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KR100807961B1 - Insulation system with welded type secondary barrier for LNG tank - Google Patents

Insulation system with welded type secondary barrier for LNG tank Download PDF

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Publication number
KR100807961B1
KR100807961B1 KR1020060047903A KR20060047903A KR100807961B1 KR 100807961 B1 KR100807961 B1 KR 100807961B1 KR 1020060047903 A KR1020060047903 A KR 1020060047903A KR 20060047903 A KR20060047903 A KR 20060047903A KR 100807961 B1 KR100807961 B1 KR 100807961B1
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South Korea
Prior art keywords
secondary barrier
insulation plate
barrier
insulation
welding
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KR1020060047903A
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Korean (ko)
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KR20070114417A (en
Inventor
소용신
이철희
우한영
김대영
윤중근
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현대중공업 주식회사
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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
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/001—Thermal insulation specially adapted for cryogenic vessels
    • 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
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0612—Wall structures
    • F17C2203/0614—Single wall
    • F17C2203/0619—Single wall with two layers
    • 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
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0636—Metals
    • 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
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/22—Assembling processes
    • F17C2209/221—Welding
    • 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
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • 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
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • 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
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0146—Two-phase
    • F17C2225/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2225/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • 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
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0102—Applications for fluid transport or storage on or in the water
    • F17C2270/0105—Ships

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

본 발명은 용접 접합용 2차 방벽을 구비하는 액화천연가스 저장용기용 단열시스템에 관한 것으로, 그 목적은 2차 방벽을 용접에 의해 밀봉 연결하여, 작업을 용이하게 하고, 우수한 단열성 및 기밀성을 구비할 수 있는 용접 접합용 2차 방벽을 구비하는 액화천연가스 저장용기용 단열시스템을 제공하는 것이다. The present invention relates to a heat insulating system for a LNG storage container having a secondary barrier for welding and joining, the object of which is to seal and connect the secondary barrier by welding, to facilitate work, and to provide excellent heat insulation and airtightness. It is to provide a thermal insulation system for a liquefied natural gas storage container having a secondary barrier for welding bonding.

본 발명은 상부에 1차 단열판을 구비하고, 하부에 2차 단열판을 구비하며, 상기 2차 단열판의 연결부위 상부에 연결용 단열판이 설치되고, 상기 1차 단열판 및 연결용 단열판의 상부에 1차 방벽이 설치되며, 상기 1차 단열판과 2차 단열판 사이에 2차 방벽이 위치하는 이중 방벽구조의 액화천연가스 저장용기용 단열시스템에 있어서, 상기 2차 방벽은 끝단에 상부방향으로 돌출되어 형성된 금속재질의 접촉대를 구비하고, 일측 2차 방벽의 접촉대에 또다른 2차방벽의 접촉대가 접촉되도록 설치되며, 접촉되는 접촉대가 용접에 의해 밀봉되도록 구성되어 있다.The present invention is provided with a primary insulation plate in the upper portion, a secondary insulation plate in the lower portion, a connection insulation plate is installed in the upper portion of the connection portion of the secondary insulation plate, the primary insulation plate and the upper portion of the insulation plate for connection In the insulation system for a liquefied natural gas storage container of a double barrier structure wherein a barrier is installed and a secondary barrier is positioned between the primary insulation plate and the secondary insulation plate, the secondary barrier is formed by protruding upward at the end. It is provided with a contact stand of a material, it is installed so that the contact stand of another secondary barrier may contact the contact stand of one side secondary barrier, and the contact stand which is contacted is comprised so that it may be sealed by welding.

단열구조, 액화천연가스, 저장용기, 용접, 2차방벽 Insulation Structure, LNG, Storage Container, Welding, Secondary Barrier

Description

용접 접합용 2차 방벽을 구비하는 액화천연가스 저장용기용 단열시스템{Insulation system with welded type secondary barrier for LNG tank}Insulation system with welded type secondary barrier for LNG tank

도 1 은 본 발명에 따른 2차방벽의 개략적 구성을 보인 예시도1 is an exemplary view showing a schematic configuration of a secondary barrier according to the present invention

도 2 는 본 발명에 따른 용접형 2차방벽을 적용한 단열시스템의 개략적 구성을 보인 예시도2 is an exemplary view showing a schematic configuration of an insulation system to which a welded secondary barrier according to the present invention is applied.

도 3 은 본 발명에 따른 초박판 금속 2차방벽을 적용한 단열시스템의 개략적 구성을 보인 예시도3 is an exemplary view showing a schematic configuration of an insulation system to which the ultra-thin metal secondary barrier according to the present invention is applied;

도 4 는 종래의 단열구조를 보인 예시도Figure 4 is an exemplary view showing a conventional heat insulation structure

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

(10) : 1차 단열판 (20) : 2차 단열판(10): primary insulation board (20): secondary insulation board

(30) : 연결용 단열판 (31) : 홈(30): insulation board for connection 31: groove

(40) : 1차방벽 (41) : 1차방벽 연결부(40): primary barrier (41): primary barrier connection

(50) : 2차방벽 (51) : 용접형 2차방벽(50): secondary barrier (51): welded secondary barrier

(52) : 초박판 금속 2차방벽 (53) : 접촉대(52): ultra-thin metal secondary barrier (53): contact table

(60) : 용접부위 (70) : 선체(60): welded area (70): hull

(80) : 선체 단열판 연결부 (511) : 금속연결부(80): hull insulation plate connection (511): metal connection

(512) : 섬유부512: fiber part

본 발명은 용접 접합용 2차 방벽을 구비하는 액화천연가스 저장용기용 단열시스템에 관한 것으로, 2차 방벽의 끝단을 용접에 의해 연결하여 작업성과 기밀성을 획기적으로 향상시킨 용접 접합용 2차 방벽을 구비하는 액화천연가스 저장용기용 단열시스템에 관한 것이다.The present invention relates to a thermal insulation system for a LNG storage container having a secondary barrier for welding joint, and further comprising a secondary barrier for welding joint that significantly improves workability and airtightness by connecting the ends of the secondary barrier by welding. It relates to a thermal insulation system for liquefied natural gas storage container provided.

오늘날, 수소, 산소 및 천연가스와 같은 물질을 대량으로 저장 및 수송하기 위하여 주로 저온 액화방법을 이용하고 있는데 그러기 위하여 저온의 액화가스를 저장 수송하는 단열용기의 설계에 있어서 외부로부터의 열침입에 의한 액화가스의 비등을 방지하는 단열기술이 무엇보다도 중요하다.Today, the low temperature liquefaction method is mainly used to store and transport large quantities of substances such as hydrogen, oxygen and natural gas. Therefore, in the design of a thermal insulation container storing and transporting low temperature liquefied gas, The insulation technology to prevent the boiling of liquefied gas is important above all.

현재 상업적으로 고안 적용되고 있는 단열방법은 외부 단열방법과 내부 단열방법이 있으며, 상기 내부 단열방법은 용기 외함의 온도를 외기온도와 유사하게 제어할 수 있으므로, 저온용 소재의 적용과 같은 소재 사용에 제약이 없는 장점이 있다. 이와 같은 내부 단열방법에는 미국의 맥도널 더글라스사의 중간방벽구조(미국특허 제 484358 호)를 기초로 2중방벽 구조를 가지는 프랑스 지티티(GTT)사의 멤브레인형 단열시스템이 알려져 있다. Insulation methods currently commercially designed and applied include an external insulation method and an internal insulation method, and the internal insulation method can control the temperature of the container enclosure similarly to the outside temperature, thereby limiting the use of materials such as the application of low-temperature materials. There is no advantage to this. As such an internal insulation method, a membrane-type insulation system of GTT, France, which has a double barrier structure based on the middle barrier structure (US Patent No. 484358) of McDonald Douglas, USA, is known.

도 4 는 종래의 단열구조인 프랑스 지티티(GTT)사의 마크(Mark) Ⅲ형 단열구조를 도시한 것으로, 상기 단열시스템은 상부의 1차 단열판(10)과 하부의 2차 단열판(20) 그리고 스테인레스강으로 이루어진 1차 방벽(40)과, 용접형로 이루어진 2차 방벽(50)의 이중 방벽구조로 구성되어 있으며, 이러한 단열시스템은 단열판을 단열용기 내벽에 설치할 때, 2차방벽의 접합부에서 기밀성을 확보할 목적으로 단열판 사이의 접합부를 용접형라는 2차방벽 소재로 접착하고, 다시 그 위를 1차 단열판과 동일 재질의 연결판으로 작업하는 2단계 작업에 의해 설치되도록 되어 있어, 작업에 많은 시간이 소요될 뿐만 아니라, 2차 방벽 접합부에서의 기밀성을 확보하는데 상당한 시공상의 주의를 필요로 하는 등 많은 문제점이 있었다. 4 shows a Mark III type insulation structure of GTT, France, which is a conventional insulation structure, wherein the insulation system includes a primary insulation plate 10 at an upper portion and a secondary insulation plate 20 at a lower portion thereof. It is composed of the double barrier structure of the primary barrier 40 made of stainless steel and the secondary barrier 50 made of welding type, and this insulation system is installed at the junction of the secondary barrier when the insulation plate is installed on the inner wall of the insulation container. In order to ensure the airtightness, the joints between the insulation boards are bonded by a secondary barrier material called welded type, and then they are installed by a two-stage operation that works on the connection plate made of the same material as the primary insulation board. Not only does it take a lot of time, there are many problems such as requiring considerable construction attention to ensure airtightness at the secondary barrier joint.

본 발명은 상기와 같은 문제점을 해소하기 위한 것으로, 그 목적은 2차 방벽을 용접에 의해 밀봉 연결하여, 작업을 용이하게 하고, 우수한 단열성 및 기밀성을 구비할 수 있는 용접 접합용 2차 방벽을 구비하는 액화천연가스 저장용기용 단열시스템을 제공하는 것이다. The present invention has been made to solve the above problems, the object of the present invention is to provide a secondary barrier for welding joint that can be easily sealed and connected to the secondary barrier by welding, which can provide excellent heat insulation and airtightness. It is to provide a thermal insulation system for liquefied natural gas storage container.

도 1 은 본 발명에 따른 2차방벽의 개략적 구성을 보인 예시도를, 도 2 는 본 발명에 따른 용접형 2차방벽을 적용한 단열시스템의 개략적 구성을 보인 예시도를, 도 3 은 본 발명에 따른 초박판 금속 2차방벽을 적용한 단열시스템의 개략적 구성을 보인 예시도를 도시한 것으로, 본 발명은 상부에 1차 단열판(10)을 구비하고, 하부에 2차 단열판(20)을 구비하며, 상기 2차 단열판의 연결부위 상부에 연결용 단열판(30)이 설치되고, 상기 1차 단열판 및 연결용 단열판의 상부에 1차 방 벽(40)이 설치되며, 상기 1차 단열판과 2차 단열판 사이에 2차 방벽이 위치하는 이중 방벽구조의 액화천연가스 저장용기용 단열시스템에 있어서, 1 is an exemplary view showing a schematic configuration of a secondary barrier according to the present invention, Figure 2 is an exemplary view showing a schematic configuration of an insulation system to which a welded secondary barrier according to the present invention, Figure 3 Exemplary diagram showing a schematic configuration of an insulation system applying the ultra-thin metal secondary barrier according to the present invention, the present invention is provided with a primary insulation plate 10 in the upper portion, and a secondary insulation plate 20 in the lower portion, A connection insulation plate 30 is installed on the connection portion of the secondary insulation plate, a primary barrier 40 is installed on the primary insulation plate and the connection insulation plate, and between the primary insulation plate and the secondary insulation plate. In the insulation system for a LNG storage container having a double barrier structure having a secondary barrier in the

상기 2차 방벽(51,52)은 끝단에 상부방향으로 돌출되어 형성된 금속재질의 접촉대(53)를 구비하고, 일측 2차 방벽의 접촉대에 또다른 2차방벽의 접촉대가 접촉되도록 설치되며, 상기 접촉되는 접촉대를 용접에 의해 밀봉하도록 되어 있다. 즉, 상기 2차 방벽은 접촉되는 접촉대를 용접에 의해 밀봉하도록 되어 있다. The secondary barriers (51, 52) is provided with a contact point 53 made of a metallic material formed to protrude in the upper direction at the end, and is installed so that the contact point of another secondary barrier is in contact with the contact point of one side secondary barrier. The contact table to be contacted is sealed by welding. That is, the said secondary barrier is made to seal the contact stand which contacts by welding.

상기 2차 방벽은 끝단에 상부방향으로 돌출되도록 금속재질의 접촉대가 형성되어 있으며, 도 2 에 도시된 바와 같이, 접촉대를 구비하는 용접형 2차방벽(51) 또는 도 3 에 도시된 바와 같이 접촉대를 구비하는 초박판 금속 2차방벽(52)으로 이루어져 있다.The secondary barrier is formed in the end of the metal contact to protrude upwards, as shown in Figure 2, as shown in Figure 2, welded secondary barrier 51 having a contact or as shown in FIG. It consists of an ultra-thin metal secondary barrier 52 having a contact table.

상기 용접형 2차방벽(51)은 3중 구조로 형성되어 있으며, 끝단에 접촉대(53)를 구비하는 금속 연결부(511)와, 상기 금속 연결부의 상하부면에 일체형으로 부착설치되는 섬유부(512)로 이루어져 있다. 이때, 상기 섬유부(512)는 금속연결부에 형성된 접촉대(53)를 제외한 나머지 부분에 설치되어 있으며, 유리섬유로 이루어져 있다. The welded secondary barrier 51 is formed in a triple structure, the metal connecting portion 511 having a contact table 53 at the end, and the fiber portion integrally attached to the upper and lower surfaces of the metal connecting portion ( 512). At this time, the fiber portion 512 is installed on the remaining portion except for the contact table 53 formed in the metal connecting portion, made of glass fiber.

즉, 상기 용접형 2차방벽(51)은 유리섬유, 금속연결부, 유리섬유의 3중구조로 이루어져 있으며, 중간에 위치한 금속연결부(511)의 끝단에 상부방향으로 돌출되어 접촉대(53)가 형성되고, 상기 금속연결부는 스테인레스강, 알루미늄합금, 인바강 등의 금속재질로 이루어져 있다.That is, the welded secondary barrier 51 has a triple structure of glass fiber, metal connection part, and glass fiber, and protrudes upward at the end of the metal connection part 511 located in the middle to form a contact table 53. The metal connecting portion is made of a metal material such as stainless steel, aluminum alloy, Inva steel.

상기 초박판 금속 2차방벽(52)은 끝단에 상부방향으로 돌출되어 접촉대(53) 가 형성되어 있으며, 1㎜ 이하의 초박판을 구비하고, 스테인레스강, 알루미늄합금, 인바강 등의 금속재질로 이루어져 있다.The ultra-thin metal secondary barrier 52 protrudes upward at an end thereof, and has a contact table 53 formed thereon. The ultra-thin metal secondary barrier 52 has an ultra-thin plate of 1 mm or less, and is made of metal such as stainless steel, aluminum alloy, and Invar steel. Consists of

상기 2차 방벽은 1㎜ 를 초과 할 경우, 이 이상의 두께에서는 자체 강성에 의하여 취급이 어렵고 저항용접이 어려워지게 되며, 또한, 2차 방벽은 1차 방벽 파괴후 약 8일동안 선체 내벽을 보호할 수 있어야 하므로, 상기 금속제 초박판 2차방벽은 두께를 1㎜ 이하로 한정할 필요성이 있다.If the secondary barrier exceeds 1mm, it is difficult to handle and difficult to weld due to its rigidity at the thickness of more than this thickness, and the secondary barrier is to protect the hull inner wall for about 8 days after the primary barrier is destroyed. Since it should be possible, the ultrathin metal secondary barrier needs to limit its thickness to 1 mm or less.

상기와 같이 용접형 2차방벽(51) 및 초박판 금속 2차방벽(52)에 형성된 접촉대(53)는 2차 방벽의 설치시, 이웃하는 또다른 접촉대에 용접에 의해 밀봉되며, 상기 용접부위(60)는 연결용 단열판(30) 하단에 형성된 홈(31)내로 위치하게 된다. The contact table 53 formed on the welded secondary barrier 51 and the ultrathin metal secondary barrier 52 as described above is sealed by welding to another neighboring contact zone when the secondary barrier is installed. The welding part 60 is positioned in the groove 31 formed at the lower end of the heat insulating plate 30 for connection.

상기와 같이 구성된 본 발명은 2차 단열판을 연속적으로 배치하여 2차 단열층을 형성하고, 상기 2차 단열층의 상부에 용접형 2차방벽(또는 초박판 금속 2차방벽)을 접촉대가 서로 접촉되도록 설치하고, 상기 접촉되는 접촉대를 용접에 의해 접합하면 된다.According to the present invention configured as described above, secondary insulation plates are continuously arranged to form a secondary insulation layer, and a welding type secondary barrier (or an ultra-thin metal secondary barrier) is installed on the upper portion of the secondary insulation layer so that the contact table is in contact with each other. What is necessary is just to join the contact stand to contact by welding.

본 발명은 상술한 특정의 바람직한 실시예에 한정되지 아니하며, 청구범위에서 청구하는 본 발명의 요지를 벗어남이 없이 당해 발명이 속하는 기술분야에서 통상의 지식을 가진 자라면 누구든지 다양한 변형실시가 가능한 것은 물론이고, 그와 같은 변경은 청구범위 기재의 범위내에 있게 된다.The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

이와 같이 본 발명은 2차 방벽을 용접에 의해 밀봉하도록 되어 있어, 접합부의 기밀성 즉, 극저온 액화가스의 누출방지성을 획기적으로 개선할 수 있으며, 작업성을 향상시킬 수 있는 등 많은 효과가 있다.As described above, the present invention is designed to seal the secondary barrier by welding, thereby significantly improving the airtightness of the joint, that is, preventing leakage of cryogenic liquefied gas, and improving workability.

Claims (3)

상부에 1차 단열판을 구비하고, 하부에 2차 단열판을 구비하며, 상기 2차 단열판의 연결부위 상부에 연결용 단열판이 설치되고, 상기 1차 단열판 및 연결용 단열판의 상부에 1차 방벽이 설치되며, 상기 1차 단열판과 2차 단열판 사이에 2차 방벽이 위치하는 이중 방벽구조의 액화천연가스 저장용기용 단열시스템에 있어서, It is provided with a primary insulation plate in the upper portion, a secondary insulation plate in the lower portion, a connection insulation plate is installed in the upper portion of the connection portion of the secondary insulation plate, a primary barrier is installed in the upper portion of the primary insulation plate and the connection insulation plate. In the insulation system for the LNG storage container of a double barrier structure in which the secondary barrier is located between the primary insulation plate and the secondary insulation plate, 상기 2차 방벽은 끝단에 상부방향으로 돌출되어 형성된 금속재질의 접촉대를 구비하고, 일측 2차 방벽의 접촉대에 또다른 2차방벽의 접촉대가 접촉되도록 설치되며, 접촉되는 접촉대가 용접에 의해 밀봉되고, 상기 용접된 접촉대는 연결용 단열판 하단에 형성된 홈내에 위치하도록 구성되는 것을 특징으로 하는 용접 접합용 2차 방벽을 구비하는 액화천연가스 저장용기용 단열시스템.The secondary barrier is provided with a contact point made of a metal material protruding upward at the end, and is installed such that the contact point of another secondary barrier contacts the contact point of one side secondary barrier, and the contact point is contacted by welding. Sealed, the welded contact is insulated system for a LNG storage vessel having a secondary barrier for welding welding, characterized in that it is configured to be located in the groove formed at the bottom of the connecting insulation plate. 제 1 항에 있어서;The method of claim 1; 상기 2차 방벽은 끝단에 상부방향으로 돌출되도록 금속재질의 접촉대를 구비하는 용접형 2차방벽 또는 끝단에 상부방향으로 돌출되도록 접촉대가 형성된 초박판 금속 2차방벽인 것을 특징으로 하는 용접 접합용 2차 방벽을 구비하는 액화천연가스 저장용기용 단열시스템.The secondary barrier is a welding-type secondary barrier having a contact stand made of a metallic material so as to protrude upwards at the end or an ultra-thin metal secondary barrier having a contact bar formed to protrude upward at the end. Insulation system for LNG storage containers with a secondary barrier. 제 2 항에 있어서;The method of claim 2; 상기 초박판 금속 2차방벽은 1㎜ 이하의 초박판 금속재질인 것을 특징으로 하는 용접 접합용 2차 방벽을 구비하는 액화천연가스 저장용기용 단열시스템.The ultra-thin metal secondary barrier is a thermal insulation system for a LNG storage container having a secondary barrier for welding welding, characterized in that the ultra-thin metal material of 1mm or less.
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