KR101647459B1 - Membrane of tank for cryogenic fluid storage - Google Patents

Abstract

A membrane of a tank for storing a cryogenic fluid is disclosed. The membrane of the tank for storing a cryogenic fluid storage tank of the present invention is a membrane of a tank for storing a cryogenic fluid, First and second corrugations each extending in a transverse direction and a longitudinal direction on the base plate and spaced apart from each other; And a third corrugation which is formed on the base plate so as to be independent of the first and second corrugations, and which is disposed in such a manner as to reduce the thermal deformation stress in the diagonal direction.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a membrane of a cryogenic fluid storage tank,

The present invention relates to a membrane of a tank for storing a cryogenic fluid, and more particularly, it relates to a membrane capable of easily welding and processing by avoiding a complicated cross-wrinkle structure, and capable of reducing heat strain stress Lt; RTI ID = 0.0 > a < / RTI > cryogenic fluid storage tank.

Generally, Liquefied Natural Gas (LNG) is obtained by cooling natural gas at a cryogenic temperature of about -163 DEG C, and its volume is about 1/600 Which is suitable for long distance transportation through the sea.

(LNG Carrier), LNG RV (Regasification Vessel), LNG FPSO (Floating, Production, Storage and Offloading), LNG FSRU (Floating Storage and Regasification Unit ) Is provided with a storage tank (also referred to as a 'cargo window') made of a structure and material to withstand extremely low temperatures for storage of LNG.

Among the storage tanks of LNG, the membrane type storage tank is surrounded by the inner tank made of membrane metal panel so that the generation of vaporized gas due to the external penetration heat is minimized.

In addition, the membrane metal panel is made of a metal material resistant to low-temperature brittleness so as to be able to respond to the stress change by directly coming into contact with the cryogenic LNG. It meets a certain strength, It has a corrugation structure to facilitate shrinkage.

As a membrane of a conventional membrane type tank, there is a membrane metal panel of an LNG carrier insulation tank of Korean Patent Publication No. 10-2005-0050170. A plurality of transverse linear corrugations formed at equal intervals in parallel with each other on the membrane metal panel and having both ends connected to the flat section in a sector or semicircular shape by a finishing section; A plurality of longitudinal straight corrugations formed at equal intervals in parallel with each other and having both ends connected to the flat portion in a sector or semicircular shape by a finishing portion, And is configured to be straight welded by a planarized contact weld when overlapping and welding a single membrane metal panel and another single membrane metal panel.

However, the cross-sectional structure of the transverse linear corrugation and the longitudinal straight corrugation, which are formed so as to correspond to the bi-directional stress change due to thermal deformation, is complicated in the conventional membrane. This requires complicated processing including a number of forming processes and the like. Due to the necessity of complicated wrinkle structure and welding of the curved surface, it is difficult to manufacture, and it takes a lot of time and cost, I had a problem that caused it.

In addition, the conventional membrane has a limitation in that the effect of reducing the stress of thermal deformation is limited in that it corresponds to only the change of thermal deformation stress in both the lateral direction and the longitudinal direction.

Disclosure of the Invention The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a cryogenic fluid which satisfies the strength required to store a cryogenic fluid and the reduction of thermal deformation stress while avoiding a complicated cross- And it is an object of the present invention to improve the productivity and the manufacturing cost by automating the welding and improving the welding quality and the welding speed.

According to an aspect of the present invention, there is provided a membrane of a tank for storing a cryogenic fluid, comprising: a base plate; First and second corrugations each extending in the transverse direction and the longitudinal direction and spaced apart from each other; And a third corrugation formed on the base plate so as to be independent of the first and second corrugations, the third corrugation being disposed in a manner to reduce the stresses of thermal deformation in the diagonal direction .

Each of the first and second corrugations may be divided into a plurality of divided corrugations each extending from the center of the base plate to an edge of the base plate.

The divided corrugation may be formed to be arranged in a line between the third corrugations.

The divided corrugations may be formed to be shifted from each other so as to be located around the third corrugation.

The third corrugation may be formed in a rhombic shape in which each side is divided by the first and second corrugations.

The third corrugation may include a plurality of curvature corrugations arranged in a circular shape at the center of the base plate.

The third corrugation may further include a dot corrugation formed at the center of the arrangement of the curvature corrugations.

The third corrugation may be formed in a hemispherical shape at the center of the base plate.

The third corrugation may be formed in a circular shape at the center of the base plate.

According to another aspect of the present invention, there is provided a membrane of a tank for storing a cryogenic fluid, comprising: a base plate; And first and second corrugations extending in the transverse direction and the longitudinal direction and spaced apart from each other, wherein a third corrugation independent of the first and second corrugations is formed on the base plate, There is provided a membrane of a tank for storing a cryogenic fluid which is formed so as to reduce thermal deformation stress even in the directions other than the transverse direction and the longitudinal direction.

According to the present invention, since the corrugation independent structure of the corrugated structure eliminates the complicated intersection of the corrugation, it satisfies the reduction of the strength required to store the cryogenic fluid and the stress of thermal deformation, But also to reduce heat deformation stress in various directions, and it is excellent in workability and requires flat welding, thereby realizing automatic welding, improvement of welding quality and welding speed, improvement of productivity and reduction of manufacturing cost .

1 is a perspective view showing a membrane of a tank for storing a cryogenic fluid according to a first embodiment of the present invention;
2 is a perspective view illustrating a membrane of a tank for storing a cryogenic fluid according to a second embodiment of the present invention;
3 is a perspective view showing a membrane of a tank for storing a cryogenic fluid according to a third embodiment of the present invention.
4 is a perspective view showing a membrane of a tank for storing a cryogenic fluid according to a fourth embodiment of the present invention;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, the following examples can be modified in various forms, and the scope of the present invention is not limited to the following examples.

1 is a perspective view showing a membrane of a tank for storing a cryogenic fluid according to a first embodiment of the present invention.

1, a membrane 100 of a tank for storing a cryogenic fluid according to a first embodiment of the present invention includes a base plate 110, a base plate 110, The first and second corrugations 120 and 130 formed so as to be spaced apart from each other and the first and second corrugations 120 and 130 independent of the first and second corrugations 120 and 130 in the base plate 110, And a third corrugation 140 that is formed to reduce the amount of water.

The membrane 100 of the tank for storing a cryogenic fluid according to the first embodiment of the present invention may be a cryogenic fluid such as LNGC (LNG Carrier) or LNG RV (Regasification Vessel), which corresponds to a ship or a floating ocean structure requiring storage of LNG, , LNG FPSO (Floating, Production, Storage and Offloading), and LNG FSRU (Floating Storage and Regulation Unit).

In addition, the membrane 100 of the tank for cryogenic fluid storage according to the first embodiment of the present invention includes an inner shell corresponding to an inner tank manufactured by itself, a heat insulating layer corresponding to a heat insulating box for reducing the influence of temperature difference, It can be applied to both of storage tanks for storing, supplying and transporting LNG including an outer shell made of a steel material for withstanding internal pressure. These also apply to the membranes of the cryogenic fluid storage tanks according to all the following embodiments.

The base plates 110 are arranged in a plurality of rows and are connected to each other by welding so as to have a three-dimensional structure, thereby forming an inner tank that directly contacts the cryogenic fluid such as LNG, etc., For example, stainless steel.

In addition, it can be made of a metal material resistant to low-temperature brittleness such as aluminum alloy or nickel alloy steel including Invar, and since the first to third corrugations 120, 130 and 140 are formed, And at the same time, expansion and contraction are facilitated with respect to repeated temperature changes and changes in the load of the cryogenic fluid.

The base plate 110 may have a square shape, for example, in a rectangular shape in order to increase the assemblability by minimizing restrictions on the arrangement and arrangement of the base plates.

The first and second corrugations 120 and 130 are connected to the first and second corrugations 120 and 130 of the other base plate 110 in a predetermined direction Alternately arranged in the transverse direction and the longitudinal direction, and can be connected by lapping welding in a plurality of assemblies.

The first and second corrugations 120 and 130 extend from the base plate 110 in the transverse and longitudinal directions, respectively, and are spaced apart from each other. Therefore, the first corrugation 120 is formed to extend in the transverse direction, thereby reducing the stress of thermal deformation with respect to the longitudinal direction. The second corrugation 130 is formed to extend in the longitudinal direction, The stress of deformation can be reduced.

Each of the first and second corrugations 120 and 130 may include a plurality of divided corrugations 121, 122, 131 and 132, which are divided from each other at the center of the base plate 110 and extend to the edge of the base plate 110.

Each of the divided corrugations 121, 122, 131 and 132 is formed such that the edge of the base plate 110 is opened to be connected to the divided corrugation of the other base plate, and the central portion of the base plate 110 is curved .

The third corrugation 140 may be formed on the base plate 110 so as to be separated from the first and second corrugations 120 and 130 by being separated from the first and second corrugations 120 and 130, The thermal deformation stress is reduced.

Here, the directions other than the horizontal direction and the vertical direction are not indefinite. In addition to the horizontal direction and the vertical direction, depending on the form and arrangement position of the third corrugation in the present embodiment, diagonal direction, horizontal direction (Or the longitudinal direction), and all the directions of 360 degrees.

The third corrugation 140 may be formed in a rhombic shape in which each side 141 is divided by the first and second corrugations 120 and 130 as in this embodiment. Therefore, the third corrugation 140 is formed to be inclined in the regions corresponding to the first to fourth quadrants divided by the first and second corrugations 120 and 130 in the base plate 110, . As a result, each side 141 of the third corrugation 140 is designed to reduce the thermal deformation stress in the respective X and Y directions in accordance with the direction in which it is disposed.

The first to third corrugations 120, 130 and 140 may be formed in the base plate 110 by a forming process.

2 is a perspective view showing a membrane of a tank for storing a cryogenic fluid according to a second embodiment of the present invention.

2, the membrane 200 of the tank for storing a cryogenic fluid according to the second embodiment of the present invention includes a base plate 210, a base plate 210, The first and second corrugations 220 and 230 formed to be spaced apart from each other and the first and second corrugations 220 and 230 are formed on the base plate 210 in a direction other than the transverse direction and the longitudinal direction, And a third corrugation 240 arranged in a manner to reduce the thermal deformation stress of the first corrugation.

Since these configurations are described in detail in the corresponding configuration of the membrane 100 of the tank for storing a cryogenic fluid according to the first embodiment of the present invention, only the difference therebetween will be described.

Each of the first and second corrugations 220 and 230 may be formed of a pair of divided corrugations 221, 222, 231 and 232. The divided corrugations 221, 222, 231, And may be formed to be aligned in a line with each other.

On the other hand, the divided corrugations 221, 222, 231, and 232 may be formed to be shifted from each other so as to be located around the third corrugation 240, unlike the present embodiment.

The third corrugation 240 may include a plurality of curvature corrugations 241 arranged in a circular shape at the center of the base plate 210 and may further include a plurality of curved corrugations 241, (242). ≪ / RTI >

In this way, the stress on the thermal deformation is reduced not only in the horizontal direction, the vertical direction, and the diagonal direction (XY direction) but also in various directions depending on the arrangement position and the arrangement direction of the curvature corrugation 241, 242 also reduce stresses to thermal deformation in various directions. Here, the dot corrugation 242 may be formed in a hemispherical shape having a relatively small diameter.

3 is a perspective view showing a membrane of a tank for storing a cryogenic fluid according to a third embodiment of the present invention.

3, the membrane 300 of the tank for storing a cryogenic fluid according to the third embodiment of the present invention extends in the lateral direction and the longitudinal direction respectively to the base plate 310 and the base plate 310, The first and second corrugations 320 and 330 formed to be spaced apart from each other and the first and second corrugations 320 and 330 are formed on the base plate 310 in a direction other than the transverse direction and the longitudinal direction, And a third corrugation 340 arranged in a manner to reduce the thermal deformation stress of the first corrugated part 340. [ Since these configurations are described in detail in the corresponding configuration of the membrane 100 of the tank for storing a cryogenic fluid according to the first embodiment of the present invention, only the difference therebetween will be described.

Each of the first and second corrugations 320 and 330 may be formed of a pair of divided corrugations 321,322,331 and 332. These divided corrugations 321,322,331 and 332 may be located around the third corrugation 340 as in this embodiment They can be formed to be shifted from each other.

On the other hand, the divided corrugations 321, 322, 331, and 332 may be formed to be arranged in a line between the third corrugations 340, unlike the present embodiment.

The third corrugation 340 may be formed in a hemispherical shape at the center of the base plate 310. Therefore, the third corrugation 340 in a hemispherical shape is used to reduce stresses against thermal deformation in various directions as well as in the lateral and longitudinal directions and in the diagonal directions (X and Y directions).

4 is a perspective view showing a membrane of a tank for storing a cryogenic fluid according to a fourth embodiment of the present invention.

4, the membrane 400 of the tank for storing a cryogenic fluid according to the fourth embodiment of the present invention extends in the lateral direction and the longitudinal direction respectively to the base plate 410 and the base plate 410, The first and second corrugations 420 and 430 formed to be spaced apart from each other and the first and second corrugations 420 and 430 are formed on the base plate 410 in a direction other than the transverse direction and the longitudinal direction, And a third corrugation 440 disposed in a manner to reduce the thermal deformation stress of the first corrugated sheet. Since these configurations are described in detail in the corresponding configuration of the membrane 100 of the tank for storing a cryogenic fluid according to the first embodiment of the present invention, only the difference therebetween will be described.

Each of the first and second corrugations 420 and 430 may be formed of a pair of divided corrugations 421, 422, 431 and 432. These divided corrugations 421, 422, 431 and 432 may be located around the third corrugation 440 They can be formed to be shifted from each other.

On the other hand, the divided corrugations 421, 422, 431, and 432 may be formed to be aligned in a line between the third corrugation 440, unlike the present embodiment.

The third corrugation 440 may be formed in a circular shape at the center of the base plate 410. Accordingly, the third corrugation 440 in a circular shape reduces stresses against thermal deformation not only in the horizontal and vertical directions, but also in diagonal directions (X and Y directions) as well as in various directions.

According to the membrane of the tank for storing a cryogenic fluid fluid according to the present invention, due to the independent structure of the corrugation constituting the corrugated structure, the complex intersection of the corrugation can be eliminated, and the strength required to store the cryogenic fluid and the stress Reduction can be satisfied.

In addition, it is possible to reduce the stress of thermal deformation in various directions as well as in the transverse direction and longitudinal direction, and is excellent in workability and requires flat welding, thereby realizing automatic welding, improving welding quality and welding speed, The cost can be reduced.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. It is.

110, 210, 310, 410:
120, 220, 320, 420:
121, 122, 221, 222, 321, 322, 421, 422:
130, 230, 330, 430:
131, 132, 231, 232, 331, 332, 431, 432:
140,240,340,440: Third coronation
141: Sides
241: Curvature corrugation
242: dot corrugation

Claims (10)

1. A membrane of a tank for storing a cryogenic fluid,
A base plate;
First and second corrugations each extending in the transverse direction and the longitudinal direction and spaced apart from each other; And
And a third corrugation that is formed on the base plate so as to be independent of the first and second corrugations and that is arranged in a manner to reduce the thermal deformation stress in the diagonal direction,
In the third corrugation,
A plurality of curvature corrugations arranged in a circular shape at the center of the base plate; And
Dot corrugation formed at the center of the arrangement of the curvature corrugations; / RTI >
Membrane of tank for cryogenic fluid storage. The method according to claim 1,
Wherein each of the first and second corrugations comprises:
And a plurality of divided corrugations each extending from the center of the base plate to an edge of the base plate. The method of claim 2,
In the split corrugation,
Wherein the third corrugations are arranged to be aligned with each other with the third corrugation interposed therebetween. The method of claim 2,
In the split corrugation,
And the second corrugation is formed to be offset from the third corrugation so as to be located around the third corrugation. delete delete delete delete delete delete

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