KR20170099008A - Primary barrier of cargo and cargo using the same - Google Patents

Primary barrier of cargo and cargo using the same Download PDF

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Publication number
KR20170099008A
KR20170099008A KR1020160020416A KR20160020416A KR20170099008A KR 20170099008 A KR20170099008 A KR 20170099008A KR 1020160020416 A KR1020160020416 A KR 1020160020416A KR 20160020416 A KR20160020416 A KR 20160020416A KR 20170099008 A KR20170099008 A KR 20170099008A
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KR
South Korea
Prior art keywords
membrane
barrier
intersection
auxiliary
wrinkle
Prior art date
Application number
KR1020160020416A
Other languages
Korean (ko)
Inventor
이재훈
송길달
Original Assignee
삼성중공업 주식회사
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Priority to KR1020160020416A priority Critical patent/KR20170099008A/en
Publication of KR20170099008A publication Critical patent/KR20170099008A/en

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    • 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
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/001—Thermal insulation specially adapted for cryogenic vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C3/00—Vessels not under pressure
    • F17C3/02—Vessels not under pressure with provision for thermal insulation
    • F17C3/025—Bulk storage in barges or on ships
    • F17C3/027—Wallpanels for so-called membrane tanks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/03—Thermal insulations
    • F17C2203/0304—Thermal insulations by solid means
    • F17C2203/0358—Thermal insulations by solid means in form of panels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0612—Wall structures
    • F17C2203/0626—Multiple walls
    • F17C2203/0631—Three or more walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • 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
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0146—Two-phase
    • F17C2225/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2225/0161—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
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/03—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the pressure level
    • F17C2225/033—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

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

Abstract

According to the present invention, a barrier comprises: a main membrane having a plane unit, a corrugation unit forming corrugations in the plane unit, and a cross unit where the corrugation units cross in different directions; and an auxiliary membrane bonded to the main membrane while covering a lower portion of the cross unit. The present invention prevents leakage of liquefied gas even if there is damage to the main membrane.

Description

{PRIMARY BARRIER OF CARGO AND CARGO USING THE SAME}

The present invention relates to a barrier of a cargo hold, and more particularly, to a barrier installed in a cargo hold including a two-layered insulating panel assembly.

Liquefied gas is a liquid made by cooling or compressing gas, and consumption of liquefied gas such as Liquefied Natural Gas (LPG) or LPG (Liquefied Petroleum Gas) is rapidly increasing worldwide.

Liquefied natural gas (LNG), which is an example of liquefied gas, refers to a colorless transparent cryogenic liquid with a volume of methane-based natural gas cooled by -162 ° C to reduce its volume by 1 / Efficient transportation method has been examined so that it can be mass-shipped from the production base to the destination of the demand site. As part of this effort, a liquefied natural gas transport vessel capable of transporting large volumes of liquefied natural gas to sea was developed.

The liquefied natural gas transportation vessel must have a cargo which can store and store the liquefied natural gas liquefied at a cryogenic temperature.

That is, since the liquefied natural gas has a higher vapor pressure than the atmospheric pressure and has a boiling temperature of about -162 ° C., in order to safely store and store such liquefied natural gas, the cargo window storing the liquefied natural gas is a material which can withstand extremely low temperatures, It should be made of aluminum steel, stainless steel, 35% nickel steel, etc. It should be designed with a unique insulation panel structure which is resistant to other thermal stress and heat shrinkage and prevents heat intrusion. Such a cargo hold of a liquefied natural gas transportation vessel can be divided into a self-supporting type and a membrane type depending on its structure. Among the membrane type, for example, Korean Patent Laid-Open Publication No. 10-2012-0013233 Feb. 14, 2012) discloses a liquefied natural gas storage tank and a method of manufacturing the same.

On the other hand, such a storage tank needs to prevent leakage of liquefied gas due to fatigue failure of the membrane. It has been proven in many experiments that fatigue failure propagates primarily to the surrounding area after the initial occurrence at the curved intersection of the bulkhead. Membrane damage caused by this fatigue failure is due to the presence of the liquefied gas Which results in deterioration of the heat insulating performance of the heat insulating wall, and it is necessary to prevent this.

Korean Published Patent Application No. 10-2012-0013233 (2012.02.14.)

It is an object of the present invention to provide a barrier capable of preventing leakage of liquefied gas even when the main membrane is damaged, and a liquefied gas holding window using the same.

According to an aspect of the present invention, there is provided a main membrane including a flat portion, a wrinkle portion forming a wrinkle on the flat portion, and an intersection portion formed by intersecting the wrinkle portions formed in different directions. And a secondary membrane covering the lower portion of the intersection and being joined to the primary membrane.

In addition, the auxiliary membrane may form a closed space between the auxiliary membrane and the intersection.

The auxiliary membrane may include an uneven surface having a shape corresponding to the corrugation of the main membrane at a lower portion of the intersection and a joint surface provided at a rim of the uneven surface and joined to the main membrane, The portion may be provided between the uneven surface and the intersection.

In addition, the auxiliary membrane may be bonded to the main membrane through the bonding surface in a welding or adhesive manner.

In addition, the bonding surface may be circular.

In addition, the auxiliary membrane may be a relatively thin thin plate as compared with the main membrane.

According to another aspect of the present invention, there is provided a liquefied gas holding window including a barrier according to any one of claims 1 to 6 and an insulating panel assembly stacked below the barrier.

The barrier wall of the cargo hold according to the present invention has an auxiliary membrane located below the intersection so that it is advantageous in that even when the liquefied gas flows out due to the damage of the intersection, have.

In addition, the barrier of the cargo hold according to the present invention allows the auxiliary membrane to form a sealing structure together with the intersection, thereby effectively delaying / blocking the outflow of the liquefied gas to the adiabatic panel, which may be caused by the damage of the intersection.

In addition, the barrier of the cargo hold according to the present invention can be constructed in the form of a thin plate or a film type, so that the auxiliary membrane can perform the same function without the increase in manufacturing cost and the ease of construction.

In addition, the auxiliary membrane is provided in a relatively thin thin plate as compared with the main membrane, and the existing construction method can be used as it is.

In addition, the auxiliary membrane is provided in a circular or elliptical shape with no junction point, so that adhesion failure can be minimized, and the auxiliary membrane can be attached to the main membrane with a large binding force.

1 is a side sectional view showing a structure of a cargo hold including a barrier according to a first embodiment of the present invention.
2 is a perspective view of a cargo hold including a barrier according to the first embodiment of the present invention.
3 is an enlarged view of a portion A in Fig.
4 is a cross-sectional view of BB of Fig.
5 is a cross-sectional view of CC of Fig.
6 is a rear perspective view corresponding to the perspective view of FIG.
7 is a perspective view of the auxiliary membrane according to the first embodiment of the present invention.
8 is a rear view of a barrier according to the first embodiment of the present invention.
9 is a rear view of a barrier according to a second embodiment of the present invention.
10 is a rear view of a barrier according to a third embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below are provided by way of example so that those skilled in the art will be able to fully understand the spirit of the present invention. The present invention is not limited to the embodiments described below and may be embodied in other forms. In order to clearly explain the present invention, parts not related to the description are omitted from the drawings, and the width, length, thickness, etc. of the components may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

1 is a side sectional view showing a structure of a cargo hold including a barrier 10, 30 according to a first embodiment of the present invention. Referring to this, a liquefied gas holding window according to an embodiment of the present invention can be used to store and / or transport cryogenic liquefied gas. The liquefied gas is made of liquid by cooling or compressing the gas, and includes liquefied natural gas (LNG), liquefied petroleum gas (LPG), and dimethyl ether (DME). Hereinafter, a cargo window of a liquefied natural gas (LNG) transportation vessel will be described as an example.

Referring to the drawings, a cargo hold of a liquefied gas transportation vessel encloses a space capable of accommodating liquefied gas and includes a primary barrier 10 in direct contact with the liquefied gas, a primary barrier 10 surrounding the primary barrier 10, A secondary barrier 30 surrounding the upper insulating wall 20 to prevent leakage of the LNG due to breakage of the primary barrier 10, And a lower heat insulating wall 40 surrounding the outer wall 50. [ Hereinafter, each constitution of the cargo hold will be described one by one.

First, the primary barrier 10 is for sealing the storage space in which the storage fluid is received. For this purpose, the primary barrier 10 requires airtightness. Since the liquefied gas can be maintained at a cryogenic temperature below the boiling point, it is usually stored in a liquid state. However, depending on the change of temperature or pressure, vaporization of some liquefied gas may occur, and the pressure inside the cargo hold increases greatly. When the primary barrier 10 penetrates due to such an increase in pressure or the like, the liquid or gaseous liquefied gas can be introduced into the upper insulating wall 20. As the temperature of the introduced liquefied gas increases, the volume of the liquefied gas expands and damages the upper heat insulating wall 20. Therefore, the airtightness of the primary barrier 10 is treated as very important. The barriers 10, 30 including the primary barriers 10 will be described later in detail with reference to other drawings.

The heat insulating walls 20 and 40 may have a double structure including an upper insulating wall 20 and a lower insulating wall 40 for the purpose of improving heat insulation performance and ease of repair. At this time, the heat insulating walls 20 and 40 are made of heat insulating panels 21 and 41 (for example, polyurethane foam, polyurethane foam, reinforced polyurethane foam, or Reinforced PUF) So that the hull can be protected from the fluid at a cryogenic temperature.

The upper insulating wall 20 is interposed between the primary barrier 10 and the secondary barrier 30 to insulate the liquefied gas stored inside the cargo hold from the outside. The upper insulating wall 20 includes an upper insulating panel 21, a first reinforcing panel 22 and a second reinforcing panel 23, which are largely made of heat insulating material.

A first reinforcing panel 22 and a second reinforcing panel 23 may be provided on the upper and lower portions of the upper insulating panel 21, respectively. The first reinforcing panel 22 and the second reinforcing panel 23 reinforce the upper heat insulating panel 21 and may be plywood and may be formed of an adhesive such as an epoxy glue or the like, ). ≪ / RTI >

The first reinforcing panel 22 can easily fix the upper insulating wall 20 to the secondary wall 30 instead of the upper insulating panel 21 having a relatively low rigidity. The second reinforcing panel 23 is provided between the primary barrier 10 and the upper insulating wall 20 so that the primary barrier 10 can be easily installed and secured by using coupling members Can be firmly fixed.

The secondary barrier 30 is interposed between the primary barrier 10 and the upper and lower thermal insulation panels 21 and 22 to prevent leakage of fluid stored in the interior of the cargo hold. Metal materials such as INVAR, stainless steel (SUS), or aluminum alloy may be used for the airtightness (or watertightness) of the secondary barrier 30, and a rigid triplex, And a supple triplex may be used.

The secondary barrier 30 is provided between the upper insulating wall 20 and the lower insulating wall 40 so as to protect the lower insulating wall 40 even when the primary barrier 10 is penetrated. Therefore, since only the upper heat insulating wall 20 needs to be repaired even when the LNG is leaked, the time and cost required for the repair can be greatly reduced.

The lower insulation wall 40 can allow the fluid stored inside the cargo hold to be insulated from the outside between the ship outer wall 50 and the secondary barrier 30. The lower thermal insulation wall 40 is adhered to the outer wall 50 by a mastic or the like so as to alleviate the impact when the thermal insulation wall 40 is coupled with the upper insulation wall 20, Can be reduced. Further, the lower heat insulating wall 40 can be joined by various fixing members including the outer wall 50 and the stud bolts 52 and the like. The lower heat insulating wall body 40 mainly includes a lower heat insulating panel 41, a first reinforcing panel 42 and a second reinforcing panel 43, which will be described below in order.

The second reinforcing panel 43 may serve to facilitate fixing of the secondary barrier 30 on the upper side of the lower heat insulating wall 40 instead of the lower heat insulating panel 41 having a relatively low rigidity. The first reinforcing panel 42 is provided between the lower heat insulating wall 40 and the outer wall 50 so that the outer wall 50 and the lower heat insulating wall 40 can be firmly coupled to each other. At this time, the outer wall 50 supports the load of the storage fluid and may be an inner hull.

In the related art, the heat insulating walls 20 and 40 and the barriers 10 and 30 are connected to each other by using an adhesive. In this case, adhesion failure is likely to occur due to thermal stress. Therefore, when joining the walls 10, 30 with the insulating walls 20, 40 by using welding or mechanical bonding with or without bonding, the fixing of the walls 10, 30 can be made more rigid have.

FIG. 2 is a perspective view of a cargo hold including a primary barrier 10 according to a first embodiment of the present invention, and FIG. 3 is an enlarged view of a portion A of FIG. Referring to this, the primary barrier 10 according to the first embodiment of the present invention may be formed by combining a plurality of barrier sheets, and a welding method may be used to maintain airtightness. The primary barrier 10 includes a first wrinkle portion 111 and a second wrinkle portion 112 arranged in different directions so as to facilitate contraction or extension due to thermal deformation while maintaining airtightness, And may include intersecting intersection 120.

The primary barrier 10 is directly exposed to the temperature change of the storage space as a portion in contact with cryogenic liquefied gas. As the primary barrier 10 repeats thermal shrinkage and thermal expansion, fatigue accumulates and breaks, or the welded portion may be broken when heat shrinkage occurs.

Because of this problem, the barriers 10, 30 have a corrugation 110 to have an in-plane stiffness. The corrugated portion 110 is deformed by a certain amount when heat shrinkage occurs, thereby reducing thermal stress at the welded portion. For example, the thermal stress acting in the plane direction of the barrier 30 can be relieved by the wrinkles 110 in both directions. That is, since the wrinkles 111 and 112 have room for deformation in the width direction, they can cope with thermal stress. The thermal stress acting in the longitudinal direction of the first wrinkle portion 111 is canceled by the elasticity of the second wrinkle portion 112 and the thermal stress acting in the longitudinal direction of the second wrinkle portion 112 is equal to the thermal stress acting in the longitudinal direction of the first wrinkle portion 111, Can be solved by the elasticity of the elastic member 111.

FIG. 4 is a cross-sectional view taken along line BB of FIG. 3, FIG. 5 is a cross-sectional view of CC of FIG. 3, FIG. 6 is a rear perspective view corresponding to a perspective view of FIG. 8 is a rear view of a barrier 10, 30 according to a first embodiment of the present invention. Hereinafter, with reference to the drawings, the description will be made in detail with reference to the primary barrier 10 among the barriers 10, 30 forming the cargo hold.

The primary barrier 10 according to the first embodiment of the present invention mainly includes a main membrane 100 and a secondary membrane 200. The main membrane 100 includes a first wrinkle part 110 and a second wrinkle part 120 and an intersection part 130 to directly contact the liquefied gas in the cargo hold to form a hermetic structure, It is possible to delay the diffusion of the outflowed gas in the laminating portion of the upper insulating panel 21 when the gas or the liquefied gas in the tank flows out when the main membrane 100 is fatigued. The auxiliary barrier 30 may also be a dual structure of a primary membrane and a secondary membrane such as the primary barrier 10 where the diffusion of the liquefied gas in the lower insulation wall 40 may be delayed and blocked by the secondary membrane . Hereinafter, configurations of the main membrane 100 and the auxiliary membrane 200 will be described.

First, the main membrane 100 includes a planar portion 130, a wrinkle portion 110, and an intersection portion 120. The corrugated portion 110 may protrude toward the storage space and may have a shape such as a quadratic curve or a cubic curve. The round portion 131 may be formed at the intersection of the wrinkle portion 110 and the flat portion 130. The round portion 131 means that the corner where the two faces in different directions meet is processed into a gently curved surface without discontinuity. By providing the round portion 131 as described above, the corrugated portion 110 forms a structure that is easy to withstand fatigue failure even if thermal deformation continues.

The corrugated portion 110 includes a first corrugated portion 111 formed in a first direction and a second corrugated portion 112 formed perpendicularly to the first corrugated portion 111, 1 can be formed by the wrinkle portion 111 and the second wrinkle portion 112. [ Here, the first direction may be, for example, the longitudinal direction of the hull, and the second direction may be the width direction of the hull perpendicular to the first direction.

The auxiliary membrane 200 may be bonded to the underside of the main membrane 100. At this time, only the bonding surface 220 can be coupled to the main membrane 100 so that the uneven surface 210 of the auxiliary membrane 200 forms a space 210a with the main membrane 100. At this time, the space portion 210a is a closed space and prevents the leakage of the LNG stored in the cargo hold even if the primary barrier 10 is damaged by fatigue breakage or the like. In the case of a membrane used in a cargo hold, thermal stress corresponding to low-temperature LNG and fatigue performance due to hull deformation are important factors. It has been proven in various experiments that initial fatigue cracking (cracking) occurs and propagates, and the auxiliary membrane 200 is to delay / block the damage caused by the leakage of the liquefied gas at such an intersection 120.

The auxiliary membrane 200 may include an uneven surface 210 located under the intersection 120 and a bonding surface 220 provided on the rim of the uneven surface 210 and joined to the main membrane 100 . At this time, the uneven surface 210 may have a shape corresponding to the corrugated portion 110 of the main membrane 100. For example, if the corrugated portion 110 is a cross-shaped as shown in the figure, the uneven surface 210 also has a cross-shaped convex shape corresponding thereto.

The uneven surface 210 may form a closed space 210a. This prevents leakage of the liquefied gas to the heat insulating wall 20 when the intersection 120 is damaged, that is, when the intersection 120 is torn to leak the liquefied gas. At this time, the auxiliary membrane 200 may be bonded to the main membrane 100 through a bonding surface 220 by a welding method or a bonding method. This can achieve a complete sealing structure while helping the operator during the construction and manufacturing processes of the barriers 10, 30.

The barriers 10, 30 of the cargo hold according to the present invention may be combined with the above-described structures organically to produce the following effects. First, the auxiliary membrane 200 located under the intersection 120 is provided, so that even when the liquefied gas flows out due to the damage of the intersection 120, the outflow gas is quickly diffused into the heat insulating walls 20 and 40 There is an advantage that it can be delayed / blocked.

In addition, the auxiliary membranes 200 form a closed structure together with the intersections 120, so that the insulation of the liquefied gas, which may be generated by the damage of the intersection 120, It is possible to effectively delay / interrupt the outflow to the walls 20, 40.

In addition, the barriers 10, 30 of the cargo hold according to the present invention are manufactured in the form of a thin plate or a film so that the auxiliary membrane 200 can perform the same function without increasing the ease of construction and manufacturing cost have.

Further, the auxiliary membrane 200 may be a relatively thin thin plate compared to the main membrane 100, which has the advantage that the existing construction method can be used as it is. In addition, the auxiliary membrane 200 may be a laminated composite sheet (such as a glass fiber base) in a film form as well as a thin metal sheet, but is not limited thereto.

FIG. 9 is a rear view of a barrier according to a second embodiment of the present invention, and FIG. 10 is a rear view of a barrier according to the third embodiment. The auxiliary membrane 300 according to the second embodiment of the present invention includes an uneven surface 310 and an abutting surface 320. The abutting surface 320 forming the rim of the uneven surface 310 has an elliptical shape, Lt; / RTI > This has the advantage that the joining surface 320 has a gentle circular shape having no vertex, thereby improving the joining strength by welding or adhesive.

In addition, the auxiliary membrane 400 according to the third embodiment of the present invention includes the uneven surface 410 and the bonding surface 420, and the bonding surface 420 may be octagonal. It has a vertically joined surface on the corrugated portion 110 of the main membrane 100, which is a cross-shaped, and the internal angle is made obtuse, thereby minimizing the adhesion failure that may occur at the vertex.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, You will understand. Accordingly, the true scope of the invention should be determined only by the appended claims.

10: primary barrier 20: upper insulation wall
21: upper insulating panel 22: first reinforcing panel
23: second reinforcing panel 30: secondary barrier
40: lower insulating wall 41: lower insulating panel
42: first reinforcing panel 43: second reinforcing panel
50: outer wall 51: mastic
52: Stud bolt 100: Main membrane
110: wrinkle portion 111: first wrinkle portion
112: second wrinkle part 120: intersection part
130: plane portion 131: round portion
200: auxiliary membrane 210: uneven surface
210a: space portion 220: joint surface
300: auxiliary membrane 310: uneven surface
320: joint surface 400: auxiliary membrane
410: uneven surface 420: joint surface

Claims (7)

A main membrane including a planar portion, a wrinkle portion forming a wrinkle on the planar portion, and an intersection portion formed by intersecting the wrinkle portions formed in different directions; And
And a secondary membrane covering the lower portion of the intersection and bonded to the primary membrane. The method according to claim 1,
Wherein the auxiliary membrane forms a closed space between the intersection and the cargo hold. 3. The method of claim 2,
The auxiliary membrane
An uneven surface located at the lower portion of the intersection and having a shape corresponding to the wrinkle portion of the main membrane,
And a joint surface provided at an edge of the uneven surface and joined to the main membrane,
And the space portion is provided between the intersection portion and the uneven surface. The method of claim 3,
Wherein the abutment surface is a circular or oval barrier of the cargo hold. The method according to claim 1,
Wherein the thickness of the auxiliary membrane is thinner than that of the main membrane. The method according to claim 1,
Wherein the auxiliary membrane is a film of a laminate composite. Claims [1] - A barrier according to any one of claims 1 to 7,
And a heat insulating wall laminated below the barrier wall.
KR1020160020416A 2016-02-22 2016-02-22 Primary barrier of cargo and cargo using the same KR20170099008A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115892351A (en) * 2022-11-10 2023-04-04 沪东中华造船(集团)有限公司 Main shielding structure of MARKIII type containment system, liquid cargo tank and LNG ship
CN117053083A (en) * 2023-10-13 2023-11-14 沪东中华造船(集团)有限公司 Pressure-resistant low-temperature-resistant sealing film and enclosure system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115892351A (en) * 2022-11-10 2023-04-04 沪东中华造船(集团)有限公司 Main shielding structure of MARKIII type containment system, liquid cargo tank and LNG ship
CN115892351B (en) * 2022-11-10 2024-06-11 沪东中华造船(集团)有限公司 MARKIII type containment system's main shielding structure, cargo tank and LNG ship
CN117053083A (en) * 2023-10-13 2023-11-14 沪东中华造船(集团)有限公司 Pressure-resistant low-temperature-resistant sealing film and enclosure system
CN117053083B (en) * 2023-10-13 2024-01-02 沪东中华造船(集团)有限公司 Pressure-resistant low-temperature-resistant sealing film and enclosure system

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