KR102365770B1 - Containment system and manufacturing method thereof - Google Patents

Abstract

A containment system according to an embodiment of the present invention comprises: a storage tank for storing liquefied gas; a support member supporting the storage tank; an insulation panel installed on an outer wall of the storage tank adjacent to the support member; an injection foam injected between the support member and the insulation panel; and a foam insulation layer covering the outer wall of the storage tank, the insulation panel, and the injection foam, thereby capable of securing stability by preventing cracks and gaps from occurring in the insulation layer adjacent to the support member supporting the storage tank.

Description

CONTAINMENT SYSTEM AND MANUFACTURING METHOD THEREOF

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

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

Liquefied natural gas is obtained by cooling natural gas to cryogenic temperatures (approximately -163° C.), which must be stored and transported at this temperature. Therefore, it is necessary to insulate the storage tank in order to lower the loss of liquefied natural gas by evaporation.

If, during transport, the storage tank is not sufficiently insulated, the pressure inside the storage tank rises, which threatens the safety of the vessel. In addition, if the storage tank is not sufficiently insulated, the liquefied natural gas stored in the storage tank is evaporated, and even the properties of the liquefied natural gas may be changed, thereby reducing the commercial value.

A storage tank for storing liquefied natural gas in a cryogenic state is installed in offshore structures such as LNG carriers, LNG RVs, LNG FPSOs, and LNG FSRUs that transport or store liquid cargo such as LNG at sea.

The LNG storage tank can be typically classified into an independent type and a membrane type. And, the membranous storage tank is divided into GTT NO 96, Mark Ⅲ and CS1, and the independent storage tank is divided into MOSS type and SPB type.

The independent storage tank is composed of a storage tank made of aluminum, stainless steel, steel alloy, etc., and an insulating material attached to the outer wall of the storage tank. The insulating material may be composed of an insulating panel, or may be composed of a foamed insulating layer formed by a spray method.

Such an independent storage tank requires a support member for mounting it on the bottom of a hull in a ship or offshore structure. Cracks, cracks, and gaps may occur in the insulating layer adjacent to the non-insulated support member due to the difference in temperature and coefficient of thermal expansion, etc. . Therefore, it may cause a large loss.

In one embodiment of the present invention, it is an object of the present invention to provide a containment system capable of securing stability by preventing cracks, cracks, gaps, etc. from occurring in a heat insulating layer adjacent to a support member supporting a storage tank, and a method for manufacturing the same.

A containment system according to an embodiment of the present invention includes a storage tank for storing liquefied gas; a support member supporting the storage tank; an insulating panel installed on an outer wall of the storage tank adjacent to the support member; an injection foam injected between the support member and the thermal insulation panel; and a foam insulation layer covering the outer wall of the storage tank, the insulation panel, and the injection foam.

It may further include a first fixture for fixing the insulation panel to the outer wall of the storage tank.

The first fixture is fixed to the outer wall of the storage tank and includes a first stud bolt passing through the heat insulating panel, a first fixing washer fastened to the first stud bolt on the heat insulating panel, and the first fixing washer on the first fixing washer. 1 may include a first fixing nut fastened to the stud bolt.

An adhesive member formed between the outer wall of the storage tank and the heat insulating panel to adhere the heat insulating panel to the outer wall of the storage tank may be further included.

Further comprising a crack barrier covering the outer surface of the insulation panel, the crack barrier may cover the injection foam.

The crack barrier may be any one selected from glass cloth and glass mesh.

The foam insulation layer may include a first foam insulation layer covering the outer wall of the storage tank, and a second foam insulation layer covering the injection foam, the insulation panel, and the first foam insulation layer.

Further comprising a second fixture for fixing the first foam insulation layer and the second foam insulation layer to the outer wall of the storage tank, the second fixture is fixed to the outer wall of the storage tank, the first foam insulation layer and the second A second stud bolt passing through the foam insulation layer, a second fixing washer fastened to the second stud bolt on the second foam insulation layer, and a second fixing nut fastened to the second stud bolt on the second fixing washer can do.

The foam insulation layer may further include a third foam insulation layer covering the second foam insulation layer and the second fixture.

It may further include a third crack barrier positioned between the second foam insulation layer and the third foam insulation layer.

The third crack barrier may include a metal matrix composite.

The thermal insulation panel may have better dimensional stability or long-term thermal resistance than the foam insulation layer.

In addition, the manufacturing method of the containment system according to an embodiment of the present invention comprises the steps of fixing a storage tank for storing liquefied gas to a support member; installing an insulating panel on an outer wall of the storage tank adjacent to the support member; injecting an injection foam between the support member and the thermal insulation panel; and forming a foam insulation layer covering the outer wall of the storage tank, the insulation panel, and the injection foam.

The method may further include fixing the heat insulation panel to the outer wall of the storage tank using a first fixture.

The foam insulation layer may be formed by a spray method.

The method may further include fixing the foam insulation layer to the outer wall of the storage tank using a second fixture.

According to one embodiment of the present invention, an insulating panel is formed on the outer wall of the storage tank adjacent to the supporting member supporting the storage tank, and the injection foam is injected between the supporting member and the insulating panel, and the foam covering the injection foam and the insulating panel. By forming the heat insulation layer, it is possible to disperse or reduce deformation of the foam insulation layer during contraction or expansion due to a temperature difference between the storage tank for storing the cryogenic gas and the support member. Therefore, it is possible to secure stability by preventing the occurrence of cracks, cracks, and gaps due to fatigue of the foam insulation layer.

In addition, by additionally forming an injection foam and a thermal insulation panel in addition to the foam insulation layer on the outer wall of the storage tank located adjacent to the support member, the insulation of the outer wall of the storage tank adjacent to the support member is sufficiently achieved to cause cracks and cracks in the foam insulation layer , or it is possible to prevent cold air from leaking from the storage tank to the outside or external heat from flowing into the inside of the storage tank due to generation of a gap. Therefore, the pressure inside the storage tank can be kept constant.

1 is a schematic cross-sectional view of a containment system according to an embodiment of the present invention;
FIG. 2 is an enlarged view of part A of FIG. 1 .
FIG. 3 is an enlarged view of part B of FIG. 2 .
4 is an enlarged perspective view of the heat insulating panel of FIG. 2 ;
5 is a flowchart of a method of manufacturing a containment system according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, the embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

1 is a schematic cross-sectional view of a containment system according to an embodiment of the present invention, FIG. 2 is an enlarged view of part A of FIG. 1 , and FIG. 3 is an enlarged view of part B of FIG. 2 .

1 , 2 and 3 , the containment system according to an embodiment of the present invention includes a storage tank 100 , a support member 200 , an insulation panel 300 , and an injection foam ( 400 ), a first fixture 500 , a foam insulation layer 600 , and a second fixture 700 .

The storage tank 100 may store liquefied gas in an enclosed space therein, and may be an independent storage tank. In the present embodiment, the storage tank 100 is formed in a cylindrical type, but is not necessarily limited thereto, and may be formed in various shapes such as a spherical type and a prismatic type. The storage tank 100 may be made of a metal such as aluminum, stainless steel, or a steel alloy.

The support member 200 supports the storage tank 100 , and may fix the storage tank 100 to the hull of a ship or the like. The support member 200 may be connected to the outer wall 110 of the storage tank 100 . In the present embodiment, two support members 200 support the storage tank 100 , but the present invention is not limited thereto, and various number of support members 200 may support the storage tank 100 .

2 and 3 , the heat insulation panel 300 may be installed on the outer wall 110 of the storage tank 100 adjacent to the support member 200 . The heat insulation panel 300 may be spaced apart from the support member 200 by a predetermined distance to surround the support member 200 and may be installed on the outer wall 110 of the storage tank 100 .

4 is an enlarged perspective view of the heat insulating panel of FIG. 2 ;

2 to 4, the heat insulation panel 300 is formed on the first heat insulation panel 310 facing the outer wall 110 of the storage tank 100, and the first heat insulation panel 310, and The second insulation panel 320 having a size smaller than that of the first insulation panel 310 may be included. In this embodiment, the heat insulation panel 300 is formed in a double panel structure of the first heat insulation panel 310 and the second heat insulation panel 320, but the present invention is not limited thereto, and various structures are possible.

The first insulation panel 310 and the second insulation panel 320 may be formed of expanded polystyrene (EPS). In the present embodiment, the first heat insulating panel 310 and the second heat insulating panel 320 are formed to have a cross section of a square shape or a trapezoid shape, but are not necessarily limited thereto, and may be formed in various shapes. In addition, the first insulation panel 310 and the second insulation panel 320 may have a shape corresponding to the curved surface of the outer wall 110 of the storage tank 100 . An adhesive member 10 may be formed between the outer wall 110 of the storage tank 100 and the heat insulation panel 300 . The adhesive member 10 may adhere the heat insulation panel 300 to the outer wall 110 of the storage tank 100 and may include glue.

A crack barrier 20 covering the outer surface of the heat insulation panel 300 may be further formed. The crack barrier 20 may include at least one of glass cloth and glass mesh. The crack barrier 20 may be adhered to the outer surface of the heat insulation panel 300 using a separate adhesive member (eg, glue). The crack barrier 20 is a first crack barrier 21 formed between the first heat insulation panel 310 and the second heat insulation panel 320, and a second crack barrier formed on the outer surface of the second heat insulation panel 320 ( 22), and may include .

The injection foam 400 may be injected between the support member 200 and the heat insulation panel 300 . That is, the gap between the support member 200 and the heat insulation panel 300 may be filled by the injection foam 400 . The injection foam 400 may be elastically deformed during contraction or expansion of the storage tank 100 to prevent damage to the foam insulation layer 600 , and to maintain the insulation function of the foam insulation layer 600 as it is. At this time, the second crack barrier may cover the injection foam 400 .

The injection foam 400 may be formed of the same material as the foam insulation layer 600 . That is, the injection foam 400 may include polyurethane.

The first fixture 500 may fix the heat insulation panel 300 to the outer wall 110 of the storage tank 100 . The first fixture 500 may include a first stud bolt 510 , a first fixing washer 520 , and a first fixing nut 530 .

The first stud bolt 510 is fixed to the outer wall 110 of the storage tank 100 by welding or the like, and may penetrate the heat insulation panel 300 .

The first stud bolt 510 includes a first stud 511 having a female screw shape fixed to the outer wall of the storage tank 100 , and a first tread bar 512 having a male screw shape coupled to the first stud 511 . can do. The first tread bar 512 may extend the length of the first stud bolt 510 .

The first fixing washer 520 may be fastened to the first stud bolt 510 on the heat insulation panel 300 . The first fixing washer 520 may be made of any one of urethane rubber, plywood, and plastic, and may have a relatively large diameter to secure a sufficient contact area with the heat insulating panel 300 .

The first fixing nut 530 may be fastened to the first stud bolt 510 on the first fixing washer 520 . The first fixing washer 520 strongly presses the heat insulation panel 300 by the fastening force of the first fixing nut 530 to firmly fix the insulation panel 300 to the outer wall 110 of the storage tank 100 .

The foam insulation layer 600 is formed by a spray method and may cover the outer wall 110 of the storage tank 100 , the insulation panel 300 , and the injection foam 400 . The foam insulation layer 600 may include polyurethane, and may be manufactured by mixing and spraying polyol and isocyanate on the outer wall 110 of the storage tank 100 with a spray gun. Polyol and isocyanate are contained in their respective containers, pumped through a hose with a spray gun and mixed, and a mixture thereof is sprayed on the outer wall 110 of the storage tank 100 . The sprayed mixture adheres to the outer wall 110 of the storage tank 100 and begins to expand. During the expansion process, the mixture is transformed into a hard porous structure to create a cellular foam with enhanced thermal insulation, while creating a storage tank 100 ) is permanently fixed to the outer wall (110).

At this time, since the heat insulation panel 300 formed of expanded polyesterene has better dimensional stability and long-term thermal resistance than the foam insulation layer 600 , cracks, cracks and gaps due to fatigue of the foam insulation layer 600 can be prevented. there is.

The foam insulation layer 600 may include a first foam insulation layer 610 , a second foam insulation layer 620 , and a third insulation foam insulation layer 630 .

The first foam insulation layer 610 may cover the outer wall 110 of the storage tank 100 . The first foam insulation layer 610 is a first lower foam insulation layer 611 formed on the same layer with the same height as the first insulation panel 310 , and the second insulation panel 320 is formed on the same layer with the same height as the insulation panel 320 . It may include a first upper foam insulation layer (612). A first crack barrier 21 is positioned between the first lower foam insulation layer 611 and the first upper foam insulation layer 612, and a second crack barrier 22 is positioned on the outer surface of the first upper foam insulation layer 612. can

The second foam insulation layer 620 may cover the injection foam 400 , the insulation panel 300 , and the first foam insulation layer 610 . In this case, the second foam insulation layer 620 may cover the first fixing washer 520 and the first fixing nut 530 of the first fixture 500 exposed to the outer surface of the first foam insulation layer 610 together.

The third foam insulation layer 630 may cover the second foam insulation layer 620 . A third crack barrier 23 may be positioned between the second foam insulation layer 620 and the third foam insulation layer 630 . The third crack barrier 23 may be made of a metal matrix composite (COMPOSITE METAL MATRIX). The metal matrix composite (COMPOSITE METAL MATRIX) may include a stainless steel wire mesh (SUS-Mesh).

The second fixture 700 may fix the first foam insulation layer 610 and the second foam insulation layer 620 to the outer wall 110 of the storage tank 100 . The second fixture 700 may fix the second foam insulation layer 620 on the third crack barrier 23 . A plurality of second fixtures 700 are provided on the outer wall 110 of the storage tank 100 at a distance from each other. The second fastener 700 may include a second stud bolt 710 , a second fixing washer 720 , and a second fixing nut 730 .

The second stud bolt 710 is fixed to the outer wall 110 of the storage tank 100 by welding or the like, and may penetrate the first foam insulation layer 610 and the second foam insulation layer 620 .

The second stud bolt 710 may include a first stud 711 having a female screw shape fixed to the outer wall of the storage tank 100, and a second tread bar 712 having a male screw shape coupled to the stud 711. there is. The second tread bar 712 may extend the length of the second stud bolt 710 .

The second fixing washer 720 may be fastened to the second stud bolt 710 on the second foam insulation layer 620 . The second fixing washer 720 may be made of any one of urethane rubber, plywood, and plastic, and may have a relatively large diameter to secure a sufficient contact area with the second foamed heat insulating layer 620 .

The second fixing nut 730 may be fastened to the second stud bolt on the second fixing washer. By the fastening force of the second fixing nut 730, the second fixing washer 720 strongly presses the first foam insulation layer 610 and the second foam insulation layer 620 while the first foam insulation layer 610 and the second foam insulation layer ( 620 is firmly fixed to the outer wall 110 of the storage tank 100 .

The third foam insulation layer 630 may cover the second fixing washer 720 and the second fixing nut 730 of the second fastener 700 exposed to the outer surface of the second foam insulation layer 620 .

In this way, the containment system according to an embodiment of the present invention forms and supports the insulation panel 300 on the outer wall 110 of the storage tank 100 adjacent to the support member 200 supporting the storage tank 100 . By injecting the injection foam 400 between the member 200 and the insulation panel 300, and forming the foam insulation layer 600 covering the injection foam 400 and the insulation panel 300, a storage tank for storing cryogenic gas Deformation of the foam insulation layer 600 may be dispersed or reduced during contraction or expansion due to a temperature difference between 100 and the support member 200 . At this time, since the heat insulation panel 300 formed of expanded polyesterene has better dimensional stability and long-term thermal resistance than the foam insulation layer 600 , it prevents cracks, cracks and gaps due to fatigue of the foam insulation layer 600 from occurring, thereby providing stability can be obtained

In addition, in the containment system according to an embodiment of the present invention, in addition to the foam insulation layer 600 on the outer wall 110 of the storage tank 100 at a position adjacent to the support member 200, the injection foam 400 and the insulation panel 300 By additionally forming a storage tank ( It is possible to prevent cold air from leaking out from the 100 ) or external heat from flowing into the inside of the storage tank 100 . Accordingly, the pressure inside the storage tank 100 may be constantly maintained.

Meanwhile, the foam insulation layer 600 may be covered with the flexible protective layer 800 . The flexible protective layer 800 may be formed of a semi-flexible coating layer or semi-flexible mastic. The flexible protective layer 800 may be formed by spraying and curing the coating composition on the outer surface of the foam insulation layer 600 using appropriate tools and equipment, or by applying and curing the mastic composition. The coating material composition may be a polyurethane-based composition.

Hereinafter, a method of manufacturing a containment system according to an embodiment of the present invention will be described in detail with reference to the drawings.

5 is a flowchart of a method of manufacturing a containment system according to an embodiment of the present invention.

As shown in FIG. 5 , first, the storage tank 100 for storing the liquefied gas is fixed to the support member 200 ( S10 ).

Next, the heat insulation panel 300 may be installed on the outer wall 110 of the storage tank 100 adjacent to the support member 200 and surrounding the support member 200 ( S20 ). In this case, the heat insulation panel 300 may be fixed to the outer wall 110 of the storage tank 100 using the first fixture 500 . That is, a welding point for welding is marked on the outer wall 110 of the storage tank 100 , and the first stud bolt 510 is fixed to the welding point of the outer wall 110 of the storage tank 100 by a method such as welding. and, after penetrating the insulation panel 300 through the first stud bolt 510 , the insulation panel 300 is fixed and fastened using the first fixing washer 520 and the first fixing nut 530 .

Next, the injection foam 400 may be injected between the support member 200 and the heat insulation panel 300 ( S30 ). Therefore, it is possible to improve the stability of the foam insulation layer 600 by blocking the occurrence of cracks or gaps during contraction and expansion of the storage tank 100 .

Next, the foam insulation layer 600 covering the outer wall 110 of the storage tank 100 , the insulation panel 300 , and the injection foam 400 may be formed (S40). In this case, the foam insulation layer 600 may be formed by a spray method. By forming the foam insulation layer 600 by a spray method, it is possible to more effectively insulate the storage tank 100 . In this case, the foam insulation layer 600 may be fixed to the outer wall 110 of the storage tank 100 by using the second fixture 700 .

In the above, the present invention has been described with reference to the embodiments shown in the drawings. However, the present invention is not limited thereto, and various modifications or other embodiments within the scope equivalent to the present invention are possible by those of ordinary skill in the art to which the present invention pertains. Accordingly, the true scope of protection of the present invention should be defined by the following claims.

100: storage tank 200: support member
300: thermal insulation panel 400: injection foam
500: first fixture 600: foam insulation layer
700: second fixture

Claims (16)

storage tanks for storing liquefied gas;
a support member supporting the storage tank;
an insulation panel adjacent to the support member and surrounding the support member and installed on an outer wall of the storage tank;
an injection foam injected between the support member and the thermal insulation panel;
a foam insulation layer covering the outer wall of the storage tank, the insulation panel, and the injection foam;
a first fixture for fixing the heat insulation panel to the outer wall of the storage tank; And
A second fixture for fixing the foam insulation layer to the outer wall of the storage tank
including,
The injection foam is formed of the same material as the foam insulation layer,
The foam insulation layer is
A first foam insulation layer covering the outer wall of the storage tank, and
A second foam insulation layer covering the injection foam, the insulation panel, and the first foam insulation layer
including,
The second fixture is
A second stud bolt fixed to the outer wall of the storage tank and penetrating the first foam insulation layer and the second foam insulation layer;
A second fixing washer fastened to the second stud bolt on the second foam insulation layer, and
a second retaining nut fastened to the second stud bolt over the second retaining washer
A containment system comprising a. delete According to claim 1,
The first fixture is
a first stud bolt fixed to the outer wall of the storage tank and penetrating the heat insulation panel;
a first fixing washer fastened to the first stud bolt on the thermal insulation panel, and
a first retaining nut fastened to the first stud bolt over the first retaining washer
A containment system comprising a. According to claim 1,
and an adhesive member formed between the outer wall of the storage tank and the heat insulating panel to adhere the heat insulating panel to the outer wall of the storage tank. 5. The method of claim 4,
Further comprising a crack barrier covering the outer surface of the insulation panel,
and the crack barrier covers the injection foam. 6. The method of claim 5,
The crack barrier is any one selected from glass cloth and glass mesh. delete delete 4. The method of claim 3,
The foam insulation layer further comprises a third foam insulation layer covering the second foam insulation layer and the second fixture. 10. The method of claim 9,
The containment system further comprising a third crack barrier positioned between the second foam insulation layer and the third foam insulation layer. 11. The method of claim 10,
and wherein the third crack barrier comprises a metal matrix composite. According to claim 1,
The insulation panel is a containment system superior in dimensional stability or long-term thermal resistance than the foam insulation layer. fixing the storage tank for storing the liquefied gas to the support member;
installing an insulating panel on an outer wall of the storage tank adjacent to the supporting member and surrounding the supporting member;
injecting an injection foam between the support member and the thermal insulation panel;
forming a foam insulation layer covering the outer wall of the storage tank, the insulation panel, and the injection foam;
fixing the heat insulation panel to the outer wall of the storage tank using a first fixture; And
Fixing the foam insulation layer to the outer wall of the storage tank using a second fixture
including,
The injection foam is formed of the same material as the foam insulation layer,
The foam insulation layer is
A first foam insulation layer covering the outer wall of the storage tank, and
A second foam insulation layer covering the injection foam, the insulation panel, and the first foam insulation layer
including,
The second fixture is
A second stud bolt fixed to the outer wall of the storage tank and penetrating the first foam insulation layer and the second foam insulation layer;
A second fixing washer fastened to the second stud bolt on the second foam insulation layer, and
a second retaining nut fastened to the second stud bolt over the second retaining washer
A method of manufacturing a containment system comprising a. delete 14. The method of claim 13,
The method of manufacturing the containment system in which the foam insulation layer is formed by a spray method. delete

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