KR20220025530A - Insulation system of liquefied gas storage tank - Google Patents

Abstract

Disclosed is an insulation system of a liquefied gas storage tank. In accordance with the present invention, the insulation system of a liquefied gas storage tank includes: an insulation wall comprising a plurality of lower insulation panels, a plurality of upper insulation panels placed in upper areas of the lower insulation panels, and a bridge panel placed in a space between upper insulation panels adjacent to each other to cover a space between the lower insulation panels adjacent to each other; a secondary sealing wall of a composite material installed in an upper part of the insulation wall; a plywood layer installed in an upper part of the secondary sealing wall; and a primary sealing wall installed in an upper part of the plywood layer. The secondary sealing wall includes: a flat secondary barrier made of a flat sheet and attached to upper sides of the upper insulation panels and the bridge panel; and a corrugated secondary barrier having both side wing parts attached to an upper side of the circumference of the flat secondary barrier, and including a corrugated part projected downward between the both side wing parts. The corrugated part is housed in a groove formed in a boundary part between the upper insulation panels and the bridge panel. Therefore, the present invention is capable of securing the structural stability of the liquefied gas storage tank.

Description

Insulation system of liquefied gas storage tank {INSULATION SYSTEM OF LIQUEFIED GAS STORAGE TANK}

The present invention relates to a thermal insulation system for a liquefied gas storage tank, and more particularly, by locating the secondary sealing wall made of a composite material at the top level of the insulating wall rather than between the insulating walls, the risk of leakage of the secondary sealing wall is eliminated And it relates to a thermal insulation system of a liquefied gas storage tank having an advantageous effect in terms of constructability and economics.

Natural gas is transported in gaseous form through onshore or offshore gas pipelines or stored in LNG carriers as liquefied natural gas (hereinafter 'LNG') and transported to remote consumers. LNG is obtained by cooling natural gas to a cryogenic temperature (about -163°C), and its volume is reduced to about 1/600 of that of gaseous natural gas, so it is very suitable for long-distance transportation by sea.

A storage tank (commonly referred to as a 'cargo hold') that can withstand the cryogenic temperature of LNG is installed in a structure for transporting or storing LNG, such as an LNG carrier for loading and unloading LNG to an onshore destination by operating the sea with LNG.

LNG storage tanks can be classified into independent type and membrane type depending on whether the load of cargo acts directly on the insulation. In general, the membrane type storage tank is divided into NO 96 type and MARK Ⅲ type of GTT, and the independent storage tank is divided into the MOSS type and IHI-SPB type.

In general, the membranous storage tank consists of a double sealing structure in which a secondary insulating wall, a secondary sealing wall, a primary insulating wall and a primary sealing wall are sequentially stacked on the inner wall of the hull.

In the NO 96 storage tank, the primary and secondary sealing walls are made of 0.5 to 0.7 mm thick Invar steel (36% nickel steel) membrane, and the primary and secondary insulating walls are plywood boxes. It is composed of insulation boxes filled with insulation materials such as perlite powder or glass wool.

In the NO 96 storage tank, the primary sealing wall and the secondary sealing wall have almost the same level of liquid-tightness and strength.

In addition, the NO 96 storage tank is made in the form of filling the inside of the insulating wall wooden box with insulating material, so it can have high compressive strength and rigidity compared to the MARK Ⅲ type storage tank, and the welding is easy and the automation rate is high.

On the other hand, in the MARK Ⅲ type storage tank, the primary sealing wall is made of a stainless steel (SUS) membrane with a thickness of about 1.2 mm, and a triplex is applied as the secondary sealing wall. And the primary and secondary insulation walls are composed of insulation panels in the form of bonding wooden plywood to the upper or lower surfaces of polyurethane foam (PUF).

The primary sealing wall of the MARK Ⅲ type storage tank has corrugated corrugations to absorb heat shrinkage caused by LNG in cryogenic state.

MARK Ⅲ The storage tank has disadvantages in terms of installation/manufacturing due to the low welding automation rate of the primary sealing wall with corrugation, but compared to Invar steel membrane, stainless steel membrane and triplex are cheaper and easier to install, and polyurethane foam It has the advantage of excellent thermal insulation effect.

1 is a conventional MARK Ⅲ type It is a diagram schematically showing the structure of the insulation system of the storage tank.

Referring to Figure 1, the conventional MARK Ⅲ type The insulation system of the storage tank, the lower insulation panel 10, the secondary sealing wall (20: 21, 22), and the upper insulation panel 30 and the primary sealing wall 40 from the inner wall of the hull (H) are sequentially has a laminated form.

The lower insulation panel 10 is fixed to the inner surface of the hull H by epoxy mastic and stud bolts, and the upper insulation panel 30 is between the lower insulation panel 10 and the lower insulation panel 10 . It is fixed in an adhesive manner through the secondary sealing wall 20 interposed therebetween.

In the conventional MARK Ⅲ type storage tank, the primary sealing wall 40 is made of a stainless steel (SUS) membrane having a thickness of about 1.2 mm, and a material called triplex is applied as the secondary sealing wall 20 . At this time, the primary sealing wall 40 is in direct contact with LNG to perform liquid-tightness, so it is common to have corrugated corrugations to absorb heat shrinkage due to cryogenic temperatures.

On the other hand, the conventional MARK Ⅲ type storage tank is configured to cover the boundary between the lower insulation panels 10 by disposing the bridge panel 31 between the upper insulation panels 30 for structural complementation at the boundary between the panels. .

Installation of the bridge panel 31, after attaching a supple triplex (22) on the rigid triplex (Rigid triplex, 21) attached to the upper portion of the lower insulating panel (10), and then the bridge on it again It is made in such a way that the panel 31 is attached.

The upper surface of the bridge panel 31 is formed on the same plane as the upper surface of the upper heat insulating panel 30, and the primary sealing wall 40 is installed on the upper heat insulating layer consisting of the upper heat insulating panel 30 and the bridge panel 31. This completes the insulation system of the storage tank.

However, as described above, the conventional MARK Ⅲ type storage tank has a structure in which the rigid triplex 21 and the supple triplex 22 are bonded using an adhesive. When this occurs, it is difficult to maintain perfect airtightness, and the adhesive surface may be separated over time, and there are disadvantages of poor reliability.

In addition, the insulation panels installed inside the storage tank undergo heat shrinkage due to the cryogenic state. At this time, as indicated by the arrow in the drawing, the heat shrinkage direction of the lower heat insulation panel 10 and the heat shrinkage direction of the bridge panel 31 are opposite to each other. Therefore, the stress is concentrated on the auxiliary barrier (supple triplex, 22) installed on the boundary portion, there is a high risk of damage.

In addition, in the conventional MARK Ⅲ type storage tank, the secondary sealing wall 20 is between the lower heat insulating layer comprising the lower heat insulating panels 10 and the upper heat insulating layer comprising the upper heat insulating panel 30 and the bridge panel 31 . Because the installation process is complicated, it takes a lot of time to work, and when LNG leakage occurs at the bonding part of the rigid triplex 21 and the supple triplex 22, it takes a lot of time and money to maintain it. There is this.

Korean Patent Publication No. 10-2009-0096901 (2009. 09. 15.)

As described above, the conventional system in which the secondary sealing wall of the composite material is interposed between the upper and lower insulating layers has a risk of leakage from the secondary sealing wall. Applying a composite material can be very advantageous in terms of constructability and economics.

Therefore, the present invention proposes a new structure that can solve the concern of leakage of the secondary sealing wall of the composite material, so that it is possible to apply the composite material as the secondary sealing wall, thereby having an advantage in constructability and economical aspects. An object of the present invention is to provide an insulation system for a liquefied gas storage tank.

According to an aspect of the present invention for achieving the above object, a plurality of lower heat insulating panels, an upper heat insulating panel disposed within an upper area of the lower heat insulating panel, and the upper heat insulating panel disposed in a gap between the adjacent upper heat insulating panels a heat insulating wall comprising a plurality of layers including a bridge panel covering the gap between the adjacent lower heat insulating panels; a secondary sealing wall made of a composite material installed on the insulating wall; a plywood layer installed on the second sealing wall; and a primary sealing wall installed on the upper portion of the plywood layer, wherein the secondary sealing wall is made of a flat sheet and is attached to the upper surface of the upper insulating panel and the bridge panel; and a corrugated secondary barrier having both wing portions attached to the upper surface of the edge of the flat secondary barrier, and including corrugated portions protruding downward between the both wing portions, wherein the corrugated portion is formed between the upper insulating panel and the An insulation system of a liquefied gas storage tank can be provided, characterized in that it is accommodated in the groove formed in the boundary between the bridge panels.

A chamfer portion for preventing interference with the wrinkle portion is formed at upper corners of the upper insulation panel and the bridge panel, and the groove is formed by a space in which the upper insulation panel and the chamfer portion formed on the bridge panel face each other. can

The flat secondary barrier is fixed to the upper surface of the upper insulating panel and the bridge panel except for the chamfer, and the wing portions of the both sides of the corrugated secondary barrier are the upper surface of the edge of the flat secondary barrier. can be fixed by adhesive.

The secondary sealing wall may be made of a triplex material made of a combination of aluminum foil and glass fiber.

The plywood layer may include: a first plywood layer installed on the flat-type secondary barrier and disposed on the flat-type secondary barrier in an area excluding the portion to which the corrugated secondary barrier is attached; and a second plywood layer installed on the corrugated secondary barrier.

The primary sealing wall may be made of any one of low-temperature steel including stainless steel, Invar steel, and aluminum alloy.

According to the present invention, by locating the secondary sealing wall at the top level of the insulating wall rather than between the insulating walls, the risk of leakage of the secondary sealing wall is eliminated and the insulation of the liquefied gas storage tank having advantageous effects in terms of constructability and economics system can be provided.

In addition, in the present invention, in providing a thermal insulation system having a novel structure as described above, by realizing a structure of a secondary sealing wall capable of flexible behavior even during thermal contraction due to cryogenic temperatures, the risk of leakage from the secondary sealing wall is more reliably resolved. and the structural stability of the liquefied gas storage tank can be secured.

1 is a conventional MARK Ⅲ type It is a diagram schematically showing the structure of the insulation system of the storage tank.
Figure 2 is a view schematically showing the structure of the insulation system of the liquefied gas storage tank according to the present invention.
Figure 3 is a view schematically showing a more improved structure of the insulation system of the liquefied gas storage tank according to the present invention.
FIG. 4 is a view for explaining a method of installing and connecting a secondary sealing wall in the improved structure shown in FIG. 3 .

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

In the present specification, the liquefied gas storage tank includes LNG, which is the most representative liquefied gas, LPG (Liquefied petroleum gas), LEG (Liquefied Ethane Gas), liquefied ethylene gas (Liquefied Ethylene Gas), liquefied propylene gas (Liquefied Propylene Gas), etc. It may include all of the storage tanks for storing various types of liquefied gas that can be stored/transported by being liquefied at a low temperature.

The use of the terms 'primary' and 'secondary' in the present invention is based on the LNG stored in the storage tank, primarily sealing or insulating the LNG, or secondary sealing or insulation. It is used as a classification criterion for

Also, customarily the terms 'up' or 'above' applied to elements of a tank refer to the direction towards the inside of the tank, irrespective of the direction to gravity; Regardless of the direction, it points toward the outside of the tank.

Hereinafter, the present invention will be described in detail by describing preferred embodiments of the present invention with reference to the accompanying drawings. Like reference numerals in each figure indicate like elements.

Figure 2 is a view schematically showing the structure of the insulation system of the liquefied gas storage tank according to the present invention.

Referring to Figure 2, the insulation system of the liquefied gas storage tank according to the present invention, the insulation wall 100 installed on the inner wall of the hull (H), and the secondary sealing wall 200 installed on the upper portion of the insulation wall, 2 It includes a plywood layer 300 installed on the car sealing wall 200 and a primary sealing wall 400 installed on the plywood layer 300 .

The insulating wall 100 may include an insulating material made of polyurethane foam or reinforced polyurethane foam (R-PUF: Reinforced Polyurethane Foam). A composite material such as Fiber Reinforced Plastics (FRP) may be provided in a composite form.

The heat insulating wall 100 may be formed in at least two or more multi-layer structures, and in the present invention, it is a preferred embodiment that the heat insulating wall 100 is composed of two layers including the lower heat insulating layer 110 and the upper heat insulating layer 120 . presented as

Specifically, the lower heat insulating layer 110 of the heat insulating wall 100 may be composed of a plurality of lower heat insulating panels 111, and a plurality of lower heat insulating panels 111 processed in a certain shape (eg, a hexahedral shape) are formed. The lower heat insulating layer 110 may be configured by being sequentially arranged along the transverse and longitudinal directions on the inner wall of the hull (H).

More specifically, the lower insulating panel 111 may be manufactured in a form in which a protective plate (lower plate) made of plywood or a composite material is adhered to the lower surface of an insulating material made of polyurethane foam or reinforced polyurethane foam, and the hull (H ) It can be connected to the hull (H) by an adhesive material such as mastic or resin applied to the inner wall.

The upper heat insulating layer 120 of the heat insulating wall 100 may include a plurality of upper heat insulating panels 121 and bridge panels 122 . The upper heat insulating panel 121 and the bridge panel 122 may be formed by processing a heat insulator made of polyurethane foam or reinforced polyurethane foam into a predetermined shape (eg, a hexahedral shape). The upper insulating panel 121 and the bridge panel 122 may be formed of only a foam insulating material, and may be fixed to the upper surface of the lower insulating panel 111 in an adhesive manner.

The upper heat insulating panel 121 may have a smaller cross-sectional area than the lower heat insulating panel 111 and may be disposed within the area of the lower heat insulating panel 111 . In this case, the distances from the four corners of the lower heat insulating panel 111 to each corner of the upper heat insulating panel 121 may be formed to be the same.

The bridge panel 122 is disposed between the adjacent upper heat insulating panels 121 to cover the boundary between the adjacent lower heat insulating panels 111 . Accordingly, the bridge panel 122 may be manufactured to have a size corresponding to the spacing between the adjacent upper insulating panels 121 .

As will be described later, in the present invention, since a sealing wall is not installed between the lower heat insulating layer 110 and the upper heat insulating layer 120, it is necessary to install an auxiliary barrier (supple triplex) at the lower part of the bridge panel as in the existing system (refer to FIG. 1). there is no Therefore, in the present invention, the upper heat insulating panel 121 and the bridge panel 122 constituting the upper heat insulating layer 120 may be manufactured to have the same thickness, and the same member (not only the thickness but also the width and length for the convenience of manufacturing and construction) It is also possible to be produced in the same form).

In addition, in the present invention, the upper heat insulating panel 121 among the configuration of the upper heat insulating layer 120 may be manufactured and produced as an integral module with the lower heat insulating panel 111 . As described above, since a separate sealing wall is not installed between the lower heat insulating layer 110 and the upper heat insulating layer 120, the lower heat insulating panel 111 and the upper heat insulating panel 121 can be connected by directly bonding the opposite surfaces. Therefore, it is very easy to manufacture and produce the two heat insulation panels 111 and 121 as an integrated module.

The lower insulation panel 111 and the upper insulation panel 121 can be stocked after the production is completed as an integrated module from the outside, and the installation of the upper and lower insulation panels 111 and 121 by installing the integrated module on the inner wall of the hull (H) Operations can be performed simultaneously. When the installation of the integrated module is completed, the construction of the insulation wall 100 may be completed by installing the bridge panel 122 between the upper insulation panels 121 adjacent to each other.

As such, the present invention eliminates the process of installing a sealing wall between the upper and lower heat insulating layers in the existing system, forms a thick heat insulating wall 100 as a whole, and forms the secondary sealing wall 200 and the primary sealing wall 400 thereon. are installed sequentially.

At this time, if the insulating wall 100 is formed as a single layer, heat loss due to convection may occur at the boundary between the panels, and structural weakness may occur even in the vertical direction deformation of the panel due to hull deflection, In the present invention, a structure in which the heat insulating wall 100 is formed in at least two or more multi-layer structures and the interface of the lower heat insulating layer 110 is covered with the bridge panel 122 of the upper heat insulating layer 120 is applied.

According to the structure of the present invention, it is possible to reduce heat loss due to heat intrusion (convection) occurring at the boundary between the adjacent lower insulation panels 111, and also the upper and lower insulation panels 111 and 121 due to the deformation of the hull. It has the advantage of being able to move flexibly even in the vertical direction of deformation.

In addition, the present invention can simplify the complicated installation process of installing the sealing wall between the heat insulating layers by eliminating the process of installing the sealing wall between the upper and lower heat insulating layers 110 and 120, and the heat shrinkage direction of the upper and lower heat insulating panels is As it is formed differently, it is also possible to solve the problem of concentration of stress on the secondary sealing wall interposed therebetween.

The secondary sealing wall 200 installed on the upper part of the insulating wall 100 may be composed of a composite material such as a triplex made of a combination of aluminum foil and glass fiber, It may be fixed to the top by an adhesive method.

The plywood layer 300 installed on the upper portion of the secondary sealing wall 200 may be composed of a single plywood material, as can be seen from the term, but is not limited thereto, and is not limited to: Glass Fiber Mat Reinforced Thermoplastics (GMT) and It is also possible to use the same composite material or high-density polyurethane foam.

The plywood layer 300 may be fixed to the upper portion of the secondary sealing wall 200 by an adhesive method or a mechanical fastening method.

In addition, a metal plate (not shown) may be installed on the plywood layer 300 so that the primary sealing wall 400 to be described later can be fixed by welding. The metal plate (not shown) may be seated in a groove formed on the upper surface of the plywood layer 300 and fixed by a fastening member such as a rivet or a screw.

The primary sealing wall 400 installed on the upper part of the plywood layer 300 is in direct contact with the cryogenic liquefied gas to perform primary airtightness, and is brittle at low temperature to cope with the stress change caused by the liquefied gas. It may be made of a strong metal material, and preferably, low-temperature steel such as stainless steel, Invar steel, or aluminum alloy may be used.

When the primary sealing wall 400 is made of a stainless steel membrane, a plurality of corrugated corrugations may be formed on the membrane to absorb heat shrinkage due to cryogenic temperatures.

The primary sealing wall 400 may be composed of a plurality of metal membrane sheets, and the metal membrane sheets may be fixed to a metal plate (not shown) installed on the upper surface of the plywood layer 300 by welding. In this case, the metal membrane sheets constituting the primary sealing wall 400 may have edges overlapping and welded to form an airtightness.

According to the structure of the present invention in which the secondary sealing wall 200 of the composite material is positioned at the top level of the heat insulating wall 100 as described above, the secondary sealing wall 200 of the composite material is different from each other in the upper and lower heat insulating layers. Since it is not affected by the direction of heat shrinkage, the risk of leakage of the secondary sealing wall as in the conventional system can be eliminated.

Therefore, in the present invention, it is possible to apply a composite material that is very advantageous in terms of installation and economy than a sealing wall made of a metal material as the secondary sealing wall 200, so that the workability is remarkable in drying the insulation system of the liquefied gas storage tank. improvement and cost savings.

Figure 3 is a view schematically showing a more improved structure of the insulation system of the liquefied gas storage tank according to the present invention, Figure 4 is to explain the installation and connection method of the secondary sealing wall in the improved structure shown in Figure 3 is a drawing for

Hereinafter, the insulation system of the liquefied gas storage tank according to the present invention described with reference to FIGS. 3 and 4 is a secondary sealing wall installed on the top of the insulation wall 100 with respect to the embodiment described with reference to FIG. 2 above. (200) is to further present a specific connection structure.

3 and 4 , in the present invention, the secondary sealing wall 200 includes a flat secondary barrier 210 installed on the upper insulating panel 121 and the bridge panel 122, and downwardly. It may include a corrugated secondary barrier 220 connecting the upper surface of the upper insulating panel 121 and the bridge panel 122, including the protruding corrugation.

The plate-type secondary barrier 210 is provided as a sheet having a substantially rectangular cross section, and the corrugated secondary barrier 220 has both wing portions 221 . It may be provided in a structure including a wrinkle portion 222 protruding downward therebetween.

A chamfer (C) in the form of an oblique cut may be formed at the upper corners of the upper insulation panel 121 and the bridge panel 122, and the upper insulation panel 121 is formed by the chamfer portion C. ) and the bridge panel 122 may be formed with a groove (Groove, G) for accommodating the corrugated portion 222 of the corrugated secondary barrier 220 at the boundary portion.

Both the plate-type secondary barrier 210 and the corrugated secondary barrier 220 may be made of a composite material such as triplex as described above. That is, the plate-type secondary barrier 210 and the corrugated secondary barrier 220 may be made of the same material, and only the shape may be different.

The plate-type secondary barrier 210 may be attached to the upper surface of the upper insulating panel 121 and the bridge panel 122 except for the chamfer C.

In the corrugated secondary barrier 220, both wing portions 221 are seated on the upper surface of the edge of the flat secondary barrier 210 and fixed by bonding, and the corrugated portion 222 has the aforementioned groove ( It is accommodated in G) and may be disposed to be in contact with the chamfer portion C formed at the upper corners of the upper heat insulating panel 121 and the bridge panel 122 .

At this time, the shape of the wrinkle portion 222 may form a 'V' shape in cross section as shown in the drawings, but the present invention is not limited thereto. It can be implemented in various shapes that can absorb heat shrinkage caused by the In addition, when the shape of the corrugated portion 222 of the corrugated secondary barrier 220 is deformed as described above, the groove (G) formed between the upper heat insulating panel 121 and the bridge panel 122 corresponding to this is formed. The shape may also be deformed.

On the other hand, although only the cross section of the insulation system according to the present invention is shown in the drawing, a chamfer portion C is also formed in the corners of the upper insulation panel 121 and the bridge panel 122 in a direction not shown in the drawing. It goes without saying that a corrugated secondary barrier 220 may be installed in the region. For example, the chamfer portion C may be formed in all four corners of the upper heat insulating panel 121 and the bridge panel 122 , and at a location where the vertices of the upper heat insulating panel 121 and the bridge panel 122 meet each other The corrugated secondary barrier 220 may be provided in the form of a ten (十) to connect the upper surfaces of the four adjacent panels.

The plywood layer 300 installed on the secondary sealing wall 200 is, the first plywood layer 310 installed on the flat secondary barrier 210, and the corrugated secondary barrier 220 on It may include a second plywood layer 320 to be installed.

The first plywood layer 310 is disposed in an area excluding the portion to which the corrugated secondary barrier 220 is attached on the flat secondary barrier 210, and the second plywood layer 320 is a corrugated secondary barrier. It may be disposed on the barrier 220 . Accordingly, the second plywood layer 320 may have a thickness reduced by the thickness of the corrugated secondary barrier 220 than the first plywood layer 310 .

According to the improved structure of the present invention, flexible behavior of the secondary sealing wall 200 is possible by the corrugated secondary barrier 220 even during thermal contraction due to the cryogenic temperature of the liquefied gas, so that the secondary sealing wall 200 The risk of leakage from the side can be more reliably eliminated. Therefore, it is possible to construct a structurally stable thermal insulation system for a liquefied gas storage tank while applying a composite material as a secondary sealing wall.

The present invention is not limited to the described embodiments, and it is apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Accordingly, it should be said that such modifications or variations are included in the claims of the present invention.

100: insulation wall
110: lower insulating layer
111: lower insulation panel
120: upper insulating layer
121: upper insulation panel
122: bridge panel
200: secondary sealing wall
210: plate type secondary sealing wall
220: corrugated secondary sealing wall
300: plywood layer
310: first plywood layer
320: second plywood layer
400: primary sealing wall

Claims (6)

A plurality of lower heat insulating panels, an upper heat insulating panel disposed within the upper area of the lower heat insulating panel, and a bridge panel disposed in a gap between the adjacent upper heat insulating panels to cover the gap between the adjacent lower heat insulating panels a thermal insulation wall comprising a plurality of layers;
a secondary sealing wall made of a composite material installed on the insulating wall;
a plywood layer installed on the second sealing wall; and
Including a primary sealing wall installed on the upper portion of the plywood layer,
The secondary sealing wall,
a flat secondary barrier made of a flat sheet and attached to the upper surface of the upper insulating panel and the bridge panel; and
Both side wings are attached to the upper surface of the edge of the flat secondary barrier, and a corrugated secondary barrier including a wrinkled portion protruding downward between the both side wings,
The wrinkle portion is characterized in that it is accommodated in a groove formed in the boundary portion between the upper insulating panel and the bridge panel,
Insulation system for liquefied gas storage tank. The method according to claim 1,
A chamfer portion for preventing interference with the wrinkle portion is formed at upper corners of the upper insulation panel and the bridge panel, and the groove is formed by a space in which the upper insulation panel and the chamfer portion formed on the bridge panel face each other. characterized in that
Insulation system for liquefied gas storage tanks. 3. The method according to claim 2,
The flat secondary barrier is fixed to the upper surface of the upper insulating panel and the bridge panel except for the chamfer by adhesive,
It characterized in that the wing portions on both sides of the corrugated secondary barrier are fixed by adhesion to the upper surface of the edge of the flat secondary barrier,
Insulation system for liquefied gas storage tanks. 4. The method according to claim 3,
The secondary sealing wall is characterized in that it is composed of a triplex material consisting of a combination of aluminum foil and glass fiber,
Insulation system for liquefied gas storage tanks. 5. The method according to claim 4,
The plywood layer,
a first plywood layer installed on the flat-type secondary barrier and disposed on the flat-type secondary barrier in an area excluding the portion to which the corrugated secondary barrier is attached; and
Characterized in that it comprises a second plywood layer installed on the corrugated secondary barrier,
Insulation system for liquefied gas storage tanks. 6. The method of claim 5,
The primary sealing wall is characterized in that it is composed of any one material of low-temperature steel including stainless steel, Invar steel, and aluminum alloy.
Insulation system for liquefied gas storage tanks.

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