EP3901026A1 - Dispositif de fixation de paroi d'isolation pour réservoir de stockage de gaz naturel liquéfié - Google Patents

Dispositif de fixation de paroi d'isolation pour réservoir de stockage de gaz naturel liquéfié Download PDF

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Publication number
EP3901026A1
EP3901026A1 EP19897777.9A EP19897777A EP3901026A1 EP 3901026 A1 EP3901026 A1 EP 3901026A1 EP 19897777 A EP19897777 A EP 19897777A EP 3901026 A1 EP3901026 A1 EP 3901026A1
Authority
EP
European Patent Office
Prior art keywords
insulation wall
fixing device
storage tank
socket
base socket
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.)
Granted
Application number
EP19897777.9A
Other languages
German (de)
English (en)
Other versions
EP3901026A4 (fr
EP3901026B1 (fr
Inventor
Byoung Hee Cheon
Say Yoon Park
Dong Hyuk Jang
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
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Publication date
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Publication of EP3901026A1 publication Critical patent/EP3901026A1/fr
Publication of EP3901026A4 publication Critical patent/EP3901026A4/fr
Application granted granted Critical
Publication of EP3901026B1 publication Critical patent/EP3901026B1/fr
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Anticipated expiration legal-status Critical

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    • 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
    • F17C3/025—Bulk storage in barges or on ships
    • F17C3/027—Wallpanels for so-called membrane tanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B2221/00—Methods and means for joining members or elements
    • B63B2221/02—Methods and means for joining members or elements by welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B2221/00—Methods and means for joining members or elements
    • B63B2221/08—Methods and means for joining members or elements by means of threaded members, e.g. screws, threaded bolts or nuts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B2221/00—Methods and means for joining members or elements
    • B63B2221/10—Methods and means for joining members or elements using adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B2231/00—Material used for some parts or elements, or for particular purposes
    • B63B2231/32—Vegetable materials or material comprising predominately vegetable material
    • B63B2231/34—Wood or wood products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B2231/00—Material used for some parts or elements, or for particular purposes
    • B63B2231/40—Synthetic materials
    • B63B2231/50—Foamed synthetic materials
    • 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
    • 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
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/05—Size
    • F17C2201/052—Size large (>1000 m3)
    • 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
    • F17C2203/03—Thermal insulations
    • F17C2203/0304—Thermal insulations by solid means
    • F17C2203/0329—Foam
    • F17C2203/0333—Polyurethane
    • 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
    • F17C2203/03—Thermal insulations
    • F17C2203/0304—Thermal insulations by solid means
    • F17C2203/0354—Wood
    • 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
    • F17C2203/03—Thermal insulations
    • F17C2203/0304—Thermal insulations by solid means
    • F17C2203/0358—Thermal insulations by solid means in form of panels
    • 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
    • F17C2203/0626—Multiple walls
    • F17C2203/0629—Two walls
    • 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
    • F17C2203/0626—Multiple walls
    • F17C2203/0631—Three or more walls
    • 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
    • F17C2203/0639—Steels
    • F17C2203/0643—Stainless steels
    • 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
    • F17C2203/0648—Alloys or compositions of metals
    • F17C2203/0651—Invar
    • 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
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/01—Mounting arrangements
    • F17C2205/0153—Details of mounting arrangements
    • 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
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/22—Assembling processes
    • F17C2209/227—Assembling processes by adhesive means
    • 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
    • F17C2209/228—Assembling processes by screws, bolts or rivets
    • 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
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/033—Small pressure, e.g. for liquefied gas
    • 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
    • F17C2270/0107—Wall panels

Definitions

  • the present invention relates to an insulation wall fixing device for liquefied natural gas storage tanks, and more particularly to an insulation wall fixing device for liquefied natural gas storage tanks, which couples a primary insulation wall to a secondary insulation wall disposed for insulation of liquefied natural gas.
  • Natural gas is transported in a gaseous state via onshore or offshore gas pipelines, or is transported in a liquid state, that is, in the form of liquefied natural gas (LNG) to a distant destination by an LNG carrier.
  • LNG is obtained by cooling natural gas to a cryogenic temperature (about -163°C) and has a volume of about 1/600 that of natural gas in a gaseous state.
  • LNG is suited to long distance transport by sea.
  • Structures for transporting or storing LNG such as an LNG carrier designed to carry LNG by sea to an onshore consumer site, are equipped with a storage tank that can withstand cryogenic temperatures of LNG (commonly referred to as "cargo hold").
  • Such an LNG storage tank is divided into an independent storage tank and a membrane type storage tank depending on whether a load of cargo is directly applied to an insulator.
  • the membrane type storage tank is classified into a GTT NO 96 storage tank and a MARK III storage tank
  • the independent storage tank is classified into a MOSS storage tank and an IHI-SPB storage tank.
  • the NO 96 storage tank comprises primary and secondary sealing walls constituted of 0.5 mm to 0.7 mm thick Invar (Ni content: 36%) membranes and primary and secondary insulation walls provided in the form of insulating boxes fabricated by filling a plywood box with an insulator, such as perlite powder.
  • the insulation walls of the NO 96 storage tank are provided in the form of wood boxes filled with an insulator, the NO 96 storage tank has high compressive strength and rigidity and thus can secure high levels of weldability and welding automation, as compared with the MARK III storage tank.
  • the MARK III storage tank comprises a primary sealing wall constituted of 1.2 mm thick stainless steel (SUS) membranes, a secondary sealing wall constituted of triplex sheets, and primary and secondary insulation walls provided in the form of insulation panels fabricated by bonding plywood to an upper or lower surface of polyurethane foam.
  • SUS stainless steel
  • the primary sealing wall of the MARK III storage tank has corrugations to absorb thermal contraction caused by LNG at cryogenic temperatures.
  • the corrugations can prevent occurrence of excessive stress on the membranes by absorbing deformation of the membranes.
  • the MARK III storage tank has disadvantages in terms of installation/fabrication due to a low level of automation of the primary sealing wall, which is constituted of corrugated membranes.
  • the stainless steel membrane and the triplex sheet are less expensive and easier to construct than the Invar membrane and the polyurethane foam has good insulation performance, the MARK III storage tank is widely used.
  • the primary insulation wall of the membrane-type storage tank is coupled to a fixing device disposed on an upper surface of the secondary insulation wall to be securely mounted on the upper surface of the secondary insulation wall.
  • FIG. 1 is a schematic view of a typical insulation wall fixing device for LNG storage tanks.
  • FIG. 1(a) shows mechanical coupling between a base socket 10 for coupling to a primary insulation wall and an upper protective plate 20 of a secondary insulation wall through rivets
  • FIG. 1(b) shows coupling between the base socket 10 and the upper protective plate 20 of the secondary insulation wall through bonding
  • FIG. 1(c) shows coupling between the base socket 10 and the upper protective plate 20 of the secondary insulation wall through bonding after cutting a portion of a lower surface of the upper protective plate 20 of the secondary insulation wall.
  • reference numeral 30 denotes an insulator disposed inside the secondary insulation wall.
  • Such a typical insulation wall securing device requires cutting of a substantial portion of the upper protective plate 20 for securing the base socket 10, thereby causing reduction in strength of the upper protective plate 20 of the secondary insulation wall.
  • an insulation wall fixing device for an LNG storage tank including: a primary insulation wall primarily insulating liquefied natural gas; a secondary insulation wall disposed under the primary insulation wall and secondarily insulating the liquefied natural gas, the secondary insulation wall including a secondary insulator and a secondary upper protective plate disposed on the secondary insulator; and a fixing device coupling the primary insulation wall to the secondary insulation wall, the fixing device including: a base socket having a lower circumference protruding in a step shape and a stud coupled to the base socket, wherein the base socket has a lower surface mounted on a groove formed on an upper surface of the secondary insulator and the lower circumference of the base socket supports a lower surface of the secondary upper protective plate.
  • the base socket may include a socket body constituting a body of the base socket and a socket flange protruding in a step shape from the socket body, an upper surface of the socket flange being flush with an upper surface of the secondary insulator, and the secondary upper protective plate may be disposed to sit on the upper surfaces of the secondary insulator and the socket flange.
  • An upper surface of the socket body may be flush with an upper surface of the secondary upper protective plate.
  • the secondary insulator may be formed of polyurethane foam (PUF) and the secondary upper protective plate may be formed of plywood.
  • PEF polyurethane foam
  • the base socket may be bonded to the secondary insulator.
  • the fixing device may further include a secondary sealing wall interposed between the primary insulation wall and the secondary insulation wall; and a vane protruding from a body of the stud such that a lower surface of the vane is mounted on an upper surface of the socket body, wherein an adjoining region between the secondary sealing wall and the vane is disposed on the upper surface of the socket body.
  • the secondary sealing wall may be welded to the vane in the adjoining region therebetween.
  • an insulation wall fixing device for securing a primary insulation wall to a secondary insulation wall in an LNG storage tank, the fixing device comprising: a base socket mounted on a groove formed on an upper surface of a secondary insulator of the secondary insulation wall, wherein a lower end of the base socket protrudes in a step shape such that a step portion of the base socket supports a lower surface of an upper protective plate of the secondary insulation wall.
  • An uppermost surface of the base socket may be flush with an upper surface of the upper protective plate, a step surface of the step portion protruding from the base socket may be flush with the upper surface of the secondary insulator, and the base socket may be formed with a fastening hole through which a stud is coupled to the primary insulation wall.
  • the stud may include a vane protruding therefrom to be coupled to a secondary sealing wall disposed between the primary insulation wall and the secondary insulation wall, and the secondary sealing wall may be welded to the vane on the uppermost surface of the base socket.
  • an upper surface of a socket flange supports an upper protective plate of a secondary insulation wall, whereby the upper protective plate can endure load applied thereto while maintaining strength thereof, and a cut region of the upper protective plate can be minimized, whereby the fixing device can have higher strength than a typical insulation wall fixing device.
  • welding of the secondary sealing wall is performed on an upper surface of the base socket, thereby preventing burn damage to the secondary upper protective plate due to welding heat.
  • the insulation wall fixing device according to the present invention can improve productivity through reduction in on-board labor.
  • primary and secondary are used to distinguish components providing primary sealing or insulation to an LNG storage tank from components providing secondary sealing or insulation to the LNG storage tank.
  • the term “upper” or “above” refers to an inward direction of the tank, regardless of the direction of gravity
  • the term “lower” or “below” refers to an outward direction of the tank, regardless of the direction of gravity.
  • FIG. 2 is a schematic view of an insulating structure of an LNG storage tank according to the present invention
  • FIG. 3 is a view of a secondary insulation panel of the LNG storage tank according to the present invention
  • FIG. 4 is a view of a primary insulation panel of the LNG storage tank according to the present invention.
  • the LNG storage tank according to the present invention has a structure in which a secondary insulation wall 200 constituted of multiple secondary insulation panels 210 and a primary insulation wall 100 constituted of multiple primary insulation panels 110 are sequentially stacked on an inner wall of a hull.
  • a secondary sealing wall 400 may be interposed between the secondary insulation wall 200 and the primary insulation wall 100 and a primary sealing wall (not shown) may be disposed on an upper side of the primary insulation wall 100.
  • a primary sealing wall (not shown) may be disposed on an upper side of the primary insulation wall 100.
  • the primary sealing wall is not shown.
  • the primary and secondary insulation panels 110, 210 may be manufactured as unit panels each having a hexahedral shape having a width-to-length ratio of about 1:3, preferably as unit panels having a size of about 1 m x 3 m, without being limited thereto.
  • the primary insulation panel 110 may be a sandwich panel in which plywood sheets 112, 113 are bonded to an upper or lower surface of an insulator 111 formed of polyurethane foam (PUF) or to both upper and lower surfaces of the insulator 111.
  • PEF polyurethane foam
  • the secondary insulation panel 210 may be a sandwich panel in which plywood sheets 212, 213 are bonded to an upper or lower surface of an insulator 211 formed of polyurethane foam (PUF) or to both upper and lower surfaces of the insulator 111.
  • PEF polyurethane foam
  • the primary and secondary insulation panels 110, 210 constituting the primary and secondary insulation walls 100, 200 are formed of rigid polyurethane foam (RPUF), which has higher strength than general polyurethane foam, in order to form the secondary sealing wall 400 with flat Invar membranes, as described below.
  • RPUF rigid polyurethane foam
  • the secondary insulation panels 210 may be secured to an inner wall of the hull by a bonding agent, such as mastic, or studs, and the secondary insulation panel 110 may be closely coupled to an upper side of the secondary sealing wall 400 by fixing devices 300 disposed on the upper side thereof, with the secondary sealing wall 400 interposed between the primary insulation panels 110 and the secondary insulation panels 210.
  • a bonding agent such as mastic, or studs
  • the primary sealing wall directly contacts LNG to seal the LNG and may be constituted of multiple stainless steel (SUS) membranes having corrugations formed towards the interior of the storage tank to absorb contraction due to an extremely low temperature inside the storage tank.
  • SUS stainless steel
  • the primary sealing wall (not shown) may be constituted of multiple unit membranes and may be sealed by welding the multiple unit membranes to anchor strips on the primary insulation panels 110 so as not to generate a gap therebetween.
  • the secondary sealing wall 400 may be constituted of Invar membranes.
  • the secondary sealing wall 400 may be constituted of multiple Invar strakes and may be sealed by welding the multiple Invar strakes to tongue members on the secondary insulation panels 210 so as not to generate a gap therebetween.
  • the Invar strakes refer to band-shaped metal plates having a narrow width.
  • each of the primary and secondary insulation walls 100, 200 is realized in the form of an insulation panel in which plywood sheets are bonded to an upper surface and/or a lower surface of polyurethane foam, and the secondary sealing wall 400 is constituted of flat invar membranes.
  • the flat Invar membrane has a low coefficient of thermal contraction
  • the flat Invar membrane is not suitable for a panel type insulating system in which insulation panels are formed of polyurethane foam.
  • the insulation wall supporting the membranes is required to be constituted of insulating boxes exhibiting low thermal contraction and having high rigidity, as in a typical NO 96 type storage tank.
  • the LNG storage tank has a structure for reinforcing the secondary insulation wall 200, whereby the secondary insulation wall 200 can be constituted of the insulation panels formed of the polyurethane foam and the secondary sealing wall 400 can be constituted of the flat Invar membranes.
  • a corner portion of the storage tank is provided with a transverse connector (not shown) which supports both ends of the secondary sealing wall 400.
  • the transverse connector is a grid structure disposed along an edge of each of front and rear walls of the storage tank.
  • the transverse connector is welded at one end thereof to an anchoring bar provided to an inner wall of the hull to be secured to a corner of the storage tank while supporting both ends of each of the primary and secondary sealing walls 400 at the other end thereof, thereby enabling transfer of load to the hull when the load is applied to the transverse connector.
  • the transverse connector is preferably formed of an Invar material having high rigidity and an insulating box having high rigidity may be disposed inside the transverse connector and between the transverse connector and the hull to support the transverse connector.
  • the insulating box may be prepared by filling a plywood box with perlite powder.
  • the secondary insulation wall 200 which supports the secondary sealing wall 400 constituted of the flat Invar membranes, can be constituted of insulation panels having lower rigidity than the insulating boxes.
  • a welding line can be formed linearly upon installation of the secondary sealing wall 400 on the secondary insulation wall 200, thereby enabling improvement in productivity through automation of welding.
  • each of the primary and secondary insulation walls 100, 200 is constituted of the insulation panels formed of the polyurethane foam, thereby improving insulating performance.
  • the LNG storage tank according to the present invention can reduce the thickness of the primary insulation wall to about 40% or more and the thickness of the secondary insulation wall to about 20% or more, as compared with a typical NO 96 type storage tank in which the insulation walls are provided in the form of insulating boxes, while securing the same insulating effects as the typical NO 96 type storage tank.
  • the LNG storage tank according to the present invention has a structure in which the secondary insulation panels 210 intersect with the primary insulation panels 110 disposed on the secondary insulation panels 210.
  • the primary insulation panels 110 may be disposed to intersect with the secondary insulation panels 210 such that a corner of each of the primary insulation panels 110 is placed at the center of each of the secondary insulation panels 210, whereby each primary insulation panel 110 is disposed to straddle upper surfaces of four secondary insulation panels 210.
  • the fixing devices 300 adapted to secure the primary insulation panels 110 to the secondary insulation panels 210 may be disposed inside edges on the upper surfaces of the secondary insulation panels 210, for example, at the center of each of the upper surfaces thereof.
  • one fixing device 300 may be disposed at the center of the insulation panel 210 and other fixing devices 300 may be arranged to be separated from the fixing device 300 at the center of the insulation panel 210 by the same distance in a longitudinal direction.
  • the fixing device 300 is disposed on a central line C on the secondary insulation panels 210 in a width direction to minimize displacement of the secondary insulation panels 210 in the width direction due to stress applied to the secondary insulation panels 210 and slits 214 may be formed at places separated forwards and backwards from the fixing devices 300 by the same distance to minimize displacement of the fixing devices 300 in the longitudinal direction.
  • each of the primary insulation panels 110 may be provided with securing portions S for coupling to the fixing device 300 at vertical edges on lateral sides of the primary insulation panel 110 including four corners of the primary insulation panel 110.
  • the securing portions S may be arranged at constant intervals in the longitudinal direction of the primary insulation panels 110.
  • Each of the securing portions S may be provided as a groove having a semicircular or sector-shaped cross-section and may be compressed by fastening a nut to a stud of the fixing device, with the stud of the fixing device 300 inserted into the securing portion S so as to pass therethrough, whereby the primary insulation panels 110 can be brought into close contact with the secondary insulation panels 210.
  • This structure will be described below in more detail.
  • three fixing devices 300 are disposed on the secondary insulation panels 210 and eight securing portions S are disposed at vertical edges of the primary insulation panels 110.
  • the securing portions S formed on four primary insulation panels 110 may be coupled together to the fixing device 300 disposed at the center of the secondary insulation panels 210 and the securing portions S formed on two primary insulation panels 110 may be coupled together to the fixing devices 300 separated from the center of each of the secondary insulation panels 210.
  • adjacent primary insulation panels 110 may share the fixing devices 300 interposed therebetween and eight points for supporting the primary insulation panels 110 may be guaranteed merely through three fixing devices 300 provided to one secondary insulation panel 210.
  • the securing portions S for coupling to the fixing devices 300 are provided to the corners of the primary insulation panels 110, whereby the points for supporting the primary insulation panels 110 can be secured as many as possible even with a small number of fixing devices 300, thereby improving stability of the support structure and productivity of the insulation panels.
  • Reference numeral 215 indicates insertion grooves formed to receive the tongue members to which the Invar strakes constituting the secondary sealing wall 400 are welded and reference numeral 115 indicates insertion grooves formed to receive the tongue members received in the insertion grooves 215 and edges of the Invar strakes welded to the tongue members.
  • Reference numeral 114 indicates multiple slits formed on the primary insulation panels 110 to distribute stress concentration caused by thermal contraction and reference numeral 116 indicates anchor strips disposed for welding of the primary sealing wall.
  • FIG. 5 is a schematic view of an insulation wall fixing device of the LNG storage tank according to the present invention.
  • the structure of the insulation wall fixing device 300 of the LNG storage tank according to the present invention will be described.
  • the primary insulation wall 100 includes a primary insulator 111 and a primary lower protective plate 113
  • the secondary insulation wall 200 includes a secondary insulator 211 and a secondary upper protective plate 212.
  • both the primary insulator 111 and the secondary insulator 211 may be formed of polyurethane foam (PUF)
  • both the primary lower protective plate 113 and the secondary upper protective plate 212 may be formed of plywood sheets.
  • the secondary upper protective plate 212 of the secondary insulation wall 200 may be formed with a hole corresponding to a socket body 311 described below and the primary insulation wall 100 may be formed with the securing portions S for coupling to the fixing devices 300.
  • the securing portion S provides a space for receiving an upper portion of the fixing device 300.
  • the insulation wall fixing device 300 of the LNG storage tank includes a base socket 310 disposed on the secondary insulation wall 200; a stud 320 screwed to the base socket 310 and having an upper end inserted into the securing portion S formed on the primary insulation wall 100; and a lock nut 330 coupled to the stud 320 inserted into the securing portion S.
  • the base socket 310 includes a socket body 311 which constitutes a body of the base socket 310, and a socket flange 312 protruding from a lower circumference of the socket body 311 to be inserted into a space between a groove formed on an upper surface of the secondary insulator 211 and the secondary upper protective plate 212.
  • the base socket 310 may be mounted on the groove formed on the upper surface of the secondary insulator 211 by bonding a lower surface of the base socket 310 to an upper surface of the groove.
  • An upper surface of the socket body 311 may be flush with an upper surface of the secondary upper protective plate 212 and an upper surface of the socket flange 312 may be flush with the upper surface of the secondary insulator 211. That is, as shown in the drawings, the base socket 310 may have a cross-section stepped by the socket body 311 and the socket flange 312.
  • the socket flange 312 is inserted into the space between the groove formed on the upper surface of the secondary insulator 211 and the secondary upper protective plate 212 such that the upper surface of the socket flange 312 supports an end of the secondary upper protective plate 212.
  • the socket flange 312 allows the secondary upper protective plate 212 to endure load applied from the fixing devices 300 by supporting the secondary upper protective plate 212 and the secondary upper protective plate 212 is not cut in the thickness direction and thus can endure load while maintaining strength thereof.
  • the insulation wall fixing device can secure higher fastening strength than a typical fastening mechanism (see FIG. 1 ) and can facilitate strength reinforcement through adjustment of the size or thickness of the base socket 310, the thickness of the secondary upper protective plate 212, and the like, as needed.
  • the base socket 310 may be formed of stainless steel (SUS).
  • the base socket 310 may be secured to an upper side of the secondary insulation wall 200 by placing the base socket 310 on the groove formed on the upper surface of the secondary insulator 211, followed by bonding the base socket 31 to the secondary upper protective plate 212 such that the secondary upper protective plate 212 is placed on the upper surface of the secondary insulator 211 and the upper surface of the socket flange 312.
  • the insulation wall fixing device 300 may be stored with the base socket 310 disposed on the secondary insulation wall 200, thereby improving productivity through omission of riveting and bonding operations in on-board operation.
  • the stud 320 may be a collar stud and may include a vane 321 protruding from a body of the stud 320 and mounted on an upper surface of the socket body 311.
  • the vane 321 extends from the body of the stud 320 to be slanted downwards therefrom such that a distal end of the vane 321 is placed on the upper surface of the socket body 311.
  • the secondary sealing wall 400 may be coupled to the distal end of the vane 321 by welding. That is, as shown in the drawings, the secondary sealing wall 400 may be welded to the distal end of the vane 321 to be placed between the secondary insulation wall 200 and the primary insulation wall 100.
  • a contact region between the secondary sealing wall 400 and the vane 321 is formed on the upper surface of the socket body 311 and the secondary sealing wall 400 is welded to the vane 321 in the contact region therebetween.
  • welding of the secondary sealing wall 400 is performed on the upper surface of the socket body 311, thereby preventing burn damage on the secondary upper protective plate 212 of the secondary insulation wall 210.
  • the vane 321 is welded to the secondary sealing wall 400 to secure water tightness between the base socket 310 and the stud 320, whereby a stud fastening hole h of the base socket 310 can be formed in the form of a through-hole or a blind hole.
  • the stud fastening hole h of the base socket 310 is preferably formed in a blind hole shape.
  • the insulation wall fixing device 300 of the LNG storage tank according to the present invention may further include a flat washer 340 inserted into the stud 320 through an upper portion of the stud 320 and supported by the primary lower protective plate 113 in a region of the securing portion S; and a spring washer 350 disposed on an upper surface of the flat washer 340 and supporting the lock nut 330.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (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)
EP19897777.9A 2018-12-20 2019-12-18 Dispositif de fixation de paroi d'isolation pour réservoir de stockage de gaz naturel liquéfié Active EP3901026B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020180166239A KR102158648B1 (ko) 2018-12-20 2018-12-20 액화천연가스 저장탱크의 단열벽 고정장치
PCT/KR2019/018049 WO2020130650A1 (fr) 2018-12-20 2019-12-18 Dispositif de fixation de paroi d'isolation pour réservoir de stockage de gaz naturel liquéfié

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EP3901026A1 true EP3901026A1 (fr) 2021-10-27
EP3901026A4 EP3901026A4 (fr) 2022-08-31
EP3901026B1 EP3901026B1 (fr) 2024-08-21

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EP (1) EP3901026B1 (fr)
KR (1) KR102158648B1 (fr)
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KR102351144B1 (ko) * 2020-12-18 2022-01-12 케이씨엘엔지테크 주식회사 앵커 구조체를 포함하는 액화가스 화물창 및 이의 시공방법
CN117068325B (zh) * 2023-10-13 2024-02-09 沪东中华造船(集团)有限公司 一种薄膜型围护系统绝缘模块受冷变形自适应调整方法

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US4170952A (en) * 1976-03-09 1979-10-16 Mcdonnell Douglas Corporation Cryogenic insulation system
JP4616279B2 (ja) * 2004-12-08 2011-01-19 コリア ガス コーポレイション 液化天然ガスの保存タンク及びその製造方法
KR101195605B1 (ko) * 2010-07-30 2012-10-29 삼성중공업 주식회사 액화 가스 수송 선박의 화물창
FR2977575B1 (fr) * 2011-07-06 2014-06-27 Gaztransp Et Technigaz Coupleur pour maintenir un element par rapport a une structure de retenue
FR2978748B1 (fr) * 2011-08-01 2014-10-24 Gaztransp Et Technigaz Cuve etanche et thermiquement isolante
JP6168612B2 (ja) * 2011-12-16 2017-07-26 サムスン ヘビー インダストリーズ カンパニー リミテッド 補助二次防壁、これを含む液化天然ガス貯蔵タンクおよびその製造方法
KR101399843B1 (ko) * 2012-09-27 2014-05-30 삼성중공업 주식회사 화물창 방열 시스템
KR101412486B1 (ko) * 2012-11-02 2014-07-01 삼성중공업 주식회사 액화가스 수송선박의 화물창
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US20170144733A1 (en) * 2014-07-04 2017-05-25 Daewoo Shipbuilding & Marine Engineering Co., Ltd. Liquefied natural gas storage tank and insulating wall securing device for liquefied natural gas storage tank
KR101784833B1 (ko) * 2015-10-06 2017-11-06 삼성중공업 주식회사 액화가스 화물창 및 이에 사용되는 패널 고정유닛
FR3042253B1 (fr) * 2015-10-13 2018-05-18 Gaztransport Et Technigaz Cuve etanche et thermiquement isolante
KR101772581B1 (ko) * 2015-12-15 2017-08-31 주식회사 경동원 독립형 액화가스 저장탱크의 교차적층 된 진공단열패널의 연결 구조
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EP3901026A4 (fr) 2022-08-31
KR20200077660A (ko) 2020-07-01
CN113474248A (zh) 2021-10-01
EP3901026B1 (fr) 2024-08-21
KR102158648B1 (ko) 2020-09-23
WO2020130650A1 (fr) 2020-06-25
CN113474248B (zh) 2024-03-29

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