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WO2017014426A1 - Fixation apparatus of liquefied natural gas storage tank - Google Patents

Fixation apparatus of liquefied natural gas storage tank Download PDF

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Publication number
WO2017014426A1
WO2017014426A1 PCT/KR2016/005968 KR2016005968W WO2017014426A1 WO 2017014426 A1 WO2017014426 A1 WO 2017014426A1 KR 2016005968 W KR2016005968 W KR 2016005968W WO 2017014426 A1 WO2017014426 A1 WO 2017014426A1
Authority
WO
WIPO (PCT)
Prior art keywords
fixing device
wall
insulation wall
primary
storage tank
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/KR2016/005968
Other languages
French (fr)
Korean (ko)
Inventor
강봉호
박광준
표창민
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hanwha Ocean Co Ltd
Original Assignee
Daewoo Shipbuilding and Marine Engineering Co Ltd
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 Daewoo Shipbuilding and Marine Engineering Co Ltd filed Critical Daewoo Shipbuilding and Marine Engineering Co Ltd
Publication of WO2017014426A1 publication Critical patent/WO2017014426A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • F17C3/00—Vessels not under pressure
    • F17C3/02—Vessels not under pressure with provision for thermal insulation

Definitions

  • the present invention relates to a fixing device for a liquefied natural gas storage tank, and more particularly, an insulating wall fixing device for fixing a primary insulating wall and a secondary insulating wall, and an installation of an insulating wall fixing device on an upper portion of the insulating wall fixing device. It relates to a fixed device of a liquefied natural gas storage tank including an insulating plug provided to insulate the space generated by the.
  • 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 spotlighted as a low pollution energy source in various technical fields.
  • Natural gas is transported in a gaseous state through onshore or offshore gas piping, or to a distant consumer while stored in an LNG carrier in the form of liquefied liquefied natural gas (LNG).
  • Liquefied natural gas is obtained by cooling natural gas to cryogenic temperature (below -163 °C or less), and its volume is reduced to about 1/600 than natural gas in gas state, so it is very suitable for long distance transportation over sea.
  • Liquefied natural gas carriers are provided with storage tanks (also called cargo holds) for storing and storing liquefied natural gas cooled by liquefying natural gas.
  • the boiling point of liquefied natural gas is about -162 °C at atmospheric pressure, so the storage tank of liquefied natural gas is a material that can withstand ultra low temperatures such as aluminum steel, stainless steel, and 35% nickel steel to store and store liquefied natural gas safely. It can be manufactured, designed to be resistant to thermal stress and heat shrinkage, and to prevent heat ingress.
  • LNG transporter for loading and unloading LNG to land demand by loading sea
  • LNG ReVification Vessel which reloads LNG after recharging stored LNG after arriving at land demand by loading sea, recently unloading LNG
  • floating offshore structures such as LNG Floating, Production, Storage and Offloading (FPSO) or LNG Floating Storage and Regasification Unit (FSRU) are also equipped with storage tanks installed on LNG carriers or LNG RVs.
  • FPSO LNG Floating, Production, Storage and Offloading
  • FSRU LNG Floating Storage and Regasification Unit
  • These storage tanks can be classified into independent type and membrane type according to whether the load of the cargo directly acts on the insulation.
  • Membrane type storage tanks are typical of GTT NO 96 type and TGZ Mark III type, and standalone storage tanks include MOSS type and IHI-SPB type.
  • Membrane-type storage tanks in LNG carriers, etc. are equipped with an insulating structure to maintain the insulation while distributing the load of liquefied natural gas.
  • Such an insulation structure includes a sealing wall that is in contact with the liquefied natural gas, and an insulation panel made of top plywood, bottom plywood, polyurethane foam (RPUF) and the like for insulation to the outside of the sealing wall.
  • the overall structure of the insulation panels is sandwiched with polyurethane foam bonded between the plywood panels.
  • the insulation panel is composed of an upper panel (primary insulation wall) that is in contact with a sealing wall containing liquefied natural gas and a lower panel (second insulation wall) provided outside the upper panel, and is fixed by a fixing device between layers of insulation panels. do. In order to install the fixing device, an installation space is required. Since there is no insulation panel in the space part, maintaining the insulation of the cargo hold may be a problem.
  • the present invention can be stably fixed between the primary and secondary insulating walls, while maintaining the thermal insulation of the liquefied natural gas storage tank in the installation space portion of the fixing device to ensure the safety of ships, installation work
  • the primary sealing wall for liquid-tightening the liquefied natural gas while in contact with the liquefied natural gas;
  • a primary heat insulation wall provided outside the primary sealing wall;
  • a secondary heat insulating wall provided on an outer side of the primary heat insulating wall.
  • the fixing device provided in a liquefied natural gas storage tank comprising: a heat insulating wall fixing device to fix the primary heat insulating wall and the secondary heat insulating wall. ; And a heat insulation plug provided to insulate a space generated by the installation of the heat insulation wall fixing device on the top of the heat insulation wall fixing device.
  • the insulating plug, the upper and lower plates made of plywood, the insulating material provided between the upper and lower plates, and the lower cap is provided to be fastened to the lower end of the lower plate and coupled to the insulating wall fixing device
  • a heat insulation plug may have a cylindrical shape in which a head is provided by the upper plate having a larger cross-sectional diameter than the cross-sectional diameter of the lower cap, the lower plate, and the heat insulating material.
  • a plurality of holes may be provided on the top surface of the head by the upper plate.
  • the top surface of the head by the upper plate may be provided with a cross-shaped groove that can provide a gas circulation path when purging the storage tank.
  • the lower cap part includes a cap part fastened to the lower end of the lower plate, and a flange part radially extending from the lower end of the cap part and coupled to the heat insulation wall fixing device, wherein the lower plate has a hole in the center thereof. It is formed, it can be fastened by inserting the cap portion of the lower cap portion in the hole.
  • the heat insulation wall fixing device includes a stud bolt fixed to the secondary heat insulation wall and a nut fastened to the stud bolt, and the through hole is formed in the primary heat insulation wall, and the stud bolt is
  • the first heat insulating wall may be fixed to the secondary heat insulating wall by the heat insulating wall fixing device after being inserted into the through hole and fastened with the nut.
  • the insulation wall fixing device further includes a special washer inserted between the lower plate of the primary insulation wall and the nut to prevent the insulation wall fixing device from being separated even when the lower plate of the primary insulation wall shrinks. Can be.
  • the insulation wall fixing device may further include a spring washer inserted between the special washer and the nut to prevent the nut from loosening when the lower plate of the primary insulation wall shrinks in the height direction.
  • the upper plate of the secondary insulating wall is provided with a strip of metal material, the stud bolt may be fixed to the strip.
  • the insulating wall fixing device may further include a spacer provided to surround the outer surface of the nut to distribute the load of the liquefied natural gas.
  • a screw thread is formed inside the cap part of the lower cap part, and the screw thread is fastened to an upper portion of the stud bolt, so that the heat insulating plug can be coupled to the heat insulating wall fixing device.
  • Fixing device of the present invention by installing the insulation plug by bolting (bolting), it is easy to install the plug, can reduce the working time, there is a strong holding force is stable advantage.
  • Figure 1 schematically shows a cross-sectional view in which the primary and secondary insulation walls are fixed by the fixing device of the liquefied natural gas storage tank according to an embodiment of the present invention.
  • Figure 2 schematically shows the structure of the insulating plug of the fixing device according to the first embodiment of the present invention.
  • Figure 3 schematically shows the structure of the insulating plug of the fixing device according to a second embodiment of the present invention.
  • Figure 1 schematically shows a cross-sectional view in which the primary and secondary insulating wall is fixed by the fixing device of the liquefied natural gas storage tank according to an embodiment of the present invention
  • Figure 2 is a first embodiment of the present invention
  • the structure of the insulating plug of the fixing device according to
  • Figure 3 schematically shows the structure of the insulating plug of the fixing device according to a second embodiment of the present invention.
  • the cargo hold in which the liquefied natural gas is stored is provided with an insulating structure to block heat entry.
  • a double insulation wall may be provided to block heat entry and exit between the hull inner wall, and an insulation structure may be provided to provide a gastight barrier between the upper portion of the insulation wall and the insulation wall.
  • the storage tank provided with the fixing device of the present embodiment, the primary sealing wall 10 for sealing the liquefied natural gas while contacting the liquefied natural gas, and the primary thermal insulation provided on the outer side of the primary sealing wall 10 And a secondary heat insulating wall 30 provided outside the wall 20 and the primary heat insulating wall 20.
  • the primary sealing wall 10 is installed above the primary insulating wall 20 and liquid-tightens the liquefied natural gas (LNG) stored in the storage tank while being in contact with the liquefied natural gas, and the primary insulating wall 20 and the secondary insulation
  • a second sealing wall (not shown) may be provided between the walls 30 to seal the liquefied natural gas from the primary sealing wall 10.
  • Wrinkle structures may be formed in the primary sealing wall 10 and the secondary sealing wall to prevent breakage during shrinkage and stretching due to temperature changes.
  • the corrugated structure can be prevented from being damaged due to thermal deformation applied to the primary sealing wall 10 and the secondary sealing wall by being stretched or shrunk by the temperature change according to the loading of the liquefied natural gas.
  • Each of the primary and secondary insulation walls 20 and 30 includes upper and lower plates and insulation provided between the upper and lower plates, and the upper and lower plates are made of plywood, and the insulation is made of poly It may be provided with a polyurethane foam (Polyurethane Foam).
  • a strip (not shown) of a metal material may be provided on the upper surface of the primary insulating wall 20, and the primary sealing wall 10 may be welded on the strip.
  • the fixing device of the present embodiment is provided to maintain liquid tightness and heat insulation while fixing between the primary and secondary heat insulating walls 30.
  • the fixing device includes an insulating wall fixing device 100 for fixing the primary insulating wall 20 and the secondary insulating wall 30, and an upper portion of the insulating wall fixing device 100. It is configured to include a heat insulation plug 200 is provided to insulate the space generated by the installation of the heat insulation wall fixing device 100.
  • the insulation wall fixing device 100 wraps the stud bolt 110 fixedly coupled to the secondary insulation wall 30, the nut 120 fastened to the stud bolt 110, and an outer surface of the nut 120. It is provided so as to include a spacer 150 for dispersing the load of the liquefied natural gas.
  • the heat insulation wall fixing device 100 is inserted between the lower plate of the primary heat insulation wall 20 and the nut 120 so that the insulation wall fixing device 100 does not detach even when the bottom plate of the primary heat insulation wall 20 shrinks.
  • a special washer 130 to be inserted between the special washer 130 and the nut 120 to prevent the nut 120 from loosening when the lower plate of the primary insulation wall 20 shrinks in the height direction.
  • the spring washer 140 may further include.
  • a strip 40 of metal material is installed on the top plate of the secondary insulating wall 30, and the stud bolt 110 is fixed to the strip 40.
  • the inside of the strip 40 and the stud bolt are installed.
  • the lower part of the 110 is provided with a threaded female thread and a male thread structure, and when the stud bolt 110 is engaged with the inner side of the strip 40, the stud bolt 110 may be fastened and fixed to the strip 40.
  • the special washer 130 serves to prevent the insulation from the insulation wall fixing device 100 even if the lower plate of the primary insulation wall 20 shrinks.
  • the special washer 130 has a diameter larger than the diameter of the nut 120, so as to secure a wide area in which the lower plate of the primary insulation wall 20 can slide.
  • the spacer 150 may be fitted, and the spacer 150 may have a donut-shaped structure to cover the side surface of the nut 120, and may be made of plywood. have.
  • the spacer 150 may distribute the load of the liquefied natural gas to protect the stud bolt 110 and the nut 120.
  • the lower plate of the primary insulation wall 20 forms a structure that can slide between the secondary sealing wall and the special washer 130, the primary insulation wall 20 ) Can minimize the thermal stress by sliding horizontally during heat shrinkage.
  • a hole that is, a through hole is formed in the upper portion of the second heat insulation wall 30 and the primary heat insulation wall 20.
  • the hole is closed by the insulating plug 200, and after inserting the spacer 150 of the insulating wall fixing device, the insulating plug 200 is inserted into the through hole and fixed.
  • the thermal insulation plug 200 is fitted to the upper and lower plates 210 and 230 made of plywood, the thermal insulation material 220 provided between the upper and lower plates 210 and 230, and the lower end of the lower plate 230. It is fastened and includes a lower cap 240 is coupled to the insulating wall fixing device (100).
  • the upper and lower plates 210 and 230 may be made of plywood, and the insulation may be polyurethane foam.
  • the heat insulation plug 200 has a head 200H by the upper plate 210 having a larger cross-sectional diameter than the cross-sectional diameter of the lower cap portion 240, the lower plate 230, and the heat insulating material 220. ) May be provided in a cylindrical shape.
  • the primary heat insulation wall 20 is formed such that the head 200H of the insulation plug is placed on the upper plate of the primary insulation wall 20 after the insulation plug 200 is inserted into the through hole. Can be processed.
  • the lower cap part 240 includes a cap part 241 fastened to the lower end of the insulating plug lower plate 230, and a flange part 242 extending radially from the lower end of the cap part 241 and coupled to the insulating wall fixing device 100. ).
  • the heat insulation plug lower plate 230 has a hole formed in the center thereof, and the cap portion 241 of the lower cap portion is inserted into the hole, and the lower plate 230 and the lower cap portion 240 are fastened.
  • a thread is formed inside the cap 241 of the lower cap part, and the thread is fastened to the upper part of the stud bolt 110 by bolting, so that the insulating plug 200 may be coupled to the insulating wall fixing device 100. have.
  • the device of the present embodiment is fastened by bolting the component parts processed with the thread shape, so that the work is easy and the working time can be shortened.
  • there is no need to use an adhesive even if there is a temperature change, the structure has a strong holding force, and structurally, there is an advantage of high stability.
  • the first embodiment is to provide a plurality of holes H in the upper end surface of the head by the upper plate 210 of the insulating plug 200A.
  • the bottom surface of the insulation plug 200 that is, the inner side of the lower cap portion 240 of the insulation plug is formed with a thread that can be coupled with the stud bolt 110 of the insulation wall fixing device, the insulation plug 200 )
  • the insulation wall fixing device 100 is bolted (bolting), by providing a plurality of holes (H) in the upper surface of the top plate 210 head of the insulation plug can be made smoothly bolting operation work efficiency and Productivity can be increased.
  • the equipment can be easily bolted by inserting the equipment into the hole H provided on the top surface of the head, a separate space for the bolting operation is not required between the insulation plug upper plate 210 and the through hole of the primary insulation wall 20. . Therefore, the insulating plug upper plate 210 is processed in accordance with the through-hole, thereby increasing the heat insulating property, and the insulating plug 200 can be engaged with the through-hole without any remaining or floating space, thereby being structurally stable.
  • the second embodiment provides a dozen-shaped groove C on the top surface of the head of the upper plate 210 of the insulating plug 200B.
  • a cross-shaped groove as in the above-described first embodiment, it is possible to increase work efficiency when installing the insulation wall fixing device 100 and the insulation plug 200.
  • cross-shaped groove C crossing the upper surface of the upper plate 210 provides a path through which gas can circulate when purging the storage tank using nitrogen gas after installing the storage tank. There is also an effect that can be done.

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

Abstract

A fixation apparatus of a liquefied natural gas storage tank is disclosed. A fixation apparatus of a liquefied natural gas storage tank of the present invention comprises: a primary sealing wall which contacts a liquefied natural gas and seals the liquefied natural gas in a liquid-tight manner; a primary insulation wall provided on the outer side of the primary sealing wall; and a secondary insulation wall provided on the outer side of the primary insulation wall, wherein the fixation apparatus of a liquefied natural gas storage tank comprises: an insulation wall fixation apparatus for fixing the primary insulation wall and the secondary insulation wall; and an insulation plug which is provided so as to insulate a space generated in the upper portion of the insulation wall fixation apparatus due to the installation thereof.

Description

액화천연가스 저장탱크의 고정장치Fixing device of LNG storage tank

본 발명은 액화천연가스 저장탱크의 고정장치에 관한 것으로, 더욱 상세하게는 1차 단열벽과 2차 단열벽을 고정시키는 단열벽 고정장치와, 단열벽 고정장치의 상부에서 단열벽 고정장치의 설치로 발생하는 공간을 단열하도록 마련되는 단열 플러그를 포함하는 액화천연가스 저장탱크의 고정장치에 관한 것이다. The present invention relates to a fixing device for a liquefied natural gas storage tank, and more particularly, an insulating wall fixing device for fixing a primary insulating wall and a secondary insulating wall, and an installation of an insulating wall fixing device on an upper portion of the insulating wall fixing device. It relates to a fixed device of a liquefied natural gas storage tank including an insulating plug provided to insulate the space generated by the.

천연가스(natural gas)는 메탄(methane)을 주성분으로 하고, 소량의 에탄(ethane), 프로판(propane) 등을 포함하는 화석연료로서, 최근 다양한 기술 분야에서 저공해 에너지원으로서 각광받고 있다.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 spotlighted as a low pollution energy source in various technical fields.

천연가스는, 육상 또는 해상의 가스배관을 통해 가스 상태로 운반되거나, 또는 액화된 액화천연가스(LNG)의 상태로 LNG 수송선에 저장된 채 원거리의 소비처로 운반된다. 액화천연가스는 천연가스를 극저온(대략 -163℃ 이하)으로 냉각하여 얻어지는 것으로 가스 상태의 천연가스일 때보다 그 부피가 대략 1/600로 줄어들므로 해상을 통한 원거리 운반에 매우 적합하다.Natural gas is transported in a gaseous state through onshore or offshore gas piping, or to a distant consumer while stored in an LNG carrier in the form of liquefied liquefied natural gas (LNG). Liquefied natural gas is obtained by cooling natural gas to cryogenic temperature (below -163 ℃ or less), and its volume is reduced to about 1/600 than natural gas in gas state, so it is very suitable for long distance transportation over sea.

액화천연가스 운반선에는 천연가스를 냉각하여 액화시킨 액화천연가스를 보관 및 저장할 수 있는 저장탱크(cargo, 화물창이라고도 함)가 구비된다. 액화천연가스의 끓는점은 대기압에서 약 -162℃ 정도이므로, 액화천연가스의 저장탱크는 액화천연가스를 안전하게 보관하고 저장하기 위해 알루미늄강, 스테인리스강, 35% 니켈강 등과 같은 초저온에 견딜 수 있는 재료로 제작될 수 있으며, 열 응력 및 열 수축에 강인하고, 열 침입을 막을 수 있는 구조로 설계된다.Liquefied natural gas carriers are provided with storage tanks (also called cargo holds) for storing and storing liquefied natural gas cooled by liquefying natural gas. The boiling point of liquefied natural gas is about -162 ℃ at atmospheric pressure, so the storage tank of liquefied natural gas is a material that can withstand ultra low temperatures such as aluminum steel, stainless steel, and 35% nickel steel to store and store liquefied natural gas safely. It can be manufactured, designed to be resistant to thermal stress and heat shrinkage, and to prevent heat ingress.

LNG를 싣고 바다를 운항하여 육상 수요처에 LNG를 하역하기 위한 LNG 수송선, LNG를 싣고 바다를 운항하여 육상 수요처에 도착한 후 저장된 LNG를 재기화하여 천연가스 상태로 하역하는 LNG RV(Regasification Vessel), 최근에는 LNG FPSO(Floating, Production, Storage and Offloading)나 LNG FSRU(Floating Storage and Regasification Unit)와 같은 부유식 해상 구조물에도 LNG 수송선이나 LNG RV에 설치되는 저장탱크가 설치되어 있다. LNG transporter for loading and unloading LNG to land demand by loading sea, LNG ReVification Vessel (RV), which reloads LNG after recharging stored LNG after arriving at land demand by loading sea, recently unloading LNG In addition, floating offshore structures such as LNG Floating, Production, Storage and Offloading (FPSO) or LNG Floating Storage and Regasification Unit (FSRU) are also equipped with storage tanks installed on LNG carriers or LNG RVs.

이러한 저장탱크는 단열재에 화물의 하중이 직접적으로 작용하는지 여부에 따라 독립형(Independent Type)과 멤브레인형(Membrane Type)으로 분류할 수 있다. 멤브레인형 저장탱크는 대표적으로 GTT NO 96형과 TGZ Mark Ⅲ형이 있으며, 독립형 저장탱크는 MOSS형과 IHI-SPB형을 포함한다.These storage tanks can be classified into independent type and membrane type according to whether the load of the cargo directly acts on the insulation. Membrane type storage tanks are typical of GTT NO 96 type and TGZ Mark III type, and standalone storage tanks include MOSS type and IHI-SPB type.

LNG 운반선 등에서 멤브레인형 저장탱크는 액화천연가스의 하중을 분산시키면서 단열성을 유지하기 위한 단열구조를 갖추게 된다. 이러한 단열구조는 개략적으로 액화천연가스와 접하는 밀봉벽과, 밀봉벽의 외측으로 단열을 위하여 Top plywood, Bottom plywood, 폴리우레탄폼(RPUF) 등으로 이루어진 단열패널이 포함된다. 단열패널의 전체적인 구조는 플라이우드 패널 사이에 폴리우레탄폼이 접합된 샌드위치 형태이다.Membrane-type storage tanks in LNG carriers, etc. are equipped with an insulating structure to maintain the insulation while distributing the load of liquefied natural gas. Such an insulation structure includes a sealing wall that is in contact with the liquefied natural gas, and an insulation panel made of top plywood, bottom plywood, polyurethane foam (RPUF) and the like for insulation to the outside of the sealing wall. The overall structure of the insulation panels is sandwiched with polyurethane foam bonded between the plywood panels.

단열 패널은 액화천연가스가 수용된 밀봉벽에 접하는 상부 패널(1차 단열벽)과, 상부 패널 외측에 마련되는 하부 패널(2차 단열벽)로 구성되며, 층을 이루는 단열패널 간에는 고정 장치로 고정된다. 이러한 고정 장치가 설치되기 위해서는 설치공간이 필요한데, 이 공간 부분에는 단열패널이 없으므로 화물창의 단열성 유지가 문제될 수 있다. The insulation panel is composed of an upper panel (primary insulation wall) that is in contact with a sealing wall containing liquefied natural gas and a lower panel (second insulation wall) provided outside the upper panel, and is fixed by a fixing device between layers of insulation panels. do. In order to install the fixing device, an installation space is required. Since there is no insulation panel in the space part, maintaining the insulation of the cargo hold may be a problem.

본 발명은 이러한 1차 및 2차 단열벽 사이를 안정적으로 고정할 수 있으면서도, 고정 장치의 설치공간 부분에서 액화천연가스 저장탱크의 단열성을 유지하여 선박 등의 안전성을 확보할 수 있도록 하고, 설치 작업의 용이성 및 제작성을 향상시키고 제작 비용을 줄일 수 있는 고정장치를 제안하고자 한다. The present invention can be stably fixed between the primary and secondary insulating walls, while maintaining the thermal insulation of the liquefied natural gas storage tank in the installation space portion of the fixing device to ensure the safety of ships, installation work We propose a fixture that can improve the ease and manufacturability and reduce the manufacturing cost.

상기 과제를 해결하기 위한 본 발명의 일 측면에 따르면, 액화천연가스와 접하면서 상기 액화천연가스를 액밀하는 1차 밀봉벽; 상기 1차 밀봉벽의 외측에 마련되는 1차 단열벽; 및 상기 1차 단열벽의 외측에 마련되는 2차 단열벽;을 포함하는 액화천연가스 저장탱크에 마련되는 고정장치에 있어서, 상기 1차 단열벽과 상기 2차 단열벽을 고정시키는 단열벽 고정장치; 및 상기 단열벽 고정장치의 상부에서 상기 단열벽 고정장치의 설치로 발생하는 공간을 단열하도록 마련되는 단열 플러그;를 포함하는 액화천연가스 저장탱크의 고정장치가 제공된다. According to an aspect of the present invention for solving the above problems, the primary sealing wall for liquid-tightening the liquefied natural gas while in contact with the liquefied natural gas; A primary heat insulation wall provided outside the primary sealing wall; And a secondary heat insulating wall provided on an outer side of the primary heat insulating wall. The fixing device provided in a liquefied natural gas storage tank comprising: a heat insulating wall fixing device to fix the primary heat insulating wall and the secondary heat insulating wall. ; And a heat insulation plug provided to insulate a space generated by the installation of the heat insulation wall fixing device on the top of the heat insulation wall fixing device.

바람직하게는 상기 단열 플러그는, 플라이우드로 이루어지는 상부 및 하부 판과, 상기 상부 및 하부 판 사이에 마련되는 단열재와, 상기 하부 판의 하단에 체결되도록 마련되며 상기 단열벽 고정장치에 결합되는 하부 캡부를 포함하며, 상기 단열 플러그는 상기 하부 캡, 하부 판 및 단열재의 단면 지름보다, 단면 지름이 큰 상기 상부 판에 의해 헤드가 마련되는 원기둥 형상일 수 있다.Preferably, the insulating plug, the upper and lower plates made of plywood, the insulating material provided between the upper and lower plates, and the lower cap is provided to be fastened to the lower end of the lower plate and coupled to the insulating wall fixing device And a heat insulation plug may have a cylindrical shape in which a head is provided by the upper plate having a larger cross-sectional diameter than the cross-sectional diameter of the lower cap, the lower plate, and the heat insulating material.

바람직하게는, 상기 상부 판에 의한 헤드의 상단면에는 복수의 홀이 마련될 수 있다. Preferably, a plurality of holes may be provided on the top surface of the head by the upper plate.

바람직하게는, 상기 상부 판에 의한 헤드의 상단면에는 저장탱크의 퍼징(Purging) 시 가스의 순환 경로를 제공할 수 있는 십자형의 홈이 마련될 수 있다. Preferably, the top surface of the head by the upper plate may be provided with a cross-shaped groove that can provide a gas circulation path when purging the storage tank.

바람직하게는 상기 하부 캡부는, 상기 하부 판의 하단에 체결되는 캡부와, 상기 캡부의 하단에서 방사형으로 연장되며 상기 단열벽 고정장치에 결합되는 플랜지부를 포함하며, 상기 하부 판은 중심부에 구멍이 형성되어, 상기 구멍에 하부 캡부의 캡부가 삽입되어 체결될 수 있다.Preferably, the lower cap part includes a cap part fastened to the lower end of the lower plate, and a flange part radially extending from the lower end of the cap part and coupled to the heat insulation wall fixing device, wherein the lower plate has a hole in the center thereof. It is formed, it can be fastened by inserting the cap portion of the lower cap portion in the hole.

바람직하게는 상기 단열벽 고정장치는, 상기 2차 단열벽에 고정 결합되는 스터드 볼트와, 상기 스터드 볼트에 체결되는 너트를 포함하고, 상기 1차 단열벽에는 관통구멍이 형성되고, 상기 스터드 볼트가 상기 관통구멍에 삽입된 후 상기 너트와 체결되어, 상기 단열벽 고정장치에 의해 상기 1차 단열벽이 상기 2차 단열벽에 고정될 수 있다. Preferably, the heat insulation wall fixing device includes a stud bolt fixed to the secondary heat insulation wall and a nut fastened to the stud bolt, and the through hole is formed in the primary heat insulation wall, and the stud bolt is The first heat insulating wall may be fixed to the secondary heat insulating wall by the heat insulating wall fixing device after being inserted into the through hole and fastened with the nut.

바람직하게는 상기 단열벽 고정장치는, 상기 1차 단열벽의 하부판과 상기 너트 사이에 삽입되어 상기 1차 단열벽의 하부판이 수축해도 상기 단열벽 고정장치가 이탈되지 않도록 하는 스페셜 와셔를 더 포함할 수 있다. Preferably, the insulation wall fixing device further includes a special washer inserted between the lower plate of the primary insulation wall and the nut to prevent the insulation wall fixing device from being separated even when the lower plate of the primary insulation wall shrinks. Can be.

바람직하게는 상기 단열벽 고정장치는, 상기 스페셜 와셔와 상기 너트 사이에 삽입되어 상기 1차 단열벽의 하부판이 높이 방향으로 수축하는 경우 상기 너트가 풀리는 것을 방지하는 스프링 와셔를 더 포함할 수 있다. Preferably, the insulation wall fixing device may further include a spring washer inserted between the special washer and the nut to prevent the nut from loosening when the lower plate of the primary insulation wall shrinks in the height direction.

바람직하게는, 상기 2차 단열벽의 상부판에는 금속 소재의 스트립이 설치되고, 상기 스터드 볼트는 상기 스트립에 고정될 수 있다. Preferably, the upper plate of the secondary insulating wall is provided with a strip of metal material, the stud bolt may be fixed to the strip.

바람직하게는 상기 단열벽 고정장치는, 상기 너트의 외측면을 감싸도록 마련되어 상기 액화천연가스의 하중을 분산시키는 스페이서를 더 포함할 수 있다. Preferably, the insulating wall fixing device may further include a spacer provided to surround the outer surface of the nut to distribute the load of the liquefied natural gas.

바람직하게는, 상기 하부 캡부 중 캡부의 내측에는 나사산이 형성되며, 상기 나사산이 상기 스터드 볼트의 상부에 체결되어, 상기 단열 플러그가 상기 단열벽 고정장치에 결합될 수 있다. Preferably, a screw thread is formed inside the cap part of the lower cap part, and the screw thread is fastened to an upper portion of the stud bolt, so that the heat insulating plug can be coupled to the heat insulating wall fixing device.

본 발명의 고정장치는 단열 플러그를 볼팅(bolting)으로 설치함으로써, 플러그 설치 작업이 용이하고 작업 시간을 줄일 수 있고, 유지력도 강하여 안정적인 장점이 있다.Fixing device of the present invention by installing the insulation plug by bolting (bolting), it is easy to install the plug, can reduce the working time, there is a strong holding force is stable advantage.

도 1은 본 발명의 일 실시예에 따른 액화천연가스 저장탱크의 고정장치에 의해 1차 및 2차 단열벽이 고정된 단면모습을 개략적으로 도시한다. Figure 1 schematically shows a cross-sectional view in which the primary and secondary insulation walls are fixed by the fixing device of the liquefied natural gas storage tank according to an embodiment of the present invention.

도 2는 본 발명의 제1 실시예에 따른 고정장치 중 단열 플러그의 구조를 개략적으로 도시한다. Figure 2 schematically shows the structure of the insulating plug of the fixing device according to the first embodiment of the present invention.

도 3은 본 발명의 제2 실시예에 따른 고정장치 중 단열 플러그의 구조를 개략적으로 도시한다. Figure 3 schematically shows the structure of the insulating plug of the fixing device according to a second embodiment of the present invention.

본 발명과 본 발명의 동작상의 이점 및 본 발명의 실시에 의하여 달성되는 목적을 충분히 이해하기 위해서는 본 발명의 바람직한 실시 예를 예시하는 첨부 도면 및 첨부 도면에 기재된 내용을 참조하여야만 한다.In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings which illustrate preferred embodiments of the present invention and the contents described in the accompanying drawings.

이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시 예를 설명함으로써, 본 발명을 상세히 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1에는 본 발명의 일 실시예에 따른 액화천연가스 저장탱크의 고정장치에 의해 1차 및 2차 단열벽이 고정된 단면모습을 개략적으로 도시하였고, 도 2에는 본 발명의 제1 실시예에 따른 고정장치 중 단열 플러그의 구조를, 도 3에는 본 발명의 제2 실시예에 따른 고정장치 중 단열 플러그의 구조를 각각 개략적으로 도시하였다. Figure 1 schematically shows a cross-sectional view in which the primary and secondary insulating wall is fixed by the fixing device of the liquefied natural gas storage tank according to an embodiment of the present invention, Figure 2 is a first embodiment of the present invention The structure of the insulating plug of the fixing device according to, Figure 3 schematically shows the structure of the insulating plug of the fixing device according to a second embodiment of the present invention.

액화천연가스는 약 -163℃의 극저온이므로, 액화천연가스가 저장되는 화물창에는 열 출입을 차단하기 위하여 단열 구조를 구비한다. 멤브레인형 저장탱크의 경우 선체 내벽과의 사이에 열 출입을 차단할 수 있도록 이중의 단열벽을 갖추고, 단열벽의 상부 및 단열벽의 사이에는 기밀성을 지닌 방벽을 마련하는 단열 구조를 갖출 수 있다. Since the liquefied natural gas is a cryogenic temperature of about -163 ℃, the cargo hold in which the liquefied natural gas is stored is provided with an insulating structure to block heat entry. In the case of the membrane type storage tank, a double insulation wall may be provided to block heat entry and exit between the hull inner wall, and an insulation structure may be provided to provide a gastight barrier between the upper portion of the insulation wall and the insulation wall.

즉, 본 실시예의 고정장치가 마련되는 저장탱크는, 액화천연가스와 접하면서 액화천연가스를 액밀하는 1차 밀봉벽(10)과, 1차 밀봉벽(10)의 외측에 마련되는 1차 단열벽(20) 및 1차 단열벽(20)의 외측에 마련되는 2차 단열벽(30)을 포함한다. That is, the storage tank provided with the fixing device of the present embodiment, the primary sealing wall 10 for sealing the liquefied natural gas while contacting the liquefied natural gas, and the primary thermal insulation provided on the outer side of the primary sealing wall 10 And a secondary heat insulating wall 30 provided outside the wall 20 and the primary heat insulating wall 20.

1차 밀봉벽(10)은 1차 단열벽(20) 상부에 설치되어 액화천연가스와 접하면서 저장탱크에 저장된 액화천연가스(LNG)를 액밀하며, 1차 단열벽(20)과 2차 단열벽(30) 사이에는 1차 밀봉벽(10)으로부터 액화천연가스가 누설되는 경우 이를 액밀할 수 있는 2차 밀봉벽(미도시)이 마련될 수 있다. The primary sealing wall 10 is installed above the primary insulating wall 20 and liquid-tightens the liquefied natural gas (LNG) stored in the storage tank while being in contact with the liquefied natural gas, and the primary insulating wall 20 and the secondary insulation A second sealing wall (not shown) may be provided between the walls 30 to seal the liquefied natural gas from the primary sealing wall 10.

1차 밀봉벽(10) 및 2차 밀봉벽에는 온도 변화에 의한 수축 및 신장시 파손 등을 방지하기 위한 주름구조(미도시)가 형성될 수 있다. 주름구조는 액화천연가스의 선하적에 따른 온도변화에 의하여 신장 또는 수축되어 1차 밀봉벽(10) 및 2차 밀봉벽에 가해지는 열적 변형에 따른 파손을 방지할 수 있다. Wrinkle structures (not shown) may be formed in the primary sealing wall 10 and the secondary sealing wall to prevent breakage during shrinkage and stretching due to temperature changes. The corrugated structure can be prevented from being damaged due to thermal deformation applied to the primary sealing wall 10 and the secondary sealing wall by being stretched or shrunk by the temperature change according to the loading of the liquefied natural gas.

1차 및 2차 단열벽(20, 30) 각각은 상부와 하부의 판재와, 상 하부 판재 사이에 마련되는 단열재를 포함하여 이루어지며, 상 하부 판재는 플라이우드(Plywood) 재질로, 단열재는 폴리우레탄 폼(Polyurethane Foam)으로 마련될 수 있다. 1차 단열벽(20)의 상부 면에 금속 소재의 스트립(strip)(미도시)을 마련하고, 스트립 상에 1차 밀봉벽(10)을 용접하여 마련할 수 있다.Each of the primary and secondary insulation walls 20 and 30 includes upper and lower plates and insulation provided between the upper and lower plates, and the upper and lower plates are made of plywood, and the insulation is made of poly It may be provided with a polyurethane foam (Polyurethane Foam). A strip (not shown) of a metal material may be provided on the upper surface of the primary insulating wall 20, and the primary sealing wall 10 may be welded on the strip.

본 실시예의 고정장치는 이러한 구조의 액화천연가스 저장탱크에서, 1차 및 2차 단열벽(30) 사이를 고정하면서 액밀성과 단열성을 유지하기 위해 마련되는 것이다. In the liquefied natural gas storage tank of this structure, the fixing device of the present embodiment is provided to maintain liquid tightness and heat insulation while fixing between the primary and secondary heat insulating walls 30.

도 1에 도시된 바와 같이, 본 고정장치는, 1차 단열벽(20)과 2차 단열벽(30)을 고정시키는 단열벽 고정장치(100)와, 단열벽 고정장치(100)의 상부에서 단열벽 고정장치(100)의 설치로 발생하는 공간을 단열하도록 마련되는 단열 플러그(200)를 포함하여 구성된다. As shown in FIG. 1, the fixing device includes an insulating wall fixing device 100 for fixing the primary insulating wall 20 and the secondary insulating wall 30, and an upper portion of the insulating wall fixing device 100. It is configured to include a heat insulation plug 200 is provided to insulate the space generated by the installation of the heat insulation wall fixing device 100.

단열벽 고정장치(100)는, 2차 단열벽(30)에 고정 결합되는 스터드 볼트(110)와, 스터드 볼트(110)에 체결되는 너트(120)와, 너트(120)의 외측면을 감싸도록 마련되어 액화천연가스의 하중을 분산시키는 스페이서(150)를 포함한다. 또한 단열벽 고정장치(100)는, 1차 단열벽(20)의 하부판과 너트(120) 사이에 삽입되어 1차 단열벽(20)의 하부판이 수축해도 단열벽 고정장치(100)가 이탈되지 않도록 하는 스페셜 와셔(special washer, 130)와, 스페셜 와셔(130)와 너트(120) 사이에 삽입되어 1차 단열벽(20)의 하부판이 높이 방향으로 수축하는 경우 너트(120)가 풀리는 것을 방지하는 스프링 와셔(spring washer, 140)를 더 포함할 수 있다. The insulation wall fixing device 100 wraps the stud bolt 110 fixedly coupled to the secondary insulation wall 30, the nut 120 fastened to the stud bolt 110, and an outer surface of the nut 120. It is provided so as to include a spacer 150 for dispersing the load of the liquefied natural gas. In addition, the heat insulation wall fixing device 100 is inserted between the lower plate of the primary heat insulation wall 20 and the nut 120 so that the insulation wall fixing device 100 does not detach even when the bottom plate of the primary heat insulation wall 20 shrinks. And a special washer 130 to be inserted between the special washer 130 and the nut 120 to prevent the nut 120 from loosening when the lower plate of the primary insulation wall 20 shrinks in the height direction. The spring washer 140 may further include.

우선, 2차 단열벽(30)의 상부판에는 금속 소재의 스트립(strip)(40)이 설치되고, 스터드 볼트(110)는 스트립(40)에 고정되는데, 스트립(40)의 내측과 스터드 볼트(110)의 하부는 나사산이 형성된 암나사와 수나사의 구조로 마련되어, 스터드 볼트(110)를 스트립(40)의 내측에 맞물려 돌리면 스터드 볼트(110)가 스트립(40)에 체결 고정될 수 있다. First, a strip 40 of metal material is installed on the top plate of the secondary insulating wall 30, and the stud bolt 110 is fixed to the strip 40. The inside of the strip 40 and the stud bolt are installed. The lower part of the 110 is provided with a threaded female thread and a male thread structure, and when the stud bolt 110 is engaged with the inner side of the strip 40, the stud bolt 110 may be fastened and fixed to the strip 40.

1차 단열벽(20) 및 2차 밀봉벽(미도시)에는 단열벽 고정장치(100)가 설치되는 위치에 미리 관통구멍이 형성되는데, 스터드 볼트(110)를 1차 단열벽(20) 및 2차 밀봉벽의 관통구멍에 삽입하여 설치하고, 스페셜 와셔(130) 및 스프링 와셔(140)를 끼운 후, 스터드 볼트(110)에 너트(120)를 체결하여 1차 단열벽(20)을 2차 단열벽(30)에 고정시킨다. Through holes are formed in the first heat insulating wall 20 and the second sealing wall (not shown) at the position where the heat insulating wall fixing device 100 is installed, and the stud bolt 110 is connected to the first heat insulating wall 20 and Insert it into the through hole of the secondary sealing wall, install the special washer 130 and the spring washer 140, and then tighten the nut 120 to the stud bolt 110 to connect the primary insulation wall 20 to the second. It is fixed to the vehicle heat insulating wall (30).

스페셜 와셔(130)는 1차 단열벽(20)의 하부판이 수축하더라도 단열벽 고정장치(100)로부터 이탈되지 않도록 하는 역할을 한다. 스페셜 와셔(130)는 너트(120)의 지름보다 더 큰 지름을 가짐으로써, 1차 단열벽(20)의 하부판이 슬라이딩할 수 있는 넓은 영역을 확보하도록 한다. The special washer 130 serves to prevent the insulation from the insulation wall fixing device 100 even if the lower plate of the primary insulation wall 20 shrinks. The special washer 130 has a diameter larger than the diameter of the nut 120, so as to secure a wide area in which the lower plate of the primary insulation wall 20 can slide.

너트(120)를 스터드 볼트(110)와 체결한 후, 스페이서(150)를 끼울 수 있는데, 스페이서(150)는 너트(120)의 옆면을 감쌀 수 있도록 도너츠 형 구조이고, 플라이우드로 제작될 수 있다. 스페이서(150)는 액화천연가스의 하중을 분산시켜 스터드 볼트(110)와 너트(120)를 보호할 수 있다. After fastening the nut 120 with the stud bolt 110, the spacer 150 may be fitted, and the spacer 150 may have a donut-shaped structure to cover the side surface of the nut 120, and may be made of plywood. have. The spacer 150 may distribute the load of the liquefied natural gas to protect the stud bolt 110 and the nut 120.

이러한 구조의 단열벽 고정장치(100)에 따르면, 1차 단열벽(20)의 하부판이 2차 밀봉벽과 스페셜 와셔(130) 사이에서 슬라이딩할 수 있는 구조를 이룸으로써, 1차 단열벽(20)이 열 수축 시 수평방향으로 슬라이딩하여 열 응력을 최소화할 수 있다. According to the insulation wall fixing device 100 of this structure, the lower plate of the primary insulation wall 20 forms a structure that can slide between the secondary sealing wall and the special washer 130, the primary insulation wall 20 ) Can minimize the thermal stress by sliding horizontally during heat shrinkage.

상술한 바와 같이 단열벽 고정장치(100)를 설치하기 위해서 2차 단열벽(30)의 상부, 1차 단열벽(20)에는 홀, 즉 관통구멍이 형성되어 있다. 그런데 단열벽 고정장치(100)의 설치 작업이 완료된 후, 이러한 관통구멍을 그대로 두면 냉점(cold spot)이 발생하여 저장 탱크의 단열 시스템에 구조적인 문제가 발생할 수 있고, BOR(Boil Off Rate)이 증가하는 문제가 있다. 따라서 본 실시예에서는 단열 플러그(200)로 홀을 막는데, 단열벽 고정장치의 스페이서(150)를 끼운 후, 단열 플러그(200)를 관통구멍에 끼우고 고정한다.As described above, in order to install the heat insulation wall fixing device 100, a hole, that is, a through hole is formed in the upper portion of the second heat insulation wall 30 and the primary heat insulation wall 20. However, after the installation work of the insulation wall fixing device 100 is completed, if the through-holes are left as they are, a cold spot may occur, which may cause structural problems in the insulation system of the storage tank. There is a growing problem. Therefore, in the present embodiment, the hole is closed by the insulating plug 200, and after inserting the spacer 150 of the insulating wall fixing device, the insulating plug 200 is inserted into the through hole and fixed.

단열 플러그(200)는, 플라이우드로 이루어지는 상부 및 하부 판(210, 230)과, 상부 및 하부 판(210, 230) 사이에 마련되는 단열재(220)와, 하부 판(230)의 하단에 끼워져 체결되며 단열벽 고정장치(100)에 결합되는 하부 캡부(240)를 포함한다. 상부 및 하부 판(210, 230)은 플라이우드로 이루어지고, 단열재는 폴리우레탄폼일 수 있다. The thermal insulation plug 200 is fitted to the upper and lower plates 210 and 230 made of plywood, the thermal insulation material 220 provided between the upper and lower plates 210 and 230, and the lower end of the lower plate 230. It is fastened and includes a lower cap 240 is coupled to the insulating wall fixing device (100). The upper and lower plates 210 and 230 may be made of plywood, and the insulation may be polyurethane foam.

도 1 내지 3에 도시된 바와 같이 단열 플러그(200)는 하부 캡부(240), 하부 판(230) 및 단열재(220)의 단면 지름보다, 단면 지름이 큰 상부 판(210)에 의해 헤드(200H)가 마련되는 원기둥 형상일 수 있다. 도 1에 도시된 바와 같이 1차 단열벽(20)은, 단열 플러그(200)가 관통구멍에 삽입된 후, 단열 플러그의 헤드(200H) 부분이 1차 단열벽(20) 상부 판재에 얹히도록 가공될 수 있다. As shown in FIGS. 1 to 3, the heat insulation plug 200 has a head 200H by the upper plate 210 having a larger cross-sectional diameter than the cross-sectional diameter of the lower cap portion 240, the lower plate 230, and the heat insulating material 220. ) May be provided in a cylindrical shape. As shown in FIG. 1, the primary heat insulation wall 20 is formed such that the head 200H of the insulation plug is placed on the upper plate of the primary insulation wall 20 after the insulation plug 200 is inserted into the through hole. Can be processed.

하부 캡부(240)는, 단열 플러그 하부 판(230)의 하단에 체결되는 캡부(241)와, 캡부(241)의 하단에서 방사형으로 연장되며 단열벽 고정장치(100)에 결합되는 플랜지부(242)를 포함한다. The lower cap part 240 includes a cap part 241 fastened to the lower end of the insulating plug lower plate 230, and a flange part 242 extending radially from the lower end of the cap part 241 and coupled to the insulating wall fixing device 100. ).

단열 플러그 하부 판(230)은 중심부에 구멍이 형성되어 있어서, 이 구멍에 하부 캡부의 캡부(241)가 삽입되어, 하부 판(230)과 하부 캡부(240)가 체결된다.The heat insulation plug lower plate 230 has a hole formed in the center thereof, and the cap portion 241 of the lower cap portion is inserted into the hole, and the lower plate 230 and the lower cap portion 240 are fastened.

하부 캡부 중 캡부(241)의 내측에는 나사산이 형성되며, 나사산이 스터드 볼트(110)의 상부에 볼팅(bolting)으로 체결되어, 단열 플러그(200)가 단열벽 고정장치(100)에 결합될 수 있다.A thread is formed inside the cap 241 of the lower cap part, and the thread is fastened to the upper part of the stud bolt 110 by bolting, so that the insulating plug 200 may be coupled to the insulating wall fixing device 100. have.

이와 같이 본 실시예의 장치는, 나사산 모양이 가공된 구성 부분들을 볼팅으로 체결함으로써, 작업이 용이하며 작업 시간을 단축할 수 있다. 또한 접착제를 이용할 필요가 없어 온도 변화가 있더라도 구조의 유지력이 강하며, 구조적으로 안정성이 높은 장점이 있다. As described above, the device of the present embodiment is fastened by bolting the component parts processed with the thread shape, so that the work is easy and the working time can be shortened. In addition, there is no need to use an adhesive, even if there is a temperature change, the structure has a strong holding force, and structurally, there is an advantage of high stability.

다음의 실시예에 따라 단열 플러그(200)를 가공함으로써 고정장치의 조립 및 설치 성능을 보다 향상시킬 수 있다. By processing the insulating plug 200 according to the following embodiment it is possible to further improve the assembly and installation performance of the fixing device.

먼저, 도 2에 도시된 바와 같이 제1 실시예는 단열 플러그(200A)의 상부 판(210)에 의한 헤드의 상단면에 복수의 홀(H)을 마련하는 것이다. 전술한 바와 같이 단열 플러그(200)의 바닥면, 즉 단열 플러그의 하부 캡부(240)의 내측에는 단열벽 고정장치의 스터드 볼트(110)와 결합될 수 있는 나사산이 형성되어 있어서, 단열 플러그(200)와 단열벽 고정장치(100)는 볼팅(bolting)으로 결합되는데, 단열 플러그의 상부 판 (210)헤드 상단면에 복수의 홀(H)을 마련함으로써 볼팅 작업이 원활하게 이루어질 수 있어 작업효율 및 생산성을 높일 수 있다. First, as shown in FIG. 2, the first embodiment is to provide a plurality of holes H in the upper end surface of the head by the upper plate 210 of the insulating plug 200A. As described above, the bottom surface of the insulation plug 200, that is, the inner side of the lower cap portion 240 of the insulation plug is formed with a thread that can be coupled with the stud bolt 110 of the insulation wall fixing device, the insulation plug 200 ) And the insulation wall fixing device 100 is bolted (bolting), by providing a plurality of holes (H) in the upper surface of the top plate 210 head of the insulation plug can be made smoothly bolting operation work efficiency and Productivity can be increased.

헤드 상단면에 마련된 홀(H)에 장비를 끼워 수월하게 볼팅할 수 있으므로, 단열 플러그 상부 판(210)과 1차 단열벽(20)의 관통구멍 사이에 볼팅 작업을 위한 별도의 공간이 필요치 않다. 따라서 단열 플러그 상부 판(210)을 관통구멍에 맞추어 가공하여, 단열성을 높일 수 있고, 남거나 뜨는 공간 없이 단열 플러그(200)가 관통구멍에 맞물릴 수 있어 구조적으로 안정적이다. Since the equipment can be easily bolted by inserting the equipment into the hole H provided on the top surface of the head, a separate space for the bolting operation is not required between the insulation plug upper plate 210 and the through hole of the primary insulation wall 20. . Therefore, the insulating plug upper plate 210 is processed in accordance with the through-hole, thereby increasing the heat insulating property, and the insulating plug 200 can be engaged with the through-hole without any remaining or floating space, thereby being structurally stable.

도 3에 도시된 바와 같이 제2 실시예는 단열 플러그(200B)의 상부 판(210) 헤드 상단면에 열 십(十)자형의 홈(C)을 마련하는 것이다. 십자형의 홈을 마련함으로써 전술한 제1 실시예와 마찬가지로 단열벽 고정장치(100)와 단열 플러그(200)의 설치 작업 시 작업효율을 높일 수 있다. As shown in FIG. 3, the second embodiment provides a dozen-shaped groove C on the top surface of the head of the upper plate 210 of the insulating plug 200B. By providing a cross-shaped groove, as in the above-described first embodiment, it is possible to increase work efficiency when installing the insulation wall fixing device 100 and the insulation plug 200.

또한 상부 판(210) 상단면을 가로지르는 십자형의 홈(C)은, 저장탱크를 설치한 후 질소가스 등을 이용하여 저장탱크를 퍼징(Purging)할 때, 가스가 순환할 수 있는 경로를 제공할 수 있는 효과도 있다. In addition, the cross-shaped groove C crossing the upper surface of the upper plate 210 provides a path through which gas can circulate when purging the storage tank using nitrogen gas after installing the storage tank. There is also an effect that can be done.

이와 같은 본 발명은 기재된 실시 예에 한정되는 것이 아니고, 본 발명의 사상 및 범위를 벗어나지 않고 다양하게 수정 및 변형될 수 있음은 이 기술의 분야에서 통상의 지식을 가진 자에게 자명하다. 따라서 그러한 수정 예 또는 변형 예들은 본 발명의 특허청구범위에 속한다 하여야 할 것이다.The present invention is not limited to the described embodiments, and various modifications and changes can be made without departing from the spirit and scope of the present invention. Therefore, such modifications or variations will have to be belong to the claims of the present invention.

Claims (11)

액화천연가스와 접하면서 상기 액화천연가스를 액밀하는 1차 밀봉벽; 상기 1차 밀봉벽의 외측에 마련되는 1차 단열벽; 및 상기 1차 단열벽의 외측에 마련되는 2차 단열벽;을 포함하는 액화천연가스 저장탱크에 마련되는 고정장치에 있어서, A primary sealing wall for liquid-tightening the liquefied natural gas while being in contact with the liquefied natural gas; A primary heat insulation wall provided outside the primary sealing wall; In the fixing device provided in the liquefied natural gas storage tank comprising; and a secondary heat insulating wall provided on the outside of the primary heat insulating wall, 상기 1차 단열벽과 상기 2차 단열벽을 고정시키는 단열벽 고정장치; 및An insulation wall fixing device for fixing the primary insulation wall and the secondary insulation wall; And 상기 단열벽 고정장치의 상부에서 상기 단열벽 고정장치의 설치로 발생하는 공간을 단열하도록 마련되는 단열 플러그;를 포함하는 액화천연가스 저장탱크의 고정장치. And a heat insulation plug provided to insulate a space generated by the installation of the heat insulation wall fixing device at an upper portion of the heat insulation wall fixing device. 제 1항에 있어서, 상기 단열 플러그는 The method of claim 1, wherein the insulating plug is 플라이우드로 이루어지는 상부 및 하부 판;Upper and lower plates made of plywood; 상기 상부 및 하부 판 사이에 마련되는 단열재; 및An insulation provided between the upper and lower plates; And 상기 하부 판의 하단에 체결되도록 마련되며 상기 단열벽 고정장치에 결합되는 하부 캡부;를 포함하며, And a lower cap part provided to be fastened to a lower end of the lower plate and coupled to the heat insulation wall fixing device. 상기 단열 플러그는 상기 하부 캡, 하부 판 및 단열재의 단면 지름보다, 단면 지름이 큰 상기 상부 판에 의해 헤드가 마련되는 원기둥 형상인 것을 특징으로 하는 액화천연가스 저장탱크의 고정장치. The insulating plug is a fixed device of the LNG storage tank, characterized in that the head is provided by the upper plate having a larger cross-sectional diameter than the cross-sectional diameter of the lower cap, the lower plate and the heat insulating material. 제 2항에 있어서, The method of claim 2, 상기 상부 판에 의한 헤드의 상단면에는 복수의 홀이 마련되는 것을 특징으로 하는 액화천연가스 저장탱크의 고정장치. Fixing device of the LNG storage tank, characterized in that a plurality of holes are provided on the upper surface of the head by the upper plate. 제 2항에 있어서, The method of claim 2, 상기 상부 판에 의한 헤드의 상단면에는 저장탱크의 퍼징(Purging) 시 가스의 순환 경로를 제공할 수 있는 십자형의 홈이 마련되는 것을 특징으로 하는 액화천연가스 저장탱크의 고정장치. Fixing device of the LNG storage tank, characterized in that the top surface of the head by the upper plate is provided with a cross-shaped groove that can provide a gas circulation path when purging the storage tank. 제 2항 내지 제 4항 중 어느 한 항에 있어서, 상기 하부 캡부는 The lower cap unit according to any one of claims 2 to 4, wherein 상기 하부 판의 하단에 체결되는 캡부; 및A cap part fastened to the lower end of the lower plate; And 상기 캡부의 하단에서 방사형으로 연장되며 상기 단열벽 고정장치에 결합되는 플랜지부를 포함하며, A radially extending from the bottom of the cap portion and comprises a flange portion coupled to the heat insulation wall fixing device, 상기 하부 판은 중심부에 구멍이 형성되어, 상기 구멍에 하부 캡부의 캡부가 삽입되어 체결되는 것을 특징으로 하는 액화천연가스 저장탱크의 고정장치. The lower plate has a hole formed in the center, the capping device of the LNG storage tank, characterized in that the cap is inserted into the lower cap portion is fastened to the hole. 제 5항에 있어서, 상기 단열벽 고정장치는 The method of claim 5, wherein the insulating wall fixing device 상기 2차 단열벽에 고정 결합되는 스터드 볼트;A stud bolt fixedly coupled to the secondary insulating wall; 상기 스터드 볼트에 체결되는 너트를 포함하고, A nut fastened to the stud bolt, 상기 1차 단열벽에는 관통구멍이 형성되고, 상기 스터드 볼트가 상기 관통구멍에 삽입된 후 상기 너트와 체결되어, 상기 단열벽 고정장치에 의해 상기 1차 단열벽이 상기 2차 단열벽에 고정되는 것을 특징으로 하는 액화천연가스 저장탱크의 고정장치. A through hole is formed in the primary heat insulation wall, and the stud bolt is inserted into the through hole, and then fastened to the nut so that the primary heat insulation wall is fixed to the secondary heat insulation wall by the heat insulation wall fixing device. Fixing device of the LNG storage tank, characterized in that. 제 6항에 있어서, 상기 단열벽 고정장치는 The method of claim 6, wherein the insulating wall fixing device 상기 1차 단열벽의 하부판과 상기 너트 사이에 삽입되어 상기 1차 단열벽의 하부판이 수축해도 상기 단열벽 고정장치가 이탈되지 않도록 하는 스페셜 와셔를 더 포함하는 액화천연가스 저장탱크의 고정장치. And a special washer inserted between the lower plate of the primary insulation wall and the nut to prevent the insulation wall fixing device from being separated even when the lower plate of the primary insulation wall shrinks. 제 7항에 있어서, 상기 단열벽 고정장치는The method of claim 7, wherein the insulating wall fixing device 상기 스페셜 와셔와 상기 너트 사이에 삽입되어 상기 1차 단열벽의 하부판이 높이 방향으로 수축하는 경우 상기 너트가 풀리는 것을 방지하는 스프링 와셔를 더 포함하는 액화천연가스 저장탱크의 고정장치. And a spring washer inserted between the special washer and the nut to prevent the nut from loosening when the lower plate of the primary insulation wall contracts in the height direction. 제 6항에 있어서, The method of claim 6, 상기 2차 단열벽의 상부판에는 금속 소재의 스트립이 설치되고, 상기 스터드 볼트는 상기 스트립에 고정되는 것을 특징으로 하는 액화천연가스 저장탱크의 고정장치. Fixing device of the LNG storage tank, characterized in that the upper plate of the secondary insulating wall is provided with a strip of metal material, the stud bolt is fixed to the strip. 제 6항에 있어서, 상기 단열벽 고정장치는The method of claim 6, wherein the insulating wall fixing device 상기 너트의 외측면을 감싸도록 마련되어 상기 액화천연가스의 하중을 분산시키는 스페이서를 더 포함하는 액화천연가스 저장탱크의 고정장치. Fixing device of the liquefied natural gas storage tank further comprises a spacer provided to surround the outer surface of the nut to distribute the load of the liquefied natural gas. 제 6항에 있어서, The method of claim 6, 상기 하부 캡부 중 캡부의 내측에는 나사산이 형성되며, 상기 나사산이 상기 스터드 볼트의 상부에 체결되어, 상기 단열 플러그가 상기 단열벽 고정장치에 결합되는 것을 특징으로 하는 액화천연가스 저장탱크의 고정장치. A screw thread is formed inside the cap part of the lower cap part, and the screw thread is fastened to an upper portion of the stud bolt, so that the heat insulating plug is coupled to the heat insulating wall fixing device.
PCT/KR2016/005968 2015-07-21 2016-06-07 Fixation apparatus of liquefied natural gas storage tank Ceased WO2017014426A1 (en)

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