight of the LNG storage tanks 22 of the second type plus the payload should not exceed the weight and payload of a single LNG spherical storage tank 20 of the first type.
Furthermore, the main deck 16 on which the treatment devices are mounted is suitably reinforced in accordance with the weight of the treatment devices 24, 26.
Fig. 2 shows a schematic top view of the LNG carrier 10 according to fig. 1.
The LNG storage tanks 22 of the second type are mounted between bulkheads 28 adjacent to the respective cargo tanks C2.
According to this embodiment, the area above the second type of LNG storage tank 22 is not fully occupied by the processing equipment 24, but rather includes an open space 30 having openings for accessing the second type of LNG storage tank 22 below the main deck 16.
It should be noted that the treatment equipment 26 occupying the main deck area above the secondary cargo hold C2 without the second type of LNG storage tanks may cover the entire area or may also have an open space.
Such an opening 30 in the main deck 16 is configured to enable passage of LNG pumping devices (not shown) therethrough to/from LNG storage tanks of the second type.
The open space 30 on the main deck 16 is arranged to be accessed by a crane (not shown) that can transfer LNG pumping devices through the opening.
In the illustrated embodiment, the open space 30 on the main deck 16 extends in a longitudinal direction above the secondary cargo hold C2. This allows the crane to be manoeuvrable in that direction.
Alternatively, the open space 30 may extend in the transverse direction of the ship.
Optionally, the LNG carrier 10 is provided with a sponson 34 alongside the hull 14. The use of sponsons provides additional deck space for the processing equipment.
In an embodiment, the processing equipment 24, 26 includes a liquefaction system for liquefying feed gas from a gas source (not shown).
In an embodiment, the LNG carrier 10 is provided with a mooring system for mooring the ship at a given offshore location.
In a further embodiment, the mooring system is provided with a turret system for coupling with a mooring buoy (not shown) in such a way that the LNG carrier can act as a weathervane.
Fig. 3 shows a cross section of the hull 14 of the LNG carrier 10 of fig. 1 over the secondary cargo tank C2 holding the second type of LNG storage tank 22.
In this exemplary embodiment, a prismatic LNG storage tank is installed in the secondary cargo tank C2. The prismatic LNG storage tanks are positioned such that the bottom is located on the floor 41 of the cargo hold between the corner brackets 42, 43 and such that the side walls of the storage tanks are adjacent to the side walls 44, 45 of the hull 14.
Above the main deck 16, the treatment facilities 24, 26 are fitted with an intermediate open space 30 above an access opening 32 in the secondary cargo hold C2.
In an embodiment, instead of prismatic LNG storage tanks, the second type of LNG storage tank 22 may be, for example, one of a cylindrical tank or a biconvex cylindrical tank.
In an embodiment, the second type of LNG storage tank is provided with a vaporization dome (not shown) in the top of the storage tank having an outlet (not shown) located outside the secondary cargo hold C2 above the main deck 16.
In an embodiment, the gas vaporization may be supplied to the processing equipment 24, 26, for example, to a heat exchanger, a gas compressor, or a gas engine (not shown).
Fig. 4 shows a top view of a floating LNG plant 1 according to an embodiment of the invention.
The floating LNG carrier 1 comprises a first and a second LNG carrier 10, 11 and a connection structure 12.
The first and second LNG carriers, each comprising a hull 14 and a main deck 16, are arranged to lie alongside each other and to be coupled alongside each other by means of a connection structure 12. The connection structure 12 extends between the LNG carriers 10, 11 in the longitudinal direction of the ship.
At least one of the LNG carriers 10, 11 also has storage capacity for LNG by means of the first type of LNG storage tank 20 and the second type of LNG storage tank 22 as described above with reference to fig. 1 to 3. As mentioned above, the processing equipment located on the LNG carrier provides the capability for LNG production.
The LNG tanks 20, 22 are installed in the cargo hold C1 of the transport ship; c2, as explained above.
In an embodiment, the floating LNG plant 1 is provided with a mooring system 18 for mooring the floating LNG plant at a given offshore location.
In another embodiment, the mooring system 18 is provided with a turret system for coupling with a mooring buoy (not shown) in such a way that the floating LNG deck can act as a weathervane.
In yet another embodiment, the mooring buoy comprises one or more risers (not shown) coupled to a subsea well or gas source, and the mooring system 18 is arranged to couple the risers to the handling equipment 24, 26 on the floating LNG carrier 1.
The connection structure 12 between the hulls of the first and second LNG carriers may be one of a sponson configuration 34 and a closed box configuration.
The invention also relates to a method for manufacturing an LNG carrier 10 or a floating LNG carrier 1 as described above.
The method comprises newly creating an LNG carrier 10 or a floating LNG carrier 1 and converting an existing floating LNG carrier or an existing LNG carrier 10 provided with spherical LNG storage tanks 20; 11.
in the newly built floating LNG plant 1, i.e., based on the newly built LNG carrier 10, the first and second types of LNG storage tanks 20 are stored as needed; 22 are arranged on the LNG carrier 10 or on at least one of the LNG carriers 10, 11 constituting the floating LNG carrier 1 according to the invention.
During the conversion, the existing LNG carrier 10 or the existing floating LNG plant 1 (or the floating LNG plant to be built from the existing LNG carrier) is converted by: removing one or more LNG storage tanks 20 of the first type from the cargo hold C1 in the hull 14 of the LNG carrier 10, 11; the cargo hold is then modified as a secondary cargo hold C2 to accommodate one or more LNG storage tanks 22 of a second type; and then installing the second type of LNG storage tank 22 in the rebuilt secondary cargo tank C2.
At the location of the secondary cargo hold C2, the reinforced main deck 16 is created and arranged with processing equipment 24, 28 for LNG processing.
In an embodiment, at this location, an additional treatment deck is arranged above the main deck 16 for accommodating treatment equipment.
According to one aspect, a method for manufacturing a floating LNG carrier 1 comprising an LNG carrier 10, a second LNG carrier 11, a connection structure 12 and a mooring system 18 for mooring the floating LNG carrier to the seabed, comprises the steps, wherein each of the LNG carriers 10, 11 is provided with a hull 14, a main deck 16, cargo holds C1, C2 located below the main deck 16 and one or more spherical LNG storage tanks 20 of a first type arranged within the respective hull and having a portion of the spherical tanks protruding above the main deck,
connecting the outer side wall of the hull 14 of the LNG carrier 10 with the outer side wall of the hull 14 of the second LNG carrier 11 such that the hulls are adjacent to each other with the connection structure 12 between the respective hulls, thereby creating a catamaran;
providing at least the LNG carrier 10 in at least one secondary cargo hold C2 below a portion of the main deck 16 having one or more LNG storage tanks 22 of a second type, wherein the LNG storage tanks 22 of the second type are not spherical LNG storage tanks, and
on board the vessel are installed process equipment 24, 26 for LNG handling, the floating LNG carrier 1 being arranged at least on the main deck 16 of the LNG carrier 10, wherein at least a part of the handling equipment is arranged above a part of the main deck above the secondary cargo hold C2 holding the LNG storage tanks 22 of the second type.
The invention may be further defined according to the following clauses:
clause 1.LNG carrier, provided with a hull, a main deck, a plurality of cargo holds below the main deck and LNG storage tanks,
wherein-the first number of cargo holds are configured as main cargo holds, each of which comprises LNG storage tanks of a first type, which are arranged as spherical LNG tanks located in the hull, a portion of which spherical tanks protrude above the main deck;
-the second number of cargo holds is configured as secondary cargo holds, each of which has no LNG storage tanks or comprises a second type of LNG storage tank, which is not a spherical LNG tank and which fits into the respective cargo hold;
the sum of the first number and the second number is equal to the plurality;
-a first part of the area of the main deck above the secondary cargo hold is provided with processing equipment for LNG processing;
and if each second cargo hold is equipped with LNG storage tanks of a second type, a second portion of the area of the main deck above the secondary cargo hold is free of processing equipment and includes openings for accessing the LNG storage tanks of the second type in each secondary cargo hold.
Clause 2. The LNG carrier according to clause 1, wherein above each secondary cargo hold, the main deck is arranged to strengthen the deck, the strengthening being arranged in accordance with the load of the handling equipment on the main deck.
Clause 3. The LNG carrier of clause 1 or clause 2, wherein the third portion of the main deck above the one or more secondary cargo holds remains free of processing equipment.
Clause 4. The LNG carrier according to any of the preceding clauses 1-3, wherein the LNG carrier comprises a crane at the second portion of the main deck area above the secondary cargo hold, the crane being arranged to transfer LNG pumping devices to/from LNG storage tanks of the second type through the opening.
Clause 5. The LNG carrier of any of clauses 1 to 4, wherein the weight of the second type of LNG storage tanks and the weight of the processing equipment located above each of the second type of LNG storage tanks is equal to or less than the weight of the first type of LNG storage tanks.
Clause 6. The LNG carrier of clause 5, wherein the payload of the second type of LNG storage tank is smaller than the payload of the first type of LNG storage tank.
Clause 7. The LNG carrier of any of the preceding clauses 1-6, wherein the second type of tank is a tank type selected from the group consisting of prismatic tanks, cylindrical tanks, biconvex cylindrical tanks.
Clause 8. The LNG carrier according to any of the preceding clauses 1-7, wherein the LNG carrier is provided with a gangway alongside the hull.
Clause 9. A floating LNG carrier comprising a first LNG carrier, a second LNG carrier, a connection structure and a mooring system for mooring the floating LNG carrier to the seabed; the connection structure is arranged for connecting a side wall of a hull of the first LNG-carrier and a side wall of a hull of the second LNG-carrier to bring the hulls adjacent to each other with the connection structure between the respective hulls, whereby a catamaran is obtained, wherein at least the first LNG-carrier is an LNG-carrier according to any of the preceding clauses 1-8.
Clause 10. The floating LNG plant of clause 9, wherein the mooring system is provided with a turret that allows the floating LNG plant to function as a weathervaning.
Clause 11. The floating LNG carrier of clause 10, wherein a turret is positioned external to each of the hulls of the first and second LNG carriers.
Clause 12 the floating LNG carrier of clause 9, wherein the connection structure comprises a sponson located alongside the hull of the first LNG carrier.
Clause 13. The floating LNG carrier of clause 9, wherein the connection structure comprises a closed box structure between the first and second LNG carriers.
Clause 14. The floating LNG carrier according to clause 12 or clause 13, wherein the connection structure provides additional deck space between the hulls of the first and second LNG carriers, and wherein another portion of the processing equipment is mounted on the additional deck space provided by the connection structure.
Clause 15. The floating LNG plant of any of preceding clauses 9 to 14, wherein the process equipment for LNG processing comprises means for liquefying natural gas.
Clause 16. A method for manufacturing an LNG carrier provided with a hull, a main deck, a plurality of cargo holds below the main deck and LNG storage tanks, the method comprising:
-providing a prefabricated LNG carrier provided with a plurality of LNG storage tanks of a first type in a corresponding number of cargo holds, the LNG storage tanks of the first type being spherical LNG tanks arranged in the hull with a portion of the spherical tanks protruding above the main deck;
-removing the first type of LNG storage tanks from the second number of cargo holds and the main deck being adjacent to the removed first type of LNG storage tanks, the second number being smaller than the plurality, such that the first number of first type of LNG storage tanks remains;
-installing a second type of LNG storage tank, which is not a spherical LNG tank, in one or more of the second number of cargo tanks;
-creating and reinforcing a main deck located above the secondary cargo holds;
-installing a treatment facility for LNG treatment on a first part of the main deck area on the secondary cargo hold, a second part of the main deck area having no treatment facility, and
if a second type of LNG storage tank has been installed in each secondary cargo hold, an opening is provided in a second portion of the main deck area above the second type of LNG storage tank for accessing the second type of LNG storage tank.
Clause 17. The method of clause 16, wherein removing the first type of LNG storage tanks from the second number of cargo holds comprises the step of maintaining a transverse bulkhead of each cargo hold.
Clause 18 the method of clause 16 or 17, wherein installing the second type of LNG storage tank in one of the second number of cargo holds comprises fitting the second type of LNG storage tank between existing transverse bulkheads of each cargo hold.
Clause 19 the method of clause 18, wherein installing the second type of LNG storage tank comprises installing a stiffener in the secondary cargo hold.
Clause 20. The method according to any of clauses 16 to 19, comprising the step of combining the LNG carrier with the second LNG carrier by means of a connection structure, the connection structure being arranged for connecting the side walls of the hulls of the first LNG carrier with the side walls of the hulls of the second LNG carrier so as to bring the hulls adjacent to each other with the connection structure between the respective hulls, thereby obtaining a catamaran.
Clause 21. The method of clause 20, wherein the second LNG carrier is manufactured according to the method of any of clauses 16-19.
The invention has been described with reference to some embodiments. It will be appreciated by those skilled in the art that other alternative and equivalent embodiments of the invention can be devised and simplified for practice without departing from the present invention. It is intended that the invention be construed as including all such modifications and alterations insofar as they come within the scope of the appended claims.

Claims (19)

  1. An LNG carrier is provided with a hull, a main deck, a plurality of cargo holds below the main deck and LNG storage tanks,
    wherein,,
    -a first number of the cargo holds are configured as primary cargo holds, each of the primary cargo holds comprising a first type of LNG storage tank arranged as spherical LNG tanks within the hull, wherein a portion of the spherical LNG tanks protrudes above the main deck;
    -a second number of said cargo holds are configured as secondary cargo holds, each of said secondary cargo holds will not have LNG storage tanks or comprise a second type of LNG storage tank, which is not a spherical LNG tank, and which fits into each of said secondary cargo holds;
    the sum of the first number of the cargo holds and the second number of the cargo holds is equal to the plurality of cargo holds;
    -a first part of the area of the main deck above the secondary cargo hold is provided with processing equipment for LNG processing;
    -and if each of the secondary cargo holds is equipped with LNG storage tanks of a second type, a second part of the area of the main deck above the secondary cargo hold is free of handling equipment and an open space extending in a longitudinal or transverse direction above the secondary cargo hold is provided, which open space has an opening in the main deck for LNG pumping devices into the LNG storage tanks of the second type in each of the secondary cargo holds, wherein the LNG carrier comprises a crane at the second part of the main deck area above the secondary cargo hold, which crane is arranged for transferring the LNG pumping devices to and/or from the LNG storage tanks of the second type through the opening.
  2. 2. LNG carrier according to claim 1, wherein above each secondary cargo hold the main deck is arranged as a reinforcement deck, the reinforcement being arranged in accordance with the load of the processing equipment on the main deck.
  3. 3. LNG carrier according to any of the preceding claims 1-2, wherein the weight of the LNG storage tanks of the second type and the weight of the processing equipment located above each LNG storage tank of the second type are equal to or less than the weight of the LNG storage tanks of the first type.
  4. 4. LNG carrier according to claim 1 or 2, wherein the payload of the second type of LNG storage tank is smaller than the payload of the first type of LNG storage tank.
  5. 5. LNG carrier according to claim 1 or 2, wherein the LNG storage tanks of the second type are tank types selected from the group consisting of prismatic tanks, cylindrical tanks.
  6. 6. LNG carrier according to claim 1 or 2, wherein the LNG carrier is provided with a sponson alongside the hull.
  7. 7. A floating LNG carrier comprising a first LNG carrier, a second LNG carrier, a connection structure and a mooring system for mooring the floating LNG carrier to the seabed;
    the connection structure is arranged for connecting a side wall of a hull of the first LNG-carrier with a side wall of a hull of the second LNG-carrier, so that the hulls are adjacent to each other with the connection structure between the respective hulls, whereby a catamaran is obtained,
    wherein at least the first LNG carrier is an LNG carrier according to claim 1.
  8. 8. The floating LNG plant of claim 7, wherein the mooring system is provided with a turret that allows the floating LNG plant to function as a weathervane.
  9. 9. The floating LNG plant of claim 8, wherein the turret is positioned outside each of the hulls of the first and second LNG carriers.
  10. 10. The floating LNG plant of claim 7, wherein the connection structure comprises a sponson located alongside the hull of the first LNG carrier.
  11. 11. The floating LNG plant of claim 7, wherein the connection structure comprises a closed box structure located between the first LNG carrier and the second LNG carrier.
  12. 12. The floating LNG plant according to claim 10 or 11, wherein the connection structure provides additional deck space between the hulls of the first and second LNG carriers, and wherein another portion of the processing equipment is mounted on the additional deck space provided by the connection structure.
  13. 13. The floating LNG plant of claim 7, wherein the processing equipment for LNG processing comprises means for liquefaction of natural gas.
  14. 14. A method for manufacturing an LNG carrier provided with a hull, a main deck, a plurality of cargo holds below the main deck and LNG storage tanks, the method comprising:
    -providing a prefabricated LNG carrier provided with a plurality of LNG storage tanks of a first type in a corresponding number of cargo holds, the LNG storage tanks of the first type being spherical LNG tanks arranged within the hull and a portion of the spherical LNG tanks protruding above the main deck;
    -removing the first type of LNG storage tank and the main deck adjacent to the removed first type of LNG storage tank from a second number of secondary cargo holds of the cargo holds, the second number of secondary cargo holds being smaller than the plurality of cargo holds, such that a first number of first type of LNG storage tanks remains;
    -installing a second type of LNG storage tank in one or more of said secondary cargo holds that is not a spherical LNG tank;
    -creating and reinforcing a main deck located above said secondary cargo holds;
    -installing a treatment facility for LNG treatment on a first part of said main deck area on said secondary cargo hold, a second part of said main deck area being free of treatment facilities, and
    -if a second type of LNG storage tank has been installed in each secondary cargo hold, providing an open space with an opening in said second portion of said main deck area above said second type of LNG storage tank for LNG pumping means to enter said second type of LNG storage tank, said open space extending in a longitudinal or transverse direction above said secondary cargo hold,
    a crane is provided at the second portion of the main deck area above the secondary cargo holds, the crane being arranged for transferring the LNG pumping device to and/or from the second type of LNG storage tank through the opening.
  15. 15. The method of claim 14 wherein removing the first type of LNG storage tanks from the second number of the secondary cargo holds includes the step of maintaining a transverse bulkhead of the respective secondary cargo holds.
  16. 16. The method of claim 14 or 15, wherein installing the second type of LNG storage tank in one of the second number of secondary cargo holds comprises positioning the second type of LNG storage tank between existing transverse bulkheads of the respective secondary cargo holds.
  17. 17. The method of claim 16 wherein installing the second type of LNG storage tank comprises installing a stiffener in the secondary cargo tank.
  18. 18. The method of claim 14, comprising the step of coupling the LNG carrier with a second LNG carrier via a connection structure,
    the connection structure is arranged for connecting a side wall of the hull of the LNG-carrier with a side wall of the hull of the second LNG-carrier to bring the hulls adjacent to each other with the connection structure between the respective hulls, thereby obtaining a catamaran.
  19. 19. The method of claim 18, wherein the second LNG carrier is also manufactured according to the method of claim 14.
CN201580056137.1A 2014-10-08 2015-10-07 LNG carrier and method for manufacturing such an LNG carrier Active CN107074327B (en)

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KR20170083544A (en) 2017-07-18
KR102424475B1 (en) 2022-07-25

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