WO2022270672A1 - Membrane pour réservoir de stockage de gaz liquéfié - Google Patents

Membrane pour réservoir de stockage de gaz liquéfié Download PDF

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Publication number
WO2022270672A1
WO2022270672A1 PCT/KR2021/009464 KR2021009464W WO2022270672A1 WO 2022270672 A1 WO2022270672 A1 WO 2022270672A1 KR 2021009464 W KR2021009464 W KR 2021009464W WO 2022270672 A1 WO2022270672 A1 WO 2022270672A1
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WIPO (PCT)
Prior art keywords
pleats
pair
center
membrane
liquefied gas
Prior art date
Application number
PCT/KR2021/009464
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English (en)
Korean (ko)
Inventor
오병택
윤용근
양영철
서흥석
진교국
한해철
임기호
Original Assignee
한국가스공사
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Publication of WO2022270672A1 publication Critical patent/WO2022270672A1/fr

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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 
    • 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
    • F17C3/00—Vessels not under pressure
    • F17C3/02—Vessels not under pressure 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
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/01—Reinforcing or suspension means
    • F17C2203/011—Reinforcing means
    • F17C2203/012—Reinforcing means on or in the wall, e.g. ribs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0636—Metals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/21—Shaping processes
    • F17C2209/2181—Metal working processes, e.g. deep drawing, stamping or cutting
    • 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
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/01—Improving mechanical properties or manufacturing
    • F17C2260/011—Improving strength
    • 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 a membrane for a liquefied gas storage tank that forms a sealing wall of a liquefied gas storage tank, and more particularly, reduces the risk of fatigue failure by reducing plastic strain due to cryogenic liquefied gas, It relates to a membrane for a liquefied gas storage tank capable of improving productivity and a manufacturing method of the membrane.
  • Liquefied natural gas is obtained by cooling and liquefying methane obtained by refining natural gas collected from gas fields. .
  • liquefied natural gas (hereinafter referred to as 'LNG') is obtained by cooling natural gas to an extremely low temperature (about -163 ° C), and its volume is reduced to about 1/600 of that of gaseous natural gas, so it is safe to use the sea. It is very suitable for transport over long distances.
  • Liquefied gas is transported in a gaseous state through onshore or offshore gas pipelines, or transported in a liquid state to a distant consumer while stored on a transport ship.
  • a liquefied gas storage tank (commonly referred to as a 'cargo hold') that can withstand the cryogenic temperature of LNG is provided in an LNG RV (Regasification Vessel)
  • LNG FPSO Floating, Production, Storage and Offloading
  • LNG FPSO Floating, Production, Storage and Offloading
  • LNG FPSO Floating, Production, Storage and Offloading
  • LNG FPSO Floating, Production, Storage and Offloading
  • LNG RVs Liquefied gas storage tanks installed in LNG carriers or LNG RVs are also included in offshore structures such as LNG Floating Storage and Regasification Units (FSRUs) that vaporize LNG as needed and supply it to onshore consumers.
  • FSRUs LNG Floating Storage and Regasification Units
  • liquefied gas storage tanks can be classified into a membrane type and an independent type depending on whether the cargo load directly acts on the insulation.
  • a typical membrane-type LNG storage tank includes a secondary insulation layer installed on the inner wall of the hull, a secondary sealing layer installed on the secondary insulation layer, a primary insulation layer installed on the secondary sealing layer, and a first insulation layer installed on the primary insulation layer.
  • a primary sealing layer is included.
  • the insulation layer is to prevent the liquefied gas from being heated by preventing external heat from entering the storage tank, and the sealing layer is to prevent the liquefied gas from leaking out of the storage tank. Even if one sealing layer is damaged, the other The sealing structure of the cargo hold is composed of a double layer so that the sealing layer can prevent leakage of liquefied natural gas.
  • a plurality of secondary insulation panels are coupled on the inner wall of the hull, a secondary sealing wall is installed on the plurality of secondary insulation panels, and a secondary sealing wall is placed on the secondary sealing wall. It is manufactured through the process of installing the primary insulation panel and finally installing the primary sealing wall on the primary insulation panel.
  • a plurality of insulation panels are combined on the inner wall of the hull to form one insulation layer, and then a secondary barrier is installed on the plurality of insulation panels. And, by installing a primary barrier on the secondary sealing wall, it is possible to have one heat insulating layer and two sealing walls.
  • FIG. 1 is a plan view showing a part of a membrane for a liquefied gas storage tank according to the prior art
  • FIG. 2 is a view showing the wrinkled membrane of FIG. 1 in a separated manner.
  • the sealing wall may be provided by connecting a plurality of membranes by welding.
  • the sealing wall may be provided to achieve a complete sealing state by attaching the wrinkled membrane 10 having the wrinkles 11 and 13 and the flat plate membrane 30 having a flat surface by welding to form a certain pattern. .
  • the creases 11 and 13 are a pair of side pleats 11 formed in a straight line parallel to each other and a straight line at regular intervals between the pair of side pleats 11. It may include a pair of central wrinkles 13 disposed as.
  • the pair of side wrinkles 11 and the pair of central wrinkles 13 may have the same size (or length) and shape.
  • the membrane for a liquefied gas storage tank according to the prior art is formed so that four wrinkles 11 and 13 having the same size and shape are alternately arranged on a metal plate, thereby shrinking and expanding due to cryogenic LNG. It is provided to absorb thermal stress that may occur.
  • the stress may be concentrated and applied to the end of the central corrugated portion 13 protruding in the longitudinal direction compared to both ends of the side corrugated portion 11 in the longitudinal direction, and thermal deformation may be relatively large.
  • sloshing load due to the flow of fluid occurs in the membrane due to the nature of a ship or floating structure used in a floating state at sea, as well as thermal stress due to cryogenic LNG.
  • such a membrane for a liquefied gas storage tank is formed by drawing a metal plate to form a plurality of wrinkles.
  • the area where the wrinkles are formed has a thickness deviation according to the amount of overlapping wrinkles, that is, the thickness of the metal plate by drawing A thinned area occurs, and as a result, pressure resistance is lowered and may be vulnerable to thermal stress.
  • the membrane for a liquefied gas storage tank according to the prior art has a considerable area occupied by wrinkles on a metal sheet material, so it can be easily contracted and expanded due to cryogenic LNG. Since a tensile force is generated in the direction to cause deformation such as twisting, molding quality may be deteriorated and productivity may be deteriorated accordingly.
  • a thicker metal plate eg, 1.5t, 2t, etc.
  • a thicker metal plate eg, 1.5t, 2t, etc.
  • the present invention is to provide a membrane for a liquefied gas storage tank capable of reducing the plastic strain due to cryogenic liquefied gas by improving the shape of the wrinkles of the membrane for a liquefied gas storage tank, thereby reducing the risk of fatigue failure.
  • the purpose is to provide a membrane for a liquefied gas storage tank capable of reducing the plastic strain due to cryogenic liquefied gas by improving the shape of the wrinkles of the membrane for a liquefied gas storage tank, thereby reducing the risk of fatigue failure.
  • Another object is to provide a method of manufacturing a membrane for a liquefied gas storage tank and a mold for manufacturing the membrane, which can not only reduce the manufacturing cost of the membrane, but also significantly improve the convenience of the operator to improve quality and productivity.
  • a membrane forming a sealing wall of a liquefied gas storage tank, a membrane having a plurality of wrinkles to form a sealing wall of the liquefied gas storage tank, wherein the plurality of wrinkles are mutually connected in one direction.
  • a pair of side pleats that are spaced apart and disposed in parallel; And a pair of center pleats disposed opposite to each other between the pair of side pleats, wherein the pair of side pleats and the pair of center pleats have different sizes applied to the membrane for a liquefied gas storage tank.
  • the height of the center pleats may be smaller than the height of the side pleats.
  • the height of the center pleats may be formed to be 10% to 30% smaller than the height of the side pleats.
  • center wrinkle portion may be formed to have a wider width than the side wrinkle portion.
  • an end positioned in an opposite direction facing the pair of center pleats may have a larger radius of curvature than the end of the side pleats.
  • an end portion positioned in an opposite direction in which the pair of center pleats face each other may be formed relatively round compared to the shape of the end portion located in a direction in which the pair of center pleats face each other.
  • the center pleats doedoe having a relatively short length compared to the side pleats, may be formed to protrude more than the side pleats in an opposite direction facing the center creases.
  • the pair of center pleats among both ends of the pair of center pleats are located in opposite directions facing each other, and the pair of side pleats may be located on the same line as the ends of the pair. .
  • the pair of side wrinkles and the pair of center wrinkles may be formed by drawing a metal plate having a predetermined thickness.
  • a die mold and preparing a plurality of insert molds drawn into the die mold as a method of manufacturing a membrane for a liquefied gas storage tank including a pair of side pleats and a pair of center pleats disposed opposite to each other between the pair of side pleats, a die mold and preparing a plurality of insert molds drawn into the die mold; and forming the plurality of wrinkles by drawing a metal plate material having a predetermined thickness using the die mold and the plurality of insert molds.
  • the plurality of insert molds may include side pleat inserts for forming the pair of side pleats and center pleat inserts for forming the pair of center pleats.
  • the die mold is provided singly to correspond to the size of the membrane, and before the step of forming the plurality of wrinkles, a step of adjusting the position of the center wrinkles by sliding the insert for center wrinkles on the die mold is further performed.
  • a step of adjusting the position of the center wrinkles by sliding the insert for center wrinkles on the die mold is further performed.
  • the die mold includes a main frame into which at least a part of the center pleat insert is inserted, and a side frame located at both ends in the longitudinal direction of the main frame and into which the remaining part of the center pleat insert is inserted,
  • the side frame and the insert for the center pleats may be replaced according to a change in the size of the membrane.
  • a mold for manufacturing a membrane for a liquefied gas storage tank including a pair of side pleats and a pair of center pleats disposed opposite to each other between the pair of side pleats, die mold; and a plurality of insert molds inserted into the die mold, wherein the plurality of insert molds include side pleat inserts for forming the pair of side pleats; And a mold for manufacturing a membrane for a liquefied gas storage tank including an insert for center pleats for forming the pair of center pleats may be provided.
  • a pair of insert grooves may be formed in the die mold to correspond to a size of the side pleat insert so that the side pleat insert is inserted and installed.
  • a guide groove may be formed extending in the longitudinal direction of the die mold between the pair of insert insertion grooves to guide sliding of the center pleat insert.
  • the guide grooves may be formed as a pair by being disposed opposite to each other between the pair of insert insertion grooves.
  • the die mold may include a main frame into which at least a part of the insert for center pleats is drawn; and side frames positioned at both ends of the main frame in the longitudinal direction and into which the remaining part of the center pleat insert is retracted.
  • the center pleat insert may be inserted into the main frame, and the remaining portion of the center pleat insert may be inserted into the side frames positioned at both ends of the main frame.
  • a plurality of inserts for center pleats may be provided with different lengths according to the size change of the membrane.
  • main frame may be provided singly, but the side frames may be provided in plural to correspond to the size of the insert for center pleats.
  • the present invention can greatly reduce the plastic strain by improving the shape of the wrinkles of the membrane for a liquefied gas storage tank, thereby significantly reducing the risk of fatigue failure.
  • the thickness of the metal plate may be reduced, but the width and height of the wrinkle portion may be changed to maintain the same stiffness as before.
  • membranes of various sizes can be manufactured with a single mold, not only can the membrane manufacturing cost be reduced, but also the operator's convenience is improved and the manufacturing process is simplified, resulting in improved membrane quality and increased productivity. can have
  • FIG. 1 is a plan view showing a part of a membrane for a liquefied gas storage tank according to the prior art.
  • Figure 2 is a view showing the corrugated membrane of Figure 1 separated.
  • FIG 3 is a plan view showing a part of a membrane for a liquefied gas storage tank according to an embodiment of the present invention.
  • FIG. 4 is a plan view showing a state in which different distances between the pair of center creases shown in FIG. 3 are applied.
  • FIG. 5 is an enlarged view of a portion of a cross section of a membrane for a liquefied gas storage tank according to an embodiment of the present invention.
  • FIG. 6 is a view schematically showing a manufacturing mold for manufacturing a membrane for a liquefied gas storage tank according to an embodiment of the present invention.
  • FIG. 7 is a view showing that a plurality of inserts for center pleats and side frames of different sizes are provided in the production mold shown in FIG. 6 as an example.
  • FIG. 8 is a block diagram for explaining a method of manufacturing a membrane for a liquefied gas storage tank according to an embodiment of the present invention.
  • FIG. 9 is a view schematically showing a modified example of a manufacturing mold for manufacturing a membrane for a liquefied gas storage tank according to an embodiment of the present invention.
  • FIG. 10 is a view showing that in the production mold shown in FIG. 9, an insert for center corrugation is slidably provided in a die mold.
  • FIG. 11 is a block diagram for explaining a method of manufacturing a membrane using the manufacturing mold shown in FIG. 10 .
  • the liquefied gas storage tank can be used to store liquid cargo containing hydrocarbon components that are liquefied at cryogenic temperatures, such as LNG and LPG, in particular, and has a membrane-type storage having a heat insulation layer and a sealing wall to store cryogenic liquid cargo such as LNG. It could be a tank.
  • liquefied gas is generally liquefied, such as cryogenic (approximately -163 ° C) LNG (Liquified Natural Gas), LPG (Liquefied Petroleum Gas) or liquefied ethylene gas (Liquefied Ethylene Gas). It may include all gaseous fuels stored as , and liquefied gas may mean liquefied gas as well as liquefied gas in a liquid state.
  • the insulation layer and the sealing wall of the liquefied gas storage tank are formed by combining a plurality of insulation panels on the inner wall of the hull to form one insulation layer, and the sealing wall having one or more layers on the plurality of insulation panels created through the installation process.
  • the present invention relates to a membrane for a liquefied gas storage tank for forming a sealing wall of the liquefied gas storage tank. By bonding, it is possible to form a sealing wall of the liquefied gas storage tank.
  • FIG. 3 is a plan view of a part of a membrane for a liquefied gas storage tank according to an embodiment of the present invention
  • FIG. 4 is a plan view showing a state in which different distances between a pair of center corrugated parts shown in FIG. 3 are applied.
  • FIG. 5 is an enlarged view of a portion of a cross section of a membrane for a liquefied gas storage tank according to an embodiment of the present invention.
  • the membrane 100 for a liquefied gas storage tank includes a plurality of wrinkles 110 for absorbing thermal stress that may occur during contraction and expansion due to cryogenic liquefied gas. , 130).
  • the pleats 110 and 130 are spaced apart from each other and disposed in parallel with the pair of side pleats 110 and the pair of side pleats 110 between the pair of side pleats 110 in the longitudinal direction. It may include a pair of center wrinkles 130 disposed opposite to each other.
  • a pair of side wrinkles 110 and a pair of center wrinkles 130 may be formed by drawing a metal plate having a predetermined thickness, and the width is short and It may have a long rectangular shape.
  • the pair of side corrugations 110 may be formed long along the longitudinal direction of the membrane 100 and may be spaced apart from each other and disposed in parallel in the width direction of the membrane 100 .
  • the pair of side pleats 110 may be formed symmetrically with respect to the central portion of the membrane 100 .
  • the pair of side pleats 110 may be spaced apart from the center or edge of the membrane 100 by the same distance, respectively, and the pair of side pleats 110 (110) It may be preferable that each longitudinal center be located on an imaginary straight line (not shown) perpendicular to the longitudinal direction of the membrane 100 and passing through the center of the membrane 100.
  • the pair of center pleats 130 are formed long along the longitudinal direction of the membrane 100, but relatively short compared to the pair of side pleats 110. can have any length.
  • pair of center pleats 130 are disposed opposite to each other in the longitudinal direction of the membrane 100 between the pair of side pleats 110, so that they are symmetrical to each other with respect to the center of the membrane 100.
  • a plurality of wrinkles 110 and 130 are formed on a metal plate to reduce thermal stress generated during contraction and expansion due to cryogenic liquefied gas. may have the effect of absorbing
  • the distance (d1) between the pair of side pleats 110 may be fixed, but the distance (d2) between the pair of center pleats 130 is the size (or , length), the size of the membrane 100 (or metal plate), or the position of the membrane 100 on the inner wall of the hull.
  • the pair of center pleats 130 have a relatively short length compared to the pair of side pleats 110, based on the plane shown in FIG. 3, the pair of center pleats 130 ) May be formed to protrude more than the pair of side wrinkles 110 in the opposite direction facing each other.
  • the distance d2 between the pair of center wrinkles 130 may be formed to be relatively larger than the distance d1 between the pair of side wrinkles 110 .
  • the area of the central flat surface of the membrane 100 is increased compared to the prior art, so that the cryogenic It may have an effect of reducing distortion of the membrane 100 due to liquefied gas.
  • the pair of center pleats 130 have a relatively short length compared to the pair of side pleats 110, and the pair of center pleats 130 face each other.
  • the ends in the opposite direction to see and both ends of the pair of side corrugations 110 may be spaced apart from both ends in the longitudinal direction of the membrane 100 by the same distance, and may be arranged in a virtual plane parallel to the width direction of the membrane 100. It may be located on a straight line (unsigned).
  • the distance d2 between the pair of center pleats 130 is the opposite end of the pair of center pleats 130 facing each other at both ends of the pair of side pleats 110. It may have a minimum value when located on the same line as , and a maximum value may be applied differently depending on the arrangement method of the membrane 100 or the result of stress analysis.
  • both ends 111 in the longitudinal direction of the side pleats 110 and a pair of center pleats 130 among both ends of the center pleats 130 in the longitudinal direction.
  • the end located in the direction facing each other into the inner end 131 and the outer end 133, the end located in the opposite direction where the pair of center pleats 130 face each other.
  • the inner end 131 of the center pleat 130 is located between the pair of side pleats 110, and the outer end 133 of the center pleat 130 is of the side pleat 110. It may be disposed more adjacent to both ends in the longitudinal direction of the membrane 100 compared to both ends 111, and the outer end 133 of the center pleat 130 and both ends 111 of the side pleat 110 are It may be arranged spaced apart by the same distance from both ends in the longitudinal direction of (100).
  • a pair of side wrinkles 110 and a pair of center wrinkles 130 may be formed by drawing a metal plate.
  • wrinkles A thick metal plate eg, 1.5t, 2t, etc. was used to compensate for the thickness deviation of the portion, which may result in a decrease in productivity and an increase in cost.
  • the membrane 100 for a liquefied gas storage tank reduces the thickness of the metal plate in order to improve productivity and reduce the manufacturing cost of the membrane 100 in the manufacturing process, but the size of the wrinkles (height and / or width) to maintain the same or similar stiffness to the existing one.
  • the metal sheet may have a thickness relatively smaller than the thickness of a metal sheet used in manufacturing a conventional membrane having a plurality of wrinkles having the same size and shape, may have a thickness of 1.2t, or may have a thickness of 1.0t. may have a thickness of
  • the pair of side pleats 110 and the pair of center pleats 130 may have different sizes.
  • FIG 5 is an enlarged view of a portion of the cross section of a membrane for a liquefied gas storage tank according to an embodiment of the present invention, and the height h1 and width w1 of the side pleats 110 and the center pleats 130 ) is a diagram showing the comparison of the height (h2) and the width (w2).
  • the height h2 of the center corrugated portion 130 may be smaller than the height h1 of the side corrugated portion 110 .
  • the height h2 of the center pleat 130 is smaller than the height h1 of the side pleat 110 by 10% to 30%, more preferably , It may be formed 20% smaller than the height h1 of the side wrinkle portion 110.
  • pair of side pleats 110 and the pair of center pleats 130 of this embodiment may have different widths as well as heights.
  • the width w2 of the center wrinkle part 130 may be greater than the width w1 of the side wrinkle part 110 .
  • the height (h2) of the center crease 130 is formed relatively small compared to the height (h1) of the side crease 110, and the width (w2) of the center crease 130 is the side crease 110 It may be formed larger than the width (w2) of.
  • the width (w2) of the center wrinkle portion 130 may be preferably formed to be 10% to 30% larger than the width (w1) of the side wrinkle portion 110, more preferably, It may be formed to be 20% larger than the width w1 of the side wrinkle portion 110 .
  • the membrane 100 of this embodiment is prepared by processing a metal material thinner than the membrane 10 described in the prior art, and the height h1 and width w of the side corrugated portion 110 are conventional. In technology, it may be formed smaller than the height and width of the pleats 11 and 13 by 70% to 90% (more preferably, 80%).
  • center pleats 130 of this embodiment are formed to have a height h2 that is 10% to 30% (more preferably 20%) smaller than the height h1 of the side pleats 110. It is formed to have a width w2 that is 10% to 30% (more preferably, 20%) larger than the width w2 of the wrinkles 110, and is the same as or similar to the widths of the wrinkles 11 and 13 in the prior art. can have
  • the height h2 of the center wrinkles 130 is greater than the height h1 of the side wrinkles 110.
  • the width w2 of the center corrugation part 130 is large compared to the width w1 of the side corrugation part 110, so that the pressure resistance performance of the membrane 100 can be improved without increasing the thickness of the metal plate. can have an effect.
  • the amount of plastic deformation such as distortion due to drawing of the metal sheet or thermal deformation due to cryogenic liquefied gas can be reduced, resulting in quality improvement and increase in productivity can be expected.
  • the side pleats 11 and the central wrinkles 13 are formed to have the same size and shape, and the membrane ( Stress is concentrated at the end of the central wrinkled portion 13 formed to protrude in the longitudinal direction of 10), and thus thermal deformation may be relatively large.
  • the maximum strain is at the end of both ends of the central wrinkled part 13 located in the opposite direction where the pair of central wrinkled parts 13 face each other and relatively adjacent to both ends in the longitudinal direction of the membrane 10. may occur.
  • the present invention improves not only the size of the plurality of wrinkles 110 and 130 formed on the membrane 100 but also the shape of the ends of at least some of the plurality of wrinkles 110 and 130, thereby reducing stress concentrated in a specific region and membrane ( 100) to reduce the plastic strain.
  • the outer end portion 133 located in the opposite direction facing each other may be formed to be relatively round compared to the shape of both ends 111 of the side wrinkle portion 110 relative to the plane.
  • outer end portion 133 of the present embodiment may have a larger radius of curvature than both ends 111 of the side pleat portion 110 as the width w2 of the center pleat portion 130 increases.
  • the inner end portion 131 of the center pleat portion 130 may have the same shape as the outer end portion 133, and similarly to both end portions 111 of the pair of side pleat portions 110, it is pointed. may have a shape.
  • the membrane 100 for a liquefied gas storage tank has a width (w2) of the center wrinkles 130 )
  • w2 width of the center wrinkles 130
  • FIG. 6 is a schematic plan view of a manufacturing mold for manufacturing a membrane for a liquefied gas storage tank according to an embodiment of the present invention
  • FIG. 7 is a center pleat insert and side in the manufacturing mold shown in FIG. 6 It is a view showing that a plurality of frames are provided with different sizes as an example
  • FIG. 8 is a block diagram for explaining a method of manufacturing a membrane for a liquefied gas storage tank according to an embodiment of the present invention.
  • a mold for manufacturing a membrane for a liquefied gas storage tank is inserted into a die mold 210 and the die mold 210 to form a plurality of wrinkles 110 and 130 . It may include a plurality of insert molds 230 for doing.
  • the die mold 210 may be composed of a main frame 211 and side frames 213 located at both ends of the main frame 211 in the longitudinal direction, and a plurality of insert molds 230, a pair It may include a side pleat insert 231 for forming the side pleats 110 and a center pleat insert 233 for forming a pair of center pleats 130 .
  • a pair of insert insertion grooves 211a into which inserts 231 for side pleats are inserted may be formed in the main frame 211 .
  • At least a part of the center pleat insert 233 may be inserted at both ends of the main frame 211 in the longitudinal direction, and the remaining part of the center pleat insert 233 is in the longitudinal direction of the main frame 211. It can be introduced into the side frame 213 located at both ends.
  • the length of the side pleats 11 may not change, but the pair of side surfaces The length of the central pleats 13 located between the pleats 11 must be varied.
  • a pair of inserts 231 for side pleats are fixed in size, and a pair of inserts for side pleats
  • the main frame 211 into which the 231 is drawn may be provided as a single unit having a fixed size.
  • a plurality of inserts 233 for center pleats may be provided with different lengths to correspond to the change in size of the membrane (see (a) in FIG. 7), and side frames located at both ends of the main frame 211. 213 may also be provided in plurality to correspond to the size of the center pleat insert 233 (see (b) in FIG. 7).
  • the production mold of this embodiment may be used to manufacture the membrane 100 shown in FIG. 3 or 4, but the present invention is not limited thereto, and the membrane 10 according to the prior art shown in FIGS. 1 to 2 ) can also be used to make
  • the entire mold and insert had to be replaced according to the change in the size of the membrane. Since the frame 211 can be used in the same way, it can have the effect of reducing the manufacturing cost of the membrane and simplifying the manufacturing process.
  • a pair of side pleats 110 and a pair of center pleats disposed opposite to each other between the pair of side pleats 110 As a method for manufacturing the membrane 100 including the portion 130, as shown in FIG. 8, preparing a die mold 210 and a plurality of insert molds 230 drawn into the die mold 210 It may include a step (S110) and a step (S150) of drawing a metal sheet having a predetermined thickness using the die mold 210 and the plurality of insert molds 230.
  • the die mold 210 may be composed of a main frame 211 and side frames 213 located at both ends in the longitudinal direction of the main frame 211, and the plurality of insert molds 230 include a pair of side corrugations ( 110) and a center pleat insert 233 for forming a pair of center pleats 130.
  • a step of replacing the side frame 213 and the center corrugation insert 233 according to the size change of the membrane (S130) may be further included.
  • FIG. 9 is a view showing a modified example of a mold for manufacturing a membrane for a liquefied gas storage tank according to an embodiment of the present invention
  • FIG. 10 is a view showing an insert for center pleats sliding into a die mold in the manufacturing mold shown in FIG. 9
  • FIG. 11 is a block diagram for explaining a method of manufacturing a membrane using the manufacturing mold shown in FIG. 9 .
  • the manufacturing mold of this modified example may include a die mold 250 and a plurality of insert molds 270 drawn into the die mold 250, similarly to the above-described embodiment.
  • the die mold 250 and the plurality of insert molds 270 of this modified example are distinguished by applying different reference numerals from those of the above-described embodiment.
  • the plurality of insert molds 270 similar to the above-described embodiment, inserts for side pleats 271 for forming a pair of side pleats 110, and a pair of center pleats An insert 273 for center pleats to form 130 may be included.
  • the die mold 250 of this modified example may be provided singly to correspond to the size of the membrane, and a pair of inserts corresponding to the size of the side pleat inserts 271 so that the inserts 271 for side pleats are retracted and installed.
  • An insertion groove 251 may be formed.
  • a guide groove 253 may be formed extending in the longitudinal direction of the die mold 250 between the pair of insert insertion grooves 251 .
  • the guide groove 253 may serve to guide the sliding of the center pleat insert 271 .
  • the guide grooves 253 are arranged to face each other between the pair of insert insertion grooves 251 and form a pair.
  • the die mold 250 is provided as a single unit to correspond to the size of the membrane 100, and the center pleat insert 273 is slid into the guide groove 253 to form the center wrinkle portion 130. The position can be easily adjusted.
  • the center pleat insert 273 of this modified example may be slidably movable in a direction in which the pair of center pleat inserts 273 face each other within the guide groove 253, that is, toward the center of the die mold 250.
  • the membrane 100 can be manufactured, it is possible to have an effect of reducing the manufacturing cost of the membrane and simplifying the manufacturing process due to a single mold.
  • S230 Prior to the step of adjusting the position of the center pleat part 130 by sliding the center wrinkle insert 273 on the die mold 250 (S230) may be further included.
  • the production mold shown in FIGS. 6 and 9 is a lower template on which a metal plate is placed, and the present invention may further include an upper template (not shown) that is positioned opposite to the metal plate and presses the metal plate. And, the upper template may have a groove corresponding to the insert mold of this embodiment.
  • the membrane for a liquefied gas storage tank can be applied to any ship or offshore structure used while floating in the sea where flow occurs, and can be applied to a liquefied gas carrier or LNG RV that transports LNG or LPG. It can be applied to ships such as (LNG Regasification Vessel) as well as offshore plants such as LNG Floating, Production, Storage and Offloading (FPSO) or LNG Floating Storage and Regasification Unit (FSRU).
  • LNG Regasification Vessel as well as offshore plants such as LNG Floating, Production, Storage and Offloading (FPSO) or LNG Floating Storage and Regasification Unit (FSRU).
  • the present invention can be equally applied to a liquefied gas storage tank installed on land as well as a liquefied gas storage tank installed inside the hull of a ship or marine structure.

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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)

Abstract

La présente invention concerne une membrane ayant une pluralité d'ondulations pour former une paroi d'étanchéité d'un réservoir de stockage de gaz liquéfié, la pluralité d'ondulations comprenant : une paire de plis latéraux espacés l'un de l'autre dans une direction pour être disposés en parallèle ; et une paire de plis centraux disposés à l'opposé l'un de l'autre entre la paire de plis latéraux, et la paire de plis latéraux et la paire de plis centraux ayant des tailles différentes appliquées à ceux-ci.
PCT/KR2021/009464 2021-06-24 2021-07-22 Membrane pour réservoir de stockage de gaz liquéfié WO2022270672A1 (fr)

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KR1020210082585A KR20230000308A (ko) 2021-06-24 2021-06-24 액화가스 저장탱크용 멤브레인
KR10-2021-0082585 2021-06-24

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WO2022270672A1 true WO2022270672A1 (fr) 2022-12-29

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10252989A (ja) * 1997-03-10 1998-09-22 Kawasaki Heavy Ind Ltd 低温タンク用メンブレン内槽の組立単位メンブレンパネ ルおよびその製造方法
US20050082297A1 (en) * 2003-10-16 2005-04-21 Gaz Transport Et Technigaz Sealed wall structure and tank furnished with such a structure
KR20050060590A (ko) * 2003-12-17 2005-06-22 현대중공업 주식회사 액화천연가스 저장탱크의 멤브레인 금속패널
KR102063710B1 (ko) * 2018-05-31 2020-01-09 한국가스공사 응력 분산용 보조 주름부를 갖춘 멤브레인 및 상기 멤브레인을 포함하는 액화가스 저장탱크
KR102055347B1 (ko) * 2013-02-14 2020-01-22 가즈트랑스포르 에 떼끄니가즈 유체 저장용 탱크를 위한 밀폐 단열 벽

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100314193B1 (ko) 1999-07-20 2001-11-15 한갑수 액화천연가스 저장탱크용 멤브레인

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10252989A (ja) * 1997-03-10 1998-09-22 Kawasaki Heavy Ind Ltd 低温タンク用メンブレン内槽の組立単位メンブレンパネ ルおよびその製造方法
US20050082297A1 (en) * 2003-10-16 2005-04-21 Gaz Transport Et Technigaz Sealed wall structure and tank furnished with such a structure
KR20050060590A (ko) * 2003-12-17 2005-06-22 현대중공업 주식회사 액화천연가스 저장탱크의 멤브레인 금속패널
KR102055347B1 (ko) * 2013-02-14 2020-01-22 가즈트랑스포르 에 떼끄니가즈 유체 저장용 탱크를 위한 밀폐 단열 벽
KR102063710B1 (ko) * 2018-05-31 2020-01-09 한국가스공사 응력 분산용 보조 주름부를 갖춘 멤브레인 및 상기 멤브레인을 포함하는 액화가스 저장탱크

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