KR20160036406A - Metal membrane assembly for cryogenic liquid containment system and method for manufacturing the same - Google Patents

Metal membrane assembly for cryogenic liquid containment system and method for manufacturing the same Download PDF

Info

Publication number
KR20160036406A
KR20160036406A KR1020140128643A KR20140128643A KR20160036406A KR 20160036406 A KR20160036406 A KR 20160036406A KR 1020140128643 A KR1020140128643 A KR 1020140128643A KR 20140128643 A KR20140128643 A KR 20140128643A KR 20160036406 A KR20160036406 A KR 20160036406A
Authority
KR
South Korea
Prior art keywords
pressure
damping layer
supporting structure
metal membrane
pressure supporting
Prior art date
Application number
KR1020140128643A
Other languages
Korean (ko)
Other versions
KR101687604B1 (en
Inventor
이대길
이동영
최재헌
최일범
유영호
김기현
남수현
임준우
김민국
Original Assignee
한국과학기술원
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 한국과학기술원 filed Critical 한국과학기술원
Priority to KR1020140128643A priority Critical patent/KR101687604B1/en
Publication of KR20160036406A publication Critical patent/KR20160036406A/en
Application granted granted Critical
Publication of KR101687604B1 publication Critical patent/KR101687604B1/en

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/02—Wall construction
    • B65D90/06—Coverings, e.g. for insulating purposes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
    • F17C1/12—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge with provision for thermal insulation

Abstract

The present invention discloses a metal membrane assembly for a cryogenic liquid storage system for storing and transporting cryogenic liquids such as liquefied natural gas and a method of manufacturing the same. The metal membrane assembly of the present invention comprises a metal membrane having a plurality of wrinkles formed on its upper surface, and a pressure supporting structure mounted inside a plurality of wrinkles to support an external pressure applied to a plurality of wrinkles and having a lower surface opened. The manufacturing method of the present invention is characterized in that the material of the pressure supporting structure for supporting the external pressure is mounted in the cavity of the lower mold by being mounted in the corrugation of the metal membrane for the cryogenic liquid storage system, Or a material of the damping layer capable of attenuating vibrations and shocks is put into one or more of the above materials of the pressure supporting structure. The material of the pressure support structure and the material of the damping layer are pressed by the protrusions of the upper mold to form the pressure supporting structure and the damping layer, and the pressure supporting structure and the damping layer are separated from the cavity of the lower mold. According to the present invention, an open type pressure supporting structure is mounted in the corrugation of the metal membrane to support external pressure acting on the corrugation, thereby greatly improving the external pressure supporting performance and effectively damping vibrations and shocks to improve reliability. In addition, it can be easily produced by compression molding using a mold, and productivity can be improved.

Description

Technical Field [0001] The present invention relates to a metal membrane assembly for a cryogenic liquid storage system,

The present invention relates to a cryogenic liquid storage system, and more particularly, to a metal membrane assembly for a cryogenic liquid storage system for storing and transporting a cryogenic liquid such as liquefied natural gas and a method of manufacturing the same.

Cryogenic liquids such as Liquefied Natural Gas (LNG), Liquid Argon, Liquid Nitrogen, and Liquid Oxygen are used in storage systems with an insulating structure to minimize evaporative losses. Stored or transported. One example of a cryogenic liquid storage system is a cargo containment system for LNG carriers. Membrane type tanks with larger capacity and easier to manufacture than Spherical type tanks are preferred to store and transport cryogenic LNG at -165 ° C. The cold reserving system of the membrane type LNG carrier is composed of the gas transport system developed by the company Gaz Transport et technigaz (GTT, France) and the technigaz system Technigaz system is used. The Gaz Transport system is also referred to as GTT No96, and the Technigaz system is also referred to as the GTT Mark-III system.

On the other hand, the LNG cargo hold of the Technigaz system is disclosed in U.S. Patent No. 7,540,395 entitled " Sealed wall structure and tank furnished with such a structure ". The LNG carrier cargo holds are installed inside the inner hull which constitutes the LNG carrier and have a primary barrier, a primary panel, a primary insulation layer, a secondary barrier, a secondary insulation layer, And a secondary panel. The primary barrier is composed of a plurality of metal membranes having liquid tightness of LNG. The metal membranes are composed of a stainless steel sheet having corrugated corrugated shapes to absorb shrinkage and expansion due to thermal deformation. The boundaries of the metal membranes are welded together.

In the conventional metal membrane as described above, as the height of the corrugation increases, the amount of thermal stress generated in the welded portion of the metal membrane during thermal shrinkage decreases, but the outer pressure resisting capability of the corrugation decreases. Is lowered. Therefore, it is required to improve the external pressure supporting performance against the wrinkles of the metal membrane.

The present invention is to solve various problems of the conventional metal membrane. It is an object of the present invention to provide a new metal membrane assembly for a new ultra-low temperature liquid storage system capable of improving external pressure supporting performance on wrinkles and a method of manufacturing the same.

Another object of the present invention is to provide a metal membrane assembly for a cryogenic liquid storage system capable of effectively damping vibrations and shocks and improving reliability and a method of manufacturing the same.

It is a further object of the present invention to provide a metal membrane assembly for a cryogenic liquid storage system that can be easily manufactured by compression molding and a method of manufacturing the same.

According to an aspect of the invention, there is provided a metal membrane assembly for a cryogenic liquid storage system. The metal membrane assembly for a cryogenic liquid storage system according to the present invention comprises: a metal membrane having a plurality of corrugations formed on its upper surface; And a pressure support structure which is mounted in a plurality of corrugations so as to support an external pressure applied to the plurality of corrugations and whose lower surface is opened.

According to another aspect of the present invention, there is provided a method of manufacturing a metal membrane assembly for a cryogenic liquid storage system, the method comprising: placing a material of a pressure supporting structure for supporting an external pressure into a cavity of a metal mold for a cryogenic liquid storage system, ; Placing the material of the damping layer capable of damping vibrations and impacts between the cavity of the lower mold and the material of the pressure support structure or above one of the materials of the pressure support structure; Placing a material of the damping layer capable of damping vibrations and shocks on the material of the pressure supporting structure; Pressing the material of the pressure supporting structure and the material of the damping layer by the protrusions of the upper mold to form a pressure supporting structure and a damping layer; And separating the pressure support structure and the damping layer from the cavity of the lower mold.

A metal membrane assembly for a cryogenic liquid storage system and a method of manufacturing the same according to the present invention is characterized in that an open type pressure supporting structure is mounted in a corrugation of a metal membrane to support an external pressure acting on a corrugation, And the impact can be effectively damped to improve the reliability. In addition, it can be easily produced by compression molding using a mold, and productivity can be improved. Therefore, it can be usefully adopted for LNG cargo holds to store and transport LNG.

1 is a cross-sectional view illustrating a structure of a metal membrane assembly for a cryogenic liquid storage system according to an embodiment of the present invention, which is applied to an LNG carrier holding case.
2 is a cross-sectional view illustrating the structure of a metal membrane assembly for a cryogenic liquid storage system according to the present invention.
3 is a cross-sectional view illustrating a method of manufacturing the metal membrane assembly of FIG.
4 is a cross-sectional view of another embodiment of a metal membrane assembly for a cryogenic liquid storage system according to the present invention.
5 is a cross-sectional view illustrating a method of manufacturing the metal membrane assembly of FIG.
6 is a cross-sectional view illustrating another embodiment of a metal membrane assembly for a cryogenic liquid storage system according to the present invention.
7 is a cross-sectional view illustrating another embodiment of a metal membrane assembly for a cryogenic liquid storage system according to the present invention.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments with reference to the accompanying drawings.

Hereinafter, preferred embodiments of a metal membrane assembly for a cryogenic liquid storage system and a method of manufacturing the same according to the present invention will be described in detail with reference to the accompanying drawings.

1 and 2, a metal membrane assembly 10 according to one aspect of the present invention can be used to construct a primary barrier 20 of an LNG carrier hold, for example, as a cryogenic liquid storage system. The metal membrane (30) has a plurality of corrugations (32) molded to protrude from the surface to absorb shrinkage and expansion due to thermal deformation. The corrugation 32 has a channel 34 therein. The metal membrane 30 may be composed of a stainless steel sheet. For the construction of the primary barrier 20, the boundaries of the plurality of metal membranes 30 are welded.

The primary panel 40 is mounted on the back surface of the metal membrane 30 for the construction of the LNG carrier holding structure. The primary panel 40 may be constructed of a fiber, a fiber reinforced composite sheet, etc. A primary insulation layer 42 is mounted on the back surface of the primary panel 40. 1 The cold insulating layer 42 may be composed of a plurality of insulating foams, for example, a reinforced polyurethane foam reinforced with a polyurethane foam and a glass fiber.

The metal membrane assembly 10 according to the present invention is provided with a pressure resisting structure 50 mounted inside the corrugation 32 to support the external pressure exerted on the corrugation 32. An open end 52 is formed in the lower surface of the pressure support structure 50 to form a channel 54. In other words, the pressure support structure 50 is composed of an open curve having an open bottom in order to conform to the corrugation 32. The pressure support structure 50 supports external pressure applied to the pleats 32 to prevent deformation of the pleats 32, thereby improving reliability. The pressure support structure 50 may be composed of various materials such as a metal material, a polymer material, and a composite material. The metal material may be a sheet or a plate of aluminum, stainless steel, titanium or the like. The polymer material may be composed of polyester, epoxy, or polyurethane.

On the other hand, the composite material is composed of a fiber reinforced composite material. The fiber reinforced composite material is constituted by impregnating a plurality of reinforcing fibers into a matrix and curing the same. The reinforcing fiber may be composed of carbon fiber, glass fiber, aramid fiber, and the like. The matrix may be composed of various materials such as epoxy resin, polyester resin, phenolic resin, polypropylene, and polyethylene terephthalate (PET). The fiber reinforced composite material is stacked in multiple layers and consolidated and cured by compression molding, vacuum bag molding, sheet molding compound (SMC) .

As shown in Fig. 3, the pressure supporting structure 50 is integrally compression-molded by a mold 70 together with the metal membrane 30. The mold 70 includes a lower mold 72 having a semi-circular cavity 72a and an upper mold 74 having a semi-circular protrusion 74a. The corrugations 32 of the metal membrane 30 are turned upside down and put into the cavities 72a of the lower mold 72 for molding of the pressure supporting structure 50 and the material of the pressure supporting structure 50, Into the channel (34). When the fiber reinforced composite material is pressed by the protrusion 74a of the upper mold 74, the pressure supporting structure 50 is molded integrally with the metal membrane 30. [ In some embodiments, the lower and upper molds 72 and 74 may be pre-heated by operation of a heater for compression molding of the fiber-reinforced composite material.

4, a damping layer 60 is interposed between the inner surface of the corrugation 32 and the outer surface of the pressure support structure 50 to damp vibrations and shocks to the outer surface of the pressure support structure 50 Respectively. Since the damping layer 60 is attached to the outer surface of the pressure supporting structure 50, impact generated due to cavitation, sloshing, etc. of the LNG can be effectively damped.

As shown in Fig. 5, the pressure support structure 50 and the damping layer 60 are compression molded by a mold 70. Fig. A material of the damping layer 60, for example, a polymer material such as polyester or polyurethane is placed on the inner surface of the cavity 72a for molding the pressure supporting structure 50 and the damping layer 60, A stainless steel sheet is inserted into the surface of the pressure-supporting structure 50, for example, a metal material so as to be placed on the surface. At this time, the damping layer 60 may be composed of a polymer film or a sheet. When the fiber reinforced composite material and the polymer material are pressed by the protrusion 74a of the upper mold 74 after the polymer material and the metal material are put into the cavity 72a, The layer 60 is formed. In some embodiments, the pressure support structure 50 and the damping layer 60 may be integrally molded into the corrugations 32 of the metal membrane 30. [

6, a friction-reducing layer 80 is additionally formed on the surface of the damping layer 60. As shown in Fig. The friction reducing layer 80 prevents damage due to friction between the corrugations 32 and the damping layer 60. The friction reducing layer 80 can be formed with the damping layer 60 by inserting a material having a low coefficient of friction before putting the material of the damping layer 60 into the cavity 72a. In some embodiments, the pressure support structure 50, the damping layer 60, and the friction reducing layer 80 may be integrally molded within the corrugations 32 of the metal membrane 30. Further, the friction reducing layer 80 may be formed on the surface of the pressure supporting structure 50 instead of the damping layer 60. The friction reducing layer 80 may be composed of various thermoplastic resin particles or sheets of about 100 탆 in size, self-lubricating particles, and the like. The thermoplastic resin may be selected from the group consisting of polytetrafluorethylene (PTFE), polyetheretherketone (PEEK), polyethylene (PE), polystyrene (PS), polypropylene (PP), nylon Can be used. The self-lubricating particles may be fine carbon particles of nanometer or micrometer size, carbon nanotubes, graphite particles, molybdenum oxide (MoS 2 ), or the like.

Referring to FIG. 7, the metal membrane 30 according to the present invention further includes a vibration isolation structure 90 mounted on the inner surface of the pressure supporting structure 50. The vibration insulating structure 90 includes a convex portion 92 disposed inside the pressure support structure 50 and a wave portion 94 extending from both ends of the convex portion 92 to a sinusoidal wave Consists of. The vibration insulating structure 90 may be composed of a polymer material or a composite material. The vibration insulating structure 90 may be molded together with the pressure supporting structure 50, the damping layer 60, and the friction reducing layer 80. The vibration insulation structure 90 reduces shock and vibration similarly to the damping layer 60.

In addition, the corrugated portion 94 of the vibration insulating structure 90 prevents damage due to friction between the metal membrane 30 and the primary panel 40. When the pressure supporting structure 50 and the vibration insulating structure 90 are made of a material having a low stiffness such as a polymer material fabric or a glass fiber mat or the like, And the vibration isolation structure 90 can act as a thermal stress reducing layer to reduce thermal stress and improve the reliability of the LNG carrier hold.

Meanwhile, when the back surface of the metal membrane 30 is installed in contact with the surface of the primary panel 40, an incombustible gas such as nitrogen used for detecting the leakage of the LNG and preventing fire is formed in the corrugations 32 As shown in FIG. The corrugated portion 94 of the metal membrane assembly 10 according to the present invention provides a passageway through which the incombustible gas can flow between the metal membrane 30 and the primary panel 40. In this manner, the corrugated part 94 performs the function of the passage for the flow of the incombustible gas, thereby improving the safety.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: metal membrane assembly 20: primary barrier
30: metal membrane 32: pleats
40: primary panel 50: pressure support structure
52: open end 60: damping layer
70: mold 72: lower mold
74: Upper mold 80: Friction reducing layer
90: Vibration isolation structure 94:

Claims (11)

A metal membrane having a plurality of wrinkles formed on an upper surface thereof;
A pressure support structure mounted within the plurality of pleats to support an external pressure exerted on the plurality of pleats and having a lower surface open. The method according to claim 1,
Wherein a damping layer is interposed between the inner surface of the plurality of pleats and the outer surface of the pressure support structure to damp vibrations and impacts. 3. The method of claim 2,
Wherein a friction reducing layer is further formed on at least one of the pressure supporting structure and the damping layer so as to reduce friction with the plurality of wrinkles. 4. The method according to any one of claims 1 to 3,
Further comprising a vibration isolation structure mounted within the pressure support structure to damp vibrations and impacts. ≪ RTI ID = 0.0 > 11. < / RTI > 5. The method of claim 4,
Wherein the vibration insulating structure comprises a convex portion disposed inside the pressure supporting structure and a corrugated portion extending in a sinusoidal waveform to provide a passage for flowing the incombustible gas from both ends of the convex portion, Assembly. 5. The method of claim 4,
Wherein the pressure support structure, the damping layer, and the vibration isolation structure are integrally formed by compression molding. Placing the material of the pressure support structure in the cavity of the lower mold for supporting the external pressure by being mounted in the corrugation of the metal membrane for the cryogenic liquid storage system;
Placing a material of the damping layer capable of attenuating vibrations and impacts between the cavity of the lower mold and the material of the pressure supporting structure or at least one of the materials of the pressure supporting structure;
Pressing the material of the pressure supporting structure and the material of the damping layer with the projections of the upper mold to form a pressure supporting structure and a damping layer;
And separating the pressure support structure and the damping layer from the cavity of the lower mold. 8. The method of claim 7,
Further comprising the step of inserting a material of the friction reducing layer into the cavity of the lower mold so as to reduce friction with the plurality of wrinkles before the material of either the pressure supporting structure or the damping layer is put into the cavities of the lower mold. / RTI > 9. The method according to claim 7 or 8,
Further comprising the step of inserting a material for the damping vibration isolation structure of vibration and impact before pressing the material of the pressure support structure and the material of the damping layer by the protrusions of the upper mold, ≪ / RTI > 10. The method of claim 9,
Wherein the vibration insulating structure comprises a convex portion disposed inside the pressure supporting structure and a corrugated portion extending in a sinusoidal waveform to provide a passage for flowing the incombustible gas from both ends of the convex portion, ≪ / RTI > 9. The method according to claim 7 or 8,
Further comprising the step of reversing the corrugation of the metal membrane before putting the material of the pressure supporting structure and the damping layer into the cavity of the lower mold and inserting the corrugation of the metal membrane into the cavity of the lower mold. A method of manufacturing a membrane assembly.
KR1020140128643A 2014-09-25 2014-09-25 Metal membrane assembly for cryogenic liquid containment system and method for manufacturing the same KR101687604B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020140128643A KR101687604B1 (en) 2014-09-25 2014-09-25 Metal membrane assembly for cryogenic liquid containment system and method for manufacturing the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020140128643A KR101687604B1 (en) 2014-09-25 2014-09-25 Metal membrane assembly for cryogenic liquid containment system and method for manufacturing the same

Publications (2)

Publication Number Publication Date
KR20160036406A true KR20160036406A (en) 2016-04-04
KR101687604B1 KR101687604B1 (en) 2016-12-19

Family

ID=55799726

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020140128643A KR101687604B1 (en) 2014-09-25 2014-09-25 Metal membrane assembly for cryogenic liquid containment system and method for manufacturing the same

Country Status (1)

Country Link
KR (1) KR101687604B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210036943A (en) * 2018-07-26 2021-04-05 가즈트랑스포르 에 떼끄니가즈 Sealed insulated tank

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101086766B1 (en) * 2008-11-27 2011-11-24 삼성중공업 주식회사 Insulation structure of lng cargo
KR101393005B1 (en) * 2012-12-24 2014-05-12 한국과학기술원 Vibration isolation structure of cargo containment system for liquefied natural gas carrier

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101086766B1 (en) * 2008-11-27 2011-11-24 삼성중공업 주식회사 Insulation structure of lng cargo
KR101393005B1 (en) * 2012-12-24 2014-05-12 한국과학기술원 Vibration isolation structure of cargo containment system for liquefied natural gas carrier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210036943A (en) * 2018-07-26 2021-04-05 가즈트랑스포르 에 떼끄니가즈 Sealed insulated tank

Also Published As

Publication number Publication date
KR101687604B1 (en) 2016-12-19

Similar Documents

Publication Publication Date Title
KR101415899B1 (en) Cryogenic liquid containment system and cargo containment system for liquefied natural gas carrier using the same
KR101837032B1 (en) Structure for tank dome flange section
US5419139A (en) Composite cryogenic tank apparatus
KR101177904B1 (en) Cargo containment system for liquefied natural gas carrier
KR101088464B1 (en) Heat insulation structure and cryogenic liquid storage tank having the same
KR20060052601A (en) Sealed, thermally insulated tank with compression-resistant non-conducting elements
CN105443974A (en) Gas storage tank
KR20090094505A (en) Material corrugation to lng cargo
KR20100060348A (en) Insulation structure of lng cargo
KR101687604B1 (en) Metal membrane assembly for cryogenic liquid containment system and method for manufacturing the same
KR100924099B1 (en) Cargo containment system of lng ship and construction method thereof
JP5044310B2 (en) Low temperature liquefied gas storage tank
AU2014333649B2 (en) Self-supporting box for thermally insulating a fluid storage tank and method for producing such a box
KR101393005B1 (en) Vibration isolation structure of cargo containment system for liquefied natural gas carrier
KR101580912B1 (en) Insulation panel structure of cargo for liquefied gas
KR20110031613A (en) Heat insulation structure and cryogenic liquid storage tank having the same
KR101434150B1 (en) Cryogenic liquid storage tank with composite material reinforcement, composite material reinforcement and fabrication method of composite material reinforcement
KR20110133887A (en) Heat insulation structure for cryogenic liquid storage tank
JP2017075636A (en) Heat insulation panel for membrane-type liquefied gas tank heat insulation wall
KR101291126B1 (en) Insulation structure for pump tower of lng tank
KR101985211B1 (en) Liquefied gas storage tank and Ship or offshore structure including the same
CN205372059U (en) Gaseous storage jar
KR102469998B1 (en) Liquefied gas storage tank and vessel comprising the same
KR101571428B1 (en) Tank
KR20120013230A (en) Liquefied natural gas storage tank

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
AMND Amendment
E601 Decision to refuse application
AMND Amendment
X701 Decision to grant (after re-examination)
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20191126

Year of fee payment: 4