KR20160004756A - Lng storage tank and insulation pannel securing device thereof - Google Patents

Lng storage tank and insulation pannel securing device thereof Download PDF

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Publication number
KR20160004756A
KR20160004756A KR1020140083671A KR20140083671A KR20160004756A KR 20160004756 A KR20160004756 A KR 20160004756A KR 1020140083671 A KR1020140083671 A KR 1020140083671A KR 20140083671 A KR20140083671 A KR 20140083671A KR 20160004756 A KR20160004756 A KR 20160004756A
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KR
South Korea
Prior art keywords
heat insulating
insulating wall
wall
primary
natural gas
Prior art date
Application number
KR1020140083671A
Other languages
Korean (ko)
Inventor
허행성
신정섭
표창민
김광석
강중규
Original Assignee
대우조선해양 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 대우조선해양 주식회사 filed Critical 대우조선해양 주식회사
Priority to KR1020140083671A priority Critical patent/KR20160004756A/en
Priority to CN201580036223.6A priority patent/CN106660617A/en
Priority to PCT/KR2015/006812 priority patent/WO2016003213A1/en
Priority to EP15814374.3A priority patent/EP3165440A4/en
Priority to US15/323,940 priority patent/US20170144733A1/en
Priority to SG11201610948XA priority patent/SG11201610948XA/en
Publication of KR20160004756A publication Critical patent/KR20160004756A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/02—Wall construction
    • B65D90/06—Coverings, e.g. for insulating purposes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
    • F17C1/12—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge with provision for thermal insulation

Abstract

The present invention relates to a liquefied natural gas storage tank and a liquefied natural gas storage tank that can be slid in a horizontal direction to reduce thermal stress. According to an embodiment of the present invention, there is provided a storage tank for storing liquefied natural gas, comprising: a primary sealing wall contacting the liquefied natural gas stored in the storage tank and liquid-tightly liquefying the liquefied natural gas; A primary insulation wall positioned below the primary sealing wall to insulate the liquefied natural gas; A secondary insulation wall installed on an inner wall of the storage tank to insulate the liquefied natural gas; And a heat insulating wall fixing device for fixing the primary heat insulating wall to the secondary heat insulating wall in such a structure that the primary heat insulating wall can slide in the horizontal direction.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a liquefied natural gas storage tank and a liquefied natural gas storage tank,

The present invention relates to a liquefied natural gas storage tank, and more particularly, to a liquefied natural gas storage tank and a liquefied natural gas storage tank which are constructed such that a primary heat insulating wall can slide in a horizontal direction to reduce thermal stress. To an insulating wall fixing device.

Natural gas is a fossil fuel containing methane as a main component and a small amount of ethane, propane, and the like, and has recently been regarded as a low-pollution energy source in various technical fields.

Natural gas is transported in a gaseous state through land or sea gas pipelines, or is transported to a remote location where it is stored in an LNG carrier in the form of liquefied natural gas (LNG). Liquefied natural gas is obtained by cooling natural gas at a cryogenic temperature (below about -163 ° C), and its volume is reduced to about 1/600 of that of natural gas, making it well suited for long-distance transport through the sea.

Liquefied natural gas carriers are equipped with cargo tanks (also called cargo tanks) that can store and store liquefied natural gas that has been liquefied by cooling natural gas. Since the boiling point of liquefied natural gas is about -162 ° C at atmospheric pressure, the storage tank for liquefied natural gas is a material that can withstand extremely low temperatures such as aluminum, stainless steel and 35% nickel steel to safely store and store liquefied natural gas. And is designed to have a structure resistant to thermal stress and heat shrinkage and to prevent heat penetration.

 LNG RV (Regasification Vessel), which transports LNG carriers and LNG for unloading LNG to land customers by landing LNG and landing on land, reclaiming stored LNG after arriving at land demand and unloading it into natural gas, Floating marine structures such as LNG FPSO (Floating, Production, Storage and Offloading) and LNG FSRU (FSRU) also include storage tanks installed in LNG carriers or LNG RVs.

LNG FPSO is a floating marine structure that is used to liquefy natural gas produced directly from the sea and store it in a storage tank and, if necessary, to transfer the LNG stored in this storage tank to an LNG carrier. In addition, the LNG FSRU is a floating type of floating structure that stores LNG unloaded from LNG carriers in offshore sea, stores it in a storage tank, vaporizes LNG if necessary, and supplies the LNG to the customer.

 In this way, a storage tank for storing LNG in a cryogenic condition is installed in a marine structure such as an LNG carrier, LNG RV, LNG FPSO, and LNG FSRU that transports or stores a liquid cargo such as LNG.

 Such a storage tank can be classified into an independent tank type and a membrane type depending on whether the load of the cargo directly acts on the heat insulating material. Membrane-type storage tanks are divided into GTT NO 96 type and TGZ Mark III type. Independent tank type storage tanks are divided into MOSS type and IHI-SPB type.

1 is a schematic view showing the structure of a GTT NO 96 type storage tank which is a type of a liquefied natural gas storage tank of the prior art.

1, the GTT NO 96 type storage tank has a structure in which a primary sealing wall 130, a primary insulating wall 110, a secondary sealing wall 140, and a secondary insulating wall 120 are stacked to be. The primary sealing power 130 and the secondary sealing wall 140 are made of Invar steel (36% Ni) having a thickness of 0.5 to 1.5 mm, and the primary sealing wall and the secondary sealing wall are almost the same By having liquid tightness and strength, the cargo can safely be supported by the secondary sealing wall only for a considerable period of time when the primary sealing wall is leaked. In addition, since the membrane of GTT NO 96 type is linear, it is easier to weld than TGZ Mark Ⅲ type corrugated membrane, and the rate of automation is higher than that of TGZ Mark Ⅲ type. However, overall welding length is longer than that of TGZ Mark Ⅲ type.

The primary heat insulating wall 110 and the secondary heat insulating wall 120 are made of a plywood box and perlite and the vertical member 150 of the plywood material is arranged and pearlite And nitrogen gas.

2 is a schematic view showing the structure of a TGZ Mark III type storage tank, which is one type of a liquefied natural gas storage tank of the prior art.

Referring to FIG. 2, the TGZ Mark III type storage tank has a structure in which a primary sealing wall 230, a primary heat insulating wall 210, a secondary sealing wall 240, and a secondary heat insulating wall 220 are laminated. The primary sealing wall 230 is made of a stainless steel membrane having a thickness of 1.2 mm as a portion directly contacting the liquefied natural gas stored in the storage tank and the secondary sealing wall 240 is made of a triplex.

The primary heat insulating wall 210 and the secondary heat insulating wall 220 are made of polyurethane foam or the like. At this time, in order to fix the primary insulating wall 210 and the secondary insulating wall 220 to each other, the primary insulating wall 210, the secondary sealing wall 240, and the secondary insulating wall are adhered to each other.

The TGZ Mark III type storage tank is formed by laminating the primary insulation wall 210 and the secondary insulation wall 220 with an adhesive agent. The primary insulation wall 210 is located close to the liquefied natural gas at a low temperature, There is a problem in that it is not stable against heat shrinkage. When the adhesive is used, there is a concern that the adhesive is difficult to work at the time of installation and the adhesive can be maintained for a long period of time. Also, since the secondary sealing wall 240 is made of a composite material, there is a problem in the watertightness performance of the secondary sealing wall 240.

In addition, the GTT NO 96 type storage tank has a disadvantage of high manufacturing cost since the primary sealing wall and the secondary sealing wall are made of expensive invar steel.

Prior art: Korean Patent Laid-Open No. 10-2013-0113134 (published Oct. 15, 2013)

It is an object of the present invention to provide a liquefied natural gas storage tank that is stable to heat shrinkage, can improve ease of installation and preparation, and can reduce manufacturing costs.

According to an aspect of the present invention, there is provided a storage tank for storing liquefied natural gas, comprising: a primary sealing wall contacting the liquefied natural gas stored in the storage tank and liquid-tightly liquefying the liquefied natural gas; A primary insulation wall positioned below the primary sealing wall to insulate the liquefied natural gas; A secondary insulation wall installed on an inner wall of the storage tank to insulate the liquefied natural gas; And a heat insulating wall fixing device for fixing the primary heat insulating wall to the secondary heat insulating wall in such a structure that the primary heat insulating wall can slide in the horizontal direction.

In particular, the heat insulating wall fixing device includes a stud bolt fixed to the secondary heat insulating wall; Wherein the stud bolt is inserted into the through hole and is fastened to the nut so that the primary heat insulating wall is inserted into the secondary heat insulating wall, Can be fixed to the wall.

The heat insulating wall fixing device may further include a special washer inserted between the lower plate of the primary heat insulating wall and the nut so as not to be detached from the heat insulating wall fixing device even if the lower plate of the primary heat insulating wall shrinks .

The heat insulating wall fixing device may further include a spring washer inserted between the special washer and the nut to prevent the nut from being released when the lower plate of the primary heat insulating wall shrinks in the height direction.

Further, a strip of a metal material may be provided on the upper plate of the secondary insulation wall, and the stud bolt may be fixed to the strip

Further, a first thread is formed on the strip, and a second thread is formed on the stud bolt, so that the first thread and the second thread are engaged with each other, so that the stud bolt can be fixed to the strip.

The heat insulating wall fixing device may further include a spacer which fits around the side surface of the nut to protect the bolt and the nut.

The storage tank may further include a secondary sealing wall positioned between the primary insulating wall and the secondary insulating wall to liquid-tighten the liquefied natural gas when the primary sealing wall leaks.

Further, the primary sealing wall and the secondary sealing wall may be made of stainless steel

In addition, the storage tank may further include a plug that closes a hole required for installation work of the heat insulating wall fixing device.

According to another aspect of the present invention, there is provided an insulation wall fixing device for fixing a primary insulation wall to a secondary insulation wall in a storage tank for storing liquefied natural gas, The primary heat insulating wall is fixed to the secondary heat insulating wall with a structure in which the primary heat insulating wall can slide in the horizontal direction and the secondary heat insulating wall is installed on the inner wall of the storage tank to insulate the liquefied natural gas And the primary heat insulating wall is located above the secondary heat insulating wall to insulate the liquefied natural gas.

In particular, the heat insulating wall fixing device includes a stud bolt fixed to the secondary heat insulating wall; Wherein the stud bolt is inserted into the through hole and is fastened to the nut so that the primary heat insulating wall is inserted into the secondary heat insulating wall, Can be fixed to the wall.

The heat insulating wall fixing device may further include a special washer inserted between the lower plate of the primary heat insulating wall and the nut so as not to be detached from the heat insulating wall fixing device even if the lower plate of the primary heat insulating wall shrinks .

The heat insulating wall fixing device may further include a spring washer inserted between the special washer and the nut to prevent the nut from being released when the lower plate of the primary heat insulating wall shrinks in the height direction.

Further, a strip of a metal material may be provided on the upper plate of the secondary heat insulating wall, and the stud bolt may be fixed to the strip.

Further, a first thread is formed on the strip, and a second thread is formed on the stud bolt, so that the first thread and the second thread are engaged with each other, so that the stud bolt can be fixed to the strip.

The heat insulating wall fixing device may further include a spacer which fits around the side surface of the nut to protect the bolt and the nut.

In addition, the heat insulating wall fixing device can be installed at the vertex of the primary heat insulating wall.

According to the embodiment of the present invention, the primary heat insulating wall can slide in the horizontal direction at the time of heat shrinking to minimize thermal stress, so that the liquefied gas storage tank is stable to heat shrinkage.

According to the embodiment of the present invention, by installing the plug in a bolting manner, there is an advantage that the plug installation work is easy, the working time is shortened, and the retention force is strong and stable.

According to the embodiment of the present invention, by providing the heat insulating wall fixing device at the edge of the primary heat insulating wall, the primary heat insulating wall can be stably fixed and the number of necessary heat insulating wall fixing devices can be minimized

1 is a schematic view showing the structure of a GTT NO 96 type storage tank which is a type of a liquefied natural gas storage tank of the prior art.
2 is a schematic view showing the structure of a TGZ Mark III type storage tank, which is one type of a liquefied natural gas storage tank of the prior art.
3 is a cross-sectional view of an exemplary vessel equipped with a liquefied natural gas storage tank according to an embodiment of the present invention.
4 is a cross-sectional view of a heat insulating structure of a liquefied natural gas storage tank according to an embodiment of the present invention.
5 is a perspective view of a heat insulating structure of a liquefied natural gas storage tank according to an embodiment of the present invention.
6 is a view showing a structure of an adiabatic wall fixing apparatus of a liquefied natural gas storage tank according to an embodiment of the present invention.
7 is a view showing a method of installing a plug of a heat insulating wall fixing device of a liquefied natural gas storage tank according to an embodiment of the present invention.
8 is a view showing the direction in which the primary heat insulating wall shrinks.
9 is a view showing deformation caused by heat shrinkage of the primary heat insulating wall.
10 is a view showing the position of the heat insulating wall fixing device of the liquefied natural gas storage tank according to the embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

First, referring to FIG. 3, a structure of a ship having a liquefied natural gas storage tank according to an embodiment of the present invention will be described. 3 is a cross-sectional view of an exemplary vessel equipped with a liquefied natural gas storage tank according to an embodiment of the present invention.

3, the liquefied natural gas storage tank according to the present invention may be installed in the ship 300, and the ship 300 may include an outer wall 310 forming an outer shape, And has a double structure of an inner wall 320 formed therein. The inner wall 320 and the outer wall 310 of the ship 300 are connected to each other by a connecting rib 330 and may be integrally formed with the inner wall 320. In some cases, have. On the other hand, only the upper part of the ship 300 may be formed as a single deck, and the shape thereof may be variously changed according to the size of the ship 300 or the storage capacity.

Also, the inside of the inner wall 320 may be divided by one or more barrier ribs 340, and the barrier ribs 340 may form a copper dam.

Here, the sealing wall 350 may be formed in a wrinkle portion to meet the temperature change of the liquefied natural gas (LNG) stored in the storage tank in contact with the liquefied natural gas (LNG)

A heat insulating wall 360 for insulating the storage tank is formed between the sealing wall 350 and the inner wall 320. At this time, the heat insulating wall 360 is composed of a primary heat insulating wall and a secondary heat insulating wall, and a sealing wall may be provided between the primary heat insulating wall and the secondary heat insulating wall.

Next, with reference to FIGS. 4 and 5, a heat insulation structure of a liquefied natural gas storage tank according to an embodiment of the present invention will be described. FIG. 4 is a sectional view of a heat insulating structure of a liquefied natural gas storage tank according to an embodiment of the present invention, and FIG. 5 is a perspective view of a heat insulating structure of a liquefied natural gas storage tank according to an embodiment of the present invention.

4 and 5, the liquefied natural gas storage tank according to the embodiment of the present invention includes a primary sealing wall 410, a primary insulating wall 420, a secondary sealing wall 430, Wall 440 and an adiabatic wall securing device 450.

The primary sealing wall 410 is installed on the primary heat insulating wall 420 and is in contact with the liquefied natural gas to liquid-tighten the liquefied natural gas (LNG) stored in the storage tank.

The secondary sealing wall 430 is provided between the primary heat insulating wall 420 and the secondary heat insulating wall 440 and functions to liquid-tighten the liquefied natural gas when the primary sealing wall 410 leaks.

The primary sealing wall 410 and the secondary sealing wall 430 are formed with a plurality of corrugated portions for preventing shrinkage due to a temperature change and damage during stretching. The corrugated portion is elongated or contracted by the temperature change of the liquefied natural gas according to the line load to prevent damage due to thermal deformation applied to the primary sealing wall 410 and the secondary sealing wall 430. As shown in FIG. 5, a larger number of wrinkles than the secondary sealing wall 430 is formed in the primary sealing wall 430. This is because the primary sealing wall 430 is in direct contact with the liquefied natural gas, and the degree of elongation and contraction due to the temperature change is larger than that of the secondary sealing wall 430.

The primary sealing wall 410 and the secondary sealing wall 430 may be made of stainless steel

The primary insulation wall 420 is positioned below the primary sealing wall 410 to insulate the liquefied natural gas and the secondary insulation wall 440 is installed on the inner wall of the liquefied natural gas storage tank to insulate the liquefied natural gas . That is, the secondary insulation wall 440 is installed on the inner wall of the liquefied natural gas storage tank, and the primary insulation wall 420 is located on the upper part of the secondary insulation wall 440.

The primary heat insulating wall 420 and the secondary heat insulating wall 440 are composed of an upper plate, a lower plate, and a heat insulating material formed between the upper plate and the lower plate. The upper plate and the lower plate may be made of a plywood material, and the heat insulating material may be formed of a polyurethane foam.

A primary sealing wall 410 directly contacting the liquefied natural gas is installed on the top plate of the primary heat insulating wall 420. A strip of metal material 460 is installed on the top plate of the primary insulation wall 420 and the primary sealing wall 410 is welded to the strip 460.

A secondary sealing wall 430 is provided on the upper plate of the secondary heat insulating wall 440. A strip of metal material is installed on the top plate of the secondary insulation wall 440 and a secondary sealing wall 430 is welded to the strip 460.

The heat insulating wall fixing device 450 fixes the primary heat insulating wall 420 and the secondary heat insulating wall 440. The heat insulating wall fixing device 450 has a structure in which the primary heat insulating wall 420 can slide in the horizontal direction, (440).

FIG. 6 is a view showing a structure of a heat insulating wall fixing device for a liquefied natural gas storage tank according to an embodiment of the present invention, and FIG. 7 is a perspective view of a plug of a heat insulating wall fixing device of a liquefied natural gas storage tank according to an embodiment of the present invention Fig.

6, the insulating wall retainer 450 includes a stud bolt 620, a special washer 630, a spring washer 640, a nut 650 and a spacer 660. As shown in FIG.

A strip 610 of a metal material is provided on an upper plate of the secondary heat insulating wall 440, and a stud bolt 620 is fixed to the strip. The stud bolt 620 is fixed to the strip 610 by screwing the thread of the strip 610 and the thread of the stud bolt 620 into engagement with each other, do

The primary heat insulating wall 420 and the secondary sealing wall 430 are previously provided with through holes at the positions where the heat insulating wall fastening devices 450 are installed. When the primary heat insulating wall 420 and the secondary sealing wall 430 are installed on the secondary heat insulating wall 440, the stud bolts 620 are inserted through the primary heat insulating wall 420 and the secondary sealing wall 430 Insert it into the hole. Then, after inserting the special washer 630 and the spring washer 640, the nut 650 is fastened to the stud bolt 620 to fix the primary heat insulating wall 420 to the secondary heat insulating wall 440.

The special washer 630 serves to prevent the lower plate of the primary heat insulating wall 420 from being detached from the heat insulating wall fixing device 450 even if it shrinks. The special washer 630 has a larger diameter than the diameter of the nut 650 to secure a large area where the lower plate of the primary heat insulating wall 420 can slide.

The spring washer 640 can prevent the nut 650 from being released when the lower plate of the primary heat insulating wall 420 contracts in the height direction.

After the nut 650 is fastened to the stud bolt 620, the spacer 660 can be inserted. The spacer 660 is a donut-shaped structure that surrounds the side surface of the nut and can be made of plywood. The spacer 650 serves to protect the bolt and the nut by dispersing the load of the liquefied natural gas.

According to the heat insulating wall fixing device 450 according to the embodiment of the present invention, since the lower plate of the primary heat insulating wall 420 can slide between the secondary sealing wall 430 and the special washer 630, The heat insulating wall 420 slides in the horizontal direction when the heat shrinks, so that the thermal stress can be minimized.

A plug 670 blocks the holes necessary for installing the heat insulating wall fastening device 450.

A hole is formed in the primary heat insulating wall for installing the heat insulating wall fixing device 450. When the installation of the heat insulating wall fixing device 450 is completed and this hole is left as it is, There arises a problem that a structural problem may arise in the insulation system of the storage tank and an increase of the boil off rate (BOR). Thus, the plug 670 closes the hole. Therefore, after inserting the spacer 660, the plug 670 is inserted and the plug 670 is fixed. 7, a thread is formed on the bottom surface of the plug 670 so as to be coupled with the stud bolt 620, so that the upper portion of the plug 670 and the heat insulating wall fixing device 450 is bolted ).

The plug 670 is in the form of a cylinder and may be composed of an upper plate, a heat insulating material, a lower plate, and a lower cap. The upper plate and the lower plate may be made of a plywood material, and the heat insulating material may be a polyurethane foam material.

The lower cap is located below the lower plate and consists of a cap portion and a flange extending radially from the lower end of the cap portion. The bottom plate has a hole formed at its center portion, so that the cap portion of the lower cap can be inserted into the hole. A thread is formed on the inside of the cap portion so that a threaded portion is fastened to the upper portion of the stud bolt 620 so that the plug 670 is attached to the heat insulating wall fastening device 450.

According to the embodiment of the present invention, there is an advantage in that the operation is easier, the working time is reduced, and the holding force is stronger than in the case where the plug 670 is installed using an adhesive.

Next, the position of the heat insulating wall fixing device of the liquefied natural gas storage tank according to the embodiment of the present invention will be described with reference to FIGS. 9 is a view showing a deformation of the primary heat insulating wall due to heat shrinkage, and Fig. 10 is a cross-sectional view of a liquefied natural gas storage tank according to an embodiment of the present invention. Fig. And the position of the heat insulating wall fixing device of FIG.

The shape of deformation of the primary heat insulating wall 420 varies depending on the position of the heat insulating wall fixing device 450 when the primary heat insulating wall 420 is contracted. As shown in Fig. 8, the primary heat insulating wall 420 contracts toward the center when heat shrinks. As shown in FIG. 9, since the primary heat insulating wall 420 has a temperature deviation in the thickness direction, a force that the primary heat insulating wall 420 is tilted upward generates a step. These slopes can be a structural risk factor for liquefied natural gas storage tanks if sloshing occurs in the operating situation. In order to effectively reduce the level difference, it is very effective to provide the heat insulating wall fixing device 450 at the edge of the primary heat insulating wall 420.

Therefore, as shown in FIG. 10, the heat insulating wall fixing device 450 is installed at the vertex of the primary heat insulating wall 420. Further, additional heat insulating wall fastening devices 450 may be installed at equal intervals on the edge of the primary heat insulating wall 420. 10, the primary heat insulating wall 420 is 3 m in width and 1 m in height, and the heat insulating wall fixing device 450 is installed every 1 m. 10, a total of eight heat insulating wall fastening devices 450 are installed. However, the present invention is not limited to this, and includes a case where a plurality of heat insulating wall fastening devices 450 are installed.

As in the embodiment of the present invention, when the heat insulating wall fixing device 450 is installed at the edge of the primary heat insulating wall 420, a plurality of primary heat insulating walls 420 are fixed to the single heat insulating wall fixing device 450 Can be fixed. That is, the heat insulating wall fixing device 450 provided at the vertex of the primary heat insulating wall 420 can fix the four primary heat insulating walls 420 and can fix the four heat insulating walls 420 installed at the corners of the primary heat insulating wall 420, The device 450 can secure the two primary heat insulating walls 420. Therefore, according to the embodiment of the present invention, the number of the heat insulating wall fixing devices 450 can be minimized.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

410: primary sealing wall
420: Primary insulation wall
430: Secondary sealing wall
440: Secondary insulation wall
450: Insulation wall fixing device
460: strip
620: Stud bolt
630: Special Washer
640: Spring washer
650: Nut
660: Spacer
670: Plug

Claims (18)

A storage tank for storing liquefied natural gas,
A primary sealing wall contacting the liquefied natural gas stored in the storage tank and liquid-tightly liquefying the liquefied natural gas;
A primary insulation wall positioned below the primary sealing wall to insulate the liquefied natural gas;
A secondary insulation wall installed on an inner wall of the storage tank to insulate the liquefied natural gas; And
And a heat insulating wall fixing device for fixing the primary heat insulating wall to the secondary heat insulating wall with a structure in which the primary heat insulating wall can slide in a horizontal direction. Claim 1
The heat insulating wall fixing device
A stud bolt fixed to the secondary heat insulating wall;
And a nut fastened to the stud bolt,
Wherein a through hole is formed in the primary heat insulating wall and the stud bolt is inserted into the through hole and then is fastened to the nut to fix the primary heat insulating wall to the secondary heat insulating wall. The method of claim 2,
Wherein the heat insulating wall fixing device further comprises a special washer inserted between the lower plate of the primary heat insulating wall and the nut to prevent the bottom plate of the primary heat insulating wall from being detached from the heat insulating wall fixing device even if the lower plate shrinks. Claim 3
Wherein the heat insulating wall fixing device further comprises a spring washer inserted between the special washer and the nut to prevent the nut from being released when the lower plate of the primary heat insulating wall shrinks in the height direction. The method of claim 2,
Wherein a strip of a metal material is provided on an upper plate of the secondary insulation wall, and the stud bolt is fixed to the strip. The method of claim 5,
Wherein a first thread is formed in the strip and a second thread is formed in the stud bolt such that the first thread and the second thread engage to fix the stud bolt to the strip. The method of claim 2,
Wherein the heat insulating wall fixing device further comprises a spacer which fits around a side surface of the nut to protect the bolt and the nut. The method according to claim 1,
Further comprising a secondary sealing wall positioned between the primary insulating wall and the secondary insulating wall to liquid-tighten the liquefied natural gas when the primary sealing wall leaks. The method of claim 8,
Wherein the primary sealing wall and the secondary sealing wall are made of stainless steel. The method according to claim 1,
Further comprising a plug that closes a hole necessary for installation work of the heat insulating wall fastening device. An insulation wall fixing device for fixing a primary insulation wall to a secondary insulation wall in a storage tank for storing liquefied natural gas,
The heat insulating wall fixing device fixes the primary heat insulating wall to the secondary heat insulating wall in such a structure that the primary heat insulating wall can slide in the horizontal direction and the secondary heat insulating wall is installed on the inner wall of the storage tank Insulates the liquefied natural gas, and the primary insulation wall is positioned above the secondary insulation wall to insulate the liquefied natural gas. Claim 11
The heat insulating wall fixing device
A stud bolt fixed to the secondary heat insulating wall;
And a nut fastened to the stud bolt,
Wherein a through hole is formed in the primary heat insulating wall and the stud bolt is inserted into the through hole and then is fastened to the nut to fix the primary heat insulating wall to the secondary heat insulating wall. The method of claim 12,
Wherein the heat insulating wall fixing device further comprises a special washer inserted between the lower plate of the primary heat insulating wall and the nut so as not to be detached from the heat insulating wall fixing device even if the lower plate of the primary heat insulating wall shrinks, Device. Claim 13
Wherein the heat insulating wall fixing device further comprises a spring washer inserted between the special washer and the nut to prevent the nut from being released when the lower plate of the primary heat insulating wall shrinks in the height direction. The method of claim 12,
Wherein a strip of a metal material is provided on an upper plate of the secondary insulation wall, and the stud bolt is fixed to the strip. 16. The method of claim 15,
Wherein a first thread is formed on the strip and a second thread is formed on the stud bolt such that the first thread and the second thread are engaged to fix the stud bolt to the strip. The method of claim 12,
Further comprising: a spacer which surrounds the side surface of the nut and is inserted and fitted to protect the bolt and the nut. The method of claim 11,
Wherein the heat insulating wall fixing device is installed at a vertex of the primary heat insulating wall.
KR1020140083671A 2014-07-04 2014-07-04 Lng storage tank and insulation pannel securing device thereof KR20160004756A (en)

Priority Applications (6)

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KR1020140083671A KR20160004756A (en) 2014-07-04 2014-07-04 Lng storage tank and insulation pannel securing device thereof
CN201580036223.6A CN106660617A (en) 2014-07-04 2015-07-02 Liquefied natural gas storage tank and insulating wall securing device for liquefied natural gas storage tank
PCT/KR2015/006812 WO2016003213A1 (en) 2014-07-04 2015-07-02 Liquefied natural gas storage tank and insulating wall securing device for liquefied natural gas storage tank
EP15814374.3A EP3165440A4 (en) 2014-07-04 2015-07-02 Liquefied natural gas storage tank and insulating wall securing device for liquefied natural gas storage tank
US15/323,940 US20170144733A1 (en) 2014-07-04 2015-07-02 Liquefied natural gas storage tank and insulating wall securing device for liquefied natural gas storage tank
SG11201610948XA SG11201610948XA (en) 2014-07-04 2015-07-02 Liquefied natural gas storage tank and insulating wall securing device for liquefied natural gas storage tank

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180032811A (en) * 2016-09-23 2018-04-02 삼성중공업 주식회사 Liquefied gas storage tank
US20200049314A1 (en) * 2017-03-15 2020-02-13 Gaztransport Et Technigaz Thermally insulating sealed tank comprising a reinforcing insulating plug
CN112912661A (en) * 2018-08-24 2021-06-04 气体运输技术公司 Thermally insulated and sealed container wall

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180032811A (en) * 2016-09-23 2018-04-02 삼성중공업 주식회사 Liquefied gas storage tank
US20200049314A1 (en) * 2017-03-15 2020-02-13 Gaztransport Et Technigaz Thermally insulating sealed tank comprising a reinforcing insulating plug
CN112912661A (en) * 2018-08-24 2021-06-04 气体运输技术公司 Thermally insulated and sealed container wall
CN112912661B (en) * 2018-08-24 2022-08-30 气体运输技术公司 Container wall, container, ship, transport system and method for loading or unloading a ship

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