KR101965702B1 - Flow disturbance fin for cryogenic fluid and cryogenic fluid storage eqpuipment structure with the same - Google Patents

Abstract

A flow disturbance fin for an ultralow temperature fluid according to the present invention comprises a bimetal member, a first fixating unit, and a second fixating unit. The bimetal member is composed by the connection between a first metal plate and a second metal plate having a thermal expansion coefficient different from each other. The first metal plate having a thermal expansion coefficient lower than that of the second metal plate is situated to face a structure member. The first fixating unit is situated at an upper side of the first metal plate so as to fixate an upper side of the bimetal member at the structure member, and maintains fixation power when coming in contact with the ultralow temperature fluid. The second fixating unit is situated at a lower side of the first metal plate so as to fixate a lower side of the bimetal member at the structure member, and loses fixation power when coming in contact with the ultralow temperature fluid.

Description

TECHNICAL FIELD [0001] The present invention relates to a flow disturbance pin for a cryogenic fluid and a structure for a cryogenic fluid storage facility having the same,

The present invention relates to a structure for a cryogenic fluid storage facility, and more particularly to a flow-impeding pin that prevents cryogenic fluid leaking from a storage tank from moving along a structural member.

For large offshore structures such as floating production storage and offloading (FPSO) installations, structural integrity assessments for cryogenic fluid leaks are needed. Since the fracture toughness of the currently used structural members is guaranteed up to -40 ° C, evaluation is made assuming that the structural members are broken in case of leakage of various cryogenic fluids. The evaluation range is limited to one structural member.

However, when a cryogenic fluid leaks at a point where a plurality of structural members intersect, a plurality of structural members may actually be exposed to a cryogenic environment at the same time. This situation is a dangerous situation outside the scope of the structural integrity assessment and can lead to major accidents that were not considered at the development stage.

SUMMARY OF THE INVENTION The present invention seeks to provide a flow-impeding pin for a cryogenic fluid that can prevent a hazardous situation by disrupting the flow of cryogenic fluid leaking from the storage tank to prevent it from moving along the structural member.

A flow-impeding pin for a cryogenic fluid according to an embodiment of the present invention includes a bimetal member, a first fixing part and a second fixing part. The bimetal member is composed of a first metal plate and a second metal plate having different thermal expansion coefficients, and the first metal plate having a thermal expansion coefficient lower than that of the second metal plate faces the structural member. The first fixing part is located on the upper side of the first metal plate and fixes the upper side of the bimetal member to the structural member and maintains the fixing force when contacting the cryogenic fluid. The second fixing part is located below the first metal plate to fix the lower side of the bimetal member to the structural member and lose the fixing force when it comes into contact with the cryogenic fluid.

The first metal plate may include one of an invar steel and a high manganese steel, and the second metal plate may include stainless steel. The first fixing portion may be formed of a welded portion. Upon contact with the cryogenic fluid, the lower side of the bimetallic member can be pushed outwardly by bending out of the structural member after being separated from the structural member.

The flow-impeding pin for the cryogenic fluid may further include a sealing tube positioned between the lower side of the first metal plate and the second fixing portion. The sealing tube may comprise a foam and a sealing layer sealing the foam in a compressed state.

The sealing layer can be broken by the bending force of the bimetal member in contact with the cryogenic fluid, and the foam can expand when the sealing layer breaks and support the lower side of the bimetal member. The foam may comprise a polyurethane foam and may be solidified after expansion.

A structure for a cryogenic fluid storage facility in accordance with an embodiment of the present invention includes a structural member and a flow-impeding pin for a cryogenic fluid. The structural member is installed adjacent to a storage tank for storing the cryogenic fluid and extends in one direction. The flow-impeding pin for the cryogenic fluid is installed on the surface of the structural member.

The flow-impeding pin for the cryogenic fluid may be provided in plural along the circumferential direction and the longitudinal direction of the structural member. The flow impeding pins for the cryogenic fluid of a particular row arranged along the circumferential direction of the structural member may be positioned differently from the flow impeding pins for the cryogenic fluid located in the next row.

According to the present invention, the flow-impeding pin for the cryogenic fluid is deformed upon contact with the cryogenic fluid to push the cryogenic fluid outwardly of the structural member. Thus, it is possible to prevent the leakage of the cryogenic fluid from moving along the structural member, and effectively prevent the dangerous situation in which a plurality of structural members are simultaneously exposed to the cryogenic temperature environment.

1 is a schematic perspective view of a structure for a cryogenic fluid storage facility in accordance with an embodiment of the present invention.
Figure 2 is a partial cross-sectional view of the structure for the cryogenic fluid storage facility shown in Figure 1;
FIG. 3 is a block diagram showing the state of the flow interrupt pin when the cryogenic fluid leaks to the structure for the cryogenic fluid storage facility shown in FIG. 2; FIG.
4 is a schematic perspective view showing a modification of the structure for the cryogenic fluid storage facility shown in FIG.
5 is a partial cross-sectional view of the structure for the cryogenic fluid storage facility shown in FIG.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

When an element such as a layer, a film, an area, a plate, or the like is referred to as being "on" another element throughout the specification, it includes not only the element "directly above" another element but also the element having another element in the middle. And "above" means located above or below the object portion, and does not necessarily mean that the object is located on the upper side with respect to the gravitational direction.

When an element is referred to as "including" an element throughout the specification, it means that the element may further include other elements unless specifically stated otherwise. The sizes and thicknesses of the respective components shown in the drawings are arbitrarily shown for convenience of explanation, and the present invention is not limited to the illustrated ones.

1 is a schematic perspective view of a structure for a cryogenic fluid storage facility in accordance with an embodiment of the present invention.

Referring to FIG. 1, a cryogenic fluid storage facility (hereinafter, referred to as a 'structure') 100 of the present embodiment may be used in a variety of applications, such as a liquefied gas carrier, a floating production storage and unloading facility, It may be a structure of a floating facility or a structure of a facility installed on land to store liquefied gas.

The cryogenic fluid may be liquefied gas such as liquefied natural gas (LNG), liquefied petroleum gas (LPG), liquefied hydrogen, dimethyl ether, and the like. The structure 100 is in close proximity to a storage tank (not shown) that stores cryogenic fluid and thus comes into contact with the leaked cryogenic fluid when the cryogenic fluid leaks from the storage tank.

The structure 100 includes a straight structural member 10 and a flow impeding pin 20 for cryogenic fluid fixed to the outside of the structural member 10 . Although the structural member 10 is shown in FIG. 1 in parallel with the vertical direction, the direction in which the structural member 10 extends is not limited to a vertical direction.

The structural member 10 may be a tubular member having a circular or square cross section or a plate member having a straight section or a plate-like combination member having a cross-sectional shape of ten (10) or H (H). 1, the structure member 10 having the H-shaped cross section is shown as an example, but the shape of the structural member 10 is not limited to the illustrated example.

The flow disturbing fins 20 may be installed at a plurality of intervals along the circumferential direction of the structural member 10 with a distance therebetween. 1, the structural member 10 may be composed of a pair of first plate members 11 facing each other and a second plate member 12 connecting a pair of first plate members 11, The flow disturbing fins 20 may be installed on the outer surface of each of the first plate members 11 and on both side surfaces of the second plate member 12.

2 is a partial cross-sectional view of the structure shown in Fig.

1 and 2, the flow disturbance pin 20 includes a bimetal member 21, a first fixing portion 24 and a second fixing portion 25, and further includes a sealing tube 26 . The flow-impeding pin 20 is installed on the surface of the structural member 10 where the leaked cryogenic fluid is expected to flow.

The bimetal member 21 is formed by bonding (heterogeneous bonding) of the first metal plate 22 and the second metal plate 23 having different thermal expansion coefficients. The first metal plate 22 may include a metal having a low coefficient of thermal expansion, such as Invar steel or a high manganese steel. The second metal plate 23 may include a metal having a high thermal expansion coefficient, for example, stainless steel or the like.

The bimetallic member 21 is located such that the first metal plate 22 faces the structural member 10 and the second metal plate 23 faces outwardly of the structural member 10. [ The bimetal member 21 may have a flat rectangular plate shape.

The first fixing portion 24 is located between the upper side of the bimetal member 21 and the structural member 10 and fixes the upper side of the bimetal member 21 to the structural member 10. [ The first anchor 24 maintains a clamping force when in contact with the cryogenic fluid. To this end, the first fixing part 24 may comprise a weld, or may comprise an adhesive layer, for example a low temperature epoxy, which maintains an adhesive force at both normal and cryogenic temperatures.

The second fixing part 25 is located between the lower side of the bimetal member 21 and the structural member 10 and fixes the lower side of the bimetal member 21 to the structural member 10. [ The second fixing part (25) loses fixing force in contact with the cryogenic fluid. The second fixing part 25 may be composed of an adhesive layer which maintains the adhesive force at room temperature but loses the adhesive force in a cryogenic environment.

The sealing tube 26 is located between the lower side of the bimetal member 21 and the second fixing part 25 and can be attached to the bimetal member 21 and the second fixing part 25 by an adhesive layer have. The sealing tube 26 may include a foam 261 and a sealing layer 262 that seals the foam 261 in a compressed state.

The foam 261 may include a polyurethane foam or the like and is compressed by the high pressure in the initial foaming state and then surrounded by the sealing layer 262. [ The sealing layer 262 may comprise a polymer film such as polyethylene terephthalate.

When the bimetal member 21 is bent by the cryogenic fluid, the sealing layer 262 can be broken by the bending force of the bimetal member 21. [ When the sealing layer 262 is broken, the foam 261 is subjected to volume expansion with loss of compressive force. Particularly, since the polyurethane foam is solidified upon contact with oxygen, it can be solidified after expansion due to fracture of the sealing layer 262, and the shape thereof can be maintained.

FIG. 3 is a block diagram showing the state of a flow interrupt pin when a cryogenic fluid leaks to the structure shown in FIG. 2; FIG.

3, when the cryogenic fluid leaks from the storage tank and flows along the structural member 10 and the flow-impeding pin 20, the first metal plate 22 having a low coefficient of thermal expansion is substantially free from a change in length On the other hand, the second metal plate 23 having a high thermal expansion coefficient shrinks rapidly.

At this time, the first fixing portion 24 maintains the fixing force even when the first fixing portion 24 is in contact with the cryogenic fluid, but the second fixing portion 25 loses fixing force due to contact with the cryogenic fluid. Thus, the underside of the bimetal member 21 separates from the structural member 10 and bends toward the outside of the structural member 10, interrupting the flow of the cryogenic fluid.

That is, the bimetal member 21 with its outwardly bent outward pushes the flow of the cryogenic fluid outwardly of the structural member 10, preventing the cryogenic fluid from flowing along the structural member 10.

When the lower portion of the bimetal member 21 is bent outward, the sealing layer 262 of the sealing tube 26 is broken by the bending force, and the pressure applied to the foam 261 is released. Thus, the foam 261 expands and supports the bent lower portion of the bimetal member 21. [

As described above, the foam 261 may include a polyurethane foam, and the polyurethane foam is exposed to the air and solidifies upon contact with oxygen. The foamed body 261 is expanded and then solidified and maintains its shape, so that the bent lower portion of the bimetal member 21 can be supported to maintain its intended shape.

The plurality of flow disturbing fins 20 may be provided along the circumferential direction of the structural member 10 and may be provided along the longitudinal direction of the structural member 10. [ These flow-impeding fins 20 can block the cryogenic fluid flow along the structural member 10 during multiple stages of cryogenic fluid leakage and prevent a hazard situation.

FIG. 4 is a schematic perspective view showing a modification of the structure shown in FIG. 1, and FIG. 5 is a partial sectional view of FIG.

4 and 5, the structural member 10 'may be a tubular member having a circular cross section, and the flow disturbing fins 20 may have a circumferential direction and a longitudinal direction (vertical direction) of the structural member 10' And can be installed in plural.

The flow-impeding pin 20 shown in Fig. 4 may be in the form of a flat rectangular plate or may be plate-shaped warped along the structural member 10 '. The flow-impeding pin 20 shown in Figure 4 may have a smaller width than the flow-impeding pin 20 shown in Figure 1

The flow-arresting pins 20 of a particular row arranged along the circumferential direction of the structural member 10 'may be positioned differently from the flow-impeding pins 20 located at the next row. In this case, even if the leaked cryogenic fluid passes between the flow-arresting fins 20, it comes into contact with the flow disturbance fins 20 located in the next row, so that the flow of the cryogenic fluid can be shut off.

As such, the flow-impeding pin 20 of the present embodiment is deformed upon contact with the cryogenic fluid to push the cryogenic fluid outwardly of the structural member 10, 10 '. Therefore, it is possible to prevent the leaked cryogenic fluid from moving along the structural members 10 and 10 ', effectively restricting the dangerous situation in which the plurality of structural members 10 and 10' are simultaneously exposed to the cryogenic environment.

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, Of course.

100: Structure for cryogenic fluid storage facility
10, 10 ': structural member 20: flow-impeding pin
21: bimetal member 22: first metal plate
23: second metal plate 24: first fixing portion
25: second fixing part 26: sealing member
261: Foam 262: Sealing layer

Claims (10)

A bimetallic member having a first metal plate and a second metal plate, the first metal plate having a thermal expansion coefficient different from that of the first metal plate and having a thermal expansion coefficient lower than that of the second metal plate,
A first fixing unit positioned above the first metal plate to fix the upper side of the bimetal member to the structural member and to maintain a fixing force when the bimetal member is in contact with the cryogenic fluid; And
The second metal plate being located below the first metal plate and fixing the lower side of the bimetal member to the structural member,
The flow disturbing pin for the cryogenic fluid. The method according to claim 1,
Wherein the first metal plate includes one of an invar steel and a high manganese steel,
Wherein the second metal plate comprises stainless steel. The method according to claim 1,
Wherein the first fastening portion comprises a weld. The method according to claim 1,
Wherein the lower portion of the bimetallic member separates from the structural member and bends out of the structural member when in contact with the cryogenic fluid to push out the flow of the cryogenic fluid outwardly. The method according to claim 1,
And a sealing tube positioned between the lower side of the first metal plate and the second fixing portion,
Wherein the sealing tube comprises a foam and a sealing layer for sealing the foam in a compressed state. 6. The method of claim 5,
Wherein the sealing layer is broken by a bending force of the bimetal member in contact with the cryogenic fluid,
Wherein the foam expands upon fracture of the sealing layer to support the lower side of the bimetal member. The method according to claim 6,
The foam comprises a polyurethane foam, and the flow-impeding pin for the cryogenic fluid which is solidified after expansion. A structural member disposed adjacent to a storage tank for storing the cryogenic fluid and extending in one direction; And
A flow obstruction pin for a cryogenic fluid according to any one of claims 1 to 7, provided on the surface of the structural member
≪ / RTI > for a cryogenic fluid storage facility. 9. The method of claim 8,
Wherein the plurality of flow-impeding pins for the cryogenic fluid are installed along a circumferential and longitudinal direction of the structural member. 10. The method of claim 9,
Wherein the flow disturbance fins for the cryogenic fluid in a particular row arranged along the circumferential direction of the structural member are positioned in a position that is different from the flow impeding fins for the cryogenic fluid located in the next row.

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