WO2005095234A1 - Metal membrane panel of insulated lng cargo tank - Google Patents

Metal membrane panel of insulated lng cargo tank Download PDF

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Publication number
WO2005095234A1
WO2005095234A1 PCT/KR2004/003028 KR2004003028W WO2005095234A1 WO 2005095234 A1 WO2005095234 A1 WO 2005095234A1 KR 2004003028 W KR2004003028 W KR 2004003028W WO 2005095234 A1 WO2005095234 A1 WO 2005095234A1
Authority
WO
WIPO (PCT)
Prior art keywords
corrugations
transverse
metal membrane
membrane panel
longitudinal
Prior art date
Application number
PCT/KR2004/003028
Other languages
French (fr)
Inventor
Keh-Sik Min
Oi-Hyun Kim
Ick-Hung Choi
Sun-Il Won
Byong Man Kim
Original Assignee
Hyundai Heavy Industries 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 Hyundai Heavy Industries Co., Ltd. filed Critical Hyundai Heavy Industries Co., Ltd.
Priority to JP2007506068A priority Critical patent/JP4564051B2/en
Priority to EP04808205A priority patent/EP1732828B1/en
Publication of WO2005095234A1 publication Critical patent/WO2005095234A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/001—Thermal insulation specially adapted for cryogenic vessels
    • 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
    • B65D90/08—Interconnections of wall parts; Sealing means therefor
    • 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
    • B65D90/027—Corrugated or zig-zag structures; Folded plate
    • 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
    • B65D90/028—Wall construction hollow-walled, e.g. double-walled with spacers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/22—Assembling processes
    • F17C2209/221—Welding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • 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 a metal membrane panel of an insulated ? NG cargo tank, and, more particularly, to a metal membrane panel of an insulated ?LNG cargo tank, which includes a plurality of rectangular unit corrugations formed thereon, and transverse and longitudinal connecting corrugations which connect the rectangular unit corrugations to each other, so as to alleviate localized stress concentrations, and thus, to improve a functional stability.
  • ? NG is extremely cold liquid having a boiling point of -162 °C, and is stored in an insulated cargo tank having a ⁇ -ultiple wall structure.
  • the insulated cargo tank is comprised of an internal tank wall made of a metal membrane panel and an externally insulated wall surrounding the internal tank wall.
  • the metal membrane panel comes into close contact with LNG in an extremely cold state
  • the metal membrane panel is made of metal material, such as alumnim alloy, Invar, and 9% nickel steel, wMch are considerably reduced in a low temperature brittleness to resist distortion due to heat s-hrinkage.
  • the metal membrane panel includes a plurality of linear corrugations such that the metal membrane panel easily expands and contracts according to repetitive temperature variations and load variations of stored liquid.
  • a conventional metal membrane panel is shaped in a rectangular form by a thin metal plate, and is provided throughout area thereof with a plurality of longitudinal and transverse linear corrugations, to allow for the expansion and contraction according to variations in temperature and load.
  • An inner wall of a conventional insulated ?LNG cargo tank is typically constructed by a plurality of such metal membrane panels.
  • respective metal membrane panels are first overlapped at four edges thereof with edges of other adjacent metal membrane panels, and the overlapped edges of the metal membrane panels are welded by lap welding, thereby providing the resulting tank with airtightness. Disclosure of Invention Technical Problem
  • Such a conventional metal membrane panel is constructed in such a way that a plurality of longitudinal linear corrugations and a plurality of transverse linear corrugations are crossed to form a plurality of intersections on the metal membrane panel. Since each of the intersections is provided with curved surfaces w-hich have a radius of curvature smaller than that of curved surfaces of the longitudinal and transverse linear corrugations, the intersections are easily subjected to a stress concentration. Furthermore, since the metal membrane panel has a relatively complicated configuration, an operation of constructing the metal membrane panel requires increased wor-king time and processing stages, thereby causing the production of the metal membrane panel to be costly. Further, when performing an operation of joining adjacent metal membrane panels to each other by lap welding, the large number of curved portions on a welding line of the metal membrane panel causes a welding efficiency to be lowered.
  • an object of the present invention is to provide a metal membrane panel of an insulated ?LNG cargo tank, which is improved in a stability in terms of stress by decreasing localized stress concentration areas, and which is also improved in a welding efficiency by reducing the ntmber of corrugations on overlapped welding edges of an adjacent metal membrane panel to reduce the number of curved portions to be welded.
  • the present invention provides a metal membrane panel of an insulated ?LNG cargo tank, which includes a plurality of rectangular unit corrugations arranged on the panel to be spaced from each other by predetermined intervals, each of the plurality of rectangular unit corrugations being comprised of a pair of transverse bulging portions and a pair of longitudinal bulging portions and being shaped to have gently curved corners, transverse and longitudinal connecting corrugations, w-hich connect the plurality of rectangular unit corrugations to each other, and transverse and longitudinal extending corrugation, w-hich are extended to the edges of the metal membrane panel from the transverse and longitudinal bulging portions of the outermost unit corrugations w-hich are positioned adjacent to the edges of the metal membrane panel.
  • the transverse and longitudinal connecting corrugations may be increased in width frcm the centers thereof toward the unit corrugations, and the transverse and longitudinal extending corrugations may be increased in width from the edges of the metal membrane panel toward the unit corrugations.
  • the unit corrugations, the transverse and longitudinal connecting corrugations, and the transverse and longitudinal extending corrugations may be shaped to have any of semicircular, elliptical and parabolic sections, and portions where the unit corrugations, the transverse and longitudinal connecting corrugations, and the transverse and longitudinal extending corrugations are connected to a flat surface of the metal membrane panel may be shaped to have a concave-curved section.
  • FIG. 1 is a perspective view showing a metal membrane panel according to the present invention
  • FIG. 2 is a top plan view of the metal membrane panel of FIG.1 ;
  • FIG. 3 is an enlarged perspective view of the metal membrane panel of FIG. 1 ;
  • FIG. 4 is an enlarged top plan view of the metal membrane panel of ?F1G. 3;
  • FIG. 5 is an enlarged top plan view showing a connecting corrugation section of the metal membrane panel according to the present invention.
  • FIG. 6 is a cross-sectional view of the metal membrane panel according to the present invention.
  • FIG. 7 is a perspective view of the metal membrane panel according to the present invention, which is attached on a plywood;
  • FIG. 8 is a view showing a result of an elastic stress analysis of the metal m embrane panel according to the present invention.
  • FIG. 9 is a perspective view showing a conventional metal membrane panel.
  • ?F1G. 1 is a perspective view showing a metal membrane panel according to the present invention
  • ?F1G. 2 is a top plan view of the metal membrane panel of F1G.1
  • FIG. 3 is an enlarged perspective view of the metal membrane panel of FIG. 1
  • ?F1G. 4 is an enlarged top plan view of the metal membrane panel of ?F1G. 3
  • FIG. 5 is an enlarged top plan view showing a connecting corrugation section of the metal membrane panel according to the present invention
  • FIG. 6 is a cross-sectional view of the metal membrane panel according to the present invention
  • FIG. 7 is a perspective view of the metal membrane panel according to the present invention, which is attached on a plywood.
  • the metal membrane panel "A" includes a plurality of rectangular unit corrugations 10 w-hich enable low stress regions to be formed on inside and outside thereof, and a plurality of transverse corrugations 20 and a plurality of longitudinal corrugations 30, w-hich serves to connect the plurality of unit corrugations 10 to each other.
  • Each of the unit corrugations 10 is comprised of combination of longitudinal bulging portion 11 and transverse bulging portion 12 such that the longitudinal and transverse bulging portions 11 and 12 defines a rectangular bulging strip, as viewed frcm plan view, which is gently rounded at corners thereof.
  • the unit corrugations 10 are arranged to be spaced from each other by predetermined intervals.
  • the corners of the unit corrugations 10, at w-hich the longitudinal bulging portions 11 are connected to the transverse bulging portions 12, are gently curved, so as to disperse and alleviate stress concentrating on the corners and to allow an easy operation of manufacturing the metal membrane panel "A"
  • the unit corrugations 10 are constructed such that the unit corrugations 10 are positioned at points where the transverse corrugations 20 intersect the longitudinal corrugations 30. Consequently, low stress regions are formed inside and outside the unit corrugations 1Q More specifically, since an inside area of the unit corrugation 10 is smoothly curved at corners thereof, thereby defining a closed curve, the unit corrugation 10 enables a low stress to be distributed on the inside and outside areas thereof, which is equal to or less than 1/5 of the maxi ⁇ -un stress w-hich may otherwise occur at the intersection of the transverse and longitudinal corrugations 20 and 30.
  • the transverse and longitudinal corrugations 20 and 30 are comprised of transverse and longitudinal connecting corrugation sections 40 and 50, which are adapted to connect adjacent unit corrugations to each other, and transverse and longitudinal extending corrugation sections 60 and 60', which are extended to edges of the metal membrane panel "A" -from the longitudinal and transverse bulging portions 11 and 12 of the outermost unit corrugations 10 which are positioned adjacent to the edges of the metal membrane panel "A", respectively.
  • transverse and longitudinal connecting corrugation sections 40 and 50 and the transverse and longitudinal extending corrugation sections 60 and 60' are arranged such that the transverse connecting corrugation sections 40 are aligned with the transverse extending corrugation sections 60 and the longitudinal connecting corrugation sections 50 are aligned with the longitudinal extending corrugation sections 60'.
  • the unit corrugations 10, w-hich has low stress regions on inside and outside areas thereof, are provided at points where the transverse and longitudinal corrugations 20 and 30 intersect, a spacing between the adjacent transverse extending corrugation sections 60 and a spacing between the adjacent longitudinal extending corrugation sections 60' are increased.
  • the ntmber of the extending corrugation sections 60 and 60' formed on welding edges of the metal membrane panel "A" is reduced to about 1/2 of the ntmber of the corresponding corrugations of a conventional metal membrane panel, thereby enabling easy application of an automatic welding.
  • the unit corrugations 10, the transverse and longitudinal connecting corrugation sections 40 and 50, and the transverse and longitudinal extending corrugation sections 60 and 60' are shaped to have any of semicircular, elliptical and parabolic sections, and portions where the unit corrugations 10, the transverse and longitudinal connecting corrugation sections 40 and 50, and the transverse and longitudinal extending corrugation sections 60 and 60' are connected to a flat surface of the metal membrane panel "A" are shaped to have a concave-curved section.
  • the transverse and longitudinal connecting corrugation sections 40 and 50 and the transverse and longitudinal extending corrugation sections 60 and 60' are continuously increased toward junction portions 13 where the transverse and longitudinal connecting corrugation sections 40 and 50 and the transverse and longitudinal extending corrugation sections 60 and 60' are connected to the unit corrugations 1Q Accordingly, the transverse and longitudinal connecting corrugation sections 40 and 50 and the transverse and longitudinal extending corrugation sections 60 and 60' are shaped to have curved lines at the junction portions, as viewed frcm above, thereby preventing localized stress concentration and improving a workability of the metal membrane panel "A" ?In other words, the transverse and longitudinal connecting corrugation sections 40 and 50 are increased in width from the centers thereof toward the junction portions while forming gently curved outlines at the junction portions, and the transverse and longitudinal extending corrugation sections 60 and 60' are also increased in width from the edges of the metal membrane panel "A" toward the junction portions, as shown in ?F1G. 5.
  • the metal membrane panel "A” which is constructed in the above-described manner, is attached to an insulated wall to constitute an internal surface of an insulated ?LNG cargo tank.
  • the metal membrane panel "A” is placed on a plywood 70 such that the metal membrane panel “A” is positioned at metal attaching strips 71 which are arranged on the plywood 70 into a lattice pattern, as shown in ?F1G. 7.
  • the metal membrane panel “A” is joined to other adjacent metal membrane panels "A” by lap welding, thereby constructing a sealed wall.
  • the metal membrane panels "A", which placed on the plywood 70 are joined to each other by intermittent welding without additional joining devices, and then the resulting metal membrane panels "A” are attached to an insulated cargo tank.
  • ?F1G. 8 shows a result of an elastic stress analysis of the metal membrane panel according to the present invention.
  • an MSC/ NAST-RAN program is used, and an SUS304L stainless panel having a size length 3m x width lm is used.
  • ?F1G. 8 shows stress variations at various positions according to temperature variations frcm a room temperature to -162°C As seen in FIG. 8, curved and connected portions of the metal membrane panel exhibit the maxirmn stress while flat surface areas of the metal membrane panel exhibit relatively low stress.
  • the present invention provides a metal membrane panel of an insulated ?LNG cargo tank, in which a plurality of unit rectangular corrugations, w-hich are shaped to have curved corners, are arranged on the metal membrane panel at predetermined intervals such that the unit rectangular corrugations are positioned at intersections of transverse and longitudinal corrugations and connected to them, and junctions of the unit corrugations and the transverse and longitudinal corrugations are shaped to have gently curved outlines, so as to alleviate stress concentration acting on the transverse and longitudinal corrugations and to facilitate a manufacturing operation of the metal membrane panel.
  • an insulated cargo tank which is ac-hieved by combination of the metal membrane panels, is improved in reliability.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

A metal membrane panel of an insulated LNG cargo tank, which has an improved stability by decreasing localized stress concentration areas, and which has an improved welding efficiency by reducing the number of corrugations on welding edges of adjacent metal membrane panel to reduce the number of curved portions to be welded. The metal membrane panel includes a plurality of rectangular unit corrugations (10) arranged on the panel (A) to be spaced from each other, each of the rectangular unit corrugations (10) being comprised of a pair of transverse bulging portions (12) and a pair of longitudinal bulging portions (11) and being shaped to have gently curved corners, transverse and longitudinal connecting corrugations (40, 50), which connect the plurality of rectangular unit corrugations (10) to each other, and transverse and longitudinal extending corrugations (60, 60'), which are extended to edges of the metal membrane panel (A) from the transverse and longitudinal bulging portions (12, 11) of the outermost unit corrugations (10).

Description

Description METAL MEMBRANE PANEL OF INSULATED LNG CARGO TANK Technical Field
[1] The present invention relates to a metal membrane panel of an insulated ? NG cargo tank, and, more particularly, to a metal membrane panel of an insulated ?LNG cargo tank, which includes a plurality of rectangular unit corrugations formed thereon, and transverse and longitudinal connecting corrugations which connect the rectangular unit corrugations to each other, so as to alleviate localized stress concentrations, and thus, to improve a functional stability.
[2] Background Art
[3] Generally, ? NG is extremely cold liquid having a boiling point of -162 °C, and is stored in an insulated cargo tank having a π-ultiple wall structure. To safely store ?LNG having a boiling point of -162 °C, the insulated cargo tank is comprised of an internal tank wall made of a metal membrane panel and an externally insulated wall surrounding the internal tank wall. By such a miltiple wall configuration, it is possible to minimize an amount of vaporized gas due to heat infiltrated into the tank frcm the outside.
[4] Since the metal membrane panel comes into close contact with LNG in an extremely cold state, the metal membrane panel is made of metal material, such as alumnim alloy, Invar, and 9% nickel steel, wMch are considerably reduced in a low temperature brittleness to resist distortion due to heat s-hrinkage. Furthermore, the metal membrane panel includes a plurality of linear corrugations such that the metal membrane panel easily expands and contracts according to repetitive temperature variations and load variations of stored liquid.
[5] As shown in ?F1G. 9, a conventional metal membrane panel is shaped in a rectangular form by a thin metal plate, and is provided throughout area thereof with a plurality of longitudinal and transverse linear corrugations, to allow for the expansion and contraction according to variations in temperature and load. An inner wall of a conventional insulated ?LNG cargo tank is typically constructed by a plurality of such metal membrane panels. ?In an operation of coupling the metal membrane panels to each other, respective metal membrane panels are first overlapped at four edges thereof with edges of other adjacent metal membrane panels, and the overlapped edges of the metal membrane panels are welded by lap welding, thereby providing the resulting tank with airtightness. Disclosure of Invention Technical Problem
[6] Such a conventional metal membrane panel is constructed in such a way that a plurality of longitudinal linear corrugations and a plurality of transverse linear corrugations are crossed to form a plurality of intersections on the metal membrane panel. Since each of the intersections is provided with curved surfaces w-hich have a radius of curvature smaller than that of curved surfaces of the longitudinal and transverse linear corrugations, the intersections are easily subjected to a stress concentration. Furthermore, since the metal membrane panel has a relatively complicated configuration, an operation of constructing the metal membrane panel requires increased wor-king time and processing stages, thereby causing the production of the metal membrane panel to be costly. Further, when performing an operation of joining adjacent metal membrane panels to each other by lap welding, the large number of curved portions on a welding line of the metal membrane panel causes a welding efficiency to be lowered.
[7] Technical Solution
[8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a metal membrane panel of an insulated ?LNG cargo tank, which is improved in a stability in terms of stress by decreasing localized stress concentration areas, and which is also improved in a welding efficiency by reducing the ntmber of corrugations on overlapped welding edges of an adjacent metal membrane panel to reduce the number of curved portions to be welded.
[9] In order to accomplish the above object, the present invention provides a metal membrane panel of an insulated ?LNG cargo tank, which includes a plurality of rectangular unit corrugations arranged on the panel to be spaced from each other by predetermined intervals, each of the plurality of rectangular unit corrugations being comprised of a pair of transverse bulging portions and a pair of longitudinal bulging portions and being shaped to have gently curved corners, transverse and longitudinal connecting corrugations, w-hich connect the plurality of rectangular unit corrugations to each other, and transverse and longitudinal extending corrugation, w-hich are extended to the edges of the metal membrane panel from the transverse and longitudinal bulging portions of the outermost unit corrugations w-hich are positioned adjacent to the edges of the metal membrane panel.
[10] The transverse and longitudinal connecting corrugations may be increased in width frcm the centers thereof toward the unit corrugations, and the transverse and longitudinal extending corrugations may be increased in width from the edges of the metal membrane panel toward the unit corrugations.
[11] The unit corrugations, the transverse and longitudinal connecting corrugations, and the transverse and longitudinal extending corrugations may be shaped to have any of semicircular, elliptical and parabolic sections, and portions where the unit corrugations, the transverse and longitudinal connecting corrugations, and the transverse and longitudinal extending corrugations are connected to a flat surface of the metal membrane panel may be shaped to have a concave-curved section.
[12] Brief Description of the Drawings
[13] The above and other objects, features and other advantages of the present invention will be more clearly understood frcm the following detailed description taken in conjunction with the accompanying drawings, in which:
[14] ?F1G. 1 is a perspective view showing a metal membrane panel according to the present invention;
[15] FIG. 2 is a top plan view of the metal membrane panel of FIG.1 ;
[16] FIG. 3 is an enlarged perspective view of the metal membrane panel of FIG. 1 ;
[17] FIG. 4 is an enlarged top plan view of the metal membrane panel of ?F1G. 3;
[18] FIG. 5 is an enlarged top plan view showing a connecting corrugation section of the metal membrane panel according to the present invention;
[19] FIG. 6 is a cross-sectional view of the metal membrane panel according to the present invention;
[20] ?F1G. 7 is a perspective view of the metal membrane panel according to the present invention, which is attached on a plywood;
[21] ?F1G. 8 is a view showing a result of an elastic stress analysis of the metal m embrane panel according to the present invention; and
[22] ?F1G. 9 is a perspective view showing a conventional metal membrane panel.
[23] Best Mode for Carrying Out the Invention [24] This invention will be described in further detail by way of example with reference to the accompanying drawings.
[25] ?F1G. 1 is a perspective view showing a metal membrane panel according to the present invention, ?F1G. 2 is a top plan view of the metal membrane panel of F1G.1, FIG. 3 is an enlarged perspective view of the metal membrane panel of FIG. 1, ?F1G. 4 is an enlarged top plan view of the metal membrane panel of ?F1G. 3, FIG. 5 is an enlarged top plan view showing a connecting corrugation section of the metal membrane panel according to the present invention, FIG. 6 is a cross-sectional view of the metal membrane panel according to the present invention, and FIG. 7 is a perspective view of the metal membrane panel according to the present invention, which is attached on a plywood.
[26] As showing in the drawings, the metal membrane panel "A" according to the present invention includes a plurality of rectangular unit corrugations 10 w-hich enable low stress regions to be formed on inside and outside thereof, and a plurality of transverse corrugations 20 and a plurality of longitudinal corrugations 30, w-hich serves to connect the plurality of unit corrugations 10 to each other.
[27] Each of the unit corrugations 10 is comprised of combination of longitudinal bulging portion 11 and transverse bulging portion 12 such that the longitudinal and transverse bulging portions 11 and 12 defines a rectangular bulging strip, as viewed frcm plan view, which is gently rounded at corners thereof. The unit corrugations 10 are arranged to be spaced from each other by predetermined intervals. As mentioned above, the corners of the unit corrugations 10, at w-hich the longitudinal bulging portions 11 are connected to the transverse bulging portions 12, are gently curved, so as to disperse and alleviate stress concentrating on the corners and to allow an easy operation of manufacturing the metal membrane panel "A"
[28] The unit corrugations 10 are constructed such that the unit corrugations 10 are positioned at points where the transverse corrugations 20 intersect the longitudinal corrugations 30. Consequently, low stress regions are formed inside and outside the unit corrugations 1Q More specifically, since an inside area of the unit corrugation 10 is smoothly curved at corners thereof, thereby defining a closed curve, the unit corrugation 10 enables a low stress to be distributed on the inside and outside areas thereof, which is equal to or less than 1/5 of the maxiπ-un stress w-hich may otherwise occur at the intersection of the transverse and longitudinal corrugations 20 and 30.
[29] The transverse and longitudinal corrugations 20 and 30 are comprised of transverse and longitudinal connecting corrugation sections 40 and 50, which are adapted to connect adjacent unit corrugations to each other, and transverse and longitudinal extending corrugation sections 60 and 60', which are extended to edges of the metal membrane panel "A" -from the longitudinal and transverse bulging portions 11 and 12 of the outermost unit corrugations 10 which are positioned adjacent to the edges of the metal membrane panel "A", respectively. In this configuration, the transverse and longitudinal connecting corrugation sections 40 and 50 and the transverse and longitudinal extending corrugation sections 60 and 60' are arranged such that the transverse connecting corrugation sections 40 are aligned with the transverse extending corrugation sections 60 and the longitudinal connecting corrugation sections 50 are aligned with the longitudinal extending corrugation sections 60'.
[30] According to the present invention, since the unit corrugations 10, w-hich has low stress regions on inside and outside areas thereof, are provided at points where the transverse and longitudinal corrugations 20 and 30 intersect, a spacing between the adjacent transverse extending corrugation sections 60 and a spacing between the adjacent longitudinal extending corrugation sections 60' are increased. C nsequently, the ntmber of the extending corrugation sections 60 and 60' formed on welding edges of the metal membrane panel "A" is reduced to about 1/2 of the ntmber of the corresponding corrugations of a conventional metal membrane panel, thereby enabling easy application of an automatic welding.
[31] As shown in ?F1G. 6, the unit corrugations 10, the transverse and longitudinal connecting corrugation sections 40 and 50, and the transverse and longitudinal extending corrugation sections 60 and 60' are shaped to have any of semicircular, elliptical and parabolic sections, and portions where the unit corrugations 10, the transverse and longitudinal connecting corrugation sections 40 and 50, and the transverse and longitudinal extending corrugation sections 60 and 60' are connected to a flat surface of the metal membrane panel "A" are shaped to have a concave-curved section.
[32] Widths of the transverse and longitudinal connecting corrugation sections 40 and 50 and the transverse and longitudinal extending corrugation sections 60 and 60' are continuously increased toward junction portions 13 where the transverse and longitudinal connecting corrugation sections 40 and 50 and the transverse and longitudinal extending corrugation sections 60 and 60' are connected to the unit corrugations 1Q Accordingly, the transverse and longitudinal connecting corrugation sections 40 and 50 and the transverse and longitudinal extending corrugation sections 60 and 60' are shaped to have curved lines at the junction portions, as viewed frcm above, thereby preventing localized stress concentration and improving a workability of the metal membrane panel "A" ?In other words, the transverse and longitudinal connecting corrugation sections 40 and 50 are increased in width from the centers thereof toward the junction portions while forming gently curved outlines at the junction portions, and the transverse and longitudinal extending corrugation sections 60 and 60' are also increased in width from the edges of the metal membrane panel "A" toward the junction portions, as shown in ?F1G. 5.
[33] In application, the metal membrane panel "A" according to the present invention, which is constructed in the above-described manner, is attached to an insulated wall to constitute an internal surface of an insulated ?LNG cargo tank. At this point, the metal membrane panel "A" is placed on a plywood 70 such that the metal membrane panel "A" is positioned at metal attaching strips 71 which are arranged on the plywood 70 into a lattice pattern, as shown in ?F1G. 7. The metal membrane panel "A" is joined to other adjacent metal membrane panels "A" by lap welding, thereby constructing a sealed wall. At this time, the metal membrane panels "A", which placed on the plywood 70, are joined to each other by intermittent welding without additional joining devices, and then the resulting metal membrane panels "A" are attached to an insulated cargo tank.
[34] ?F1G. 8 shows a result of an elastic stress analysis of the metal membrane panel according to the present invention. In performing t-his elastic stress analysis, an MSC/ NAST-RAN program is used, and an SUS304L stainless panel having a size length 3m x width lm is used. ?F1G. 8 shows stress variations at various positions according to temperature variations frcm a room temperature to -162°C As seen in FIG. 8, curved and connected portions of the metal membrane panel exhibit the maxirmn stress while flat surface areas of the metal membrane panel exhibit relatively low stress.
[35] Industrial Applicability
[36] As described above, the present invention provides a metal membrane panel of an insulated ?LNG cargo tank, in which a plurality of unit rectangular corrugations, w-hich are shaped to have curved corners, are arranged on the metal membrane panel at predetermined intervals such that the unit rectangular corrugations are positioned at intersections of transverse and longitudinal corrugations and connected to them, and junctions of the unit corrugations and the transverse and longitudinal corrugations are shaped to have gently curved outlines, so as to alleviate stress concentration acting on the transverse and longitudinal corrugations and to facilitate a manufacturing operation of the metal membrane panel. C nsequently, an insulated cargo tank, which is ac-hieved by combination of the metal membrane panels, is improved in reliability. Furthermore, since the ntmber of corrugations formed on edge areas of the metal membrane panels to be welded is decreased, weldability is improved during a welding process. [37] Although the preferred embodiment of the present invention has been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing frcm the scope and spirit of the invention as disclosed in the accompanying claims.

Claims

Claims
[1] 1. A metal membrane panel of an insulated ?LNG cargo tank, comprising: a plurality of rectangular unit corrugations arranged on the panel to be spaced from each other by predetermined intervals, each of the plurality of rectangular unit corrugations being comprised of a pair of transverse bulging portions and a pair of longitudinal bulging portions and being shaped to have gently curved corners; transverse and longitudinal connecting corrugations, which connect the plurality of rectangular unit corrugations to each other; and transverse and longitudinal extending corrugation, w-hich are extended to edges of the metal membrane panel from the transverse and longitudinal bulging portions of the outermost unit corrugations w-hich are positioned adjacent to the edges of the metal membrane panel. 2 The metal membrane panel as set forth in claim 1, wherein the transverse and longitudinal connecting corrugations are increased in width from the centers thereof toward the unit corrugations, and the transverse and longitudinal extending corrugations are increased in width frcm the edges of the metal membrane panel toward the unit corrugations. 3. The metal membrane panel as set forth in claim 1 or 2, wherein the unit corrugations, the transverse and longitudinal connecting corrugations, and the transverse and longitudinal extending corrugations are shaped to have any of semicircular, elliptical and parabolic sections, and portions where the unit corrugations, the transverse and longitudinal connecting corrugations, and the transverse and longitudinal extending corrugations are connected to a flat surface of the metal membrane panel are shaped to have a concave-curved section.
PCT/KR2004/003028 2004-03-30 2004-11-23 Metal membrane panel of insulated lng cargo tank WO2005095234A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2007506068A JP4564051B2 (en) 2004-03-30 2004-11-23 LNG storage tank membrane metal panel
EP04808205A EP1732828B1 (en) 2004-03-30 2004-11-23 Metal membrane panel of insulated lng cargo tank

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2004-0021526 2004-03-30
KR1020040021526A KR100707675B1 (en) 2004-03-30 2004-03-30 Membrane Metal Panel of Insulated LNG Tank

Publications (1)

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WO2005095234A1 true WO2005095234A1 (en) 2005-10-13

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JP (1) JP4564051B2 (en)
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KR102201249B1 (en) * 2013-09-06 2021-01-11 대우조선해양 주식회사 Membrane panel of membrane type tank for cryogenic fluid storage
CN112145954B (en) * 2020-09-21 2022-04-26 浙江振申绝热科技股份有限公司 Tank bottom structure of metal inner tank of membrane type low-temperature storage tank
CN117718755B (en) * 2024-02-18 2024-06-21 中太能源科技(上海)有限公司 Processing system of metal plate

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US3510278A (en) * 1963-06-27 1970-05-05 Technigaz Wall corner construction
JPS5578895A (en) 1978-12-12 1980-06-13 Kawasaki Heavy Ind Ltd Membrane structure of low temperature liquid tank
JPS5582898A (en) 1978-12-13 1980-06-21 Kawasaki Heavy Ind Ltd Joint structure in low temperature storage tank
KR950033234A (en) * 1994-05-28 1995-12-22 박청부 Membrane Structure for LNG Tank and Manufacturing Method
KR19980067005A (en) * 1997-01-30 1998-10-15 유상부 Membrane Corrugation Structure of Low Temperature Liquid Storage Tank

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NL297976A (en) * 1963-05-06
JPS4111104Y1 (en) * 1965-08-02 1966-05-24
JPS4935060U (en) * 1972-06-28 1974-03-28
JPS5754797A (en) * 1980-09-12 1982-04-01 Kawasaki Heavy Ind Ltd Construction of membrane tank
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US3510278A (en) * 1963-06-27 1970-05-05 Technigaz Wall corner construction
JPS5578895A (en) 1978-12-12 1980-06-13 Kawasaki Heavy Ind Ltd Membrane structure of low temperature liquid tank
JPS5582898A (en) 1978-12-13 1980-06-21 Kawasaki Heavy Ind Ltd Joint structure in low temperature storage tank
KR950033234A (en) * 1994-05-28 1995-12-22 박청부 Membrane Structure for LNG Tank and Manufacturing Method
KR19980067005A (en) * 1997-01-30 1998-10-15 유상부 Membrane Corrugation Structure of Low Temperature Liquid Storage Tank

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Also Published As

Publication number Publication date
JP2007530892A (en) 2007-11-01
EP1732828B1 (en) 2010-02-10
KR20050096357A (en) 2005-10-06
EP1732828A4 (en) 2008-03-26
JP4564051B2 (en) 2010-10-20
EP1732828A1 (en) 2006-12-20
KR100707675B1 (en) 2007-04-13

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