JP7359488B2 - Containment system and its construction method - Google Patents

Description

The present invention relates to a containment system, and more particularly to a containment system for storing and transporting liquefied gas and a method for constructing the same.

Cryogenic liquefied gases such as liquefied natural gas (LNG) and liquefied petroleum gas (LPG) are stored and transported in various containment systems such as tanks, ships, and pipes. Ru. The containment system can be installed on a ship, barge, floating platform, or on land.

Storage systems are broadly classified into independent types and membrane types. The stand-alone type consists of a sturdy tank made of aluminum, stainless steel, or steel alloy, and an insulating material attached to the tank's outer wall. The insulation may consist of insulating panels or a spray applied insulation layer.

The insulation panel can be made of polyurethane foam, expanded polystyrene, etc., and is fixed to the tank outer wall with fasteners such as stud bolts. The heat insulating layer may include polyurethane, and may be manufactured by spraying a mixture of polyol and isocyanate onto the outer wall of the tank using a spray gun.

The heat insulating layer does not require any fixing devices on the outer wall of the tank, and has excellent adhesion to the outer wall of the tank. On the other hand, if thick insulation is required, the smaller the tank or the shape with corners, such as a prismatic shape, the greater the risk of cracking and peeling of the insulation layer. This is due to the temperature gradient of about 200° C. across the heat insulating layer due to the temperature difference between the tank and the outside air when the liquefied gas is stored in the tank, and the difference in thermal expansion coefficient between the tank and the heat insulating layer.

One aspect of the present invention provides a containment system including a spray-type heat insulating layer that can suppress the occurrence of cracks and peeling of the heat insulating layer, and a method for constructing the same.

A containment system according to an embodiment of the present invention includes a tank having an internal space for storing liquefied gas, a buffer layer non-adhesively fixed to at least a portion of an outer wall of the tank, and a spray coating that covers the outer surface of the buffer layer. Contains a foam insulation layer formed by a method. The buffer layer is thinner and more flexible than the foam insulation layer, and is formed of a material having an elastic modulus smaller than that of the foam insulation layer.

The buffer layer may include a thermal insulation layer. The heat insulating layer may include at least one selected from the group consisting of soft expanded urethane foam, soft expanded polystyrene foam, melamine foam, and polyethylene foam.

The inner and outer surfaces of the heat insulating layer may be covered with a thin metal plate, and the heat insulating layer and the thin metal plate may constitute a heat insulating part. The buffer layer may include a first crack barrier covering an outer surface of the insulation. The first crack barrier may include one of glass cloth and glass mesh.

The buffer layer may be fabricated in sheet form and may be physically fixed to at least a portion of the outer wall of the tank by means of fasteners. The fixing device includes a stud bolt fixed to the outer wall of the tank and passing through the buffer layer, a fixing washer fastened to the stud bolt over the buffer layer, and a fixing nut fastened to the stud bolt over the fixing washer. obtain.

On the other hand, the fixture may include a sudad pin fixed to the outer wall of the tank and passing through the buffer layer, and a fixing washer fastened to the sudad pin above the buffer layer. The stud pin may include a vertical portion that passes through the buffer layer and the fixed washer, and a horizontal portion that is bent from the vertical portion and tightly contacts the upper surface of the fixed washer.

The containment system may further include a flexible protective layer covering an exterior surface of the foam insulation layer. The foam insulation layer and the flexible protective layer can form a seamless unitary structure. A second crack barrier may be located within the foam insulation layer. The second crack barrier may include at least one of glass cloth, glass mesh, and metal matrix.

A method for constructing a containment system according to an embodiment of the present invention includes the steps of: providing a tank for storing liquefied gas; fixing a buffer layer to at least a portion of an outer wall of the tank using a fixture; forming a foam heat insulating layer on the outer surface of the heat insulating layer by spraying. The buffer layer is thinner and more flexible than the foam insulation layer, and is formed of a material having an elastic modulus smaller than that of the foam insulation layer.

The buffer layer may be fabricated in the form of a roll of a long sheet wound into a circle and transferred to the outer wall of the tank, and the sheets may be unrolled from the roll and placed one after another on the outer wall of the tank. The buffer layer disposed on the outer wall of the tank may include an overlapping region of double sheets.

The buffer layer may be physically fixed to at least a portion of the tank by a fixture, and a central portion of the physically fixed buffer layer that does not overlap the fixture may remain non-adhered to the outer wall of the tank.

The fasteners may include stud bolts secured to the outer wall of the tank. When the buffer layer is disposed on the outer wall of the tank, a stud bolt may pass through the buffer layer, and a fixing washer and a fixing nut may be sequentially fastened to the stud bolt.

On the other hand, the fixture may include a stud pin fixed to the outer wall of the tank. When the buffer layer is disposed on the outer wall of the tank, the sudad pin may pass through the buffer layer, a fixing washer may be fastened to the sudud pin, and the sudud pin may be bent so that a part of the sudud pin is brought into close contact with the upper surface of the fixing washer.

The buffer layer may include an insulating section facing the tank and a first crack barrier covering an outer surface of the insulating section. The heat insulating section may include a heat insulating layer including at least one selected from the group consisting of soft urethane foam, soft polystyrene foam, melamine foam, and polyethylene foam, and a thin metal plate covering the inner and outer surfaces of the heat insulating layer. The first crack barrier may include one of glass cloth and glass mesh. In the step of forming the foam insulation layer, a first foam insulation layer is formed on the buffer layer by a spray method, and a second crack barrier including one of glass cloth and glass mesh is formed on the first foam insulation layer. and forming a second foam insulation layer on the second crack barrier using a spray method.

After forming the foam insulation layer, the method for constructing the containment system may further include forming a flexible protective layer on the foam insulation layer by spraying.

The storage system according to an embodiment of the present invention can be constructed quickly and easily, and has low construction cost, so it is highly economical. In addition, it can be applied to tanks of various shapes by minimizing mechanical fixing, effectively suppressing cracks and peeling of the foam insulation layer, and can withstand extreme temperature changes, providing operational freedom. is high.

1 is a partially enlarged cross-sectional view of a storage system according to a first embodiment of the present invention; FIG. 2 is an enlarged cross-sectional view of a buffer layer of the storage system shown in FIG. 1; FIG. FIG. 3 is a partially enlarged sectional view of the storage system corresponding to the bending section. FIG. 3 is a partially enlarged cross-sectional view of a storage system according to a second embodiment of the present invention. FIG. 3 is a partially enlarged cross-sectional view of a storage system according to a second embodiment of the present invention. FIG. 7 is a partially enlarged cross-sectional view of a buffer layer and fixture of a containment system according to a third embodiment of the present invention; 1 is a flowchart illustrating a method for constructing a storage system according to an embodiment of the present invention. 8 is a schematic diagram of a tank shown for explaining the first stage and second stage shown in FIG. 7. FIG. 8 is a schematic diagram of a tank shown for explaining the first stage and second stage shown in FIG. 7. FIG. FIG. 8 is an enlarged cross-sectional view of the buffer layer and fixture for explaining the second stage shown in FIG. 7; FIG. 8 is an enlarged cross-sectional view of the buffer layer and fixture for explaining the second stage shown in FIG. 7; 8 is a schematic diagram showing the storage system after the fourth stage shown in FIG. 7; FIG.

Form for carrying out the invention

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those with ordinary knowledge in the technical field to which the present invention pertains can easily implement them. The invention may take many different forms and is not limited to the embodiments described herein.

In order to clearly explain the present invention in the drawings, parts that are not relevant to the description are omitted, and the same or similar components are given the same reference numerals throughout the specification.

Further, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of explanation, so the present invention is not necessarily limited to what is shown.

Throughout the specification, when we say that a certain part is "connected" to another part, we are referring not only to cases where it is "directly connected" but also "indirectly connected" by placing other parts in between. ” including cases where Further, when a part is said to "include" a certain component, unless there is a statement to the contrary, this means that the part does not exclude other components, but may further include other components.

FIG. 1 is a partially enlarged sectional view of a storage system according to a first embodiment of the present invention, and FIG. 2 is an enlarged sectional view of a buffer layer of the storage system shown in FIG.

Referring to FIGS. 1 and 2, the storage system 100 of the first embodiment includes a tank 10 for storing liquefied gas, a buffer layer 20 fixed to the outer wall of the tank 10 in a non-adhesive state, and an outer surface of the buffer layer 20. It includes a covering foam insulation layer 30.

The tank 10 has various shapes such as a spherical type, a cylindrical type, and a prismatic type, and can be made of metal such as aluminum, stainless steel, and steel alloy. The liquefied gas is stored in a sealed internal space of the tank 10.

The buffer layer 20 includes a heat insulating part 21 facing the tank 10 and a crack barrier 22 covering the outer surface of the heat insulating part 21 . The heat insulating part 21 may include a heat insulating layer 211 and a thin metal plate 212 covering both sides of the heat insulating layer 211 .

The heat insulating layer 211 may include at least one of soft urethane foam, soft polystyrene foam, melamine foam, and polyethylene foam, and the thin metal plate 212 may be an aluminum foil plate, and more preferably, fiberglass is bonded to the aluminum foil plate. It may be a thin plate (ALGC, Aluminum & Glass-Cloth). The crack barrier 22 may include at least one of glass cloth and glass mesh.

The buffer layer 20 is prefabricated in the form of a sheet, and is physically fixed to the outer wall of the tank 10 by a fixture 40 without any adhesive means such as adhesive. The fixture 40 may include a combination of a stud bolt 41, at least one fixing washer 42, and a fixing nut 43.

For example, the stud bolt 41 is fixed to the outer wall of the tank 10 by a method such as welding, and penetrates the buffer layer 20. The first fixing washer 421 is fastened to the stud bolt 41 on the buffer layer 20, and the second fixing washer 422 and the fixing nut 43 are sequentially fastened to the stud bolt 41 on the first fixing washer 421. The fastening force of the fixing nut 43 causes the first fixing washer 421 to strongly press the buffer layer 20 to firmly fix the buffer layer 20 to the tank 10 .

The first fixing washer 421 may be made of any one of urethane rubber, plywood, and plastic, and may have a relatively large diameter to ensure a sufficient contact area with the buffer layer 20. The second fixing washer 422 may be made of metal and has a smaller size than the first fixing washer 421. The second fixing washer 422 can be selectively used for strength reinforcement when there is a risk of damage such as breakage of the first fixing washer 421.

A plurality of fixtures 40 are provided on the outer wall of the tank 10 at a distance from each other. For convenience, one fixture 40 is shown in FIG. The buffer layer 20 is fixed in position by the physical force applied by the fixture 40, and is firmly fixed to at least a portion of the outer wall of the tank 10 in a non-adhesive state. In this case, "non-adhesive" means that chemical adhesion means are excluded.

On the other hand, according to the embodiment of the present invention, the buffer layer 20 is fixed to the entire outer wall of the tank 10 in a non-adhesive state, but is fixed to only a part of the outer wall of the tank 10 in a non-adhesive state, and the remaining part It can also be fixed with adhesive. That is, the embodiment of the present invention applies not only to the case where the buffer layer 20 is fixed to the entire outer wall of the tank 10 in a non-adhesive state, but also to the case where the buffer layer 20 is fixed to a part of the outer wall of the tank 10 in a non-adhesive state. Also included.

The foamed heat insulating layer 30 is formed by a spray method and is fixed to the outer surface of the buffer layer 20 without a separate adhesive means. The foamed heat insulating layer 30 may include polyurethane, and may be manufactured by spraying a mixture of polyol and isocyanate onto the outer surfaces of the fixture 40 and the buffer layer 20 using a spray gun.

The polyol and isocyanate are mixed by being placed in their own containers and pumped through a hose with a spray gun, and the mixture is sprayed onto the outer surface of the buffer layer 20. The injected mixture sticks to the outer surface of the buffer layer 20 and begins to expand. During the expansion process, the mixture is transformed into a hard porous structure to generate cellular foam with enhanced heat retention, and the buffer layer 20 permanently affixed to the exterior surface of the

As described above, since the crack barrier 22 includes either glass cloth or glass mesh, it has a woven or mesh structure in which fine pores are formed. Therefore, the foamed heat insulating layer 30 can penetrate through the micropores or gaps of the crack barrier 22 and come into contact with the thin metal plate 212 of the heat insulating part 21, and can be very firmly attached to the buffer layer 20.

The foam insulation layer 30 is covered with a flexible protective layer 50. The flexible protective layer 50 may include a semi-flexible coat layer, a semi-flexible mastic, a reinforcing coat layer reinforced therewith, or a metal jacketing.

The flexible protective layer 50 can be formed by spraying a coating composition on the outer surface of the foamed heat insulating layer 30 and then curing it, or by applying a mastic composition and then curing it, using appropriate tools and equipment. The coating composition can be a polyurethane-based composition. Alternatively, as another form of the flexible protective layer 50, a metal material may be placed (jacketed) on the outer surface of the foamed heat insulating layer 30 to form the flexible protective layer 50.

In the containment system 100, the buffer layer 20, the foam insulation layer 30, and the flexible protective layer 50, excluding the tank 10, constitute a cryogenic insulation structure 60. The foamed insulation layer 30 occupies most of the cryogenic insulation structure 60 in terms of volume. That is, the buffer layer 20 and the flexible protective layer 50 have a very small thickness when compared to the foamed heat insulating layer 30.

The foam insulation layer 30 and the flexible protective layer 50 each consist of a seamless unitary structure. The seamless structure of the foam insulation layer 30 and the flexible protective layer 50 smooths the surface of the containment system 100 and improves the tightness of the containment system 100. The flexible protective layer 50 also increases the rigidity of the containment system 100 surface.

In the containment system 100 described above, the buffer layer 20 located between the tank 10 and the foam insulation layer 30 is thinner and more flexible than the foam insulation layer 30, and has a smaller elastic modulus than the foam insulation layer 30. It is made of material that has. In addition, since the buffer layer 20 is fixed to the outer wall of the tank 10 by the fixing device 40 in a non-adhesive state, the central part of the buffer layer 20 that does not overlap with the plurality of fixing devices 40 (for convenience, referred to as "non-fixed part") is in the tank 10. No restraining force is applied to the outer wall of No.10.

In other words, since the non-fixed portion of the buffer layer 20 simply covers the outer wall of the tank 10 without adhesive, a predetermined gap exists between the outer wall of the tank 10 and the non-fixed portion, and the tank 10 No mutual restraining force acts between the outer wall of the holder and the unfixed part.

Cryogenic insulation structure 60 is located throughout the outer wall of tank 10 . At this time, the outer wall of the tank 10 may include a flat part and a bent part. FIG. 3 is a partially enlarged sectional view of the storage system 100 corresponding to the bending section. The storage system 100 of FIG. 1 shows a flat section. Referring to FIGS. 1 and 3, a plurality of fixtures 40 are provided at a distance from each other in all of the flat parts and bent parts, and cryogenic insulation structures 60 having the same configuration are located in all of the flat parts and bent parts.

Before the liquefied gas is stored in the tank 10, the inner and outer surfaces of the foam insulation layer 30 maintain the same temperature. For example, when the outside air temperature is 20°C, both the inner and outer surfaces of the foamed heat insulating layer 30 can maintain a temperature of 20°C. There are no temperature gradients in the foam insulation layer 30.

When liquefied gas, for example liquefied natural gas (LNG), flows into the tank 10, the inner surfaces of the buffer layer 20 in contact with the outer wall of the tank 10 and the foam insulation layer 30 in contact with the buffer layer 20 are cooled to approximately -163°C; The outer surface of layer 30 still maintains a temperature of 20°C. A temperature gradient up to approximately 183° C. exists in the foam insulation layer 30, and stress is generated in the buffer layer 20 and the foam insulation layer 30 due to the difference in coefficient of thermal expansion between the tank 10 and the foam insulation layer 30.

At this time, the stress is concentrated on the buffer layer 20 that is in contact with the inner surface of the foam insulation layer 30, but the buffer layer 20 is thinner and more flexible than the foam insulation layer 30, and is easily deformed due to its material properties having a low elastic modulus. The deformation of the buffer layer 20 acts to absorb the deformation rate of the foamed heat insulating layer 30 and reduce the stress in the foamed heat insulating layer 30.

Furthermore, when the temperature of the outside air rises to 45°C, the temperature gradient across the foamed heat insulating layer 30 rises to approximately 208°C. In this case, as the stress of the foamed heat insulating layer 30 increases, the deformation rate also increases, but the buffer layer 20 is deformed more than the case described above (when the outside air is 20° C.), and the deformation rate of the foamed heat insulating layer 30 increases. The stress of the foamed heat insulating layer 30 is reduced by absorbing it.

In both of the two cases described above, the buffer layer 20 is non-adhesively fixed to the outer wall of the tank 10, so that the foamed heat insulating layer 30 is not linked in movement with the tank 10. That is, when the tank 10 and the foam insulation layer 30 are cooled by liquefied gas, a difference in shrinkage rate occurs between the tank 10 and the foam insulation layer 30 due to the difference in coefficient of thermal expansion, but between the buffer layer 20 and the outer wall of the tank 10 The gap existing in the tank 10 blocks direct interaction between the tank 10 and the foam insulation layer 30.

For example, assuming that the buffer layer 20 is omitted and the foamed heat insulating layer 30 is directly formed on the outer wall of the tank 10 by a spray method, the foamed heat insulating layer 30 and the tank 10 are linked in movement.
Specifically, when the tank 10 and the foam insulation layer 30 are cooled, the contraction rate of the foam insulation layer 30 is different from that of the tank 10, but the inner surface of the foam insulation layer 30 should follow the contraction rate of the tank 10. . As a result, the stress in the foamed heat insulating layer 30 increases as the temperature gradient increases, and the risk of cracking and peeling in the foamed heat insulating layer 30 increases.

However, in the storage system 100 of this embodiment, the movement of the tank 10 and the foam insulation layer 30 are not directly linked due to the fixed structure of the buffer layer 20, so cracks and peeling of the foam insulation layer 30 due to contraction and expansion of the tank 10 are effectively prevented. can be suppressed to

4 and 5 are partially enlarged sectional views of a storage system according to a second embodiment of the present invention. 4 corresponds to a flat portion of the tank outer wall, and FIG. 5 corresponds to a bent portion of the tank outer wall.

Referring to FIGS. 4 and 5, in the second embodiment of the containment system 200, a second crack barrier 33 is located inside the foam insulation layer 30. For convenience, the crack barrier 22 included in the buffer layer 20 will be referred to as a "first crack barrier." The foam insulation layer 30 includes a first foam insulation layer 31 located between the first crack barrier 22 and the second crack barrier 33, and a second foam insulation layer 31 located between the second crack barrier 33 and the flexible protective layer 50. It can be comprised of layers 32.

The first foam insulation layer 31 may be formed on the first crack barrier 22 by a spray method, and the second crack barrier 33 may be positioned on the first foam insulation layer 31 . The second foam insulation layer 32 is formed on the second crack barrier 33 by a spray method.

The second crack barrier 33 is thinner and more flexible than the foam insulation layer 30 and is formed of a material having an elastic modulus smaller than that of the foam insulation layer 30 . For example, the second crack barrier 33 may include at least one of glass cloth, glass mesh, and metal matrix, and may be formed of the same material as the first crack barrier 22 . Therefore, when the liquefied gas is stored in the tank 10 and stress is generated in the foam insulation layer 30, the second crack barrier 33 is easily deformed due to its material properties, absorbs the deformation rate of the foam insulation layer 30, and the foam insulation layer Reduce stress of 30. The second crack barrier 33 may be composed of one or more pieces.

The storage system 200 of the second embodiment, which includes the second crack barrier 33 together with the buffer layer 20, can more effectively suppress the occurrence of cracks and peeling of the foamed heat insulating layer 30. Therefore, when the temperature gradient across the foamed heat insulating layer 30 is very large, stress in the foamed heat insulating layer 30 can be reduced more effectively. The storage system 200 of the second embodiment has the same or similar configuration as the first embodiment described above except for the addition of the second crack barrier 33, and therefore, redundant explanation will be omitted.

FIG. 6 is a partially enlarged cross-sectional view of a buffer layer and fixture of a containment system according to a third embodiment of the present invention.

Referring to FIG. 6, in the storage system of the third embodiment, the fixture 401 may include a stud pin 45 and a fixing washer 46. The stud pin 45 may include a vertical portion 451 that passes through the buffer layer 20 and the fixed washer 46, and a horizontal portion 452 that is bent from the vertical portion 451 and closely contacts the upper surface of the fixed washer 46. The horizontal portion 452 is bent at a right angle from the vertical portion 451, and the end of the horizontal portion 452 may have a pointed shape.

The stud pin 45 may have a rod shape and penetrate the buffer layer 20 in this state. The fixing washer 46 is fastened to the stud pin 45 on the buffer layer 20. The fixed washer 46 is made of the same material and shape as the first fixed washer 421 of the first embodiment. After the buffer layer 20 and the fixing washer 46 are combined with the stud pin 45, the upper part of the stud pin 45 is bent at a right angle to form a horizontal part 452, and the horizontal part 452 strongly presses the fixing washer 46 and the buffer layer 20, and the buffer layer 20 is firmly fixed to the tank 10.

In this way, the horizontal portion 452 of the stud pin 45 functions as the fixing nut 43 of the first embodiment. The aforementioned fixture 401 can omit the fixing nut, reduce the number of parts, and simplify the overall configuration. The storage system of the third embodiment has the same or similar configuration as any one of the first and second embodiments described above, except for the configuration of the fixture 401.

FIG. 7 is a flowchart illustrating a method for constructing a storage system according to an embodiment of the present invention.

Referring to FIG. 7, a method for constructing a containment system according to an embodiment includes a first step (S10) of providing a tank for liquefied gas storage, and fixing a buffer layer to the outer wall of the tank using a plurality of fixtures. The method includes a second step (S20) and a third step (S30) of forming a foamed heat insulating layer on the outer surface of the buffer layer by spraying. After the third step (S30), a fourth step (S40) is performed in which a flexible protective layer is formed on the foam insulation layer.

8 and 9 are schematic diagrams of tanks shown to explain the first stage and second stage shown in FIG. 7.

Referring to FIGS. 8 and 9, in the first step (S10), the tank 10 may have a spherical, prismatic, or cylindrical shape, and may be made of aluminum, stainless steel, steel alloy, etc. can. The tank 10 includes a pipe structure 11 for inflowing and discharging liquefied gas. The pipe structure 11 may be a structure that protrudes outside the tank 10.

8 shows an example in which the tank 10 has a prismatic shape, and FIG. 9 shows an example in which the tank 10 has a cylindrical shape and is provided on two supports 12. The shape and support structure of the tank 10 are not limited to the illustrated example.

In the second step (S20), a plurality of stud bolts 41 are provided on the outer wall of the tank 10 at a distance from each other. On the other hand, instead of the stud bolts 41, a plurality of stud pins 45 may be provided at a distance from each other on the outer wall of the tank 10. The stud bolt 41 and the stud pin 45 can be made of metal like the tank 10, and are attached to the outer wall of the tank 10 by welding or the like.

10 and 11 are enlarged cross-sectional views of the buffer layer and fixture for explaining the second stage shown in FIG. 7. FIG. 10 shows a fixture 40 of the first embodiment, and FIG. 11 shows a fixture 401 of the third embodiment.

Referring to FIGS. 8 to 11, a buffer layer 20 is disposed on the entire outer wall of the tank 10 except for the pipe structure 11, and during this process, a stud bolt 41 or stud pin 45 penetrates the buffer layer 20. That is, through holes corresponding to stud bolts 41 or stud pins 45 are formed in the buffer layer 20, and the buffer layer 20 is temporarily fixed in position by the stud bolts 41 or stud pins 45.

The buffer layer 20 may be in the form of a long sheet having a certain width, and may be rolled into a roll before being applied to the outer wall of the tank 10 . The buffer layer 20 manufactured in the form of a roll may be transported from a factory to a site, and then the sheet may be spread out from the roll and sequentially placed on the outer wall of the tank 10.

At this time, the buffer layer 20 unrolled from the roll partially overlaps the adjacent buffer layer 20 arranged previously. Therefore, on the outer wall of the tank 10, the buffer layer 20 may have an overlap region 21 (see FIG. 9) in which double sheets overlap. The roll-shaped buffer layer 20 is easy to transport and store, and can be conveniently placed in a short time regardless of the shape of the tank 10.

Meanwhile, as another form of the buffer layer 20, the buffer layer 20 may be manufactured in a sheet shape of a certain standard instead of a long sheet shape. For example, before the buffer layer 20 is applied to the outer wall of the tank 10, it may be formed into a rectangular sheet having certain horizontal and vertical dimensions. In such a case, the buffer layers 20 in the form of rectangular sheets can be arranged side by side and adjacent to each other, or the buffer layers 20 can be arranged on the outer wall of the tank 10 with their edges overlapping each other.

In the case of the stud bolt 41, first and second fixing washers 421 and 422 and a fixing nut 43 are sequentially fastened to the stud bolt 41 on the buffer layer 20 to firmly fix the buffer layer 20. In the case of the stud pin 45, a fixing washer 46 is fastened to the stud pin 45 on top of the buffer layer 20, and the stud pin 45 bends at right angles on the fixing washer 46 to push the fixing washer 46 and firmly fix the buffer layer 20.

The buffer layer 20 includes a heat insulating part 21 facing the tank 10 and a crack barrier 22 covering the outer surface of the heat insulating part 21, and is fixed in position to the outer wall of the tank 10 by a plurality of fixtures 40, 401. A predetermined gap exists between the buffer layer 20 and the outer wall of the tank 10 at a central portion of the buffer layer 20 that does not overlap with the fixtures 40 and 401 (non-fixed portion).

On the other hand, according to the embodiment of the present invention, the buffer layer 20 is fixed to the entire outer wall of the tank 10 by the fixtures 40 and 401 in a non-adhesive state, but is fixed only to a part of the outer wall of the tank 10 in a non-adhesive state. The remaining part can also be fixed with adhesive. That is, the embodiments of the present invention provide not only a method for fixing the buffer layer 20 to the entire outer wall of the tank 10 using the fixtures 40 and 401 in a non-adhesive state, but also a method for fixing the buffer layer 20 to a part of the outer wall of the tank 10 in a non-adhesive state. It also includes how to fix it.

Referring to FIGS. 1 and 7, in a third step (S30), a foamed heat insulating layer 30 is formed on the outer surface of the buffer layer 20 by spraying. The foamed heat insulating layer 30 may include polyurethane, and may be formed by spraying a mixture of polyol and isocyanate on the outer surface of the buffer layer 20 using a spray gun. The injected mixture sticks to the outer surface of the buffer layer 20 and expands, and during the expansion process, it changes into a porous structure and hardens to form the foamed heat insulating layer 30.

On the other hand, referring to FIGS. 4 and 7, in the third step (S30), the foam insulation layer 30 can be formed separately into a first foam insulation layer 31 and a second foam insulation layer 32, and the first foam insulation layer 31 and the second foam insulation layer 32 can be formed separately. A second crack barrier 33 may be located between the second foam insulation layer 32 .

Specifically, the first foam insulation layer 31 is formed on the outer surface of the buffer layer 20 by a spray method, and the second crack barrier 33 made of either glass cloth or glass mesh is formed on the first foam insulation layer 31. can be placed on top of. Next, the second foam insulation layer 32 may be formed on the second crack barrier 33 by a spray method.

The second crack barrier 33 can be manufactured in the form of a roll, which is a long sheet wound into a circle, similar to the buffer layer 20 described above, and the sheet can be spread out and placed on the first foamed heat insulating layer 31 . The second crack barrier 33 is easily deformed when stress is generated in the foam insulation layer 30, absorbs the deformation rate of the foam insulation layer 30, and reduces stress in the foam insulation layer 30.

Referring to FIGS. 1, 4, and 7, in a fourth step (S40), a flexible protective layer 50 is formed on the foam insulation layer 30. The flexible protective layer 50 may be formed by spraying a polyurethane-based coating composition and then curing it, or by applying and curing a mastic composition.

FIG. 12 is a schematic diagram showing the fourth stage post-storage system shown in FIG. 7.

Referring to FIG. 12, the cryogenic insulation structure 60 of the containment system 100 can be constructed quickly and easily regardless of the shape of the tank 10, and can withstand extreme temperature changes, providing a high degree of operational freedom. Furthermore, since the foamed heat insulating layer 30 and the flexible protective layer 50 have a seamless single structure, the surface of the containment system 100 is smoothed and the airtightness and firmness of the surface of the containment system 100 are improved.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and can be implemented with various modifications within the scope of the claims, detailed description of the invention, and accompanying drawings. Naturally, this also falls within the scope of the present invention.

100,200 Containment system 10 Tank 20 Buffer layer 21 Heat insulation part 22 Crack barrier (first crack barrier)
30 Foamed insulation layer 31 First foamed insulation layer 32 Second foamed insulation layer 33 Second crack barrier 40, 401 Fixing device 41 Stud bolts 42, 46 Fixing washer 43 Fixing nut 45 Stud pin 50 Flexible protective layer 60 Cryogenic insulation structure

Claims (14)

a tank with an internal space for liquefied gas storage;
a buffer layer manufactured in the form of a sheet and physically fixed in a non-adhesive manner to at least a portion of the outer wall of the tank by means of a fixture; and
a foamed heat insulating layer that covers the outer surfaces of the fixture and the buffer layer and is formed by a spray method;
including;
The buffer layer is thinner and more flexible than the foam insulation layer, and is formed of a material having an elastic modulus smaller than the elastic modulus of the foam insulation layer ;
The fixture is
a stud bolt fixed to the outer wall of the tank and penetrating the buffer layer;
a fixing washer fastened to the stud bolt above the buffer layer and pressurizing the buffer layer toward the tank while in contact with the outer surface of the buffer layer;
a fixing nut fastened to the stud bolt over the fixing washer ;
storage system. The buffer layer includes a heat insulating layer,
2. The containment system of claim 1, wherein the thermal insulation layer includes at least one selected from the group consisting of soft expanded urethane foam, soft expanded polystyrene foam, melamine foam, and polyethylene foam. The inner and outer surfaces of the heat insulation layer are covered with a thin metal plate,
3. The containment system of claim 2, wherein the heat insulating layer and the metal sheet constitute a heat insulator. The buffer layer includes a first crack barrier covering an outer surface of the heat insulation part,
The storage system of claim 3, wherein the first crack barrier includes one of a glass cloth and a glass mesh. a tank with an internal space for liquefied gas storage;
a buffer layer manufactured in the form of a sheet and physically fixed in a non-adhesive manner to at least a portion of the outer wall of the tank by means of a fixture; and
a foamed heat insulating layer that covers the outer surface of the buffer layer and is formed by a spray method;
including;
The buffer layer is thinner and more flexible than the foam insulation layer, and is formed of a material having an elastic modulus smaller than the elastic modulus of the foam insulation layer;
The fixture is
a sudad pin fixed to an outer wall of the tank and penetrating the buffer layer; and a fixing washer fastened to the sudad pin on the buffer layer,
The stud pin includes a vertical part that passes through the buffer layer and the fixing washer, and a horizontal part that is bent from the vertical part and tightly contacts the upper surface of the fixing washer. further comprising a flexible protective layer covering the outer surface of the foam insulation layer,
6. A containment system according to any preceding claim, wherein the foam insulation layer and the flexible protective layer form a seamless unitary structure. a second crack barrier is located inside the foam insulation layer;
6. The containment system according to claim 1 , wherein the second crack barrier includes at least one of glass cloth, glass mesh, and metal matrix. providing a tank for liquefied gas storage;
fixing the buffer layer to at least a portion of the outer wall of the tank using a fixing device;
forming a foam insulation layer on the outer surface of the buffer layer by spraying;
including;
The buffer layer is thinner and more flexible than the foam insulation layer, and is formed of a material having an elastic modulus smaller than the elastic modulus of the foam insulation layer, and
The buffer layer is manufactured in the form of a roll in which a long sheet is wound into a circle and transferred to the outer wall of the tank, and the sheet is spread from the roll and sequentially arranged on the outer wall of the tank.
The buffer layer disposed on the outer wall of the tank includes an overlapping area of two overlapping sheets. the buffer layer is physically fixed to at least a portion of the tank by the fixture;
9. The method of constructing a containment system according to claim 8 , wherein a central portion of the physically fixed buffer layer that does not overlap with the fixing device is maintained in a non-adhesive state with the outer wall of the tank. The fixing device includes a stud bolt fixed to an outer wall of the tank,
when the buffer layer is placed on the outer wall of the tank, the stud bolt penetrates the buffer layer;
The method for constructing a storage system according to claim 9 , wherein a fixing washer and a fixing nut are sequentially fastened to the stud bolt. The fixing device includes a stud pin fixed to an outer wall of the tank, and
when the buffer layer is disposed on the outer wall of the tank, the stud pin penetrates the buffer layer;
A fixing washer is fastened to the stud pin,
10. The method of constructing a storage system according to claim 9 , wherein the stud pin is bent so that a portion of the stud pin is brought into close contact with the upper surface of the fixing washer. The buffer layer includes a heat insulating part facing the tank and a first crack barrier covering an outer surface of the heat insulating part,
The heat insulating part includes a heat insulating layer including at least one selected from the group consisting of soft urethane foam, soft polystyrene foam, melamine foam, and polyethylene foam, and a thin metal plate covering the inner and outer surfaces of the heat insulating layer,
9. The method of constructing a containment system according to claim 8 , wherein the first crack barrier includes one of glass cloth and glass mesh. Forming the foam insulation layer includes:
A first foam insulation layer is formed on the buffer layer by spraying, and a second crack including at least one of glass cloth, glass mesh, and metal matrix is formed on the first foam insulation layer. 9. The method of constructing a containment system according to claim 8 , comprising the steps of disposing a barrier and forming a second foam insulation layer on the second crack barrier by spraying. The containment system according to any one of claims 8 to 13 , further comprising, after forming the foam insulation layer, forming a flexible protective layer on the foam insulation layer by spraying. Construction method.

Images