KR101415073B1 - Cargo for liquefied gas carrier ship - Google Patents

Abstract

A cargo hold of a liquefied gas transportation vessel including an adiabatic panel laminated is disclosed. A cargo hold of a liquefied gas carrier according to an embodiment of the present invention includes a main wall enclosing an accommodating space in which liquefied gas is received, an upper adiabatic panel structure surrounding the main wall, a lower adiabatic panel structure surrounding the upper adiabatic panel structure, An auxiliary wall positioned between the upper insulating panel structure and the lower insulating panel structure and an outer wall surrounding the lower insulating panel structure, and a coupling unit for coupling the upper insulating panel structure, the auxiliary barrier, and the lower insulating panel structure in the z- .

Description

{CARGO FOR LIQUEFIED GAS CARRIER SHIP}

The present invention relates to a cargo hold of a liquefied gas transportation vessel, and more particularly to a cargo hold of a liquefied gas transportation vessel including a laminated heat insulating panel.

Liquefied gas refers to a colorless transparent cryogenic liquid that reduces the volume of methane-based natural gas to -162 ° C and reduces its volume by one-sixth.

As such liquefied gas is used as an energy source, an efficient transportation method that can transport a large amount from the production base to the place of purchase of the demand site has been examined in order to utilize this gas as energy. As a part of this effort, A liquefied gas transport vessel capable of being transported by sea was developed.

However, the liquefied gas transportation vessel is required to have a cargo that can store and store the liquefied gas liquefied at an extremely low temperature.

That is, since the liquefied gas has a vapor pressure higher than atmospheric pressure and has a boiling temperature of approximately -162 ° C, in order to safely store and store such a liquefied gas, the cargo window storing the liquefied gas is a material which can withstand extremely low temperatures, It should be made of aluminum steel, stainless steel, 35% nickel steel, etc. It should be designed with a unique insulation panel structure which is resistant to thermal stress and heat shrinkage and prevents heat intrusion.

The cargo hold of the liquefied natural gas transportation vessel includes a kitchen wall surrounding an accommodation space in which the liquefied gas is received, an insulation panel assembly surrounding the kitchen wall, and an outer wall surrounding it.

Usually, the outer wall is made of a hull. In order to improve the heat insulation performance and improve the airtightness, the heat insulating panel assembly usually has a structure in which two-layer heat insulating panels are laminated. An auxiliary barrier is also provided between the lower insulation panel and the upper insulation panel in case the main wall is broken. At this time, an auxiliary panel may be installed above and below the auxiliary barrier to facilitate installation of the auxiliary barrier.

Thermal stress due to the difference in heat shrinkage occurs between the insulating panel, the auxiliary panel and the auxiliary barrier. This thermal stress is responsible for the deformation of the cargo hold and weakens the airtightness. Various techniques have been developed to overcome such thermal stresses.

Korean Patent Registration No. 10-0748819 discloses a heat insulating plate fixing device for a LNG carrier holding case.

[Patent Literature]

Korean Registered Patent No. 10-0748819 (published on Aug. 13, 2007)

An embodiment of the present invention seeks to provide a cargo hold of a liquefied gas carrier capable of eliminating thermal stress between the auxiliary barrier and the upper or lower insulation panel structure.

Another object of the present invention is to provide a cargo hold of a liquefied gas transportation vessel capable of reducing frictional force when a block is slidingly moved using a spacer.

According to an aspect of the present invention there is provided a method of manufacturing a lower insulation panel structure, comprising the steps of: forming a cavity wall surrounding a containment space in which liquefied gas is contained, an upper insulation panel structure surrounding the kitchen wall, a lower insulation panel structure surrounding the upper insulation panel structure, A cargo hold of a liquefied gas carrier, comprising an outer wall surrounding the structure, comprising: an auxiliary barrier positioned between the upper and lower insulation panel structures; And a coupling unit coupling the upper insulating panel structure, the auxiliary barrier, and the lower adiabatic panel structure in the z-axis direction.

The coupling unit may include a block inserted into a depression formed on an upper surface of the lower adiabatic panel structure; A fixed piece for restricting z-axis movement of the block; An engaging member connected to the block and penetrating a portion of the lower portion of the upper heat-insulating panel structure to couple the block and the upper heat-insulating panel structure in a z-axis direction by a nut tightening; And a spacer positioned between the nut and the block to maintain a predetermined distance between the nut and the block. The cargo hold of the liquefied gas transportation vessel may be provided.

The block may include a liquefied gas-conveying vessel, which is spaced apart from the z-axis and perpendicular to the z-axis, and which is coupled with the auxiliary barrier and is movable in a direction perpendicular to the z-axis in accordance with thermal contraction or thermal expansion of the auxiliary barrier, Can be provided.

The lower insulation panel structure may further include a lower sub-panel between the lower insulation panel and the auxiliary barrier, wherein the upper insulation panel structure further comprises an upper sub-panel between the upper insulation panel and the auxiliary barrier, A cargo hold of a liquefied gas transportation vessel formed on the lower sub-panel may be provided.

In addition, the combination of the auxiliary barrier and the block may be provided with a cargo hold of a liquefied gas transportation vessel which is a welded joint.

The cargo hold of the liquefied gas transportation vessel provided with the screw has a hole, a screw is formed on the outer surface of the hole, and the engaging member penetrates the upper adiabatic panel structure and is fastened to the thread of the block .

Further, the fixing piece may be provided with a cargo hold of a liquefied gas transportation vessel having a latching jaw which is engaged with the lower adiabatic panel structure and covers a part of the block to prevent the block from deviating in the z-axis direction .

Further, the block may be provided with a cargo hold of a liquefied gas-transporting vessel having a circular cross-section perpendicular to the z-axis or a donut-shaped cross section, the ring-shaped ring including the block.

The cargo hold of the liquefied gas transportation vessel according to the embodiment of the present invention may be constructed such that the lower insulation panel structure and the upper insulation panel structure are combined using the coupling unit without adhering the auxiliary barrier and the auxiliary panel, Stress can be relieved.

In addition, the block of the coupling unit is coupled with the auxiliary barrier, and the block is vertically spaced apart from the z-axis so that the block connected thereto can move in a direction perpendicular to the z axis according to thermal shrinkage or thermal expansion of the auxiliary barrier, .

Further, in order to prevent the frictional force of the block from increasing by tightly coupling the block, the frictional force can be reduced when the block is slidingly moved by using the spacer.

In addition, air tightness can be achieved by welding the auxiliary barrier and the block.

1 is a sectional view showing a cargo hold of a liquefied gas transportation vessel.
2 is an assembled cross-sectional view of an insulating panel assembly according to an embodiment of the present invention.
3 is a part view of a coupling unit according to an embodiment of the present invention.
4 is a perspective view showing a moving state of the coupling unit according to the embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments described below are provided by way of example so that those skilled in the art will be able to fully understand the spirit of the present invention. The present invention is not limited to the embodiments described below, but may be embodied in other forms. In order to clearly explain the present invention, parts not related to the description are omitted from the drawings, and the width, length, thickness, etc. of the components may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

1 is a sectional view showing a cargo hold of a liquefied gas transportation vessel. FIG. 2 is an assembled cross-sectional view of an insulating panel assembly according to an embodiment of the present invention, and FIG. 3 is a part view of a coupling unit according to an embodiment of the present invention.

The cargo hold of the liquefied gas receiving vessel according to the embodiment of the present invention includes a main wall 10 surrounding an accommodation space in which liquefied gas is received, an insulation panel assembly 20 surrounding the main wall 10, 20 which surround the outer wall 30.

The heat insulating panel structure disposed in the direction (downward or -z direction) in which the outer wall 30 is positioned with respect to the auxiliary barrier 500 is referred to as a lower heat insulating panel structure 21, (Upward or + z direction) in which the heat sink 10 is located is referred to as an upper heat insulating panel structure 22.

The lower insulating panel structure 21 may be coupled to the outer wall 30 by a mastic or the like and may include a lower auxiliary panel 200 fixed to the lower insulating panel 100 and the + can do. The upper insulating panel structure 22 includes an upper auxiliary panel 600 located on the + z direction surface of the auxiliary barrier 500 and an upper insulating panel 700 fixed on the + z direction surface of the upper auxiliary panel 600 can do. An auxiliary barrier 500 is located between the lower insulating panel structure 21 and the upper insulating panel structure 22.

Generally, the heat insulating panel is made of a lightweight material such as a polyurethane foam which is excellent in heat insulation performance. An auxiliary barrier 500 is provided between the lower insulating panel 100 near the outer wall 30 and the upper insulating panel 700 close to the kitchen wall 10 in the case where the kitchen wall 10 allows outside entry Located. At this time, the amount of heat shrinkage differs between the auxiliary barrier 500 and the heat insulating panel, and thermal stress is generated. This thermal stress leads to poor contact of the secondary barrier 500, which is a threat to airtightness. It is very important to eliminate the thermal stress generated between the elements of the heat insulating panel assembly 20 made of different materials.

The auxiliary panels 200 and 600 can be inserted between the heat insulating panels 100 and 700 and the auxiliary barrier 500 to reduce thermal stress and improve airtightness. That is, the lower sub-panel 200 is fixed to the lower heat-insulating panel 100, and the upper sub-panel 600 is fixed to the upper heat- The auxiliary panel may be usually plywood or the like, and the auxiliary barrier 500 may be made of SUS or the like.

The auxiliary barrier 500 inserted between the lower sub-panel 200 and the upper sub-panel 600 can be joined to the sub-panels 200 and 600 on both sides by adhesion or the like. However, in this case, heat shrinkage amounts of the auxiliary panels 200 and 600 and the auxiliary barrier 500 are different, and thermal stress is generated in the direction perpendicular to the z axis, which causes adhesion failure of the auxiliary barrier 500. Such poor adhesion can cause breakage of the heat insulating panel assembly 20 or weaken airtightness.

The heat insulating panel assembly 20 according to the embodiment of the present invention may not bond between the auxiliary panels 200 and 600 and the auxiliary barrier 500. The lower insulation panel structure 21 and the upper insulation panel 700 structure 22 are mechanically coupled using the coupling unit 23 in order to couple without bonding.

The coupling unit 23 maintains the airtightness of the auxiliary barrier 500 while coupling the lower and the upper adiabatic panel structures 21 and 22 so that the auxiliary barrier 500 does not move in a direction perpendicular to the z axis The block 300 and the securing piece 400 to permit movement of the block 300 to a predetermined position.

The block 300 is inserted into the first depression 210 formed on the + z direction surface (upper surface) of the lower sub panel 200 and is coupled to the auxiliary barrier 500 by welding or the like (see A in FIG. 3) do. The reason for being coupled by the method of welding or the like is to keep airtightness by being continuously connected with the auxiliary barrier 500. It is preferable that the first depressed portion 210 does not pass through the lower sub-panel 200. The bottom insulating panel 100 may be exposed when the coupling A between the auxiliary barrier 500 and the block 300 is penetrated, which means that the airtightness is weakened.

When the lower insulation panel structure 21 does not include the lower sub-panel 200, the first sub-recess 210 is formed in the lower sub-panel 200, Or may be formed directly on the lower insulating panel 100.

When the block 300 is inserted into the first depression 210, the block 300 is spaced apart from the first depression 210 in the direction perpendicular to the z-axis (or x-y plane direction). When the auxiliary barrier 500 is thermally contracted or thermally expanded through the spaced spaces, the block 300 is capable of sliding movement in the direction of contraction or expansion of the auxiliary barrier 500. The contraction range of the auxiliary barrier 500 is calculated and the width of the first depression 210 is determined so that the block 300 and the lower sub-panel 200 are spaced apart in the x-y plane direction by the resultant value.

The first depressed portion 210 and the block 300 may have a cylindrical shape or a circular cross-sectional shape perpendicular to the z-axis. That is, the diameter of the first depression 210 in the x-y plane direction is larger than the diameter of the auxiliary barrier 500 in the xy plane direction or larger than the diameter of the auxiliary barrier 500 in the xy plane. In the case of a circular shape, it is possible to slide evenly along the shrinkage direction and it is easy to manufacture.

The height of the central portion 320 and the peripheral portion 330 of the block 300 may be different from each other. The center portion 320 is coupled to the auxiliary barrier 500 and the peripheral portion 330 is prevented from being separated from the block 300 in the + z direction by the fixing piece 400 coupled with the lower sub- .

The lower sub-panel 200 can create a second depression 220 around the first depression 210. [ The second depression 220 includes a first depression 210 at the center and a wider recess in the direction perpendicular to the z axis than the first depression 210. Also, the depth may be shallower than the first depression 210. Of course, the shape of the second depression 220 can be changed according to the shape of the fixing piece 400. When the second depressed portion 220 has the same depth as the first depressed portion 210, the fixing piece 400 may be formed with a locking protrusion that covers the peripheral portion 330 of the block 300.

The block 300 is inserted into the first depression 210 and then the fixing piece 400 is inserted into the second depression 220 and coupled with the lower sub panel 200. At this time, the fixing may be performed by bolts or rivets 410 and may be performed by adhesion. Hereinafter, bonding and adhesion by bolts or rivets 410 are collectively referred to as bonding.

The auxiliary barrier 500, the block 300, and the fixing piece 400 may be made of the same material. Therefore, it is paradoxical to connect the lower sub-panel 200 and the fixing member 400, as compared with the case where the sub-barrier 500 and the lower sub-panel 200 are not bonded. However, since the area of the joint between the fixing member 400 and the lower sub-panel 200 is very small, the degree of deformation due to thermal stress is small and bonding is possible. In contrast, since the auxiliary barrier 500 and the lower sub-panel 200 are in contact with the front surface of the lower adiabatic panel structure 21, the occurrence of thermal stress is greatly increased when these surfaces are bonded. It is also conceivable to combine with the bolt or rivet 410 for a more rigid connection.

The shape of the fixing piece 400 may be the shape of a hollow ring. A central portion 320 of the block 300 is located at the hollow portion and a peripheral portion 330 of the block 300 is located below the annular surface. That is, the peripheral portion 330 of the block 300 is positioned between the fixing piece 400 and the lower sub-panel 200. Therefore, the movement of the block 300 in the + z direction is restricted by the fixed fixing piece 400.

The fixing part 400 and the peripheral part 330 of the block 300 may be in contact with each other or spaced apart by a predetermined distance. However, since the block 300 may be shaken in the z-axis direction as much as the spacing, the structural stability of the heat insulating panel assembly 20 may be deteriorated. Conversely, if the fixing part 400 and the peripheral part 330 of the block 300 are in close contact with each other, the free movement of the block 300 can be restricted.

The central portion 320 of the block 300 has a height corresponding to the + z direction of the lower sub-panel 200 and the peripheral portion 330 has a height corresponding to the second recess And has a height corresponding to the depth of the portion 220. In this case, the corresponding height does not mean the same height.

Generally, the plywood used as the material of the lower sub-panel 200 has a greater degree of shrinkage in the z-axis direction at the cryogenic temperature as compared with the metal that can be used as the material of the block 300 and the fixing piece 400. The height of the fixing piece 400 is lower than the height of the center portion 320 of the lower sub-panel 200 in the + z direction and is lower than the height corresponding to the depth of the second depressed portion 220, (330) is lowered. When the height is made equal to the height, the lower sub-panel 200 made of plywood shrinks in the z-axis direction so that the height of the blocks 300 and the fixing pieces 400 becomes relatively higher, thereby applying pressure to the auxiliary barrier 500 To prevent thermal stress from occurring or to weaken the bond between the lower insulating panel structure (21) and the upper insulating panel structure (22).

The coupling member 800 is a member for coupling the block 300 and the upper sub-panel 600 in the z-axis direction. The block 300 is joined to the auxiliary barrier 500 by welding or the like and is coupled to the lower sub-panel 200 in the z-axis direction by the fixing piece 400. Accordingly, the coupling member 800 joins the lower sub-panel 200 and the upper sub-panel 600 in the z-axis direction via the block 300, and as a result, the lower and upper insulation panel structures 21, (22).

The coupling member 800 is connected to the block 300 and connects the upper sub-panel 600 and the block 300 by tightening the nut 830 through the upper sub-panel 600. Associating with the block 300 includes coupling with the block 300 as a separate member as well as being formed integrally with the block 300.

The mating member 800 according to an embodiment of the present invention may include a stud bolt 810 coupled to the block 300. A hole may be formed in the center of the block 300 and a threaded hole 310 may be formed on the outer surface of the hole. A stud bolt 810 can be inserted into the threaded hole 310 through the upper and lower auxiliary panels 600 and 500. The washer 820 and the nut 830 can be fastened to the + z-axis surface of the upper sub-panel 600. At this time, it is also possible to form a groove in the upper sub-panel 600 for insertion of the washer 820.

The washer 820 and the nut 830 are fastened to the upper and lower sub-panels 600 and 600. However, when the upper sub-panel 600 is not interposed, As well as the engagement member 800, as shown in FIG.

The coupling unit 23 according to the embodiment of the present invention may include a spacer 900 positioned between the nut 830 and the block 300 to maintain a constant distance.

The spacing between the upper and lower sub-panels 600 and 300 becomes narrower as the nut 830 is tightened. When the block is tightened excessively, the auxiliary barrier 500 (500) interposed between the block 300 and the upper sub- Is subjected to the pressure by the tightening of the nut 830. Accordingly, movement can be restricted not only in the auxiliary barrier 500 but also in the direction perpendicular to the z axis of the block 300. [ This obstructs the object of the present invention to solve the thermal stress due to thermal contraction or thermal expansion of the auxiliary barrier 500. The auxiliary barrier 500 and the auxiliary barrier 500 are maintained at a constant interval between the block 300 and the upper sub- It is preferable to allow the free movement of the block 300.

Spacer 900 may be positioned between washer 820 and block 300 for this purpose. As a result, the spacer 900 is positioned between the nut 830 and the block 300 and serves to maintain a constant distance between the two members, and can be included in the embodiment of the present invention regardless of its shape . In accordance with an embodiment of the present invention, a hollow spacer 900 is shown.

A method of joining the heat insulating panel assembly 20 according to an embodiment of the present invention will be described. The block 300 is inserted into the first depression 210 formed in the lower sub-panel 200 after the lower adiabatic panel structure 21 is installed on the outer wall 30. The fixing member 400 is inserted into the second depression 220 formed in the lower subpanel 200 and the fixing member 400 is coupled with the lower subpanel 200 using the rivet 410 or the like. By this combination, the block 300 is coupled with the lower sub-panel 200 in the z-axis direction and is not separated.

The auxiliary barrier 500 is positioned on the lower sub-panel 200 and the hole corresponding to the block 300 formed on the auxiliary barrier 500 is aligned with the position of the block 300. Then, the auxiliary barrier 500 and the block 300 are joined by welding or the like. At this time, the airtightness of the auxiliary barrier 500 is determined by coupling with the block 300, and therefore, it is necessary to work carefully with welding or the like. The auxiliary barrier 500 is not separated from the lower auxiliary panel 200 in the z-axis direction so that the block 300 and the lower auxiliary panel 200, the block 300, The auxiliary barrier 500 and the block 300 are movable by a distance in the z-axis vertical direction.

Subsequently, the upper sub-panel 600 is positioned on the auxiliary barrier 500 and the hole corresponding to the block 300 formed on the upper sub-panel 600 is aligned with the position of the block 300. The stud bolt 810 is then coupled to the threaded bore 310 of the hole formed in the central portion 320 of the block 300. At this time, the assembling order of the stud bolts 810 may be before the installation of the auxiliary barrier 500, and the work order is not affected.

The spacer 900 and the washer 820 are then inserted around the stud bolt 810. Finally, the nut 830 is fastened to complete the coupling of the coupling member 800. The spacer 900 keeps the distance between the nut 830 and the block 300 even if the nut 830 is tightened tightly so that the block 300 slides along the thermal deformation of the auxiliary barrier 500 It can be easy.

Finally, the upper insulating panel 700 is laminated to complete the upper insulating panel structure 22, and the kitchen wall 10 is laminated. The upper insulating panel may be joined to the coupling unit in an adhesive bonding state with the upper sub-panel, or may be adhesively bonded after coupling of the upper sub-panel.

The coupling block 800 of the coupling member 800 and the upper insulating panel structure 22 are coupled in the z-axis direction so that the lower insulating panel structure 21, the auxiliary barrier 500, and the upper insulating panel structure 22 are completed by the coupling unit 23 in the z-axis direction.

4 is a perspective view showing a state in which the coupling unit 23 according to the embodiment of the present invention is moved by thermal deformation of the auxiliary barrier 500.

The fixed piece 400 or the block 300 has a space between the first depressed portion 210 and the second depressed portion 220 in a direction perpendicular to the z axis, The central portion 320 may be lower than the bottom surface of the second sub-panel 220 and the lower portion 330 may be lower than the bottom surface of the second sub-panel 220, and the center portion 320 may be lower than the + z- Although the auxiliary barrier 500 is omitted in FIG. 4, since the auxiliary barrier 500 is heat-shrunk in the xy plane direction, the block 300 coupled with the auxiliary barrier 500 by welding or the like moves along the auxiliary barrier 500 Respectively.

Although the first depression 210 is formed in the lower sub-panel 200 located on the + z-direction of the lower insulation panel 100 in the embodiment of the present invention, the lower sub- And a first depression (210) is formed in the heat insulating panel (100).

In the embodiment of the present invention, the first depressed portion 210 and the second depressed portion 220 are formed on the lower insulation panel 100 or the lower sub-panel 200, A first depression 210 (not shown) and a second depression 220 (not shown) are formed in the upper insulation panel 700 or the upper subpanel 600, And thus the relation between the block 300 and the coupling member 800 is included.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, You will understand. Accordingly, the true scope of the invention should be determined only by the appended claims.

10: Kitchen wall, 20: Insulation panel assembly,
21: lower insulation panel structure, 22: upper insulation panel structure,
23: coupling unit, 30: outer wall,
31: mastic, 100: bottom insulating panel,
200: lower sub-panel, 210: first depression,
220: second depression, 300: block,
310: Screw bone, 320: Center,
330: peripheral portion, 400: fixed portion,
410: rivet, 500: secondary barrier,
600: upper auxiliary panel, 700: upper insulating panel,
800: coupling member, 810: stud bolt,
820: Washer, 830: Nut,
900: Spacer,

Claims (8)

A main wall enclosing an accommodating space in which liquefied gas is contained, an upper insulating panel structure surrounding the kitchen wall, a lower adiabatic panel structure surrounding the upper adiabatic panel structure, and an outer wall surrounding the lower adiabatic panel structure In a cargo hold of a liquefied gas carrier,
An auxiliary barrier positioned between the upper and lower thermal insulation panel structures; And
And an engaging unit for engaging the upper heat insulating panel structure, the auxiliary wall, and the lower heat insulating panel structure,
The coupling unit
A block inserted into a depression formed on an upper surface of the lower adiabatic panel structure; And
And a fixing piece for restricting movement of the block in a direction in which the kitchen wall, the upper heat insulating panel structure, and the lower heat insulating panel structure are stacked (hereinafter referred to as "stacking direction"),
The block
The recess and the fixing piece being spaced apart from each other in a direction perpendicular to the stacking direction,
And which is movable in the vertical direction in the stacking direction in accordance with thermal shrinkage or thermal expansion of the auxiliary barrier in association with the auxiliary barrier. The method according to claim 1,
The coupling unit includes:
An engaging member connected to the block and penetrating a portion of the lower portion of the upper adiabatic panel structure to engage the block and the upper adiabatic panel structure in a stacking direction by tightening a nut; And
And a spacer positioned between the nut and the block to maintain a constant distance between the nut and the block. delete 3. The method of claim 2,
Wherein the lower insulation panel structure includes a lower sub-panel between the lower insulation panel and the auxiliary barrier,
The upper insulating panel structure further comprising an upper sub-panel between the upper insulating panel and the auxiliary barrier,
Wherein the depression is formed in the lower sub-panel. 3. The method of claim 2,
The combination of the auxiliary barrier and the block is a welded joint of a liquefied gas transportation vessel. 3. The method of claim 2,
The block has a hole, a threaded portion is formed on an outer surface of the hole,
Wherein the coupling member comprises threads threaded through the upper adiabatic panel structure and fastened to threaded bosses of the block. 7. The method according to any one of claims 2 to 6,
Wherein the fixing piece has a catching jaw which is engaged with the lower adiabatic panel structure and covers a part of the block to prevent the block from being released in the lamination direction. 8. The method of claim 7,
The block is formed in a circular or donut shape,
Wherein the fastening piece has a ring shape including the block therein.

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