EP2610161B1 - Support structure for cargo tank, floating structure, and support method for cargo tank - Google Patents
Support structure for cargo tank, floating structure, and support method for cargo tank Download PDFInfo
- Publication number
- EP2610161B1 EP2610161B1 EP11819942.1A EP11819942A EP2610161B1 EP 2610161 B1 EP2610161 B1 EP 2610161B1 EP 11819942 A EP11819942 A EP 11819942A EP 2610161 B1 EP2610161 B1 EP 2610161B1
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- EP
- European Patent Office
- Prior art keywords
- support
- cargo tank
- floating structure
- horizontal load
- support portion
- Prior art date
- Legal status (The legal status 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 status listed.)
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Images
Classifications
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- 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
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/08—Mounting arrangements for vessels
-
- 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
-
- 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
- B63B2025/087—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid comprising self-contained tanks installed in the ship structure as separate units
-
- 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
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/01—Reinforcing or suspension means
- F17C2203/011—Reinforcing means
-
- 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
- F17C2205/0153—Details of mounting arrangements
- F17C2205/018—Supporting feet
-
- 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
- F17C2205/0153—Details of mounting arrangements
- F17C2205/0192—Details of mounting arrangements with external bearing means
-
- 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
-
- 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
Definitions
- the present invention relates to a cargo tank support structure, a floating structure and a method of supporting a cargo tank, more specifically, a support structure bearing vertical and horizontal loads applied by a cargo tank mounted on a floating structure, a floating structure including the support structure, and a method of supporting a cargo tank.
- Floating structures such as carrier vessels or offshore floating equipment, for transporting or storing liquid cargo, such as petroleum, LPG (liquefied petroleum gas) or LNG (liquefied natural gas), of an independent tank type, namely having cargo tanks for such liquid cargo, independent from the floating structure, are in wide use (see patent documents 1 and 2, for example).
- liquid cargo such as petroleum, LPG (liquefied petroleum gas) or LNG (liquefied natural gas)
- LPG liquefied petroleum gas
- LNG liquefied natural gas
- GB 1 328 758 A which is considered the closest prior art and which relates to a storage tank assembly comprising a plurality of pairs of guide blocks disposed such that one block of each pair is connected to either the bottom or the ceiling of a tank supported for movement on a horizontal plane and the other block of each pair is connected to the respective bottom or ceiling of a tank supporting structure at ambient temperature associated therewith, the guide blocks in each pair being in side-to-side contact with each other for relative sliding movement along a respective one of at least two vertical planes passing through the vertical central axis of the tank and intersecting at said central axis, each pair being spaced from adjacent pairs, said two vertical planes defining four sections or quadrants, such that in one pair of mutually opposite sections or quadrants are located only the guide blocks attached to the tank and in the other pair of mutually opposite sections or quadrants are located only the blocks attached to the tank supporting structure the arrangement being such that the tank is free to expand or contract about said central axis whereas rotational and horizontal movement of the tank is prevented.
- FR 1 317 043 A relates to a tank for boats which is intended to carry low-temperature liquids, such as liquefied methane, said tank being immobilized laterally with respect to the hull structure of the boat, while being free to expand and shrink laterally, said lateral immobilization of the tank being ensured by at least two substantially horizontal keys that relate the tank bottom to the structure of said hull.
- the temperature of the cargo may vary from the ambient temperature of the carrier.
- the carrier has a hull having plural aligned holds within, each said hold including one tank which extends substantially fully abeam the carrier and is spaced on all sides from said hold.
- Each said hold further includes means fixed to the floor of the hold anchoring said tank including vertically aligned tank slide and foundation assemblies in longitudinal and transverse coextension of the bottom of the tank, the assemblies each being fixed respectively to tank and floor, raising the tank above the floor.
- the tank further includes a plurality of pins extending through respective foundation and slide members. Both said foundation and slide members having aligned pin-engaging apertures, the apertures of the slides being of greater dimension than the apertures of the corresponding foundations, whereby controlled expanding and contracting movements of tank relative to foundation may occur upon cargo temperature variation.
- Patent document 1 discloses, in Figs. 5 and 6 , a cargo tank support structure comprising bearing seats, anti-floatation chocks and anti-roll chocks, where the bearing seats bear a vertical load applied by a cargo tank, the anti-roll chocks bear a horizontal load applied by the cargo tank displaced sideway by roll of the ship, and anti-floatation chocks restricts floatation of the cargo tank when the ship is flooded.
- loads applied by the weight of the floating structure itself and various motions of the floating structure caused by waves are borne primarily by the bearing seats and the anti-roll chocks.
- the bearing seats are provided at the floor of the hull, and the anti-roll chokes are provided at the ceiling and the floor of the hull.
- Patent document 2 discloses, in Fig. 6 , a structure in which support members for supporting an independent tank are provided at varying density considering the magnitude of reaction force to be borne by respective support members.
- the cargo tank support structure disclosed in patent document 1 comprises support members (bearing seats) bearing the vertical load applied by the cargo tank, support members (anti-roll chocks) bearing the horizontal load applied by the cargo tank, and also support members bearing the horizontal load, provided at the ceiling of the floating structure. Since the support members are provided at the floor and the ceiling, construction of the cargo tank as well as construction of the floating structure takes much time. Further, since the cargo tank experience reaction force at the locations at which the cargo tank is supported by the support members, reinforcing members need to be provided on the inner side of the cargo tank at those locations. Also for this reason, a greater number of support members and/or a wider distribution of support members results in a greater amount of time taken for cargo tank construction and higher production costs.
- An object of the present invention is to provide a cargo tank support structure, a floating structure and a method of supporting a cargo tank, requiring a reduced number of support members and a reduced number of locations at which to provide support members, and thus, enabling a reduction in time taken for construction work and a reduction in construction costs.
- the present invention provides a floating structure comprising a cargo tank and a cargo tank support structure for supporting the cargo tank mounted in a hold in the floating structure, the cargo tank support structure comprising: a plurality of first support portions provided at a bottom of the cargo tank in a distributed manner, a second support portion provided at the bottom of the cargo tank to continuously extend in a longitudinal direction of the floating structure, and an engagement portion provided at a floor of the hold along the length of the second support portion to engage with the second support portion, wherein when a load is applied by the cargo tank, at least the first support portions bear a vertical load and at least the second support portion and the corresponding engagement portion bear a horizontal load in both width directions of the floating structure, and wherein the horizontal load is split into a first horizontal load in a width direction of the floating structure and a second horizontal load in the longitudinal direction of the floating structure, the first horizontal load being borne by the second support portion and the corresponding engagement portion, and the second horizontal load being borne by the first support portions.
- the second support portion may be provided along the longitudinal center line of the floating structure.
- the hold may have a ceiling covering the cargo tank, the ceiling having no support portion bearing the horizontal load applied by the cargo tank.
- the second support portion may be adapted to bear the vertical load applied by the cargo tank.
- the cargo tank support structure may further comprise first seats and a second seat provided at the floor of the hold, the first seats being adapted to support the first support portions in a manner allowing the first support portions to slide thereon, and the second seat being adapted to support the second support portion, wherein the engagement portion is provided at the second seat.
- the horizontal load may be split into a first horizontal load in a width direction of the floating structure and a second horizontal load in the longitudinal direction of the floating structure, the first horizontal load being borne by the second support portion and the corresponding engagement portion, and the second horizontal load being borne by the first support portions.
- the cargo tank support structure may further comprise engagement portions provided at the floor of the hold along the width of the floating structure to engage with corresponding ones of the first support portions so that the second horizontal load is borne by the engagement portions and the corresponding first support portions.
- the first and second support portions each may comprise a frame providing a downwardly-open recess and a support block fixed in the recess to project from the frame downward.
- the cargo tank support structure may further comprise a plurality of reinforcing members provided at an inner side of the bottom of the cargo tank to extend in the longitudinal direction of the floating structure, parallel to each other, wherein the support block has a width smaller than a distance between the adjacent reinforcing members.
- the present invention also provides a method of supporting a cargo tank mounted in a hold in a floating structure, wherein a vertical load and a horizontal load applied by the cargo tank is borne by support portions all provided on the floor side of the hold.
- support portions bearing the vertical and horizontal loads applied by the cargo tank are all provided on the floor side of the hold, where the horizontal load is borne by the second support portion provided to continuously extend in the longitudinal direction of the floating structure.
- This enables the vertical and horizontal loads applied by the cargo tank to be borne by a reduced number of support portions at a reduced number of locations, and thus, enables a reduction in time taken for construction work and a reduction in construction costs.
- omission of chocks at the ceiling means increased independence of the cargo tank, which provides increased freedom of deck design and construction, leading to a reduction in costs and wider application.
- FIG. 1 is a cross-sectional view showing a first embodiment of a cargo tank support structure according to the present invention
- Figs. 2A a partial enlarged view showing a first support portion of the support structure shown in Fig. 1
- Fig. 2B a partial enlarged view showing a second support portion thereof
- Fig. 3A a diagram showing a bottom structure of a cargo tank
- Fig. 3B a diagram showing a floor structure of a hold, the bottom structure and the floor structure being constituent parts of the support structure shown in Fig. 1 .
- a floating structure 1 For convenience in the description, the length, width and height of a floating structure 1 are chosen as X-axis, Y-axis and Z-axis, respectively, in Figs. 1 to 3 .
- a first embodiment of a cargo tank support structure designed to support a cargo tank 2 mounted in a hold 11 in a floating structure 1, comprises a plurality of first support portions 3 provided at the bottom 2a of the cargo tank 2 in a distributed manner, a second support portion 4 provided at the bottom 2a of the cargo tank 2 to continuously extend in the longitudinal direction X of the floating structure 1, and an engagement portion 5 provided at the floor 11a of the hold 11 along the length of the second support portion 4, thus in the X-direction, to engage with the second support portion 4, where a vertical load Fz applied by the cargo tank 2 is borne by at least the first support portions 3 and a horizontal load applied by the cargo tank 2 (first horizontal load Fy, in particular) is borne by at least the second support portion 4 and the engagement portion 5.
- the horizontal load can be split into a first horizontal load Fy in the width direction Y of the floating structure 1, and a second horizontal load Fx in the longitudinal direction X of the floating structure 1.
- the floating structure 1 is a LNG carrier of a self-supporting prismatic type, for example.
- the self-supporting prismatic LNG carrier (floating structure 1) has a double-hull 12 defining a hold 11 inside for carrying a cargo tank 2. Since the cargo tank 2 is prismatic in shape, the hold 11 is also prismatic in shape.
- the hold 11 is defined by a floor 11a and a ceiling 11b, the floor 11a facing the bottom 2a of the cargo tank 2 and the ceiling 1b covering the top of the cargo tank 2.
- the ceiling 11b has no support portion bearing the horizontal load applied by the cargo tank 2. Support portions are all provided at the bottom 2a, as will be described below.
- the cargo tank 2 is designed to hold liquid cargo, such as petroleum, LPG or LNG (liquefied natural gas).
- LNG is natural gas that has converted to liquid form by cooling it to -162°C or below, and requires maintaining at low temperature.
- the outer side of the cargo tank 2 is covered with a heat insulating material 21 shaped in panels.
- This cargo tank 2 is an independent type, namely constructed independently from the hull 12.
- the cargo tank 2 is mounted in the hold 11, where in order to support its own weight and reduce heat transfer from the hull 12, the cargo tank 2 has support members (first support portions 3 and second support portion 4, for example) at the bottom 2a, which allows the cargo tank to be mounted with the support members on the floor 11a of the hold 11.
- the present invention is characterized by this cargo tank 2 support structure.
- the cargo tank 2 has various reinforcing members on the inner side, Fig. 1 shows only those reinforcing members 22 provided to extend in the longitudinal direction X of the hull 12, parallel to each other.
- the first support portions 3 bear the weight of the cargo tank 2 itself, or vertical load Fz applied by the cargo tank 2.
- the first support portions 3 each comprise a frame 31 providing a downwardly-open recess and a support block 32 fixed in the recess to project from the frame 31 downward.
- the support block 32 is fitted and fixed in the frame 31.
- the support block 32 is made from square timber, for example, and fixed in the frame 31 by press-fitting.
- the support block 32 may, of course, be fixed to the frame 31 with metal fastening pieces.
- a reinforcing material 31a is provided to surround the frame 31 in an appropriate geometry.
- the support block 32 may be a conventional support block. For example, it may be made from an elastic material having low thermal conductivity, such as rubber or resin, or square timber with a coat of such elastic material.
- first seats 13 are provided to face and support the first support portions 3, respectively, in a manner allowing them to slide thereon.
- the first seat 13 is a solid or hollow or symbol "#"-shaped metal portion with an approximately-flat top face.
- a reinforcing material 13a is provided to surround the first seat 13 in an appropriate geometry.
- the cargo tank is mounted with the support blocks 32 of the first support portions 3 slidably seated on the top faces of the first seats 13.
- the first seats 13 may be made by machining the floor 11a of the hold 11 itself. When unnecessary, the first seats 13 may be omitted so that the support blocks 32 are supported directly by the floor 11a.
- the first support portions 3 are arranged on both sides of the longitudinal center line L of the floating structure 1, in a manner distributed over the bottom 2a of the cargo tank 2.
- the first support portions 3 are arrayed in two rows and eight columns on the portside as well as on the starboard side.
- the first seats 13 are arranged at the locations corresponding to the first support portions 3.
- the cargo tank support structure may be designed such that the second horizontal load Fx is borne by the first support portions 3 while the first horizontal load Fy is borne by the second support portion 4 and the engagement portion 5.
- the first seats 13 in the second column from the left each have an engagement portion 15 similar in shape to the engagement portion 5, described later.
- the engagement portions 15 are provided at the floor 11a of the hold 11, along the width of the floating structure 1, thus in the Y-direction, to engage with the corresponding first support portions 3 so that the second horizontal load Fx is borne by the engagement portions 15 and the corresponding first support portions 3.
- the provision of the engagement portions 15 makes it possible to bear the horizontal load applied in varying magnitude and direction.
- the engagement portions 15 may be provided in a desired manner; an increased number of the engagement portions 15 may be provided, and the engagement portions 15 may be provided at different locations, as compared with the example shown in the Figure. If the second horizontal load Fx is negligibly small in magnitude as compared with the first horizontal load Fy, the engagement portions 15 may be omitted.
- the second support portion 4 bears at least the horizontal load (first horizontal load Fy) applied by the cargo tank 2. While traveling or moored, the floating structure 1 experiences various motions (heave, sway, surge, pitch, yaw, roll) caused by waves, so that the cargo tank 2 applies first and second horizontal loads Fy, Fx, namely loads in the width and longitudinal directions Y, X of the hull, respectively.
- the second support portion 4 bears the first horizontal load Fy.
- Floating structures having a long and thin hull 12, such as LNG carries, in particular, are likely to experience a great load in the width direction Y; the first horizontal load Fy is likely to be greater than the second horizontal load Fx.
- the second support portion 4 comprises a frame 41 providing a downwardly-open recess and a support block 42 fixed in the recess to project from the frame 41 downward.
- the support block 42 is fitted and fixed in the frame 41.
- the support block 42 is made from square timber, for example, and fixed in the frame 41 by press-fitting.
- the support block 42 may, of course, be fixed to the frame 41 with metal fastening pieces.
- a reinforcing material 41a is provided to surround the frame 41 in an appropriate geometry.
- the support block 42 may be a conventional support block. For example, it may be made from an elastic material having low thermal conductivity, such as rubber or resign, or square timber with a coat of such elastic material.
- a second seat 14 is provided to face and support the second support portion 4.
- the second seat 14 is a solid or hollow or symbol "#"-shaped metal portion with an approximately-flat top face.
- a reinforcement material 14a is provided to surround the second seat 14 in an appropriate geometry.
- the second seat 14 has the top face at the same level as the top faces of the first seats 13, on which the support block 42 of the second support portion 4 is seated.
- the second support portion 4 thus shares the vertical load Fz applied by the cargo tank 2.
- the load to be borne by the first support portions 3 is reduced, which allows a reduction in number of the first support portions 3 and/or a reduction in size of the first support portions 3.
- the engagement portion 5 is provided at the second seat 14.
- the engagement portion 5 is formed by attaching pieces of structural steel, such as steel angle or plate, to either side of the second seat 14 in the longitudinal direction X, by welding or other process.
- the engagement portion 5 may be formed by attaching the pieces of structural steel to either the top or the sides of the second seat 14.
- the engagement portion 5 provided this way can bear the first horizontal load Fy, restricting the movement of the support block 42 on the second seat 14 in the width direction Y
- the second support portion 4 is provided to extend on the longitudinal center line L of the floating structure 1 in the X-direction.
- the second seat 14 and the engagement portion 5 extend on the longitudinal center line L of the floating structure 1 in the X-direction.
- the second support portion 4 and the engagement portion 5, both extending long in the longitudinal direction X, provide a pressure-receiving area great enough to bear the first horizontal load Fy.
- the engagement portion 5 extends in the X-direction over the entire length of the second seat 14, the engagement portion 5 may have any length enough to bear the expected magnitude of the first horizontal load Fy.
- the engagement portion 5 may be made of separate longitudinal portions arranged in the longitudinal direction X.
- Figs. 4A and 4B are diagram showing a bottom and a top of a cargo tank, respectively, for explaining how a horizontal load is borne in a prior-art support structure.
- the cargo 20 tank support structure typically comprises a plurality of tanks supports 30 provided at the bottom 20a of the cargo tank 20 in a distributed manner, and a plurality of anti-roll chocks 40 provided at the top 20b of the cargo tank 20 on the longitudinal center line L of the hull.
- the cargo tank 20 is mounted with the tank supports 30 on the hold floor and with the anti-roll chocks 40 engaged with engagement portions provided at the hold ceiling.
- the vertical load applied by the cargo tank 20 is borne by the tank supports 30, and the horizontal load by the anti-roll chocks 40 and some of the tank supports 30.
- the cargo tank 20 has a tank dome 20c at the top, which provides access to the inside of the cargo tank for carrying in and out LNG and for tank maintenance.
- the above-described prior-art support structure having the support members (tank supports 30 and anti-roll chocks 40) at both the bottom 20a and the top 20b of the cargo tank has a drawback such that construction of the floating structure as well as construction of the cargo tank 20 takes much time.
- the present embodiment by contrast, has a portion functioning as anti-roll chocks at the bottom 2a of the cargo tank 2.
- the present embodiment is a method of supporting a cargo tank 2 mounted in a hold 11 in a floating structure 1, wherein the horizontal load (first horizontal load Fy and second horizontal load Fx) as well as the vertical load Fz applied by the cargo tank 2 is borne by support portions all provided on the floor 11a side of the hold 11.
- the present embodiment thus does not require that support portions bearing the horizontal load (first horizontal load Fy and second horizontal load Fx) applied by the cargo tank 2 be provided at the top of the cargo tank 2.
- the present embodiment thus allows a reduction in number of locations at which to provide support members and a reduction in size of support members, which leads to reduced time taken for construction work.
- the second support portion 4 extending linearly and continuously in the longitudinal direction X leads to simple arrangement of heat insulating material 2 around it, as compared with the prior art in which the heat insulating material needs to be arranged to surround each of the separate tank supports 30 provided in a distributed manner in the area of the second support portion 4. This also leads to reduced time taken for construction work.
- FIGS. 5A to 5D show second to fifth embodiments of the cargo tank support structure according to the present invention, respectively
- Figs. 6A and 6B show sixth and seventh embodiments of the cargo tank support structure according to the present invention, respectively.
- Those components which are similar to components of the first embodiment are denoted by the same reference characters, and the description thereof will be omitted.
- Figs. 5A to 5D each show the bottom 2a of the cargo tank 2 in a manner comparable to Fig. 3A .
- the second support portion 4 is divided into parts. Although in the shown example, the second support portion 4 is divided into two parts, it may be divided into three or more parts.
- Dividing the second support portion 4 into parts provides a passage between the adjacent parts, through which a worker can come and go between the opposite sides of the second support portion 4. This is convenient for maintenance work and others.
- the second support portion 4 is provided to extend in the longitudinal direction X, off the longitudinal center line L.
- the second support portion 4 may be arranged on any longitudinal line other than the longitudinal center line as in the third embodiment, to suit the expected horizontal load, which varies depending on ship type, cargo, shipping route and others.
- the second support portion 4 includes a part arranged on another longitudinal line than the longitudinal center line L.
- the second support portion 4 is divided into three parts, of which the middle one 4 is arranged on a longitudinal line near a longitudinal edge of the bottom 2a of the cargo tank 2 and the other two 4 are arranged on the longitudinal center line L.
- the second support portion 4 may be provided in a distributed manner as in the fourth embodiment to suit the expected horizontal load, which varies depending on ship type, cargo, shipping route and others, within the constraints on arrangement imposed by the hull.
- the first support portions 3 are approximately rectangular in shape.
- the first support portion 3 has a greater size in the width direction Y of the floating structure than in the longitudinal direction X thereof, the first support portion 3 may have a greater size in the longitudinal direction X than in the width direction Y.
- This type of first support portion 3 is provided, as it were, by combining some conventional first support portions 3 into one. Choosing the rectangular shape in place of the square shape makes it possible to reduce the number of support portions 3 while providing the pressure-receiving area enough to bear the vertical load Fz, leading to a reduction in time taken for construction work.
- the second support portion 4 has an altered structure.
- Figs. 6A and 6B each show the second portion 4 in a manner comparable to Fig. 2B .
- the second seat 14 is omitted.
- the second seat 14 can be omitted, for example when the first seats 13 are omitted or when the second support 4 is not intended to bear the vertical load Fz.
- the engagement portion 5 is provided directly at the floor 11a of the hold 11.
- a reinforcing material 5a may be provided on the outer side of the engagement portion 5.
- the second support portion 4 is not intended to bear the vertical load Fz (the vertical load Fz is borne only by the first support portions 3), and thus, the block 42 is not in contact with the floor 11a of the hold 11. It may be altered such that the block 42 is in contact with the floor 11a so that the second support portion 4 shares the vertical load Fz.
- the cargo tank 2 has a plurality of reinforcing members 22 provided on the inner side of the bottom to extend in the longitudinal direction X, parallel to each other, where the support block 42 has a width Yb smaller than the distance Yg between the adjacent reinforcing members 22, 22.
- This can reduce the area not covered with the heat insulating material 21, and thus, provide improved cold storage performance.
- the heat insulating material 21 is shaped in panels, the second support portion 4 is easily provided between the panels. The second support portion 4 of this type can therefore reduce the area not covered with the heat insulating material 21, and at the same time facilitates application of the heat insulating material 21.
- FIG. 7A is a diagram schematically showing the overall structure of a ship, an embodiment of a floating structure according to the present invention, and Fig. 7B shows off-shore floating equipment, another embodiment of the floating structure.
- the floating structures 1 shown in Figs. 7A and 7B each comprise a main body 1a floating by being supported by a buoyant force, the main body 1a having a hold 11 with cargo tanks 2 mounted in.
- the floating structure 1 shown in Fig. 7A is a self-supporting prismatic LNG carrier, and the main body 1a is a hull 12.
- the floating structure 1 is not restricted to the LNG carrier; it may be a petroleum tanker, an LPG carrier, a chemical tanker or the like although it needs to be a vessel designed to carry self-supporting prismatic cargo tanks 2.
- the floating structure 1 shown in Fig. 7B is offshore-floating self-supporting prismatic LNG equipment exemplified by an FPSO (floating production, storage and offloading system).
- the FPSO is a floating structure 1 moored offshore by mooring cable 1b, having LNG production equipment 1c on the deck, wherein the LNG produced is stored in cargo tanks 2 within the FPSO until offloaded onto a carrier.
- the FPSO may be designed for processing petroleum or LPG. If the production of such fuel is not intended, the floating structure 1 may be an FSO (floating storage and offloading system) which is offshore floating equipment not comprising production equipment 1c.
- the FSO is designed to only store and offload fuel.
- the floating structure 1 has cargo tanks 2 independent from the main body 1a, and the cargo tanks 2 are supported with the support structure according to the present invention, exemplified by the above-described first to seventh embodiments, and thus, the support portions bearing the vertical load Fz and horizontal load (first horizontal load Fy and second horizontal load Fx) applied by the cargo tank 2 are all provided on the floor 11a side of the hold 11.
- the "vertical load” is a load acting vertically on the floating structure 1 buoyed by static water
- the “horizontal load” is a load acting horizontally on the floating structure 1 buoyed by static water.
- the frame of reference within which these loads are measured may be either a relative coordinate system varying depending on oscillation of the floating structure 1 or an absolute coordinate system fixed irrespective of oscillation of the floating structure 1.
- the present invention is not restricted to the described embodiments, which can be altered in various ways without departing from the scope of the present invention.
- the present invention is applicable to floating structures 1 having anti-floatation chocks and floating structures 1 not having a ceiling 11b of a hold 11 covering a cargo tank 2.
Description
- The present invention relates to a cargo tank support structure, a floating structure and a method of supporting a cargo tank, more specifically, a support structure bearing vertical and horizontal loads applied by a cargo tank mounted on a floating structure, a floating structure including the support structure, and a method of supporting a cargo tank.
- Floating structures, such as carrier vessels or offshore floating equipment, for transporting or storing liquid cargo, such as petroleum, LPG (liquefied petroleum gas) or LNG (liquefied natural gas), of an independent tank type, namely having cargo tanks for such liquid cargo, independent from the floating structure, are in wide use (see
patent documents 1 and 2, for example). - While traveling or moored, floating structures experience heave, or liner vertical motion, sway, or linear lateral motion, surge, or linear longitudinal motion, pitch, or rotation about the transverse axis, yaw, or rotation about the vertical axis, and roll, or rotation about the longitudinal axis, caused by waves. Actually, they experience complex motions resulting from combinations of these motions. It is therefore important to stably support independent cargo tanks that can move relative to the floating structure.
-
GB 1 328 758 A -
FR 1 317 043 A - In bulk fluid carrier constructions according to document
US 3 064 612 A , the temperature of the cargo may vary from the ambient temperature of the carrier. The carrier has a hull having plural aligned holds within, each said hold including one tank which extends substantially fully abeam the carrier and is spaced on all sides from said hold. Each said hold further includes means fixed to the floor of the hold anchoring said tank including vertically aligned tank slide and foundation assemblies in longitudinal and transverse coextension of the bottom of the tank, the assemblies each being fixed respectively to tank and floor, raising the tank above the floor. The tank further includes a plurality of pins extending through respective foundation and slide members. Both said foundation and slide members having aligned pin-engaging apertures, the apertures of the slides being of greater dimension than the apertures of the corresponding foundations, whereby controlled expanding and contracting movements of tank relative to foundation may occur upon cargo temperature variation. - Patent document 1 discloses, in
Figs. 5 and6 , a cargo tank support structure comprising bearing seats, anti-floatation chocks and anti-roll chocks, where the bearing seats bear a vertical load applied by a cargo tank, the anti-roll chocks bear a horizontal load applied by the cargo tank displaced sideway by roll of the ship, and anti-floatation chocks restricts floatation of the cargo tank when the ship is flooded. In this support structure, loads applied by the weight of the floating structure itself and various motions of the floating structure caused by waves are borne primarily by the bearing seats and the anti-roll chocks. As seen in patent document 1, the bearing seats are provided at the floor of the hull, and the anti-roll chokes are provided at the ceiling and the floor of the hull. -
Patent document 2 discloses, inFig. 6 , a structure in which support members for supporting an independent tank are provided at varying density considering the magnitude of reaction force to be borne by respective support members. - The support structure disclosed in
patent document 2 is created paying attention to distribution of the vertical load applied by the cargo tank, and exhibits only those support elements which correspond to the bearing seats in patent document 1. -
- Patent Document 1:
JP 2000-177681 A Figs. 5 and6 - Patent Document 2:
JP S59-5492 U Fig. 6 - The cargo tank support structure disclosed in patent document 1 comprises support members (bearing seats) bearing the vertical load applied by the cargo tank, support members (anti-roll chocks) bearing the horizontal load applied by the cargo tank, and also support members bearing the horizontal load, provided at the ceiling of the floating structure. Since the support members are provided at the floor and the ceiling, construction of the cargo tank as well as construction of the floating structure takes much time. Further, since the cargo tank experience reaction force at the locations at which the cargo tank is supported by the support members, reinforcing members need to be provided on the inner side of the cargo tank at those locations. Also for this reason, a greater number of support members and/or a wider distribution of support members results in a greater amount of time taken for cargo tank construction and higher production costs.
- For the cargo tank support structure disclosed in
patent document 2, it is necessary to calculate reaction force to be borne by respective support members and determine in what shapes and at what locations to provide support members on the floating structure, leading to much time taken for design work. In addition, only providing the support members designed to bear the reaction force is not enough to bear a large horizontal load applied when the floating structure experiences motions such as roll, sway and yaw; the provision of support members bearing the horizontal load, such as the anti-roll chocks disclosed in patent document 1, is required. The cargo tank support structure disclosed inpatent document 2 is therefore not free of the problem with the structure disclosed in patent document 1. - The present invention has been made in view of the above problems. An object of the present invention is to provide a cargo tank support structure, a floating structure and a method of supporting a cargo tank, requiring a reduced number of support members and a reduced number of locations at which to provide support members, and thus, enabling a reduction in time taken for construction work and a reduction in construction costs.
- In order to achieve the above object, the present invention provides a floating structure comprising a cargo tank and a cargo tank support structure for supporting the cargo tank mounted in a hold in the floating structure, the cargo tank support structure comprising: a plurality of first support portions provided at a bottom of the cargo tank in a distributed manner, a second support portion provided at the bottom of the cargo tank to continuously extend in a longitudinal direction of the floating structure, and an engagement portion provided at a floor of the hold along the length of the second support portion to engage with the second support portion, wherein when a load is applied by the cargo tank, at least the first support portions bear a vertical load and at least the second support portion and the corresponding engagement portion bear a horizontal load in both width directions of the floating structure, and wherein the horizontal load is split into a first horizontal load in a width direction of the floating structure and a second horizontal load in the longitudinal direction of the floating structure, the first horizontal load being borne by the second support portion and the corresponding engagement portion, and the second horizontal load being borne by the first support portions.
- In the above-described cargo tank support structure and floating structure, the second support portion may be provided along the longitudinal center line of the floating structure. The hold may have a ceiling covering the cargo tank, the ceiling having no support portion bearing the horizontal load applied by the cargo tank.
- The second support portion may be adapted to bear the vertical load applied by the cargo tank. The cargo tank support structure may further comprise first seats and a second seat provided at the floor of the hold, the first seats being adapted to support the first support portions in a manner allowing the first support portions to slide thereon, and the second seat being adapted to support the second support portion, wherein the engagement portion is provided at the second seat.
- The horizontal load may be split into a first horizontal load in a width direction of the floating structure and a second horizontal load in the longitudinal direction of the floating structure, the first horizontal load being borne by the second support portion and the corresponding engagement portion, and the second horizontal load being borne by the first support portions.
- The cargo tank support structure may further comprise engagement portions provided at the floor of the hold along the width of the floating structure to engage with corresponding ones of the first support portions so that the second horizontal load is borne by the engagement portions and the corresponding first support portions.
- The first and second support portions each may comprise a frame providing a downwardly-open recess and a support block fixed in the recess to project from the frame downward.
- The cargo tank support structure may further comprise a plurality of reinforcing members provided at an inner side of the bottom of the cargo tank to extend in the longitudinal direction of the floating structure, parallel to each other, wherein the support block has a width smaller than a distance between the adjacent reinforcing members.
- The present invention also provides a method of supporting a cargo tank mounted in a hold in a floating structure, wherein a vertical load and a horizontal load applied by the cargo tank is borne by support portions all provided on the floor side of the hold.
- In the cargo tank support structure, the floating structure and the cargo tank supporting method according to the present invention, support portions bearing the vertical and horizontal loads applied by the cargo tank are all provided on the floor side of the hold, where the horizontal load is borne by the second support portion provided to continuously extend in the longitudinal direction of the floating structure. This enables the vertical and horizontal loads applied by the cargo tank to be borne by a reduced number of support portions at a reduced number of locations, and thus, enables a reduction in time taken for construction work and a reduction in construction costs. Further, omission of chocks at the ceiling means increased independence of the cargo tank, which provides increased freedom of deck design and construction, leading to a reduction in costs and wider application.
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Fig. 1 is a cross-sectional view showing a first embodiment of a cargo tank support structure according to the present invention, -
Fig. 2A is a partial enlarged view showing a first support portion of the support structure shown inFig. 1 , -
Fig. 2B is a partial enlarged view showing a second support portion of the support structure shown inFig. 1 , -
Fig. 3A is a diagram showing a bottom structure of a cargo tank, a constituent part of the support structure shown inFig. 1 , -
Fig. 3B is a diagram showing a floor structure of a hold, a constituent part of the support structure shown inFig. 1 , -
Fig. 4A is a diagram showing a bottom of a cargo tank for explaining how a horizontal load is borne in a prior-art structure, -
Fig. 4B is a diagram showing a top of a cargo tank for explaining how a horizontal load is borne in the prior-art structure, -
Fig. 5A is a diagram showing a second embodiment of the cargo tank support structure according to the present invention, -
Fig. 5B is a diagram showing a third embodiment of the cargo tank support structure according to the present invention, -
Fig. 5C is a diagram showing a fourth embodiment of the cargo tank support structure according to the present invention, -
Fig. 5D is a diagram showing a fifth embodiment of the cargo tank support structure according to the present invention, -
Fig. 6A is a diagram showing a sixth embodiment of the cargo tank support structure according to the present invention, -
Fig. 6B is a diagram showing a seventh embodiment of the cargo tank support structure according to the present invention, -
Fig. 7A is a diagram schematically showing the overall structure of a ship, an embodiment of a floating structure according to the present invention, and -
Fig. 7B is a diagram schematically showing the overall structure of off-shore floating equipment, another embodiment of the floating structure according to the present invention. - With reference to
Figs. 1 to 7 , embodiments of the present invention will be described.Fig. 1 is a cross-sectional view showing a first embodiment of a cargo tank support structure according to the present invention,Figs. 2A a partial enlarged view showing a first support portion of the support structure shown inFig. 1 ,Fig. 2B a partial enlarged view showing a second support portion thereof,Fig. 3A a diagram showing a bottom structure of a cargo tank, andFig. 3B a diagram showing a floor structure of a hold, the bottom structure and the floor structure being constituent parts of the support structure shown inFig. 1 . - For convenience in the description, the length, width and height of a floating structure 1 are chosen as X-axis, Y-axis and Z-axis, respectively, in
Figs. 1 to 3 . - As shown in
Figs. 1 to 3 , a first embodiment of a cargo tank support structure according to the present invention, designed to support acargo tank 2 mounted in ahold 11 in a floating structure 1, comprises a plurality offirst support portions 3 provided at the bottom 2a of thecargo tank 2 in a distributed manner, asecond support portion 4 provided at the bottom 2a of thecargo tank 2 to continuously extend in the longitudinal direction X of the floating structure 1, and anengagement portion 5 provided at thefloor 11a of thehold 11 along the length of thesecond support portion 4, thus in the X-direction, to engage with thesecond support portion 4, where a vertical load Fz applied by thecargo tank 2 is borne by at least thefirst support portions 3 and a horizontal load applied by the cargo tank 2 (first horizontal load Fy, in particular) is borne by at least thesecond support portion 4 and theengagement portion 5. The horizontal load can be split into a first horizontal load Fy in the width direction Y of the floating structure 1, and a second horizontal load Fx in the longitudinal direction X of the floating structure 1. - The floating structure 1 is a LNG carrier of a self-supporting prismatic type, for example. As seen in
Fig. 1 , the self-supporting prismatic LNG carrier (floating structure 1) has a double-hull 12 defining ahold 11 inside for carrying acargo tank 2. Since thecargo tank 2 is prismatic in shape, thehold 11 is also prismatic in shape. - The
hold 11 is defined by afloor 11a and aceiling 11b, thefloor 11a facing the bottom 2a of thecargo tank 2 and theceiling 1b covering the top of thecargo tank 2. In the present embodiment, theceiling 11b has no support portion bearing the horizontal load applied by thecargo tank 2. Support portions are all provided at the bottom 2a, as will be described below. - The
cargo tank 2 is designed to hold liquid cargo, such as petroleum, LPG or LNG (liquefied natural gas). The present embodiment is based on the assumption that LNG is held in the cargo tank. LNG is natural gas that has converted to liquid form by cooling it to -162°C or below, and requires maintaining at low temperature. Thus, the outer side of thecargo tank 2 is covered with aheat insulating material 21 shaped in panels. Thiscargo tank 2 is an independent type, namely constructed independently from thehull 12. - The
cargo tank 2 is mounted in thehold 11, where in order to support its own weight and reduce heat transfer from thehull 12, thecargo tank 2 has support members (first support portions 3 andsecond support portion 4, for example) at the bottom 2a, which allows the cargo tank to be mounted with the support members on thefloor 11a of thehold 11. The present invention is characterized by thiscargo tank 2 support structure. Although thecargo tank 2 has various reinforcing members on the inner side,Fig. 1 shows only those reinforcingmembers 22 provided to extend in the longitudinal direction X of thehull 12, parallel to each other. - The
first support portions 3 bear the weight of thecargo tank 2 itself, or vertical load Fz applied by thecargo tank 2. As shown inFig. 2A , thefirst support portions 3 each comprise aframe 31 providing a downwardly-open recess and asupport block 32 fixed in the recess to project from theframe 31 downward. Thesupport block 32 is fitted and fixed in theframe 31. Thesupport block 32 is made from square timber, for example, and fixed in theframe 31 by press-fitting. Thesupport block 32 may, of course, be fixed to theframe 31 with metal fastening pieces. A reinforcingmaterial 31a is provided to surround theframe 31 in an appropriate geometry. Thesupport block 32 may be a conventional support block. For example, it may be made from an elastic material having low thermal conductivity, such as rubber or resin, or square timber with a coat of such elastic material. - As seen in
Fig. 2A , at thefloor 11a of thehold 11,first seats 13 are provided to face and support thefirst support portions 3, respectively, in a manner allowing them to slide thereon. Thefirst seat 13 is a solid or hollow or symbol "#"-shaped metal portion with an approximately-flat top face. A reinforcingmaterial 13a is provided to surround thefirst seat 13 in an appropriate geometry. The cargo tank is mounted with the support blocks 32 of thefirst support portions 3 slidably seated on the top faces of thefirst seats 13. Thefirst seats 13 may be made by machining thefloor 11a of thehold 11 itself. When unnecessary, thefirst seats 13 may be omitted so that the support blocks 32 are supported directly by thefloor 11a. - As seen in
Fig. 3A , thefirst support portions 3 are arranged on both sides of the longitudinal center line L of the floating structure 1, in a manner distributed over the bottom 2a of thecargo tank 2. In the shown embodiment, thefirst support portions 3 are arrayed in two rows and eight columns on the portside as well as on the starboard side. As seen inFig. 3B , thefirst seats 13 are arranged at the locations corresponding to thefirst support portions 3. - The cargo tank support structure may be designed such that the second horizontal load Fx is borne by the
first support portions 3 while the first horizontal load Fy is borne by thesecond support portion 4 and theengagement portion 5. Specifically, as seen inFig. 3B , thefirst seats 13 in the second column from the left each have anengagement portion 15 similar in shape to theengagement portion 5, described later. Theengagement portions 15 are provided at thefloor 11a of thehold 11, along the width of the floating structure 1, thus in the Y-direction, to engage with the correspondingfirst support portions 3 so that the second horizontal load Fx is borne by theengagement portions 15 and the correspondingfirst support portions 3. The provision of theengagement portions 15 makes it possible to bear the horizontal load applied in varying magnitude and direction. Theengagement portions 15 may be provided in a desired manner; an increased number of theengagement portions 15 may be provided, and theengagement portions 15 may be provided at different locations, as compared with the example shown in the Figure. If the second horizontal load Fx is negligibly small in magnitude as compared with the first horizontal load Fy, theengagement portions 15 may be omitted. - The
second support portion 4 bears at least the horizontal load (first horizontal load Fy) applied by thecargo tank 2. While traveling or moored, the floating structure 1 experiences various motions (heave, sway, surge, pitch, yaw, roll) caused by waves, so that thecargo tank 2 applies first and second horizontal loads Fy, Fx, namely loads in the width and longitudinal directions Y, X of the hull, respectively. Thesecond support portion 4 bears the first horizontal load Fy. Floating structures having a long andthin hull 12, such as LNG carries, in particular, are likely to experience a great load in the width direction Y; the first horizontal load Fy is likely to be greater than the second horizontal load Fx. - As seen in
Fig. 2B , thesecond support portion 4 comprises aframe 41 providing a downwardly-open recess and asupport block 42 fixed in the recess to project from theframe 41 downward. Thesupport block 42 is fitted and fixed in theframe 41. Thesupport block 42 is made from square timber, for example, and fixed in theframe 41 by press-fitting. - The
support block 42 may, of course, be fixed to theframe 41 with metal fastening pieces. A reinforcingmaterial 41a is provided to surround theframe 41 in an appropriate geometry. Thesupport block 42 may be a conventional support block. For example, it may be made from an elastic material having low thermal conductivity, such as rubber or resign, or square timber with a coat of such elastic material. - As seen in
Fig. 2B , at thefloor 11a of thehold 11, asecond seat 14 is provided to face and support thesecond support portion 4. Thesecond seat 14 is a solid or hollow or symbol "#"-shaped metal portion with an approximately-flat top face. Areinforcement material 14a is provided to surround thesecond seat 14 in an appropriate geometry. - The
second seat 14 has the top face at the same level as the top faces of thefirst seats 13, on which thesupport block 42 of thesecond support portion 4 is seated. Thesecond support portion 4 thus shares the vertical load Fz applied by thecargo tank 2. By thesecond support portion 4 sharing the vertical load Fz, the load to be borne by thefirst support portions 3 is reduced, which allows a reduction in number of thefirst support portions 3 and/or a reduction in size of thefirst support portions 3. - As seen in
Fig. 2B , theengagement portion 5 is provided at thesecond seat 14. Theengagement portion 5 is formed by attaching pieces of structural steel, such as steel angle or plate, to either side of thesecond seat 14 in the longitudinal direction X, by welding or other process. Theengagement portion 5 may be formed by attaching the pieces of structural steel to either the top or the sides of thesecond seat 14. Theengagement portion 5 provided this way can bear the first horizontal load Fy, restricting the movement of thesupport block 42 on thesecond seat 14 in the width direction Y - As seen in
Fig. 3A , thesecond support portion 4 is provided to extend on the longitudinal center line L of the floating structure 1 in the X-direction. As seen inFig. 3B , also thesecond seat 14 and theengagement portion 5 extend on the longitudinal center line L of the floating structure 1 in the X-direction. Thesecond support portion 4 and theengagement portion 5, both extending long in the longitudinal direction X, provide a pressure-receiving area great enough to bear the first horizontal load Fy. - Although in the shown embodiment, the
engagement portion 5 extends in the X-direction over the entire length of thesecond seat 14, theengagement portion 5 may have any length enough to bear the expected magnitude of the first horizontal load Fy. Theengagement portion 5 may be made of separate longitudinal portions arranged in the longitudinal direction X. -
Figs. 4A and4B are diagram showing a bottom and a top of a cargo tank, respectively, for explaining how a horizontal load is borne in a prior-art support structure. - As seen in
Figs. 4A and4B , in the prior art, thecargo 20 tank support structure typically comprises a plurality of tanks supports 30 provided at the bottom 20a of thecargo tank 20 in a distributed manner, and a plurality ofanti-roll chocks 40 provided at the top 20b of thecargo tank 20 on the longitudinal center line L of the hull. Thecargo tank 20 is mounted with the tank supports 30 on the hold floor and with theanti-roll chocks 40 engaged with engagement portions provided at the hold ceiling. Thus, the vertical load applied by thecargo tank 20 is borne by the tank supports 30, and the horizontal load by the anti-roll chocks 40 and some of the tank supports 30. Thecargo tank 20 has atank dome 20c at the top, which provides access to the inside of the cargo tank for carrying in and out LNG and for tank maintenance. - The above-described prior-art support structure having the support members (tank supports 30 and anti-roll chocks 40) at both the bottom 20a and the top 20b of the cargo tank has a drawback such that construction of the floating structure as well as construction of the
cargo tank 20 takes much time. The present embodiment, by contrast, has a portion functioning as anti-roll chocks at the bottom 2a of thecargo tank 2. Specifically, the present embodiment is a method of supporting acargo tank 2 mounted in ahold 11 in a floating structure 1, wherein the horizontal load (first horizontal load Fy and second horizontal load Fx) as well as the vertical load Fz applied by thecargo tank 2 is borne by support portions all provided on thefloor 11a side of thehold 11. The present embodiment thus does not require that support portions bearing the horizontal load (first horizontal load Fy and second horizontal load Fx) applied by thecargo tank 2 be provided at the top of thecargo tank 2. The present embodiment thus allows a reduction in number of locations at which to provide support members and a reduction in size of support members, which leads to reduced time taken for construction work. - As seen in
Fig. 3A , thesecond support portion 4 extending linearly and continuously in the longitudinal direction X leads to simple arrangement ofheat insulating material 2 around it, as compared with the prior art in which the heat insulating material needs to be arranged to surround each of the separate tank supports 30 provided in a distributed manner in the area of thesecond support portion 4. This also leads to reduced time taken for construction work. - Next, other embodiments of the cargo tank support structure according to the present invention will be described.
Figs. 5A to 5D show second to fifth embodiments of the cargo tank support structure according to the present invention, respectively, andFigs. 6A and6B show sixth and seventh embodiments of the cargo tank support structure according to the present invention, respectively. Those components which are similar to components of the first embodiment are denoted by the same reference characters, and the description thereof will be omitted. - In the second to fifth embodiments shown in
Figs. 5A to 5D , thefirst support portions 3 and/or thesecond support portion 4 is provided in an altered arrangement.Figs. 5A to 5D each show the bottom 2a of thecargo tank 2 in a manner comparable toFig. 3A . - In the second embodiment shown in
Fig. 5A , thesecond support portion 4 is divided into parts. Although in the shown example, thesecond support portion 4 is divided into two parts, it may be divided into three or more parts. - Dividing the
second support portion 4 into parts provides a passage between the adjacent parts, through which a worker can come and go between the opposite sides of thesecond support portion 4. This is convenient for maintenance work and others. - In the third embodiment shown in
Fig. 5B , thesecond support portion 4 is provided to extend in the longitudinal direction X, off the longitudinal center line L. Although it is normally desirable to arrange thesecond support portion 4 on the longitudinal center line L, thesecond support portion 4 may be arranged on any longitudinal line other than the longitudinal center line as in the third embodiment, to suit the expected horizontal load, which varies depending on ship type, cargo, shipping route and others. - In the fourth embodiment shown in
Fig. 5C , thesecond support portion 4 includes a part arranged on another longitudinal line than the longitudinal center line L. - Specifically, the
second support portion 4 is divided into three parts, of which themiddle one 4 is arranged on a longitudinal line near a longitudinal edge of the bottom 2a of thecargo tank 2 and the other two 4 are arranged on the longitudinal center line L. Thesecond support portion 4 may be provided in a distributed manner as in the fourth embodiment to suit the expected horizontal load, which varies depending on ship type, cargo, shipping route and others, within the constraints on arrangement imposed by the hull. - In the fifth embodiment shown in
Fig. 5D , thefirst support portions 3 are approximately rectangular in shape. - Although in the shown example, the
first support portion 3 has a greater size in the width direction Y of the floating structure than in the longitudinal direction X thereof, thefirst support portion 3 may have a greater size in the longitudinal direction X than in the width direction Y. - This type of
first support portion 3 is provided, as it were, by combining some conventionalfirst support portions 3 into one. Choosing the rectangular shape in place of the square shape makes it possible to reduce the number ofsupport portions 3 while providing the pressure-receiving area enough to bear the vertical load Fz, leading to a reduction in time taken for construction work. - In the sixth and seventh embodiments shown in
Figs. 6A and6B , thesecond support portion 4 has an altered structure. -
Figs. 6A and6B each show thesecond portion 4 in a manner comparable toFig. 2B . - In the sixth embodiment shown in
Fig. 6A , thesecond seat 14 is omitted. Thesecond seat 14 can be omitted, for example when thefirst seats 13 are omitted or when thesecond support 4 is not intended to bear the vertical load Fz. As seen in the Figure, theengagement portion 5 is provided directly at thefloor 11a of thehold 11. A reinforcingmaterial 5a may be provided on the outer side of theengagement portion 5. In the shown example, thesecond support portion 4 is not intended to bear the vertical load Fz (the vertical load Fz is borne only by the first support portions 3), and thus, theblock 42 is not in contact with thefloor 11a of thehold 11. It may be altered such that theblock 42 is in contact with thefloor 11a so that thesecond support portion 4 shares the vertical load Fz. - In the seventh embodiment shown in
Fig. 6B , thecargo tank 2 has a plurality of reinforcingmembers 22 provided on the inner side of the bottom to extend in the longitudinal direction X, parallel to each other, where thesupport block 42 has a width Yb smaller than the distance Yg between the adjacent reinforcingmembers heat insulating material 21, and thus, provide improved cold storage performance. When theheat insulating material 21 is shaped in panels, thesecond support portion 4 is easily provided between the panels. Thesecond support portion 4 of this type can therefore reduce the area not covered with theheat insulating material 21, and at the same time facilitates application of theheat insulating material 21. - This feature is applicable to the
first support portions 3. Last, embodiments of a floating structure 1 according to the present invention will be described.Fig. 7A is a diagram schematically showing the overall structure of a ship, an embodiment of a floating structure according to the present invention, andFig. 7B shows off-shore floating equipment, another embodiment of the floating structure. - The floating structures 1 shown in
Figs. 7A and7B each comprise amain body 1a floating by being supported by a buoyant force, themain body 1a having ahold 11 withcargo tanks 2 mounted in. Specifically, the floating structure 1 shown inFig. 7A is a self-supporting prismatic LNG carrier, and themain body 1a is ahull 12. The floating structure 1 is not restricted to the LNG carrier; it may be a petroleum tanker, an LPG carrier, a chemical tanker or the like although it needs to be a vessel designed to carry self-supportingprismatic cargo tanks 2. - The floating structure 1 shown in
Fig. 7B is offshore-floating self-supporting prismatic LNG equipment exemplified by an FPSO (floating production, storage and offloading system). The FPSO is a floating structure 1 moored offshore bymooring cable 1b, havingLNG production equipment 1c on the deck, wherein the LNG produced is stored incargo tanks 2 within the FPSO until offloaded onto a carrier. The FPSO may be designed for processing petroleum or LPG. If the production of such fuel is not intended, the floating structure 1 may be an FSO (floating storage and offloading system) which is offshore floating equipment not comprisingproduction equipment 1c. The FSO is designed to only store and offload fuel. - The floating structure 1 has
cargo tanks 2 independent from themain body 1a, and thecargo tanks 2 are supported with the support structure according to the present invention, exemplified by the above-described first to seventh embodiments, and thus, the support portions bearing the vertical load Fz and horizontal load (first horizontal load Fy and second horizontal load Fx) applied by thecargo tank 2 are all provided on thefloor 11a side of thehold 11. - This makes it possible to reduce the number of support members and the number of locations at which to provide support members, leading to reduced time taken for and reduced costs of constructing the floating structure 1.
- In the above description of the
cargo tank 2 support structure, the floating structure 1 and the method of supporting thecargo tank 2, the "vertical load" is a load acting vertically on the floating structure 1 buoyed by static water, and the "horizontal load" is a load acting horizontally on the floating structure 1 buoyed by static water. The frame of reference within which these loads are measured may be either a relative coordinate system varying depending on oscillation of the floating structure 1 or an absolute coordinate system fixed irrespective of oscillation of the floating structure 1. - The present invention is not restricted to the described embodiments, which can be altered in various ways without departing from the scope of the present invention. For example, the present invention is applicable to floating structures 1 having anti-floatation chocks and floating structures 1 not having a
ceiling 11b of ahold 11 covering acargo tank 2. -
- 1
- Floating structure
- 1a
- Main body
- 2
- Cargo tank
- 2a
- Bottom
- 3
- First support portion
- 4
- Second support portion
- 5
- Engagement portion
- 11
- Hold
- 11a
- Floor
- 11b
- Ceiling
- 13
- First seat
- 14
- Second seat
- 15
- Engagement portion
- 22
- Reinforcing member
- 31, 41
- Frame
- 32, 42
- Support block
Claims (10)
- A floating structure (1) comprising a cargo tank (2) and a cargo tank support structure for supporting the cargo tank (2) mounted in a hold (11) in the floating structure (1), the cargo tank support structure comprising:a plurality of first support portions (3) provided at a bottom (2a) of the cargo tank (2) in a distributed manner,a second support portion (4) provided at the bottom (2a) of the cargo tank (2), andan engagement portion (5) provided at a floor (11a) of the hold (11) along the length of the second support portion (4) to engage with the second support portion (4), wherein when a load is applied by the cargo tank (2), at least the first support portions (3) bear a vertical load (Fz) and at least the second support portion (4) and the corresponding engagement portion (5) bear a horizontal load (Fy) in both width directions of the floating structure (1), and characterized in that the second support portion continuously extend in a longitudinal direction of the floating structure (1) and that the horizontal load is split into a first horizontal load (Fy) in a width direction of the floating structure (1) and a second horizontal load (Fx) in the longitudinal direction of the floating structure (1), the first horizontal load (Fy) being borne by the second support portion (4) and the corresponding engagement portion (5), and the second horizontal load (Fx) being borne by the first support portions (3).
- The floating structure (1) according to claim 1, wherein the second support portion (4) is provided along the longitudinal center line (L) of the floating structure (1).
- The floating structure (1) according to claim 1, wherein the hold (11) has a ceiling (11b) covering the cargo tank (2), the ceiling (11b) having no support portion bearing the horizontal load applied by the cargo tank (2).
- The floating structure (1) according to claim 1, wherein the second support portion (4) is adapted to bear the vertical load (Fz) applied by the cargo tank (2).
- The floating structure (1) according to claim 4, further comprising first seats (13) and a second seat (14) provided at the floor (11a) of the hold (11), the first seats (13) being adapted to support the first support portions (3) in a manner allowing the first support portions (3) to slide thereon, and the second seat (14) being adapted to support the second support portion (4), wherein the engagement portion (5) is provided at the second seat (14).
- The floating structure (1) according to claim 1, further comprising engagement portions (15) provided at the floor (11a) of the hold (11) along the width of the floating structure (1) to engage with corresponding ones of the first support portions (3) so that the second horizontal load (Fx) is borne by the engagement portions (15) and the corresponding first support portions (3).
- The floating structure (1) according to claim 1, wherein the first and second support portions (3, 4) each comprise a frame (31, 41) providing a downwardly-open recess and a support block (32, 42) fixed in the recess to project from the frame (31, 41) downward.
- The floating structure (1) according to claim 7, further comprising a plurality of reinforcing members (22) provided at an inner side of the bottom of the cargo tank (2) to extend in the longitudinal direction of the floating structure (1), parallel to each other, wherein the support block (32, 42) has a width (Yb) smaller than a distance (Yg) between the adjacent reinforcing members (22).
- The floating structure (1) according to any of claims 1 to 8, wherein the second support portion (4) is divided into parts and the engagement portion (5) is made of separate portions.
- The floating structure (1) according to any of claims 1 to 9, comprising a main body (1a) floating by being supported by a buoyant force, the main body (1a) having the hold (11) with the cargo tank (2) mounted in, wherein
the cargo tank (2) is supported with the cargo tank support structure.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL11819942T PL2610161T3 (en) | 2010-08-24 | 2011-08-24 | Support structure for cargo tank, floating structure, and support method for cargo tank |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010187181A JP5646913B2 (en) | 2010-08-24 | 2010-08-24 | Cargo tank support structure and floating structure |
PCT/JP2011/069008 WO2012026479A1 (en) | 2010-08-24 | 2011-08-24 | Support structure for cargo tank, floating structure, and support method for cargo tank |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2610161A1 EP2610161A1 (en) | 2013-07-03 |
EP2610161A4 EP2610161A4 (en) | 2015-01-21 |
EP2610161B1 true EP2610161B1 (en) | 2019-10-09 |
Family
ID=45723473
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11819942.1A Active EP2610161B1 (en) | 2010-08-24 | 2011-08-24 | Support structure for cargo tank, floating structure, and support method for cargo tank |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP2610161B1 (en) |
JP (1) | JP5646913B2 (en) |
KR (1) | KR101440366B1 (en) |
CN (1) | CN103228529B (en) |
ES (1) | ES2763430T3 (en) |
PL (1) | PL2610161T3 (en) |
WO (1) | WO2012026479A1 (en) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014162430A (en) * | 2013-02-27 | 2014-09-08 | Mitsubishi Heavy Ind Ltd | Tank structure placed on deck, and installation method therefor |
JP2014201241A (en) * | 2013-04-08 | 2014-10-27 | 信吉 森元 | Lng carrier |
BR112015025794A2 (en) * | 2013-04-23 | 2017-07-25 | Kawasaki Heavy Ind Ltd | Liquefied gas tanker and carrier tank support structure |
KR101422624B1 (en) * | 2013-10-29 | 2014-07-23 | (주)건양선박설계 | Supporting Device for Independent Cargo Tank comprising Jack and Transporting Tanker having the same |
KR101591781B1 (en) | 2014-08-06 | 2016-02-04 | 한국가스공사 | Pump tower of liquified gas storage tank |
WO2016059661A1 (en) * | 2014-10-16 | 2016-04-21 | 川崎重工業株式会社 | Ship tank support structure |
CN105570682B (en) * | 2014-11-07 | 2019-10-18 | 中集船舶海洋工程设计研究院有限公司 | Liquid goods tank and LNG ship |
JP5968985B2 (en) * | 2014-12-01 | 2016-08-10 | ジャパンマリンユナイテッド株式会社 | Tank support structure and ship |
CN104986287B (en) * | 2015-06-16 | 2018-04-24 | 沪东中华造船(集团)有限公司 | Large LNG ship Type B containment system only shakes device |
KR102277373B1 (en) * | 2017-11-14 | 2021-07-15 | 현대중공업 주식회사 | Tank support structure and ship with the same |
KR102160862B1 (en) * | 2018-12-28 | 2020-09-28 | 현대중공업 주식회사 | Liquefied Gas Carrier |
KR102608693B1 (en) * | 2019-01-29 | 2023-12-01 | 한화오션 주식회사 | Lower barrier structure of independence type storage tank |
CN110562394B (en) * | 2019-09-11 | 2021-04-30 | 浙江海洋大学 | Be applied to high stability goods shelves of boats and ships |
KR102257722B1 (en) * | 2020-02-21 | 2021-05-28 | 주식회사 현대미포조선 | Support structure for an independence type storage tank |
Citations (1)
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US3064612A (en) * | 1960-10-20 | 1962-11-20 | Maryland Shipbuilding And Dryd | Carrier constructions for bulk fluids |
Family Cites Families (8)
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FR1317043A (en) * | 1961-03-10 | 1963-02-01 | Wm Cory & Son | Improvement of vessel tank supports for the transport of refrigerated liquids |
JPS5013492B1 (en) * | 1970-05-15 | 1975-05-20 | ||
JPS595492U (en) | 1982-07-05 | 1984-01-13 | 三菱重工業株式会社 | Tank support structure for liquefied gas carriers, etc. |
JP3398723B2 (en) * | 1993-12-01 | 2003-04-21 | 株式会社アイ・エイチ・アイ マリンユナイテッド | Self-supporting rectangular tank for liquid carrier and supporting device therefor |
JP2000177681A (en) * | 1998-12-15 | 2000-06-27 | Mitsubishi Heavy Ind Ltd | Independent tank support system |
DE102005057451A1 (en) * | 2005-12-01 | 2007-06-14 | Tge Gas Engineering Gmbh | Device for storing a tank in a ship |
NO327766B1 (en) * | 2006-06-19 | 2009-09-21 | Tanker Engineering As | Cylindrical tank and method of manufacture thereof |
KR200456049Y1 (en) * | 2008-11-14 | 2011-10-10 | 대우조선해양 주식회사 | Insulation structure of independent type cargo tank in LPG carrier |
-
2010
- 2010-08-24 JP JP2010187181A patent/JP5646913B2/en active Active
-
2011
- 2011-08-24 EP EP11819942.1A patent/EP2610161B1/en active Active
- 2011-08-24 PL PL11819942T patent/PL2610161T3/en unknown
- 2011-08-24 KR KR1020137007567A patent/KR101440366B1/en active IP Right Grant
- 2011-08-24 WO PCT/JP2011/069008 patent/WO2012026479A1/en active Application Filing
- 2011-08-24 CN CN201180051240.9A patent/CN103228529B/en active Active
- 2011-08-24 ES ES11819942T patent/ES2763430T3/en active Active
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US3064612A (en) * | 1960-10-20 | 1962-11-20 | Maryland Shipbuilding And Dryd | Carrier constructions for bulk fluids |
Also Published As
Publication number | Publication date |
---|---|
WO2012026479A1 (en) | 2012-03-01 |
ES2763430T3 (en) | 2020-05-28 |
CN103228529B (en) | 2018-04-06 |
JP2012045980A (en) | 2012-03-08 |
EP2610161A4 (en) | 2015-01-21 |
KR20130079513A (en) | 2013-07-10 |
EP2610161A1 (en) | 2013-07-03 |
PL2610161T3 (en) | 2020-05-18 |
KR101440366B1 (en) | 2014-09-15 |
CN103228529A (en) | 2013-07-31 |
JP5646913B2 (en) | 2014-12-24 |
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