NL2027095B1 - Liquefied Natural Gas Bunker Ship - Google Patents

Liquefied Natural Gas Bunker Ship Download PDF

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Publication number
NL2027095B1
NL2027095B1 NL2027095A NL2027095A NL2027095B1 NL 2027095 B1 NL2027095 B1 NL 2027095B1 NL 2027095 A NL2027095 A NL 2027095A NL 2027095 A NL2027095 A NL 2027095A NL 2027095 B1 NL2027095 B1 NL 2027095B1
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NL
Netherlands
Prior art keywords
pressure
liquefied gas
pressure tank
gas transport
transport vessel
Prior art date
Application number
NL2027095A
Other languages
Dutch (nl)
Inventor
Peter Van Leeuwen Edwin
Cornelis Adriaan De Jong Douwe
De Jonge Jasper
Original Assignee
Titan Lng B V
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Publication date
Application filed by Titan Lng B V filed Critical Titan Lng B V
Priority to NL2027095A priority Critical patent/NL2027095B1/en
Application granted granted Critical
Publication of NL2027095B1 publication Critical patent/NL2027095B1/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
    • B63B25/14—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed pressurised
    • 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
    • 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
    • F17C3/00—Vessels not under pressure
    • F17C3/02—Vessels not under pressure with provision for thermal insulation
    • F17C3/025—Bulk storage in barges or on ships
    • 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
    • F17C2201/0104—Shape cylindrical
    • F17C2201/0109—Shape cylindrical with exteriorly curved end-piece
    • 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
    • F17C2201/0147—Shape complex
    • F17C2201/0166—Shape complex divided in several chambers
    • 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
    • F17C2201/03—Orientation
    • F17C2201/035—Orientation with substantially horizontal main axis
    • 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
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0612—Wall structures
    • F17C2203/0614—Single wall
    • 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
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0612—Wall structures
    • F17C2203/0626—Multiple walls
    • F17C2203/0629—Two walls
    • 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
    • F17C2221/011—Oxygen
    • 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
    • F17C2221/014—Nitrogen
    • 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
    • F17C2221/016—Noble gases (Ar, Kr, Xe)
    • F17C2221/017—Helium
    • 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
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/035—Propane butane, e.g. LPG, GPL
    • 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
    • F17C2260/013—Reducing manufacturing time or effort
    • 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

Abstract

Liquefied gas transport ship comprising at least one pressure tank for holding liquefied gas, wherein said pressure tank comprises an internal volume and wherein said pressure tank is formed by a closed circumferential wall that is closed off at both, opposite, ends by a respective end cap, wherein said circumferential wall is formed from at least two hollow cylindrical sectors having an angle of at least 180° that are arranged substantially parallel with respect to each other, and wherein said pressure tank comprises an internal wall arrangement for separating the internal volume in at least two separated pressure compartments.

Description

Liquefied Natural Gas Bunker Ship Bunkering refers to the process of supplying of fuel for use by ships. In the recent decades, most vessels used fuel oils for running its combustion engines. However, due to high pollution caused by (heavy) fuel oils, modern vessels tend to be powered by liquefied natural gas (LNG), as this significantly reduces the toxic pollution of ships. With strong growth expectations for the number of vessels that will be using the bunkering industry is moving to expand its LNG operations. This requires the use of bunker ships for supplying, for instance, large see going ships, such as containerships and/or bulk carriers. Liquefied natural gas (LNG) is a flammable gas that, when stored in a compressed and liquefied form, is also explosive. Current safety regulations (in for instance the European Union) therefore, limit the capacity of the pressurized and/or cryogenic tanks for storing LNG to 1000 m’ for vessels transporting LNG over inland waterways. Increasing the size of LNG bunker ships (i.e. vessels) thereby requires one to increase the number of tanks on board of the LNG bunker ship, thereby significantly increasing the length and size of the ships. This reduces the economy-of-scale benefits of the larger bunker ships. The goal of the current invention is to provide for an improved liquefied gas transport ship, wherein an increase of the economy-of-scale effect for a larger bunker ships is obtained. In a first aspect, the invention relates to a liquefied gas transport ship comprising at least one pressure tank for holding liquefied gas, wherein said pressure tank comprises an internal volume and wherein said pressure tank is formed by a closed circumferential wall that is closed off at both, opposite, ends by a respective end cap, wherein, preferably, said circumferential wall is formed from at least two hollow cylindrical sectors having an angle of at least 180° that are arranged substantially parallel with respect to each other, and wherein said pressure tank comprises an internal wall arrangement for separating the internal volume in at least two separated pressure compartments.
Such a ship can be used for storing and transporting liquefied gasses, such as liquefied air, liquefied oxygen, liquefied helium, liquefied nitrogen, liquefied natural gas (LNG) or liquefied petroleum gas (LPG). It is further noted that the invention can be applied to store and transport all types of gasses and liquids that need to be stored under pressure.
Preferably, the respective central axes of the at least two hollow cylindrical sectors are arranged substantially parallel with respect to each other, and wherein preferably respective longitudinal edges of the hollow cylindrical sectors are connected to each other, for forming a closed circumferential wall of the pressure tank.
By providing such a pressure tank with at least two separated pressure compartments, the total internal volume of the pressure tank may be larger than the 1000 nr’, while allowing the individual, separated pressure compartments to still have a volume that is 1000 m’ or less, such that the safety regulations are still met. Such a segmented pressure tank enables to improve the economy-of-scale, as the ratio of the internal volume of the tank with respect to the amount (and/or weight) of material (i.e. steel) used for constructing the pressure tank is improved. Hence, one requires less material to obtain a certain internal volume of the tank. This also improves the insulation characteristics of a tank, as the total outer surface area of the pressure tanks can be reduced with respect to the internal volume of the pressure tanks, such that they have a lower area-to-volume {5 ratio. Hereby, the surface area over which heat transfer occurs is effectively reduced (reduced with respect to the internal volume). The pressure compartments are preferably equal in volume, such that this effect can be maximized. Also in terms of required space, the pressure tank according to the invention is compacter when compared to separate smaller pressure tanks. Hereby, the size of the ship, in particular the length, can be reduced, such that the ship itself also requires less steel to build. In order to be able to withstand the relatively high internal pressure, pressure tanks are typically substantially cylindrically or spherically shaped. It is noted that the pressure tank according to the invention may have all different types of cylindrical shapes, such as a circular cylinder, an elliptic cylinder, a parabolic cylinder or a hyperbolic cylinder. The pressure tanks according to the invention can, however, have any shape as long as the pressure tank is suitable for coping with the internal pressures resulting from storing liquefied gasses, such as liquefied air, liquefied oxygen, liquefied helium, liquefied nitrogen, liquefied natural gas (LNG) or liquefied petroleum gas (LPG).
Preferably, said internal wall arrangement comprises a transversely oriented bulkhead that is arranged substantially perpendicular to a longitudinal axis of the hollow cylindrical sector. Hereby, the pressure tank is effectively separated, in the longitudinal direction, in two distinct pressure compartments.
In a preferred embodiment, said internal wall arrangement comprises a longitudinally oriented bulkhead that is arranged substantially parallel to a longitudinal axis of the hollow cylindrical sector. Hereby, the pressure tank is effectively separated, in the transverse direction, in two distinct pressure compartments.
Preferably, said end cap comprises a spherically shaped head, preferably a tori-spherical head. A spherically shaped head, and in particular a tori-spherical head, leads to an evenly distribution of stresses through the material of the head, wherein the head is furthermore relatively easy to manufacture.
In a preferred embodiment, the internal wall arrangement is a pressure resistant internal wall arrangement, such that the respective pressure compartments are arranged to be individually pressurized. Hereby, a failure, such a leakage and/or sudden rupture in a wall of a first compartment, can be isolated from the other pressure compartments. This increases the safety of the pressure tank as the structural integrity of the other pressure compartments can still be maintained if a first pressure compartments fails. Preferably, each pressure compartment comprises an individual in- and/or outlet for filling and/or emptying the respective pressure compartment with the liquefied gas. This allows using the pressure tank in a more flexible manner. One can, for instance, first fill or empty a first pressure compartment, before fulling or emptying a second pressure compartment in the same tank, as it is not required to balance the pressure over the different pressure compartments. It is preferred that said internal volume of the pressure tank is larger than 1000 m3 and wherein said separated pressure compartments have a volume of 1000 m3 or less. Hereby, a segmented pressure tank with an improved economy-of-scale is obtained, as was explained above. Preferably, the transport ship comprises a hull and wherein said pressure tank is positioned inside the hull and separate from the hull, such that the transfer of bending stresses and/or strains from the hull to the pressure tank are reduced. Hence, the pressure tank is preferably structurally separated from the hull of the vessel. To achieve this, the pressure tank preferably is arranged in pair of spaced apart pressure tank saddles that are coupled to the hull of the ship. Preferably, the tank is movably supported in one of said saddles, such that the transfer of stresses resulting from a bending of the ship’s hull are reduced, or minimized, while still fixedly holding the pressure tank in the hull of the ship.
In a preferred embodiment, said circumferential wall is formed from two hollow cylindrical sectors having an angle of 180° for forming a hollow cylinder and wherein said transversely oriented bulkhead separates the interval volume into two separated pressure compartments that are longitudinally arranged in the pressure tank. Hereby, a pressure tank comprising two separated pressure compartments is obtained that benefits from the earlier described economy-of-scale effect. In an alternative preferred embodiment, said circumferential wall is formed from two hollow cylindrical sectors having an angle larger than 180°, preferably larger than 200°, for forming a bi- lobe type pressure tank and wherein said internal wall arrangement, comprising the longitudinally oriented bulkhead and the transversely oriented bulkhead, separates the internal volume into four separated pressure compartments. Hereby, a pressure tank comprising four separated pressure compartments is obtained that benefits from the earlier described economy-of-scale effect. Preferably, said transport ship comprises a plurality of pressure tanks, each comprising the at least two separated pressure compartments, and wherein the plurality of pressure tanks are spaced apart over the length of the ship. This allows obtaining a compact bunker ship having a high capacity that requires less steel to produce, when compared to a traditional liquefied gas ship having a plurality of smaller pressure tanks.
Itis preferred that liquefied gas transport ship is an inland vessel for transporting liquefied gas over inland waterways. In addition, or alternatively, the liquefied gas transport ship is a liquefied natural gas bunker ship. This allows obtaining a compact LNG bunker ship having a high capacity.
In a second aspect, the invention also relates to the pressure tank as comprised in the liquefied gas transport ship. In particular, it relates to a pressure tank for holding liquefied gas, wherein said pressure tank comprises an internal volume and wherein said pressure tank is formed by a closed circumferential wall that is closed off at both, opposite, ends by a respective end cap, wherein, preferably, said circumferential wall is formed from at least two hollow cylindrical sectors having an angle of at least 180° that are arranged substantially parallel with respect to each other, and wherein said pressure tank comprises an internal wall arrangement for separating the internal volume in at least two separated pressure compartments. A liquefied gas transport ship comprising such a segmented pressure tank enables to improve the economy-of-scale, as is described above.
In further aspects the invention relates to a method of manufacturing a liquefied gas transport ship according to any of the preceding embodiments, the method comprising the steps of: - providing a model of a design of the pressure tank;
- providing a set of load cases that are representative for the loading applied to the pressure tank during normal use and/or during accidental events; - determining, using the provided model and set of load cases, a structural integrity of the design of the pressure tank; 5 - approving the design for manufacturing if the determined structural integrity of the design is maintained. This allows obtaining the liquefied gas transport ship having the technical effects and properties described above. Preferably, the method further comprising the step of manufacturing the pressure tank and, preferably, comprising the step of manufacturing the liquefied gas transport ship. In a preferred embodiment of the method, the step of providing a set of load cases comprise providing at least one load case that is representative for a first pressure compartment that is filled with a liquefied gas to a predetermined level and a second pressure compartment that is substantially empty. This allows increasing the flexibility of use of the pressure tank as is described above. It is preferred that the step of providing a set of load cases comprises: providing at least one load case that is representative for a sudden loss of pressure, due to for instance a sudden leak of at least one of the respective pressure compartments. This allows increasing the safety of the pressure tank as is described above. The present invention is further illustrated by the following figures, which show preferred embodiments of the liquefied gas transport ship, and are not intended to limit the scope of the invention in any way, wherein: - Figures 1A - 1C schematically show a LNG bunker vessel according to the prior art in a top view, a cross-sectional view along a longitudinal plane of the bunker vessel and a cross- sectional view along a transverse plane of the bunker vessel.
- Figures 2A - 2C schematically show a LNG bunker vessel according to a first embodiment of the invention in a truncated top view, a cross-sectional view along a longitudinal plane of the bunker vessel and a cross-sectional view along a transverse plane of the bunker vessel.
- Figures 3A - 3C schematically show a LNG bunker vessel according to a second embodiment of the invention in a top view, a cross-sectional view along a longitudinal plane of the bunker vessel and a cross-sectional view along a transverse plane of the bunker vessel.
Figures 1A - 1C schematically show a LNG bunker vessel (or ship) 100 according to the prior art. Figure 1A shows a top view of the bunker vessel 100, figure 1B shows a cross-sectional view along a longitudinal plane of the bunker vessel 100 and a cross-sectional view along a transverse plane of the bunker vessel 100.
The bunker vessel 100 is seen to comprise eight pressure tanks 101 for storing liquefied gas, such as liquefied natural gas. The tanks 101 of the specific embodiments have an interior volume of 1000 m’ and thus represent the current state of art for an 8000 m’ LNG bunker vessel. The eight tanks 101 are arranged in four rows 102, 103, 104, 105, which are spaced apart over the longitudinal direction 1 of the vessel 101, of two tanks 101 each. In order to be able to hold these different pressure tanks 101, a relatively long and large vessel 100 is required, which thereby requires more steel to build and has higher operational costs. Figures 2A - 2C schematically show a LNG bunker vessel 200 according to a first embodiment of the invention in a truncated top view, a cross-sectional view along a longitudinal plane B1 of the bunker vessel 200 and a cross-sectional view along a transverse plane Al of the bunker vessel 200. The bunker vessel 200 comprises two larger (when compared to tanks 101) pressure tanks 220 for storing liquefied gas, such as liquefied natural gas, that are arranged spaced apart along the longitudinal direction 1 of the ship 200.
The pressure tank 220 is substantially formed by a hollow cylinder 227 having a central axis a2, wherein the pressure tank 220 comprises end caps 224, 225 at both opposite, longitudinal ends of the hollow cylinder 227 for closing the tank 220 and forming a sealed off interior volume 226. The pressure tanks 220 further comprises a (gas- and liquid tight) transverse bulkhead 223 that forms a pressure resistant inner wall for separating the interior volume 226 into two separated pressure compartments 221, 222. The transverse bulkhead 223 is arranged substantially perpendicular to the central axis a2 and thereby effectively separates the pressure tank 220 into the two separated pressure compartments 221, 222. Wherein the first pressure compartment 221 is enclosed by the cylindrical wall of the hollow cylinder 227, the first end cap 224 and the transverse bulkhead 223, and the second pressure compartment 222 is enclosed by the cylindrical wall of the hollow cylinder 227, the second end cap 225 and the transverse bulkhead 223. The end caps 224, 225 comprise a spherically shaped head, preferably a tori-spherical head. It is noted that the circumferential wall of the hollow cylinder 227 can be formed from two hollow cylindrical sectors having an angle of 180° around their respective central axes, wherein the respective central axes of the two hollow cylindrical sectors are arranged substantially parallel and coaxial with respect to each other, wherein respective longitudinal edges of the two hollow cylindrical sectors are connected to each other, such that a hollow cylinder 227 is formed around the joint central axis a2.
The pressure tanks 220 are positioned inside the hull 210 and separate from the hull 210. Hereto, each pressure tank 220 is preferably arranged in pair of spaced apart pressure tank saddles (not shown) that are coupled to the hull 210 of the ship 200. Preferably, the tank is movably supported in one of the saddles per pair, such that the transfer of stresses resulting from a bending of the ship’s hull 210 are reduced, or minimized, while still fixedly holding the pressure tank 220 in the hull 210 of the ship 200. The pressure tanks 220 are thereby structurally separated from the hull 210 of the vessel 200. The pressure tanks 220 are preferably fully enclosed in the ship 200, hereto a cover 211 can be arranged over the pressure tanks 220 and connected to the sides of the huli 210 to form an enclosed interior space 212.
Each pressure compartment 221, 222 can comprise an individual in- and/or outlet (not shown) for filling and/or emptying the respective pressure compartment 221, 222 with the liquefied gas. This allows for completely filling the first pressure compartment 221, before filling the second pressure compartment 222 in the same tank, as it is not required to balance the pressure over the different pressure compartments 221, 222. This applies, mutatis mutandis, to emptying the respective pressure compartments 221, 222.
In the specific embodiment of figures 2A - 2C, the pressure compartments 221, 222 have a volume of 1000 m’, such that the pressure tanks 220 can each comprise a maximum of 2000 m’, while still complying with the applicable safety regulations. The obtained LNG bunker vessel 200 thus has a total capacity of 4000 nr’, while only requiring two pressure tanks 220. Hereby, a more compact ship 200 can be built requiring less steel and allowing for decreased operational costs. It is however noted, that the pressure compartments can have a different volume than those given, the compartments may have different volumes and a vessel may be fitted with any number of pressure tanks.
Figures 3A - 3C schematically show a LNG bunker vessel 300 according to a second embodiment of the invention in a truncated top view, a cross-sectional view along a longitudinal plane B2 of the bunker vessel 300 and a cross-sectional view along a transverse plane A2 of the bunker vessel 300. The bunker vessel 300 comprises two larger (when compared to tanks 101 and tanks 220) pressure tanks 320 for storing liquefied gas, such as liquefied natural gas, that are arranged spaced apart along the longitudinal direction I of the ship 300. The functionality and capabilities of tanks 220 and ship 200 are similar to those of tanks 320 and ship 300. Differences with respect to the second embodiment are discussed below. The pressure tank 320 is substantially formed by two interconnected hollow cylindrical sectors 331, 332 having respective central axes a21, a22 that form a closed circumferential wall having a hollow bi-lobed structure 327. Pressure tank 320 comprises end caps 324, 325 at both opposite, longitudinal ends of the hollow bi-lobed structure 327 for closing the tank 320 and forming a sealed off interior volume 326. The closed circumferential wall of the hollow bi-lobed structure 327 can be formed from two hollow cylindrical sectors having an angle larger than 180°, preferably larger than 200 °, around their respective central axes a21, a22, wherein the respective central axes of the two hollow cylindrical sectors are arranged substantially parallel and spaced apart, wherein respective longitudinal edges of the two hollow cylindrical sectors are connected to each other at a first and second intersection line sections 333, 334, such that a hollow hollow bi-lobed structure 327 is formed. In a similar manner tri-lobed pressure tanks can be obtained by arranging three interconnected cylindrical sectors in a similar arrangement, quarter-lobed pressure tanks can be obtained by arranging four interconnected cylindrical sectors in a similar arrangement, and so on. The pressure tanks 320 further comprises a pressure resistant (gas- and liquid tight) internal wall arrangement comprising a pressure resistant (gas- and liquid tight) transverse bulkhead 323 that is arranged substantially perpendicular to the respective central axes a21, a22 and a pressure resistant {gas- and liquid tight) longitudinal bulkhead 334 that is arranged substantially parallel to the respective central axes a21, a22. The longitudinal bulkhead 334 is, in order to provide a robust construction, preferably arranged in between, and connected to, the first and second intersection line sections 333, 334 of hollow bi-lobed structure 327.
The transverse bulkhead 323 and longitudinal bulkhead 334 thereby effectively separate the pressure tank 320 into the four separated pressure compartments 321, 322, 341, 342. The first pressure compartment 321 is enclosed by the cylindrical wall of the first hollow cylindrical sector 331, the first end cap 324, the transverse bulkhead 323 and the longitudinal bulkhead 334, The second pressure compartment 322 is enclosed by the cylindrical wall of the first hollow cylindrical sector 331, the second. end cap 325, the transverse bulkhead 323 and the longitudinal bulkhead
334. The third pressure compartment 341 is enclosed by the cylindrical wall of the second hollow cylindrical sector 332, the first end cap 324, the transverse bulkhead 323 and the longitudinal bulkhead 334. The fourth pressure compartment 342 is enclosed by the cylindrical wall of the second hollow cylindrical sector 332, the second end cap 325, the transverse bulkhead 323 and the longitudinal bulkhead 334. The end caps 324, 325 comprise a spherically shaped head, preferably a tori-spherical head.
Each pressure compartment 321, 322, 341, 342 can comprise an individual in- and/or outlet {not shown) for filling and/or emptying the respective pressure compartment 321, 322, 341, 342 with the liquefied gas, as is also described for the second embodiment.
In the specific embodiment of figures 3A - 3C, the pressure compartments 321, 322, 341, 342 have a volume of 1000 m’ each, such that the pressure tanks 320 can each comprise a maximum of 4000 10m’, while still complying with the applicable safety regulations.
The obtained LNG bunker vessel 300 thus has a total capacity of 8000 m’, while only requiring two pressure tanks 320. Hereby, a more compact ship 300 can be built requiring less steel and allowing for decreased operational costs.
It is however noted, that the pressure compartments can have a different volume than those given, the compartments may have different volumes and a vessel may be fitted with any number of pressure tanks.
It is noted that the present invention is not limited to the embodiment shown, but extends also to other embodiments falling within the scope of the appended claims.

Claims (15)

Conclusies I. Transportschip voor vloeibaar gas omvattende ten minste één druktank voor het vasthouden van vloeibaar gas, waarbij de druktank een inwendig volume omvat en waarbij de druktank wordt gevormd door een gesloten omtrekswand die aan beide tegenoverliggende uiteinden is afgesloten door een respectievelijke eindkap, waarbij de omtrekswand is gevormd uit ten minste twee holle cilindrische sectoren met een hoek van tenminste 180° die in hoofdzaak evenwijdig aan elkaar zijn opgesteld, en waarbij de druktank een binnenwandinrichting omvat voor het scheiden van het inwendige volume in tenminste twee gescheiden drukcompartimenten.Claims I. Liquefied gas transport vessel comprising at least one pressure tank for holding liquefied gas, the pressure tank comprising an interior volume and the pressure tank being formed by a closed circumferential wall closed at both opposite ends by a respective end cap, the circumferential wall is formed of at least two hollow cylindrical sectors with an angle of at least 180° arranged substantially parallel to each other, and wherein the pressure tank comprises an inner wall device for separating the internal volume into at least two separated pressure compartments. 2. Transportschip voor vloeibaar gas volgens conclusie 1, waarbij de binnenwandinrichting een transversaal georiënteerd schot omvat dat in hoofdzaak loodrecht op een lengteas van de holle cilindrische sector is aangebracht.A liquefied gas transport vessel according to claim 1, wherein the inner wall arrangement comprises a transversely oriented bulkhead arranged substantially perpendicular to a longitudinal axis of the hollow cylindrical sector. 3 Transportschip voor vloeibaar gas volgens conclusie 1 of 2, waarbij de binnenwandinrichting een longitudinaal georiënteerd schot omvat dat in hoofdzaak evenwijdig is opgesteld aan een lengteas van de holle cilindrische sector.A liquefied gas transport vessel according to claim 1 or 2, wherein the inner wall arrangement comprises a longitudinally oriented bulkhead arranged substantially parallel to a longitudinal axis of the hollow cylindrical sector. 4. Transportschip voor vloeibaar gas volgens ten minste één van de voorgaande conclusies, waarbij de eindkap een bolvormige kop omvat, bij voorkeur een tori-bolvormige kop.A liquefied gas transport vessel according to at least one of the preceding claims, wherein the end cap comprises a spherical head, preferably a tori-spherical head. 5. Transportschip voor vloeibaar gas volgens ten minste één van de voorgaande conclusies, waarbij de binnenwand een drukbestendige binnenwand is en waarbij elk drukcompartiment een individuele in- en/of uitlaat omvat voor het vullen en/of ledigen van het respectievelijke drukcompartiment met het vloeibare gas, zodanig dat de respectievelijke drukcompartimenten zijn ingericht om afzonderlijk onder druk te worden gezet.Liquid gas transport vessel according to at least one of the preceding claims, wherein the inner wall is a pressure-resistant inner wall and wherein each pressure compartment comprises an individual inlet and/or outlet for filling and/or emptying the respective pressure compartment with the liquid gas such that the respective pressure compartments are arranged to be pressurized separately. 6. Transportschip voor vloeibaar gas volgens ten minste één van de voorgaande conclusies, waarbij het inwendige volume van de druktank groter is dan 1000 m3 en waarbij de gescheiden drukcompartimenten een volume hebben van 1000 m3 of minder.Liquefied gas transport vessel according to at least one of the preceding claims, wherein the internal volume of the pressure tank is greater than 1000 m 3 and wherein the separated pressure compartments have a volume of 1000 m 3 or less. 7. Transportschip voor vloeibaar gas volgens ten minste één van de voorgaande conclusies, waarbij het transportschip een romp omvat en waarbij de druktank binnen de romp is opgesteld en gescheiden is van de romp.Liquefied gas transport vessel according to at least one of the preceding claims, wherein the transport vessel comprises a hull and wherein the pressure tank is arranged within the hull and separated from the hull. 8. Transportschip voor vloeibaar gas volgens ten minste conclusies 1 en 2, waarbij de omtrekswand is gevormd uit twee holle cilindrische sectoren met een hoek van 180 ° voor het vormen van een holle cilinder en waarbij het transversaal georiënteerde schot het inwendige volume in twee gescheiden drukcompartimenten scheidt die in de longitudinale richting zijn gerangschikt in de druktank.Liquefied gas transport vessel according to at least claims 1 and 2, wherein the circumferential wall is formed of two hollow cylindrical sectors with an angle of 180° to form a hollow cylinder and the transversely oriented partition divides the internal volume into two separated pressure compartments separates which are arranged in the longitudinal direction in the pressure tank. 9. Transportschip voor vloeibaar gas volgens ten minste conclusies 1, 2 en 3, waarbij de omtrekswand is gevormd uit twee holle cilindrische sectoren met een hoek groter dan 180°, bij voorkeur groter dan 200°, voor het vormen van een tweelobbig-type druktank en waarbij de 19 binnenwand, omvattende het longitudinaal georiënteerde schot en het transversaal georiënteerde schot, het inwendige volume in vier gescheiden drukcompartimenten verdeelt.Liquefied gas transport vessel according to at least claims 1, 2 and 3, wherein the circumferential wall is formed of two hollow cylindrical sectors with an angle greater than 180°, preferably greater than 200°, to form a bilobal-type pressure tank and wherein the inner wall 19, comprising the longitudinally oriented baffle and the transversely oriented baffle, divides the internal volume into four separate pressure compartments. 10. Transportschip voor vloeibaar gas volgens ten minste één van de voorgaande conclusies, waarbij het transportschip meerdere druktanks omvat, die elk de ten minste twee gescheiden drukcompartimenten omvatten, en waarbij de meerdere druktanks op afstand van elkaar zijn geplaatst over de lengte van het schip.A liquefied gas transport vessel according to at least one of the preceding claims, wherein the transport vessel comprises a plurality of pressure tanks, each comprising the at least two separate pressure compartments, and wherein the plurality of pressure tanks are spaced apart along the length of the vessel. 11. Transportschip voor vloeibaar gas volgens ten minste één van de voorgaande conclusies, waarbij het transportschip voor vloeibaar gas een vloeibaar-aardgasbunkerschip is.Liquefied gas transport vessel according to at least one of the preceding claims, wherein the liquid gas transport vessel is a liquefied natural gas bunkering vessel. 12. Druktank zoals opgenomen in het transportschip voor vloeibaar gas volgens ten minste één van de voorgaande conclusies.A pressure tank as included in the liquefied gas transport vessel according to at least one of the preceding claims. 13. Werkwijze voor het vervaardigen van een transportschip voor vloeibaar gas volgens ten minste één van de voorgaande conclusies 1-11, waarbij de werkwijze de stappen omvat van: - het verschaffen van een model van een ontwerp van de druktank; - het verschaffen van een reeks belastingsituaties die representatief zijn voor de belasting die wordt uitgeoefend op de druktank tijdens normaal gebruik en/of tijdens accidentele gebeurtenissen; - het bepalen, aan de hand van het verschafte model en de reeks belastingsituaties, van een structurele integriteit van het ontwerp van de druktank; - het goedkeuren van het ontwerp voor fabricage als de vastgestelde structurele integriteit van het ontwerp behouden blijft.A method of manufacturing a liquefied gas transport ship according to at least one of the preceding claims 1-11, the method comprising the steps of: - providing a model of a design of the pressure tank; - providing a series of load situations representative of the load applied to the pressure tank during normal use and/or during accidental events; - determining, on the basis of the provided model and the range of loading situations, a structural integrity of the design of the pressure tank; - Approving the design for fabrication if the established structural integrity of the design is maintained. 14. Werkwijze voor het vervaardigen van een transportschip voor vloeibaar gas volgens conclusie 13, waarbij de stap van het verschaffen van een reeks belastingsituaties omvat het voorzien van ten minste één belastingsituatie die representatief is voor een eerste drukcompartiment dat tot een vooraf bepaald niveau is gevuld met een vloeibaar gas en een tweede drukcompartiment dat nagenoeg leeg is.The method of manufacturing a liquefied gas transport vessel according to claim 13, wherein the step of providing a sequence of load situations comprises providing at least one load situation representative of a first pressure compartment filled to a predetermined level with a liquefied gas and a second pressure compartment which is substantially empty. 15. Werkwijze voor het vervaardigen van een transportschip voor vloeibaar gas volgens conclusie 13 of 14, waarbij de stap van het verschaffen van een set belastingsituaties omvat: - het voorzien van tenminste één belastingsituatie die representatief is voor een plotseling drukverlies, bijvoorbeeld door een plotselinge lekkage van tenminste één van de respectievelijke drukcompartimenten.A method for manufacturing a liquefied gas transport ship according to claim 13 or 14, wherein the step of providing a set of load situations comprises: - providing at least one load situation representative of a sudden loss of pressure, for example due to a sudden leakage of at least one of the respective pressure compartments. 16, Werkwijze voor het vervaardigen van een transportschip voor vloeibaar gas volgens conclusie 13, 14 of 15, verder omvattende de stap van het vervaardigen van de druktank en bij voorkeur omvattende de stap van het vervaardigen van het transportschip voor vloeibaar gas.A method of manufacturing a liquefied gas carrier according to claim 13, 14 or 15, further comprising the step of manufacturing the pressure tank and preferably comprising the step of manufacturing the liquefied gas carrier.
NL2027095A 2020-12-11 2020-12-11 Liquefied Natural Gas Bunker Ship NL2027095B1 (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3092063A (en) * 1960-10-05 1963-06-04 Anciens Chantiers Dubigeon Sa Construction of liquefied gas carriers
FR81642E (en) * 1962-05-14 1963-10-18 Method and equipment for transporting liquefied gases by water
CH376015A (en) * 1960-08-31 1964-03-15 Georges Moreau Raymond Machine for the transport of liquefied gas
JP2013184504A (en) * 2012-03-06 2013-09-19 Mitsui Eng & Shipbuild Co Ltd Ship, sea floating type equipment, and method for storing liquefied natural gas
KR20180060238A (en) * 2016-11-28 2018-06-07 주식회사 엔케이 Liquified gas storage tank having corrugated baffle
US10710682B1 (en) * 2019-08-26 2020-07-14 Tritec Marine Ltd. Bunkering marine vessel

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH376015A (en) * 1960-08-31 1964-03-15 Georges Moreau Raymond Machine for the transport of liquefied gas
US3092063A (en) * 1960-10-05 1963-06-04 Anciens Chantiers Dubigeon Sa Construction of liquefied gas carriers
FR81642E (en) * 1962-05-14 1963-10-18 Method and equipment for transporting liquefied gases by water
JP2013184504A (en) * 2012-03-06 2013-09-19 Mitsui Eng & Shipbuild Co Ltd Ship, sea floating type equipment, and method for storing liquefied natural gas
KR20180060238A (en) * 2016-11-28 2018-06-07 주식회사 엔케이 Liquified gas storage tank having corrugated baffle
US10710682B1 (en) * 2019-08-26 2020-07-14 Tritec Marine Ltd. Bunkering marine vessel

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