KR102662431B1 - Liquefied Natural Gas Storage Tank - Google Patents

Abstract

A liquefied natural gas storage tank is launched. The present invention relates to a liquefied natural gas storage tank in which PTBS is installed to support a pump tower, comprising an insulation wall made of a plurality of insulation panels arranged on the inner wall of the hull, and PTBS among the plurality of insulation panels. The insulation panel installed in the peripheral area includes a pair of peripheral insulation panels including a semicircular inner peripheral surface to correspond to the outer peripheral surface of PTBS, and the pair of peripheral insulation panels each have semicircular inner peripheral surfaces facing each other. It is characterized in that it is arranged to surround the PTBS.

Description

Liquefied Natural Gas Storage Tank {Liquefied Natural Gas Storage Tank}

The present invention relates to a liquefied natural gas storage tank, and more specifically, to the arrangement structure of the insulation panel around the Pump Tower Base Support (PTBS), which is installed to support the pump tower within the storage tank. It relates to a liquefied natural gas storage tank containing.

Natural gas is transported in gas form through onshore or offshore gas pipelines, or stored in LNG carriers as liquefied natural gas (Liquefied Natural Gas (LNG)) and transported to distant consumers. LNG is obtained by cooling natural gas to extremely low temperatures (approximately -163°C), and its volume is reduced to approximately 1/600 compared to gaseous natural gas, making it very suitable for long-distance transportation by sea.

Structures for transporting or storing LNG, such as LNG carriers that carry LNG on the sea and unload LNG at land-based destinations, are equipped with storage tanks (commonly referred to as 'cargo holds') that can withstand the extremely low temperatures of LNG.

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

The NO 96 type storage tank has primary and secondary sealing walls made of an Invar (36% nickel steel) membrane with a thickness of 0.5 to 0.7 mm, and insulation materials such as perlite powder in a plywood box. It includes primary and secondary insulation walls provided in the form of a filled insulation box.

The NO 96 type storage tank has almost the same level of liquid tightness and strength as the primary sealing wall and the secondary sealing wall, so when the primary sealing wall leaks, the cargo can be safely supported with only the secondary sealing wall for a considerable period of time.

In addition, the NO 96 type storage tank has an insulation wall filled with insulation inside a wooden box, so it can have higher compressive strength and rigidity compared to the MARK Ⅲ type storage tank, and the automation rate is high due to easy welding.

The MARK Ⅲ type storage tank has a primary sealing wall made of a 1.2mm thick stainless steel (SUS) membrane, a secondary sealing wall made of triplex, and a top or bottom surface of polyurethane foam. It includes primary and secondary insulation walls made of insulation panels glued together with wood plywood.

The primary sealing wall of the MARK III type storage tank has wave-shaped wrinkles to absorb heat contraction caused by LNG in a cryogenic state, and these wave-shaped wrinkles absorb membrane deformation, so no significant stress is generated within the membrane.

The MARK Ⅲ type storage tank has a disadvantage in terms of installation/manufacturing due to the low welding automation rate of the primary sealing wall with corrugations, but compared to the Invar membrane, the stainless steel membrane and triplex are cheaper and easier to construct, and polyurethane Foam has an excellent insulation effect and is widely used.

As described above, the membrane-type liquefied natural gas storage tank is formed by sequentially stacking a secondary insulation wall, a secondary sealing wall, a primary insulation wall, and a primary sealing wall from the inner wall of the hull toward the inner space where LNG is accommodated. It has a structure that includes thermally insulating barriers.

Additionally, it is known that the insulating wall of a storage tank is formed by repeatedly arranging components such as insulating boxes or insulating panels.

However, liquefied natural gas storage tanks include special areas such as liquid dome, gas dome, and Pump Tower Base Support (PTBS), etc. Because of this, there are areas where the composition of the insulation barrier must be changed.

The technical task of the present invention is to provide an insulation panel connection structure that can reduce the burden of the membrane laminated on the top of the insulation panel disposed in the periphery of the above-mentioned special area.

In addition, another technical problem to be achieved by the present invention is to arrange the insulation panels forming the primary insulation wall and the secondary insulation wall so that they are offset from each other so that the panel behavior in response to the load occurring within the storage tank is stable. In consideration of this cross-placement, a liquefied natural gas storage tank is provided in which insulation panels are placed around the special area.

In order to achieve the above object, the present invention is a liquefied natural gas storage tank in which PTBS is installed to support a pump tower, and includes an insulation wall made of a plurality of insulation panels arranged on the inner wall of the hull. And, among the plurality of insulation panels, the insulation panel installed on the periphery of the PTBS includes a pair of peripheral insulation panels including a semicircular inner peripheral surface to correspond to the outer peripheral surface of the PTBS, and the pair of peripheral insulation panels provides a liquefied natural gas storage tank, characterized in that the semicircular inner peripheral surfaces provided in each are arranged to face each other and are arranged to surround the PTBS.

One end of the pair of peripheral insulation panels facing each other may be connected by a bridge plate.

The peripheral insulation panel includes an insulation material made of polyurethane foam and an upper plywood attached to the top of the insulation material, and one end of the peripheral insulation panel where a semicircular inner peripheral surface is formed has a portion of the upper surface of the insulation material exposed. It can be prepared in a state.

The bridge plate may be arranged to span the exposed upper surface of the insulation material provided on each of the pair of peripheral insulation panels facing each other.

The bridge plate is made of plywood and can be attached to the exposed upper surface of the insulation material with an adhesive.

In addition, in order to achieve the above object, the present invention provides a liquefied natural gas storage tank including an insulation wall made of a plurality of insulation panels arranged on the inner wall of the hull, and a pair of peripheral insulation panels including a semicircular inner peripheral surface. It is provided with, and by arranging the inner peripheral surfaces of the pair of peripheral insulation panels to face each other, a circular space is formed between the pair of peripheral insulation panels to accommodate a structure installed to protrude to the inside of the storage tank. A liquefied natural gas storage tank is provided.

One end of the pair of peripheral insulation panels facing each other is connected by a bridge plate, and the bridge plate is flush with the upper surface of the peripheral insulation panel, and the lower part of the sealing wall laminated on the upper part of the peripheral insulation panel can support.

One end of the peripheral insulation panel may include a stepped upper surface for placement of the bridge plate.

In the liquefied natural gas storage tank according to the present invention, when installing an insulation panel on the periphery of PTBS installed in the storage tank, the peripheral insulation panels are connected by a bridge plate to reduce the burden acting on the membrane laminated on the top. It has the effect of reducing.

In addition, in the liquefied natural gas storage tank according to the present invention, the alternating arrangement between the upper and lower insulation panels of the double insulation wall can be formed throughout the storage tank including the special area, thereby reducing the amount of heat generated within the storage tank. The behavior of the panel against load can be achieved stably.

Figure 1 is a diagram schematically showing the insulation structure of a liquefied natural gas storage tank according to the present invention.
Figure 2 is a diagram showing the secondary insulation panel of the present invention.
Figure 3 is a diagram showing the primary insulation panel of the present invention.
Figures 4a and 4b are diagrams sequentially showing the process of installing a secondary peripheral insulation panel around the PTBS in a liquefied natural gas storage tank according to the present invention.
Figure 5 is a diagram showing the structural analysis of the secondary peripheral insulation panel installed according to Figure 4.
Figure 6 is a diagram schematically showing the secondary insulation wall formed in the liquefied natural gas storage tank according to the present invention containing PTBS.
Figure 7 is a diagram showing that the primary peripheral insulation panel is installed around the PTBS in the liquefied natural gas storage tank according to the present invention.
Figure 8 is a diagram schematically showing the primary insulation wall and secondary insulation wall formed in the liquefied natural gas storage tank according to the present invention containing PTBS.

In order to fully understand the present invention, its operational advantages, and the objectives achieved by practicing 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.

Hereinafter, the present invention will be described in detail by explaining preferred embodiments of the present invention with reference to the attached drawings. The same reference numerals in each drawing indicate the same member.

In the present invention, the use of the terms 'primary' and 'secondary' refers to whether the function of primarily sealing or insulating LNG, or secondary sealing or insulating, is based on the LNG stored in the storage tank. It was used as a standard for classification.

Additionally, by convention, the terms 'top' or 'above' applied to elements of a tank refer to a direction towards the inside of the tank, regardless of the direction with respect to gravity, and likewise, the terms 'bottom' or 'below' refer to a direction towards the inside of the tank, regardless of the direction with respect to gravity. Regardless of the direction, it points towards the outside of the tank.

Figure 1 is a diagram schematically showing the insulation structure of a liquefied natural gas storage tank according to the present invention, Figure 2 is a diagram showing the secondary insulation panel of the present invention, and Figure 3 is a diagram showing the primary insulation panel of the present invention. am.

Referring to Figure 1, the liquefied natural gas storage tank according to the present invention includes a secondary insulation wall 100 consisting of a plurality of secondary insulation panels 110 arranged on the inner wall of the hull (H), and a secondary insulation A secondary sealing wall 200 installed on the wall 100, a primary insulation wall 300 consisting of a plurality of primary insulation panels 310 arranged on the secondary sealing wall 200, and a primary insulation wall 300 It can be seen that the structure includes a primary sealing wall 400 installed on the insulating wall 300.

The secondary insulation panel 110 forming the secondary insulation wall 100 is manufactured as a unit panel in the shape of a hexahedron, and a plurality of secondary insulation panels 110 are arranged in the horizontal and longitudinal directions on the inner wall of the hull (H). By doing this, the secondary insulation wall 100 can be formed.

The primary insulation panel 310 forming the primary insulation wall 300 is similarly manufactured as a unit panel in the form of a hexahedron, and a plurality of primary insulation panels 310 are installed on the secondary sealing wall 200 in the horizontal and vertical directions. By being arranged in one direction, the primary insulation wall 300 can be formed.

The primary and secondary insulation panels (310, 110) have plywood plywood on both the upper and lower surfaces of an insulation material made of polyurethane foam (PUF) or rigid polyurethane foam (RPUF). It may be provided as a glued sandwich panel.

The secondary insulation wall 100 may be fixed to the inner wall of the hull (H) with an adhesive such as epoxy mastic or studs, and the primary insulation wall 300 may be attached to the secondary insulation wall 100. With the secondary sealing wall 200 interposed between them, the primary insulation panel 310 is coupled to a securing device provided on the upper part of the secondary insulation panel 110, thereby creating a secondary sealing wall ( 200) can be tightly fixed to the upper part.

The secondary sealing wall 200 may be made of a flat Invar membrane. Specifically, a strip-shaped metal plate called an invar strake is continuously welded to a tongue member installed on the upper part of the secondary insulation panel 110, thereby forming the secondary sealing wall 200. It can be installed on the upper part of the secondary insulation wall 100.

A through hole may be formed in the secondary sealing wall 200 to allow a stud included in a fixing device provided on the upper part of the secondary insulation panel 110 to pass through.

The primary sealing wall 400 is in direct contact with and seals the LNG, and may be made of a stainless steel (SUS) membrane with multiple corrugations formed toward the inside of the storage tank to absorb shrinkage caused by cryogenic temperatures.

The primary sealing wall 400 may be made of a plurality of unit membranes having sizes corresponding to the unit panels of the primary insulation panel 310, and a plurality of unit membranes are provided on the upper part of the primary insulation panel 310. By welding to the anchor strip without any gaps, the primary sealing wall 400 can be installed on the upper part of the primary insulation wall 300.

The liquefied natural gas storage tank according to the present invention has a structure in which the secondary insulation panel 110 and the primary insulation panel 310 disposed on top of the secondary insulation panel 110 are interlaced with each other.

Hereinafter, with reference to FIGS. 1 to 3, we will look at the structure in which the primary insulation panel 310 and the secondary insulation panel 110 are intersecting each other.

As described above, the secondary insulation panel 110 may be provided as a sandwich panel in which plywood plywood 112 and 113 are adhered to the upper or lower surfaces or both of the upper and lower surfaces of the insulation material 111 made of polyurethane foam.

Likewise, the primary insulation panel 310 may also be prepared as a sandwich panel in which plywood plywood 312 and 313 are adhered to the upper and/or lower surfaces of an insulation material 311 made of polyurethane foam.

At this time, the primary and secondary insulation panels 310 and 110 may be manufactured as unit panels in the form of a rectangular parallelepiped with a width and length ratio of 1:3. Preferably, the primary and secondary insulation panels 310 and 110 may be manufactured as unit panels of approximately 1 m x 3 m in size, but the present invention is not limited thereto.

And as shown in the drawing, the primary insulation panels 310 may be arranged to be offset from each other so that the corner portion is placed at the center of the secondary insulation panel 110, and thus, one primary insulation panel 310 It is arranged to span the upper surfaces of the four secondary insulation panels 110 disposed at the bottom.

For the intersection of the primary insulation panel 310 and the secondary insulation panel 110, the fixing device (S1) provided for coupling them is to be placed inside the corner at the top of the secondary insulation panel 110. You can.

One fixing device (S1) is disposed at the exact center of the secondary insulation panel 110, and the remaining fixing devices are positioned at the same distance in the longitudinal direction of the panel forward and backward from the fixing device (S1) disposed at the exact center. (S1) can be arranged respectively.

At this time, the distance L1 from the fixing device S1 disposed at the exact center of the secondary insulation panel 110 to the fixing device S1 spaced apart from the front and rear is the longitudinal direction of the secondary insulation panel 110. It can be arranged to be twice the distance (L2) from the edge to the adjacent fixture (S1).

The fixing device (S1) may be disposed on the center line (C) in the width direction on the secondary insulation panel (110). Since the fixing device (S1) disposed at the center in the width direction of the secondary insulation panel 110 receives the same degree of stress from both sides, the fixing device (S1) is displaced in the width direction due to the stress acting on the panel. can be minimized.

In addition, slits 114 may be formed on the secondary insulation panel 110 at positions spaced apart by the same distance in front and behind each fixing device S1. Since the fixing device S1 disposed between the pair of slits 114 receives the same degree of stress from both sides, longitudinal displacement of the fixing device 600 due to the stress acting on the panel can be minimized. .

The spacing between the slits 114 formed on the secondary insulation panel 110 can be formed consistently, and as shown in the figure, the slits 114 are plies attached to the upper part of the secondary insulation panel 110. It can also be formed on wood plywood 112.

The fixing part (S2) provided on the primary insulation panel 310 for coupling with the fixing device (S1) may be placed at the vertical edge portion of the side end including the four corners of the primary insulation panel 310. The fixing parts S2 may be spaced apart from each other at equal intervals along the longitudinal direction of the primary insulation panel 310.

The fixing part (S2) may be provided as a groove with a semicircular or fan-shaped cross section, and the stud provided in the fixing device (S1) is inserted through the fixing part (S2) and the nut is tightened to secure the fixing part (S2). By pressing the lower plate, the primary insulation panel 310 can be fixedly installed on the secondary insulation panel 110.

In the present invention, a preferred embodiment is that three fixing devices (S1) are provided on the upper part of the secondary insulation panel 110 and eight fixing parts (S2) are provided at the vertical corners of the primary insulation panel 310. It is presented as

According to this embodiment, the fixing parts (S2) formed on the four primary insulation panels 310 are coupled to the fixing device (S1) disposed in the center of the secondary insulation panel 110 at once, and the secondary insulation panel 110 is connected to the fixing device S1 at the center of the secondary insulation panel 110. The fixing portions S2 formed on the two primary insulation panels 310 are coupled to the fixing device S1 spaced apart from the center of the panel 110 at once.

In this way, the primary insulation panels 310 adjacent to each other can share the fixing device (S1) disposed between them, and in this embodiment, three fixing devices (S1) are installed in one secondary insulation panel 110. ), it is possible to secure as many as 8 support points for the primary insulation panel 310.

In other words, the present invention is to secure the support point of the primary insulation panel 310 to the maximum even with a small number of fixing devices (S1) by intersecting the primary insulation panel 310 and the secondary insulation panel 110. This is possible, and thus the stability of the support structure is improved as well as the productivity of the insulation panel is improved.

In addition, in the present invention, the adjacent primary insulation panels 110 are simultaneously fixed by the shared fixing device (S2), thereby reducing the relative displacement between adjacent panels and improving the behavior of the panels against the load occurring within the storage tank. There is an effect that can be achieved stably.

The unexplained symbol 115 is an insertion groove into which the tongue into which the Invar strakes constituting the secondary sealing wall 200 are welded is inserted, and the unexplained numeral 315 is a protrusion of the tongue inserted into the insertion groove 115. It is a receiving groove for accommodating the bent portion of the secondary sealing wall 200 welded thereto.

In addition, the unexplained reference numeral 314 is a slit formed in the horizontal and vertical directions at regular intervals on the upper part of the primary insulation panel 310 to disperse the concentration of stress due to heat shrinkage, and the unexplained reference number 316 is a slit formed as 1 This is an anchor strip for welding the car sealing wall 400.

Meanwhile, a pump tower for loading or unloading LNG is generally provided inside a liquefied natural gas storage tank, and PTBS is installed at the bottom of the storage tank to support it. PTBS is manufactured as a cylindrical molding and is prepared in a cone shape whose diameter gradually decreases from the inner wall of the hull to a certain portion of the upper part of the primary sealing wall.

For special areas such as PTBS, which have such a special structure, the construction of insulation panels must be done differently from the general area of the storage tank.

Below, the structure of the insulation panel installed around the PTBS in the liquefied natural gas storage tank according to the present invention will be described.

Figures 4a and 4b are sequential views showing the process of installing a secondary peripheral insulation panel around the PTBS in a liquefied natural gas storage tank according to the present invention, and Figure 5 is a secondary peripheral insulation panel installed according to Figure 4. It is a drawing showing the structural analysis, and Figure 6 is a drawing schematically showing the secondary insulation wall formed in the liquefied natural gas storage tank according to the present invention containing PTBS.

As shown in the drawing, the secondary insulation panel 110' installed on the periphery of the PTBS 500 in the liquefied natural gas storage tank according to the present invention is centered to accommodate the PTBS 500, which is provided in a cone shape. A circular space may be provided.

First, referring to (a) of FIG. 4, the secondary insulation panel 110' installed on the periphery of the PTBS 500 is a pair of secondary insulation panels 110' having a semicircular inner circumferential surface to correspond to the outer circumferential surface of the PTBS 500. It can be manufactured by dividing into secondary peripheral insulation panels 120, and a pair of secondary peripheral insulation panels 120 are installed on the inner wall of the hull (H) to surround the PTBS (500).

A pair of secondary peripheral insulation panels 120 are arranged such that their semicircular inner circumferential surfaces face each other, and accordingly, the PTBS is placed in the center of the secondary insulation panel 110' installed on the periphery of the PTBS 500. A circular space in which 500 is accommodated may be formed.

A circular space in which the PTBS 500 is accommodated may be formed in the center of the secondary insulation panel 110' installed on the periphery of the PTBS 500.

The secondary peripheral insulation panel 120 is made by cutting the secondary insulation panel 110 shown in FIG. 2 in half and then cutting it out so that a semicircular inner peripheral surface is formed on one side of the cut panel. It can be produced. Therefore, the slit 124 may be formed in the secondary peripheral insulation panel 120 at the same position as the slit 114 formed in the secondary insulation panel 110.

The secondary peripheral insulation panel 120 includes an insulation material 121 made of polyurethane foam and an upper plywood 122 attached to the top of the insulation material 121.

At this time, the secondary peripheral insulation panel 120 may be manufactured with a portion of the upper plywood 122 removed from one end where a semicircular inner peripheral surface is formed.

That is, the upper plywood 122 does not extend to the end of one end of the secondary peripheral insulation panel 120, and one end of the secondary peripheral insulation panel 120 is provided with the upper surface of the insulation material 121 partially exposed. do.

More specifically, the upper surface of the insulation material 121 between one end of the secondary peripheral insulation panel 120 and the slit 124 provided closest to the one end may be exposed.

And as shown in (b) of FIG. 4, the connection portions of the secondary peripheral insulation panels 120 arranged adjacent to each other are connected by the bridge plate 123. The bridge plate 123 may be made of plywood like the upper plywood 122.

The bridge plate 123 may be arranged to span between neighboring secondary peripheral insulation panels 120, and is attached to the exposed upper surface of the insulation material 121 of each secondary peripheral insulation panel 120 with an adhesive. It can be.

The bridge plate 123 may be manufactured to have the same thickness as the upper plywood 122, so that its upper surface is flush with the upper surface of the upper plywood 122.

Once the installation of the bridge plate 123 is completed, the installation of the secondary peripheral insulation panel 120 around the PTBS 500 is completed.

In Figure 6, the structure of the secondary insulation wall 100 formed by a plurality of secondary insulation panels 110 including the secondary peripheral insulation panel 120 can be confirmed.

In this way, a pair of secondary peripheral insulation panels 120 are installed on the periphery of the PTBS (500), and then the neighboring secondary peripheral insulation panels 120 are connected with a bridge plate 123. According to , there is an effect of reducing the burden acting on the membrane layer of the secondary sealing wall 200 laminated on the upper part of the secondary peripheral insulation panel 120.

As shown in FIG. 5, the present applicant has completed verification of the structural stability of the secondary peripheral insulation panel 120 during heat shrinkage at cryogenic temperatures through structural analysis.

Figure 7 is a diagram showing the primary peripheral insulation panel installed around the PTBS in the liquefied natural gas storage tank according to the present invention, and Figure 8 is a diagram showing the primary peripheral insulation panel installed in the liquefied natural gas storage tank according to the present invention including PTBS. This is a drawing schematically showing the primary and secondary insulation walls.

As shown in Figure 1, in the liquefied natural gas storage tank according to the present invention, the primary insulation panel 310 is fixed to a fixing device (S1) whose corner portion is provided at the center of the secondary insulation panel 110. .

However, since a space for accommodating the PTBS 500 is formed in the center of the secondary insulation panel 110' installed on the periphery of the PTBS 500, no fixing device is provided in the center.

Therefore, in the present invention, the primary insulation panel 310' installed on the periphery of the PTBS 500 cannot be arranged so that the corner portion is located in the center of the secondary insulation panel 110, as shown in FIG. 7. , the corner portion must be coupled to a fixture arranged to be spaced apart in the longitudinal direction from the center of the secondary insulation panel (110, 110').

A pair of primary insulation panels 310' installed on the periphery of the PTBS 500 include a semicircular inner peripheral surface formed at the edge of the side end to correspond to the outer peripheral surface of the PTBS 500, and including this inner peripheral surface. A pair of primary insulation panels 310' are installed on the upper part of the secondary insulation wall 100 to surround the PTBS 500.

In FIGS. 7 and 8, only one primary insulation panel 310' including the inner peripheral surface is shown so as to clearly reveal the arrangement relationship with the secondary insulation panel 110, but the primary insulation panel 310' including the inner peripheral surface in the direction facing this is shown. It is obvious that the insulation panel 310' can be prepared in the same way.

In addition, a pair of primary insulation panels 310' installed on the periphery of the PTBS 500 and a pair of primary insulation panels 310 arranged adjacent to each other in the longitudinal direction of the storage tank are intersecting the insulation panels in other areas. In consideration of this, it can be manufactured and placed in separate sizes as an insulation panel (310'') of 1m x 1m and an insulation panel (310''') of 1m x 2m.

In the present invention, the PTBS 500 is described as a representative example of a special area, but it goes without saying that the insulation panel arrangement structure of the present invention as described above can be similarly applied to other special areas such as a liquid dome or a gas dome.

In the liquefied natural gas storage tank according to the present invention, the alternating arrangement between the upper and lower insulation panels 310 and 110 of the double insulating wall 300. 100 can be formed throughout the storage tank including the special area, Accordingly, the behavior of the panel against the load occurring within the storage tank can be achieved stably.

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

100: secondary insulation wall 110: secondary insulation panel
111: insulation material 112, 113: plywood plywood
114: slit 115: insertion groove
120: Secondary peripheral insulation panel 121: Insulating material
122: Upper plywood 123: Bridge plate
200: secondary sealing wall
300: Primary insulation wall 310: Primary insulation panel
311: Insulation 312, 313: Plywood plywood
314: slit 315: receiving groove
316: anchor strip
400: Primary sealing wall
500: PTBS

Claims (8)

In a liquefied natural gas storage tank in which a cylindrical PTBS is installed on the bottom to support the pump tower,
A plurality of insulation walls made of a plurality of insulation panels arranged on the inner wall of the hull; and
It includes a plurality of sealing walls respectively installed on the plurality of insulating walls,
Among the plurality of insulation panels, the insulation panel installed on the periphery of the PTBS includes a pair of peripheral insulation panels including a semicircular inner peripheral surface to correspond to the outer peripheral surface of the cylindrical PTBS,
The pair of peripheral insulation panels are arranged so that their semicircular inner peripheral surfaces face each other and surround the outer peripheral surface of the cylindrical PTBS,
It is located between the plurality of insulating walls that are stacked, and further includes a fixing device for fixing the sealing wall located between the plurality of insulating walls and the plurality of insulating walls,
In the insulation panel of the insulation wall on which the fixing device is disposed, slits are formed on both sides centered on the fixing device,
The pair of peripheral insulation panels has one end facing each other connected by a bridge plate.
Characterized by
Liquefied natural gas storage tank. delete In claim 1,
The peripheral insulation panel is,
An insulation material made of polyurethane foam,
Including an upper plywood attached to the top of the insulation material,
One end of the peripheral insulation panel where a semicircular inner peripheral surface is formed is provided with the upper surface of the insulation material partially exposed,
Liquefied natural gas storage tank. In claim 3,
The bridge plate is characterized in that it is arranged to span the exposed upper surface of the insulation material provided on each of the pair of peripheral insulation panels facing each other.
Liquefied natural gas storage tank. In claim 4,
The bridge plate is made of plywood and is attached to the exposed upper surface of the insulation material with an adhesive.
Liquefied natural gas storage tank. delete delete delete

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