KR20210126295A - Liquified gas storage tank and method for forming the insulation sturucture thereof - Google Patents

Abstract

The present invention relates to a liquefied gas storage tank for storing liquefied gas, comprising: a tank body in which liquefied gas is stored; a heat insulation part formed by laminating and injecting a heat insulating material on the outer surface of the tank body in a spraying manner; and a flow path forming part for forming a leakage path for the movement of the leaked liquefied gas between the tank body and the heat insulation part, wherein the flow path forming part is installed in a region where stress is concentrated during thermal deformation of the tank body, thereby capable of preventing breakage of the heat insulation part.

Description

A liquefied gas storage tank and a method for forming an insulation structure of the liquefied gas storage tank

The present invention relates to a liquefied gas storage tank for storing liquefied gas, and more particularly, a liquefied gas storage tank in which a thermal insulation part is formed by laminating and spraying a thermal insulation material on an outer wall of the tank by a spray method, and the formation of a thermal insulation structure of the liquefied gas storage tank it's about how

Natural gas is transported as gas through land or sea gas pipelines, or stored in liquefied gas carriers in a liquefied state and transported to remote consumers.

For example, liquefied gas such as LNG (Liquefied Natural Gas) or LPG (Liquefied Petroleum Gas) is obtained by cooling natural gas or petroleum gas to a cryogenic temperature (approximately -163°C in the case of LNG), and its volume is larger than that in gaseous state. It is greatly reduced, so it is very suitable for storage and transportation.

Liquefied gas carriers, such as LNG carriers, are for loading and unloading liquefied gas to destinations on land by navigating the sea, and for this purpose, storage tanks (often called 'cargo holds') that can withstand the cryogenic temperature of liquefied gas ) is included.

As an example of an offshore structure provided with a storage tank capable of storing liquefied gas in a cryogenic state as described above, in addition to a liquefied gas carrier, a ship such as an LNG RV (Regasification Vessel), an LNG FSRU (Floating Storage and Regasification Unit), an LNG FPSO (Floating, Production, Storage and Off-loading), BMPP (Barge Mounted Power Plant), FSPP (Floating and Storage Power Plant), such as plants.

An LNG RV is an LNG regasification facility installed on a liquefied gas carrier that can sail and float on its own. The LNG FSRU is a structure that stores liquefied gas unloaded from an LNG carrier in a storage tank at sea far from the land, vaporizes the liquefied gas as needed, and supplies it to onshore consumers. It is a structure used to directly liquefy and store in a storage tank and, if necessary, transport the LNG stored in the storage tank to an LNG carrier. BMPP is a structure used to produce electricity at sea by mounting power generation facilities on barges, and FSPP is an offshore plant that produces electricity by mounting power generation facilities and storage tanks on structures floating on the sea.

As such, in marine structures such as LNG carriers, LNG RVs, LNG FPSOs, LNG FSRUs, BMPPs, and FSPPs that transport or store liquid cargo such as LNG at sea, storage tanks for storing liquid cargo LNG in a cryogenic state is installed

These liquefied gas storage tanks can be classified into independent type and membrane type depending on whether the load of cargo acts directly on the insulation material. It is divided into Type III, and the independent storage tank is divided into Type A, Type B, and Type C according to IMO regulations.

In general, independent storage tanks are combined with a tank body made of an alloy resistant to low temperatures, such as aluminum alloy, SUS, or 9% nickel, and the outside of the tank body to have a thermal insulation structure to secure thermal insulation performance.

Conventionally, in order to form such a heat insulating structure, a heat insulating layer is formed to have a predetermined thickness designed by attaching a plurality of heat insulating panels to the outer wall of the tank or spraying a heat insulating material on the outer surface of the tank body in a spray manner.

However, the method of attaching a plurality of insulation panels to the outer wall of the tank requires a panel fixing means for fixing each insulation panel and a sealing means for sealing between the insulation panels. Significant effort, time, and cost are consumed to form a thermal insulation layer on the

On the other hand, when the thermal insulation layer is formed by laminating and spraying spray foam insulation on the outer wall of the tank, since the insulation layer is directly attached to the outer wall of the tank, the difference in thermal expansion coefficient between the outer wall of the tank and the spray foam insulation causes stress to occur between the outer wall of the tank and the insulation layer. When the heat shrinkage of the outer wall of the tank, this stress is applied to the heat insulating layer, which may cause cracks in the heat insulating layer or damage the heat insulating layer.

In addition, when a spray-type spray insulation is used to form a thermal insulation layer in the thermal insulation structure of a liquefied gas storage tank according to the prior art, the outer wall of the tank and the thermal insulation layer are completely bonded to prevent leakage of liquefied gas There is a difficulty in forming a leakage path for this purpose.

On the other hand, a drip tray for accommodating the leaked liquefied gas is installed in the lower part of the liquefied gas storage tank. In the prior art, the leaked liquefied gas is accommodated in the drip tray by gravity and is naturally vaporized.

Conventionally, a gas detection sensor is mounted on the drip tray to check whether leakage of liquefied gas occurs, but it takes a considerable amount of time for the leaked liquefied gas to move to the drip tray by gravity, and when the amount of leakage of liquefied gas is small Leakage of liquefied gas may not be detected.

In addition, the leakage passage formed between the outer wall of the tank and the heat insulating layer has a plurality of intersection portions on the outer wall of the tank, and the leakage liquefied gas remains in these intersection portions, so that smooth natural vaporization is not achieved, and leakage on the leakage passage When the liquefied gas is vaporized, overpressure is generated due to the increase in the volume of the liquefied gas, which may damage the outer wall of the tank and the insulation.

Republic of Korea Patent Publication No. 10-2008-0097519 Republic of Korea Patent Publication No. 10-1034472

The present invention is a liquefied gas storage tank in which a heat insulating material is laminated and sprayed on the outer surface of the tank body in a spray manner to form a heat insulating part, and a leak path for the movement of leaked liquefied gas can be formed between the tank body and the heat insulating part. And to provide a method for forming a thermal insulation structure of the liquefied gas storage tank.

In addition, the present invention relieves the stress applied to the insulating part due to the difference in the thermal expansion coefficient between the tank body and the insulating part in a cryogenic environment, thereby preventing cracks or damage to the insulating part during thermal deformation of the tank body. It is another object to provide a liquefied gas storage tank and a method for forming a thermal insulation structure of the liquefied gas storage tank.

According to an aspect of the present invention, there is provided a liquefied gas storage tank for storing liquefied gas, comprising: a tank body in which liquefied gas is stored; an insulating part formed by laminating and spraying a thermal insulator on the outer surface of the tank body; And a liquefied gas storage tank including a flow path forming part for forming a leak path (Leakage path) for the movement of the leaking liquefied gas between the tank body and the heat insulating part may be provided.

The flow path forming part may be installed in a region where stress is concentrated during thermal deformation of the tank body.

In addition, a plurality of internal reinforcement is welded to the inner surface of the tank body, and the flow path forming part may be installed on the outer surface of the tank body to which the internal reinforcement is welded.

In addition, the flow path forming part may include glass wool.

In addition, the flow path forming part may further include a glass cloth attached to the outer surface of the glass wool.

In addition, the flow path forming part may further include a shape maintaining member installed on a boundary surface of the glass wool and the heat insulating part to maintain the shape of the glass wool.

In addition, the shape maintaining member may be any one of plywood (Plywood) and reinforced polyurethane foam (RPUF).

In addition, it may further include a protective layer (Protection layer) applied on the heat insulating portion to protect the heat insulating portion.

According to another aspect of the present invention, there is provided a method for forming an insulating structure of a liquefied gas storage tank for insulating the liquefied gas stored inside the tank body, the step of installing a flow path forming part for movement of the leaked liquefied gas on the outer surface of the tank body ; and forming a thermal insulation part by spraying and spraying a thermal insulation material on the outer surface of the tank body, wherein the flow path forming part is installed in a region where stress is concentrated during thermal deformation of the tank body. A forming method may be provided.

The present invention forms an insulating part by laminating and spraying an insulating material on the outer surface of the tank body in a spraying manner, but by installing a flow path forming part between the tank body and the insulating part, a leakage passage ( Leakage path).

In addition, the flow path forming part is installed in a region where stress is concentrated during thermal deformation of the tank body to relieve stress applied to the insulating part due to the difference in thermal expansion coefficient between the tank body and the insulating part, thereby cracking the insulating part due to thermal contraction of the tank body. It is possible to prevent this from occurring or the insulating part being damaged.

1 is a view schematically showing a partial cross-section of a liquefied gas storage tank according to an embodiment of the present invention.
FIG. 2 is an enlarged view of the flow path forming part of FIG. 1 .
3 is a view for explaining the behavior due to thermal contraction of the tank body shown in FIG.
4 is a view showing a liquefied gas leakage treatment system of a liquefied gas storage tank according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, preferred embodiments of the present invention will be described below, but the technical spirit of the present invention is not limited thereto and may be variously implemented by those skilled in the art without being limited thereto.

In one embodiment of the present invention to be described later, the liquefied gas includes LNG (Liquified Natural Gas) at a cryogenic temperature (about -163° C.), LPG (Liquefied Petroleum Gas), Liquefied Ethylene Gas, etc. It may include all gas fuel stored in a liquefied state, and liquefied gas may mean including not only liquid liquefied gas but also vaporized liquefied gas.

1 is a view schematically showing a partial cross-section of a liquefied gas storage tank according to an embodiment of the present invention, FIG. 2 is an enlarged view of the flow path forming part of FIG. 1, and FIG. 3 is shown in FIG. It is a diagram for explaining the behavior due to thermal contraction of the tank body.

Referring to FIG. 1 , another liquefied gas storage tank according to an embodiment of the present invention has a tank body 100 in which liquefied gas is stored therein, and a thermal insulator layered on the outer surface of the tank body 100 in a spray manner. It includes a heat insulating part 120 formed by spraying.

The liquefied gas storage tank of this embodiment is a liquefied gas storage tank that forms the insulating part 120 by spraying an insulating material on the outside of the tank body 100 in a spraying manner. It may be an independent type (Independent Type) liquefied gas storage tank manufactured, and preferably, it may be applied to an independent liquefied gas storage tank of SPB (Self-supporting prismatic-shape IMO Type B) type.

The tank body 100 may have a polyhedral shape having front and rear, left and right side surfaces, and upper and lower surfaces.

The tank body 100 may be made of an alloy strong at low temperatures, such as aluminum alloy, SUS, or 9% nickel, and is preferably made of high manganese steel (High Mn steel) material to withstand cryogenic temperatures and secure sufficient rigidity. can be

In addition, a plurality of internal reinforcement 101 for structural rigidity of the liquefied gas storage tank may be formed on the inner surface of the tank body 100 .

The internal reinforcement 101 may be made of the same material as the tank body 100 and be welded to the inner surface of the tank body 100 .

The internal reinforcement 101 of this embodiment is a horizontal girder installed to be spaced apart from the inner surface of the tank body 100 at a predetermined distance in the bow and stern directions, and is installed long in the bow and stern directions and spaced apart in the left and right directions. It may include a longitudinal member (longie) that is.

The heat insulating part 120 is formed by stacking and spraying the heat insulating material from the outside of the tank body 100 a plurality of times in a spraying manner. may include.

The heat insulating part 120 may have a different thickness depending on the size and type of the tank body 100, but it is known that the heat insulating part 120 is formed to satisfy the thermal insulation performance required in the liquefied gas storage tank. It may be desirable to have a thickness that can ensure sufficient thermal insulation performance in consideration of the density of the thermal insulation material laminated and sprayed on the outer surface of the body 100 .

On the other hand, between the tank body 100 and the insulating part 120, a leak path (Leak path) to prepare for leakage of the liquefied gas should be formed.

In this embodiment, before forming the heat insulating part 120 on the outside of the tank body 100 in order to form a leakage passage for the movement of the leaking liquefied gas between the tank body 100 and the heat insulating part 120, the tank body ( The flow path forming part 110 is installed on the outer surface of 100).

The flow path forming unit 110 includes glass wool 111, and the glass wool 111 is attached to the outer surface of the tank body 100 and can be used as a leakage passage for the movement of the leaking liquefied gas. .

In the present embodiment, there is no restriction on the height of the glass wool 111 , and the height of the glass wool 111 may be equal to or smaller than the height of the heat insulating part 120 formed around the glass wool 111 .

Here, the height is expressed with reference to FIG. 1 , and may mean the thickness of each of the glass wool 111 and the heat insulating part 120 formed on the outside of the tank body 100 .

In addition, the flow path forming unit 110 may further include a glass cloth 113 attached to the outer surface of the glass wool 111 to maintain the shape of the glass wool 111 .

As an example, as shown in (a) of FIG. 2 , the glass cloth 113 may be applied to three surfaces except for one surface of the glass wool 111 attached to the outer surface of the tank body 100 .

In addition, when the weight of the heat insulating part 120 formed to include the flow path forming part 110 is large, as shown in FIG. 2B , the interface between the glass wool 111 and the heat insulating part 120 . A shape maintaining member 115 forming an external skeleton of the glass wool 111 may be installed therein.

The shape maintaining member 115 of this embodiment may preferably be any one of plywood and reinforced polyurethane foam (RPUF).

The flow path forming unit 110 of this embodiment may be preferably installed in a portion where stress is concentrated in the tank body 100 when the tank body 100 is thermally deformed due to the liquefied gas stored therein.

When LNG is stored inside the tank body 100, the temperature of the LNG is about -163°C and is very low compared to LPG having a temperature of about -40°C. It is necessary to relieve the stress applied to the heat insulating part 120 due to the difference in the coefficient of thermal expansion of 120 .

In particular, in the portion of the tank body 100 , where the internal reinforcement 101 is installed, stress may be concentrated during thermal deformation of the tank body 100 , and the internal reinforcement 101 is welded to the portion of the tank body 100 . When the heat insulating part 120 is formed on the back surface, such stress is applied to the heat insulating part 120 during thermal contraction of the tank body 100 , and there is a high risk that the insulating part 120 may be cracked or the insulating part 120 may be damaged. .

In this embodiment, the flow path forming part 110 is installed on the back surface of the part where the internal reinforcement 101 is welded in the tank body 100, that is, on the outer surface part of the tank body 100 where the internal reinforcement 101 is installed, and the tank The heat insulating part 120 may be formed by laminating and spraying a heat insulating material on the outer surface of the tank body 100 to include the flow path forming part 110 from the outside of the body 100 .

In other words, as shown in FIG. 3, even if the tank body 100 is thermally contracted or expanded, the glass wool 111 behaves like the tank body 100, and the thermal deformation of the tank body 100 causes the heat insulating part ( 120) can relieve the stress applied to it.

The liquefied gas storage tank of this embodiment may further include a protection layer applied on the heat insulating part 120 to protect the heat insulating part 120 formed on the outer surface of the tank body 100 .

In the liquefied gas storage tank according to an embodiment of the present invention, the heat insulating material 120 is laminated and sprayed on the outer surface of the tank body 100 in a spray manner to form a heat insulating part, but a flow path between the tank body 100 and the heat insulating part 120 . The forming unit 110 is installed, and the flow path forming unit 110 may be utilized as a leakage path for the movement of the leaking liquefied gas when the liquefied gas is leaked.

In addition, the flow path forming part 120 is installed in a region where stress is concentrated during thermal deformation of the tank body 100 and is applied to the heat insulating part 120 due to the difference in the coefficient of thermal expansion between the tank body 100 and the heat insulating part 120 . By relieving the stress, it is possible to prevent the thermal insulation unit 120 from being cracked or from being damaged during thermal contraction or thermal expansion of the tank body 100 .

In addition to liquefied gas carriers, such liquefied gas storage tanks are ships such as LNG RV (Regasification Vessel), LNG FSRU (Floating Storage and Regasification Unit), LNG FPSO (Floating, Production, Storage and Off-loading), BMPP (Barge Mounted Power). Plant), it can be applied to plants such as FSPP (Floating and Storage Power Plant).

4 is a view showing a liquefied gas leakage treatment system of a liquefied gas storage tank according to an embodiment of the present invention.

On the other hand, the lower portion of the tank body 100, as shown in Figure 4, a drip tray (Drip tray) 140 for accommodating the leaked liquefied gas may be installed.

In the prior art, the leaked liquefied gas was accommodated in the drip tray by gravity and evaporated naturally, and a gas detection sensor was mounted on the drip tray to check whether leakage of the liquefied gas occurred.

However, this natural vaporization method of liquefied gas leakage treatment takes a considerable amount of time for the leaked liquefied gas to be moved to the drip tray by gravity due to the high density of the leaked liquefied gas, and when the amount of leakage of the liquefied gas is small, Leaks of liquefied gas may not be detected.

In addition, the leakage passage formed between the outer wall of the tank and the heat insulating layer has a plurality of intersection portions on the outer wall of the tank, and leaking liquefied gas remains in these intersection portions, so that smooth natural vaporization may not be achieved.

In addition, when the leaked liquefied gas is vaporized on the leaking passage, overpressure is generated due to an increase in the volume of the liquefied gas, which may damage the outer wall of the tank and the insulating material.

Referring to FIG. 4 , the liquefied gas leakage treatment system of the liquefied gas storage tank according to an embodiment of the present invention communicates with the flow path forming unit 110 to release the leaked liquefied gas from the drip tray provided in the lower part of the tank body 100 . A liquefied gas discharge line 150 guiding to 140, one side is connected to the liquefied gas discharge line 150 and the other side is connected to a vent mast 170 formed on the upper part of the tank body 100 It includes a vent line 180 .

The flow path forming unit 110 may be used as a leakage passage for the movement of the leaking liquefied gas between the tank body 100 and the heat insulating unit 120 (see FIG. 1 ).

The liquefied gas discharge line 150 has one side connected to the flow path forming unit 110 at the bottom of the tank body 100 and the other side is in communication with the drip tray 140, so that when the liquefied gas leaks, the leaked liquefied gas is discharged from the drip tray (140) may serve as a guide.

The drip tray 140 communicates with the liquefied gas discharge line 150 to temporarily store the leaked liquefied gas, and one or more may be installed under the tank body 100 .

The liquefied gas leakage treatment system of the liquefied gas storage tank according to an embodiment of the present invention is installed on the liquefied gas discharge line 150 to separate the liquefied gas in a liquid state and the vaporized liquefied gas in a gas-liquid separator (Seperator) 160 ) may be further included.

In addition, a leak detection means for detecting leakage of liquefied gas may be installed on the liquefied gas discharge line 150. The leak detection means of this embodiment is provided in the gas-liquid separator 160 and a gas detector ( Gas detector) (not shown).

The vent line 180 is connected to the vent mast 170 formed on the upper portion of the tank body 100 , and the vaporized liquefied gas may be discharged to the outside of the hull through the vent mast 170 .

A forced transfer means 181 for forcibly transferring the leaked liquefied gas when the leaked liquefied gas occurs may be installed on the vent line 180 .

The forced transport means 181 of this embodiment may include a fan or a compressor.

The liquefied gas leakage treatment system of the liquefied gas storage tank according to an embodiment of the present invention includes a leak detection means installed on the liquefied gas discharge line 150 and a forced transfer means 181 installed on the vent line 180 . By forcibly transporting the leaking liquefied gas to the outside through the , it is possible to prevent overpressure from being applied to the tank body 100 and the insulating part 120 due to vaporization of the leaking liquefied gas remaining in the leaking passage.

Meanwhile, the liquefied gas leakage treatment system of the present embodiment may further include an inert gas supply line 190 branching from the vent line 180 to supply an inert gas to the flow path forming unit 110 .

In this embodiment, a circulation structure may be formed by connecting the flow path forming unit 110 , the liquefied gas discharge line 150 , the vent line 180 , and the inert gas supply line 190 .

In this embodiment, the forced transport means 181 is installed between the point where the vent line 180 is connected to the liquefied gas discharge line 150 and the point where the inert gas supply line 190 is branched from the vent line 181 . Thus, the forced transport means 181 can serve to not only forcibly transport the leaked liquefied gas, but also supply the inert gas to the flow path forming unit 110 .

That is, the inert gas supply line 190 of this embodiment may receive an inert gas from a separate inert gas supply unit (not shown), and circulate the supplied inert gas to the flow path forming unit 110 .

The inert gas supply unit of this embodiment may be a nitrogen generator for generating nitrogen (N2) used as an inert gas or a nitrogen storage tank in which nitrogen is stored.

Referring to FIG. 4 , it is shown that the inert gas is circulated sequentially through the inert gas supply line 190 , the flow path forming unit 110 , the vent line 180 , and the liquefied gas discharge line 150 , but this The invention is not limited thereto, and the circulation direction of the inert gas may be changed in consideration of the density of the liquefied gas.

In the liquefied gas leakage treatment system of this embodiment, the inert gas is circulated in the flow path forming unit 110 , and the leaked liquefied gas in the flow path forming unit 110 is discharged to the outside together with the inert gas, thereby forming the flow path forming unit 100 . It is possible to prevent in advance that an overpressure is generated in the flow path forming unit 110 due to vaporization of the leaking liquefied gas remaining at the intersection, and the leakage of the liquefied gas can be quickly detected through the leak detection means. .

In addition, through continuous forced circulation of inert gas, even a small amount of leakage can be detected quickly.

That is, the liquefied gas leakage treatment system of the liquefied gas storage tank according to an embodiment of the present invention can not only detect the leakage of the liquefied gas quickly, but also forcibly transport the leaked liquefied gas to the outside. It is possible to prevent overpressure from being applied to the tank body 100 and the heat insulating part 120 due to the vaporization of the leaked liquefied gas.

In addition, when the leakage of liquefied gas does not occur, the inert gas is circulated through the inert gas supply line 190 to the flow path forming unit 110 to improve the insulation performance of the liquefied gas storage tank. can

Hereinafter, a liquefied gas leakage treatment method of a liquefied gas storage tank using the liquefied gas leakage treatment system having the above configuration will be briefly described.

The liquefied gas leakage treatment method of the liquefied gas storage tank according to an embodiment of the present invention is a liquefied gas leakage treatment method of a liquefied gas storage tank in which an insulating part is formed by spraying an insulating material from the outside of the tank body 100 in a spray manner. , detecting leakage of liquefied gas using a leak detection means installed on the liquefied gas discharge line 150 communicating with the flow path forming unit 110 , and a vent line 180 connected to the liquefied gas discharge line 150 . ) may include the step of discharging the leaked liquefied gas to the outside of the hull using the forced transport means 181 installed on the hull.

The step of discharging the leaking liquefied gas to the outside of the hull may include separating the liquefied gas in a liquid state and the vaporized liquefied gas through the gas-liquid separator 160 installed on the liquefied gas discharge line 150 .

Liquid gas through the gas-liquid separator 160 may be accommodated in the drip tray 140 provided at the lower portion of the tank body 100 , and the vaporized liquefied gas is vented through the vent line 180 and the tank body 100 . It may be discharged to the outside of the hull through the vent mast 170 formed on the upper part of the hull.

On the other hand, when the leakage of the liquefied gas is not detected in the step of detecting the leakage of the liquefied gas, the inert gas is circulated to the flow path forming unit 110 through the inert gas supply line 190 branched from the vent line 180 . can do it

The above description is merely illustrative of the technical idea of the present invention, and various modifications, changes, and substitutions are possible within the range that does not depart from the essential characteristics of the present invention by those of ordinary skill in the art to which the present invention pertains. will be. Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are for explaining, not limiting, the technical spirit of the present invention, and the scope of the technical spirit of the present invention is not limited by these embodiments and the accompanying drawings. . The protection scope of the present invention should be construed by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

100: tank body
101: internal reinforcement
110: flow path forming part
111: Glass wool
113: Glass clothe
115: shape maintaining member
120: insulation
130: protection layer (protection layer)
140: drip tray (Drip tray)
150: liquefied gas discharge line
160: gas-liquid separator (Seperator)
170: vent mast (Vent mast)
180: bent line
181: means of forced transport
190: Inert gas supply line

Claims (8)

As a liquefied gas storage tank for storing liquefied gas,
a tank body in which liquefied gas is stored;
an insulating part formed by laminating and spraying a thermal insulator on the outer surface of the tank body; and
A flow path forming part for forming a leak path for the movement of the leaking liquefied gas between the tank body and the heat insulating part,
The flow path forming part is a liquefied gas storage tank that is installed in a region where stress is concentrated during thermal deformation of the tank body. The method of claim 1,
A plurality of internal reinforcement is installed on the inner surface of the tank body,
The flow path forming part is a liquefied gas storage tank that is installed on the outer surface of the tank body to which the internal reinforcement is welded. The method of claim 1,
The flow path forming part is a liquefied gas storage tank comprising a glass wool (Glass wool). 4. The method of claim 3,
The liquefied gas storage tank further comprising a glass cloth attached to the outer surface of the glass wool in the flow path forming part. 4. The method of claim 3,
The liquefied gas storage tank further comprising a shape maintaining member installed at an interface between the glass wool and the heat insulating part in order to maintain the shape of the glass wool in the flow path forming part. 6. The method of claim 5,
The shape maintaining member is a liquefied gas storage tank of any one of plywood (Plywood) and reinforced polyurethane foam (RPUF). The method of claim 1,
The liquefied gas storage tank further comprising a protective layer (Protection layer) applied on the heat insulator to protect the heat insulator. A method of forming an insulating structure of a liquefied gas storage tank for insulating the liquefied gas stored inside the tank body, the method comprising:
Installing a flow path forming part for the movement of the leaked liquefied gas on the outer surface of the tank body; and
Comprising the step of forming a heat insulating part by spraying laminated and spraying a heat insulating material on the outer surface of the tank body,
The flow path forming part is a method of forming a thermal insulation structure of a liquefied gas storage tank that is installed in a region where stress is concentrated during thermal deformation of the tank body.

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