KR20170045926A - A liquefied gas tank and a ship having the same - Google Patents

Abstract

The present invention relates to a liquefied gas storage tank and a ship including the same. A tank for storing liquefied gas, comprises an outer wall forming a liquefied gas storage space; and a heat insulating material provided outside the outer wall. The heat insulating material is formed by filling an inner material in a mold. So, efficiency can be improved.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquefied gas storage tank and a liquefied gas storage tank,

The present invention relates to a liquefied gas storage tank and a vessel including the same.

When the engine consumes fuel to obtain power, exhaustion from the engine causes continuous environmental destruction. Especially, a ship which transports a large quantity of minerals, crude oil, natural gas, or containers containing more than a thousand containers, is a means of transporting the ocean and discharges exhaust gas while consuming fuel such as heavy oil or kerosene. It takes up a tremendous amount of transportation.

Recently, the International Maritime Organization (IMO) has discussed the regulation of exhaust gas emission from ships, and according to the currently established measures (IMO Tier III, etc.), every time a certain year is reached, Is gradually strengthened.

Due to this situation, eco-friendly fuel that can reduce environmental pollution caused by exhaust gas is attracting attention, among which liquefied natural gas (LNG) is recently attracting attention.

However, since LNG has a boiling point of -163 ° C, it exists as a bulky gas at room temperature. Therefore, in order to transport a large amount of LNG, it is necessary to liquefy and store the LNG. Liquefied LNG storage tanks include membrane type tanks and independent tanks.

Membrane-type tanks are those that are directly connected to the structure of the hull and are not separated from the hull. The membrane type tank has a structure in which a secondary barrier (a seat and an insulating wall structure) and a primary barrier (a seat and an insulating wall structure) are laminated on the inner wall of the hull. Therefore, the membrane type tank is directly connected to the hull so that the load of the LNG is transferred to the hull without being supported by the tank.

On the other hand, a stand-alone tank is a tank provided separately from the structure of the hull, and is a tank manufactured in a form mounted on the hull. The independent tank has a structure in which a heat insulating material is enclosed on the outer wall of the tank and is supported by a support provided inside the hull. Therefore, the independent tank is separated from the hull and is supported by the hull so that the tank directly supports the load of the LNG.

Since the stand-alone tanks do not have a complicated barrier structure as compared with the membrane type tanks, the degree of difficulty of the operation can be relatively low. However, in the process of preparing the stiffener on the outer wall of the tank, the stud bolt joining process, and so on. Therefore, in order to reduce the total working water of the stand-alone type tank, research and development on the structure improvement and the work process improvement are continuously performed.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art as described above, and it is an object of the present invention to provide a method of manufacturing a liquefied gas storage tank, in which a welding lighter is reduced and a work difficulty is lowered, And a vessel including the liquefied gas storage tank.

It is another object of the present invention to provide a liquefied gas storage tank and a ship including the liquefied gas storage tank, which can easily prepare a heat insulating material by using a mold and make the heat insulating material made of a flame retardant material.

It is another object of the present invention to provide a liquefied gas storage tank and a vessel including the liquefied gas storage tank, in which a heat insulating material can be easily installed by utilizing a stud nut instead of a stud bolt when fixing a heat insulating material.

It is another object of the present invention to provide a liquefied gas storage tank and a vessel including the liquefied gas storage tank, which can prevent foreign substances from entering the gap between the heat insulating material and the outer wall, .

It is another object of the present invention to provide a liquefied gas storage tank which is capable of securing a storage capacity by providing a recessed portion at a lower side corresponding to a bench portion in a liquefied gas storage tank, A liquefied gas storage tank and a vessel including the liquefied gas storage tank.

A liquefied gas storage tank according to one aspect of the present invention is a tank for storing liquefied gas, comprising: an outer wall forming a liquefied gas storage space; And a heat insulating material provided on an outer side of the outer wall, wherein the heat insulating material is manufactured by filling an inner material into a mold.

Specifically, the heat insulating material may be manufactured by further supplying a sheath to the outside of the inner member inside the mold.

Specifically, the heat insulating material can be manufactured by filling an inner member and a sheath between the first mold and the second mold which can be detached.

Specifically, the inner member may include a polyurethane foam.

Specifically, the inner member may include perlite or glass bubble.

Specifically, the envelope may comprise glass bubbles.

A ship according to one aspect of the present invention is characterized by including the liquefied gas storage tank.

The liquefied gas storage tank and the ship including the liquefied gas storage tank according to the present invention can easily change the welding method of the stiffener, and safety can be secured by manufacturing the flame-retardant insulation material using the mold.

Further, since the liquefied gas storage tank according to the present invention and the ship including the liquefied gas storage tank according to the present invention can be installed with a stud nut, it is possible to reduce the work amount and the work difficulty, and the gap between the heat insulating material and the outer wall So that the heat insulating material can be installed from the outside, thereby maximizing the working efficiency.

The liquefied gas storage tank according to the present invention and the ship having the liquefied gas storage tank according to the present invention are characterized in that when a liquefied gas storage tank is installed in a hold having a bench portion, a recessed portion is formed below the liquefied gas storage tank, .

1 is a cross-sectional view of a liquefied gas storage tank according to an embodiment of the present invention.
2 to 4 are sectional views of a stiffener according to an embodiment of the present invention.
5 is a sectional view of a mold for producing a heat insulating material according to an embodiment of the present invention.
6 to 8 are partial cross-sectional views of a liquefied gas storage tank according to an embodiment of the present invention.
9 is a perspective view of a stud nut according to an embodiment of the present invention.
10 is a partial cross-sectional view of a liquefied gas storage tank according to an embodiment of the present invention.
11 to 13 are sectional views of a liquefied gas storage tank according to an embodiment of the present invention.
FIG. 14 is a cross-sectional view of a liquefied gas storage tank according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Herein, the liquefied gas may be LPG, LNG, ethane or the like, and may be, for example, LNG (Liquefied Natural Gas). It is also noted that the present invention includes a vessel including a liquefied gas storage tank, together with the liquefied gas storage tank described below.

1 is a cross-sectional view of a liquefied gas storage tank according to an embodiment of the present invention.

Referring to FIG. 1, a liquefied gas storage tank 1 according to an embodiment of the present invention is installed in a hull 2. The liquefied gas storage tank 1 may be provided in the hold 20 of the hull 2. At this time, the hold 20 of the hull 2 is provided in a plurality of liquefied gas storage tanks 1, Can be installed in the holder (20). Accordingly, at least one liquefied gas storage tank 1 may be provided in the hull 2.

The hold 20 of the hull 2 may be partitioned by a partition wall (not shown) or a coffer dam. A space may be formed between the inner surface of the hold 20 and the liquefied gas storage tank 1. At this time, an inert gas can be filled in the space for safety, and the worker can access the space through the space. Of course, when the operator enters and exits, the processing such as the discharge of the inert gas and the inflow of the oxygen can be performed in advance so that the inside air of the space becomes the same condition as the outside air.

The ship on which the liquefied gas storage tank 1 is installed may be a carrier carrying the liquefied gas. In this case, the ship may be an LNG carrier, an LPG carrier, or the like. Or the vessel may be a vessel propelled by using the liquefied gas while mounting the liquefied gas storage tank (1). That is, the liquefied gas storage tank 1 installed on the ship may be a fuel tank for driving the engine. In this case, the vessel may be various merchant ships such as container ships.

Of course, in this specification, the vessel may be used to mean an offshore structure other than a general merchant ship, and a vessel on which a liquefied gas storage tank 1 is installed may refer to FLNG or the like.

The liquefied gas storage tank 1 includes an outer wall 10, a reinforcing member 11, a heat insulating member 12, a support 13, and a partition 14.

The outer wall 10 forms a liquefied gas storage space. The outer wall 10 may be made of a metal material, and may be made of SUS material to store cryogenic liquefied gas.

The outer wall 10 may correspond to a structure that surrounds the liquefied gas while directly contacting the liquefied gas, and may correspond to the inner wall in terms of the liquefied gas. Also, since it is provided on the inner side with respect to the heat insulating material 12, it may also be referred to as an inner wall.

The liquefied gas storage space formed by the outer wall 10 may be in the form of a prismatic pillar. For example, as shown in the figure, the storage space may have an octagonal shape with a regular cross section, and the shape of the storage space may not be limited to the above.

The inner wall of the outer wall 10 may be partitioned into a partition wall 14, and a reinforcing member 11 may be provided on the inner side to reinforce structural strength. Since the outer wall 10 is made of a metal material, external heat can be transferred to the internal liquefied gas to vaporize the liquefied gas. The external wall 10 may be provided with a heat insulating material 12 on the outside thereof.

The reinforcing member (11) is provided inside the outer wall (10). Reference is made to Figs. 2 to 4 together with Fig. 1 for explaining the reinforcing member 11. Fig.

2 to 4 are sectional views of a stiffener 11 according to an embodiment of the present invention.

2 to 4, the reinforcing member 11 may be provided so as to protrude in a "T" shape on the inner side of the outer wall 10 as shown in Fig. Of course, the reinforcing member 11 is "|" Or may be protruded in a shape.

Referring to FIG. 2, the stiffener 11 may be formed in a "T" shape, wherein the stiffener 11 is extruded or may be provided by fillet welding two flat plates together.

The lower end of the "T" shaped stiffener 11 is welded to the inside of the outer wall 10, and the lower end of the stiffener 11 and the outer wall 10 can be connected by vertical welding. In this case, since a large amount of vertical welding has to be performed, the efficiency of the work may be reduced.

On the other hand, referring to FIG. 3, the present invention solves the foregoing problems by changing the shape of the stiffener 11 and the manner of welding with the outer wall 10. Specifically, the reinforcing member 11 may be provided in an "I" shape instead of a "T" shape. At this time, the reinforcing member 11 may be formed by vertically welding three flat plates to each other, but it can be extruded and manufactured preferably in an "I" shape. That is, the reinforcing member 11 can be manufactured at a time in such a manner that the cross section of the "I" shape is extended by a predetermined length (for example, 10 to 20 m) in the longitudinal direction.

The stiffener 11 can then be secured to the outer wall 10 by welding, but it can be secured by butt welding, thereby protecting the operator against vertical welding and maximizing the efficiency of the work.

3, the outer wall 10 may be at least partially disconnected by the width of the stiffener 11 and the stiffener 11 may be welded to the outer wall 10 such that the lower end is continuously connected to the outer wall 10. [ . Therefore, the portions disconnected from the outer wall 10 can be connected to each other by the lower end of the reinforcing member 11. [

In this case, however, the outer wall 10 may be partly divided into pieces and then connected to each other by the reinforcing member 11. Therefore, as shown in FIG. 4, the reinforcing member 11 is welded by lap welding It may be fixed to the outer wall 10.

That is, referring to FIG. 4, the outer wall 10 may have a continuous shape without disconnection at a portion where the reinforcing member 11 is installed. This is similar to the case of Fig. However, since the stiffener 11 has an "I" shape in FIG. 4, the lower end of the stiffener 11 can be fixed to the outer wall 10 by overlap welding so as to overlap the outer wall 10.

3 or 4, the welding required when attaching the stiffener 11 to the outer wall 10 may be butt welding or lap welding instead of vertical welding, which lowers the degree of difficulty of welding, The work efficiency can be increased by reducing the airflow.

In addition, the present invention can reduce the welding field by reducing the welding field by applying the extruded material, thereby minimizing the welding deformation. In the case of FIG. 3, the welded portion is changed from the fillet welding with severe discontinuity to the butt welding with low discontinuity, In FIGS. 3 and 4, since the welding is performed at a position where the bending moment is lower than the existing welding position, this also increases the fatigue life.

The heat insulating material 12 is provided on the outer side of the outer wall 10. As described above, the heat insulating material 12 is provided to prevent the liquefied gas from being vaporized due to penetration of the external heat, and it is possible to use materials such as polyurethane foam (PUF), perlite, .

The heat insulating material 12 is generally formed of a polyurethane foam, and can be formed by cutting using NC cutting or the like. However, since the heat insulating material 12 has the depressed portion 122 or the like for fixing the outer wall 10 as described later, the cutting work of the heat insulating material 12 is very difficult and the working efficiency can be lowered.

Therefore, the present invention can use the mold 125 to solve this problem, which will be described with reference to FIG.

5 is a cross-sectional view of a mold 125 for producing a heat insulator 12 according to an embodiment of the present invention.

5, the heat insulator 12 can be manufactured by filling the mold member 125 with the inner member 12a. Specifically, the mold 125 can form a hollow space therein. When the hollow member 12a including the polyurethane foam, the pearlite, the glass bubble, and the like is filled in the hollow space, The inner member 12a is cured while having the shape of an empty space, so that the heat insulating material 12 can be easily manufactured.

The mold 125 may be composed of a first mold 125a and a second mold 125b and the first mold 125a and the second mold 125b may be detachable from each other. When the first mold 125a and the second mold 125b are separated from each other, the empty space is opened. At this time, the inner member 12a or the like can be drawn into the empty space, and the first mold 125a and the second mold 125b 125b may be coupled to each other, the empty space may be closed, so that it is possible to manufacture the shape of the heat insulating material 12 through the inner member 12a or the like.

Of course, the mold 125 may be formed from an outer side of at least one of the first mold 125a or the second mold 125b to an empty space in a state where the first mold 125a and the second mold 125b are engaged, The first member 125a and the second mold 125b are separated from each other by inserting the inner member 12a or the like through a separate hole (not shown) Can be taken out from the mold 125. In addition, various manufacturing methods using the mold 125 may be utilized in the present invention.

The heat insulating material 12 can be manufactured by further supplying the outer shell 12b to the outside of the inner member 12a inside the mold 125 in addition to the inner member 12a. When the heat insulator 12 has the shell 12b, the inner member 12a may include a polyurethane foam or the like and the shell 12b may be a glass bubble putty including a glass bubble or the like.

Since the glass bubble and the polyurethane foam have similar physical properties, when the heat insulating material 12 is manufactured using the mold 125, the outer shell 12b and the inner member 12a can be firmly coupled to each other. Therefore, the heat insulating material 12 enclosed by the outer shell 12b such as a glass bubble putty can be manufactured by the mold 125, such as a polyurethane foam.

Polyurethane foam is vulnerable to fire because it is a flammable material. Particularly, the polyurethane foam is a material which is low in safety, such that there is a history of a fatal accident caused by a fire caused by the polyurethane foam insulation 12 of the conventional liquefied gas storage tank 1.

However, since the polyurethane foam is inexpensive and has good heat insulation performance, it is used more than other materials and it is necessary to secure fire safety. The present invention is applicable to a case where the inner member 12a such as a polyurethane foam is made of a glass bubble So that the heat insulating material 12 can have flame retardancy.

Accordingly, the present invention provides a method of manufacturing a heat insulating material 12 by using a mold 125 to improve the efficiency of manufacturing the heat insulating material 12, and further comprising a step of wrapping a combustible polyurethane foam or the like with a flame-retardant material such as glass bubble The safety can be ensured by producing the heat insulating material 12. [

Hereinafter, the fixing structure of the heat insulating material 12 and the outer wall 10 will be described with reference to Figs. 6 to 10. Fig.

6 to 8 are partial cross-sectional views of a liquefied gas storage tank 1 according to an embodiment of the present invention, FIG. 9 is a perspective view of a stud nut 102 according to an embodiment of the present invention, Sectional view of a liquefied gas storage tank 1 according to an embodiment of the invention.

6, the heat insulating material 12 according to an embodiment of the present invention may be manufactured by the mold 125 described above, or may be manufactured by a conventional method such as cutting or the like .

The outer wall 10 may have a stud bolt 101 fixed to its outer surface. The stud bolt 101 may be a bolt having a thread, and may have only an end at the outer side, a head fixed to the outer wall 10, or a column without a head and formed with threads. In the latter case, the outer wall 10 may be provided with a spacer (not shown) for fixing the stud bolt 101, and the stud bolt 101 may be welded to the spacer.

A gap 126 may be formed between the outer wall 10 and the heat insulating material 12 by providing the stud bolt 101 or the spacer or the like. These gaps 126 leak to the hold 20 of the hull 2 and cause harm to the operator when the liquefied gas leaks to the outside of the outer wall 10 due to breakage of the outer wall 10 due to an unexpected cause, Or the like.

That is, the leaking liquefied gas flows along the gap 126, and the liquefied gas flowing along the gap 126 can be collected and handled safely in a drip tray (not shown). To this end, the gap 126 may be provided toward the drip tray.

The heat insulating material 12 can be fixed to the outer wall 10 through the stud bolt 101. [ The depressed portion 122 of the heat insulating material 12 may be recessed to a depth that does not penetrate the heat insulating material 12, Lt; / RTI >

The fixing nut 121 is screwed to the stud bolt 101 and the insulating nut 12 is inserted into the stud bolt 101 as the insulator 12 is pressed downward in the direction of the outer wall 10, Can be fixed to the outer wall 10. The depression 122 may then be covered by a separate thermal insulation material.

Of course, a gap formed between the heat insulating material 12 and the heat insulating material 12 can be filled with another heat insulating material like the depressed portion 122, and the shape and material of the heat insulating material used at this time are not particularly limited.

7, the present invention may include a stud nut 102 in place of the stud bolt 101. [ The stud nut 102 may be fixed to the outer wall 10 similarly to the stud bolt 101 and may be screwed with a fixing bolt 123 to be described later to fix the heat insulating material 12 to the outer wall 10.

9, the stud nut 102 may have a bolt hole 1021 for receiving the fixing bolt 123, and may have a circular cross section. In addition, the stud nut 102 may have a shape in which discs of different diameters are stacked in a concentric shape.

Specifically, the stud nut 102 may have a stacked shape of discs of different diameters so that the diameter of the stud nut 102 becomes relatively smaller toward the outside (as the distance from the outer wall 10). At this time, the stud nut 102 may be fixed to the outer wall 10 by spot welding.

The stud nut 102 in Fig. 7 can be fixed by simple spot welding, so that the work process can be facilitated. That is, the present invention can efficiently improve the working process by using the stud nut 102 instead of the stud bolt 101.

6, a depression 122 is formed in the heat insulating material 12. However, the fixing bolt 123 may be located at the depression 122 at this time. The fixing bolt 123 penetrates the heat insulating material 12 and is coupled to the stud nut 102 to fix the heat insulating material 12 to the outer wall 10.

The stud nut 102 can be spaced apart from the outer wall 10 by the height of the stud nut 102 and the spacing space between the heat insulator 12 and the outer wall 10 And a gap 126 for treatment of the leaked liquefied gas as described.

Referring to FIG. 8, the heat insulator 12 may be provided with a nut receiving portion 127. The stud nut 102 has a shape in which the discs are laminated to each other, and the discs have diameters different from each other, so that a step can be provided in the stud nut.

At this time, the heat insulating material 12 is engaged with the stud nut 102 through the nut receiving portion 127 to form a gap 126 between the heat insulating material 12 and the outer wall 10, The position of the heat insulating material 12 can be accurately aligned.

That is, the heat insulator 12 forms a nut-receiving portion 127 for inserting at least a portion of the stud nut 102 therein. The stud nut 102 is installed on the outer wall 10, The gap 126 between the heat insulating material 12 and the outer wall 10 can be provided through the remaining portion which is not drawn into the nut inserting portion 127 while being drawn into the inner wall of the heat insulating member 12.

Referring to FIG. 10, the present invention may further include a cover portion 124. 6 to 8, the heat insulator 12 may be formed by a combination of the stud bolt 101 and the fixing nut 121 and / or a combination of the stud nut 102 and the fixing bolt 123 A gap may be formed between the heat insulating material 12 and the heat insulating material 12 and a gap 126 may be formed between the heat insulating material 12 and the outer wall 10. [

However, when the work of fixing the heat insulating material 12 to the outer wall 10 is performed from the outside, foreign matter such as rain or dust is separated from the gap 126 between the heat insulating material 12 and the outer wall 10 through the gap between the heat insulating materials 12. [ There is a fear that it may flow into the apparatus.

Therefore, in the related art, the installation of the heat insulating material 12 is carried out in the hold 20 of the hull 2. In this case, the working space is narrow and poor and the work difficulty rises and the musculoskeletal diseases of workers are frequently generated there is a problem.

Therefore, the present invention can solve the above problem by using the cover portion 124 so that the installation of the heat insulating material 12 can be performed in an open space outside. The cover portion 124 may be provided to seal the gap between the heat insulating material 12 and the outer wall 10. [

The cover portion 124 can be detachably fixed to the heat insulating material 12 to seal the gap 126. At this time, the lower end of the cover part 124 may be in close contact with the outer surface of the outer wall 10, and the upper end may be in close contact with the outer surface of the heat insulating material 12.

Specifically, the cover portion 124 has a "C" shape so that at least a part of the lower end can be drawn into the gap 126 while closely adhering to the outer wall 10 and the outer surface of the outer wall 10, The side surface and the outer surface of the heat insulating material 12.

That is, the cover part 124 is provided in the gap between the heat insulating materials 12 to seal the gap 126, so that even if the process of installing the heat insulating material 12 on the outer wall 10 is performed from the outside, Can be blocked.

Specifically, the operator fixes the heat insulating material 12 to the outer wall 10 through a combination of the stud bolt 101 and the fixing nut 121 and / or a combination of the stud nut 102 and the fixing bolt 123, The gap 124 can be provided in the heat insulating material 12 to seal the gap 126.

When the installation of the heat insulating material 12 is completed or the liquefied gas storage tank 1 can be mounted in the hold 20 of the hull 2, the cover part 124 is fixed to the heat insulating material 12, The gas storage tank 1 can be drawn into the hold 20. At this time, as the cover portion 124 is removed in the holder 20, foreign substances may not flow into the gap 126.

Removal of the cover portion 124 may be performed by removing the lower end of the cover portion 124 from the gap 126 and then pulling the cover portion 124 outwardly from the gap. May be accomplished by the < / RTI >

The cover fixing portion 1241 may be a bolt or the like which penetrates through the cover portion 124 and is fixed to the heat insulating material 12 so as to detachably attach the cover portion 124 to the heat insulating material 12. [ Of course, the cover fixing portion 1241 may have various configurations that can be fixed to the heat insulating material 12.

The support 13 is provided on the hold 20 of the hull 2 and supports the outer wall 10. The support 13 supports the load of the liquefied gas storage tank 1. In the present invention, the support 13 includes a load supporting support 13 for supporting the vertical load of the liquefied gas storage tank 1, Can be used to mean a chock for preventing movement of the liquefied gas storage tank 1.

At this time, the anti-rolling chock for anti-rolling chock and the anti-pitching chock for anti-pitching are included in the movement preventing choke. In addition, when seawater flows into the hold 20, And a floating prevention choke for preventing the tank 1 from floating.

Hereinafter, the arrangement of the supports 13 according to the shape of the liquefied gas storage tank 1 according to the present invention will be described in detail with reference to FIGS. 11 to 14. FIG.

FIGS. 11 to 13 are cross-sectional views of a liquefied gas storage tank 1 according to an embodiment of the present invention, and FIG. 14 is a cross-sectional view of a liquefied gas storage tank 1 according to an embodiment of the present invention.

11 to 13, the liquefied gas storage tank 1 may be installed not only as a liquefied gas carrier but also as a container line, as described above. When the vessel on which the liquefied gas storage tank 1 is installed is a container- The holder 20 may be provided with a bench portion 21. [ The bench portion 21 is in the form of a step that descends from left and right to the center, and can support a container that can be loaded on the hold 20.

The reason for placing the bench portion 21 in the hold 20 is that the lower ends of the left and right side surfaces of the hull 2 are curved. That is, due to the sectional shape of the hull 2, the holder 20 can be provided with the bench portion 21 in order to efficiently implement the container loading.

Or the bench portion 21 may be provided for reinforcing the structural strength of the lower ends of the left and right sides of the hull 2 irrespective of the loading of the container. The liquefied gas storage tank 1 may be installed in the hold 20 of the container line to be retrofitted and the bench portion 21 may be provided with structural strength reinforcement The liquefied gas storage tank 1 may be installed in the hold 20 of the hull 2 such as a liquefied gas carrier or the like.

The liquefied gas storage tank 1 may have a shape in which the cross sectional area thereof decreases from the upper end to the lower end as the bench portion 21 is formed in the hold 20 where the liquefied gas storage tank 1 is to be provided. This is to prevent interference between the liquefied gas storage tank 1 and the bench portion 21. [

At this time, the support 13 may be provided on the bottom of the holder 20 to support the lower surface of the liquefied gas storage tank 1 as shown in Fig. However, the supports 13 may be relatively adjacent to each other as compared with the case of FIG. 1, since the flat portions on the lower surface of the liquefied gas storage tank 1 are reduced due to the bench portions 21. [

However, when the support is formed within this area, the stern part has a very low structural stability due to the possibility of conduction of the tank. In order to solve this problem, the floor area can be increased by reinforcing the hold floor to the first bench position as shown in FIG. In this case, however, the risk of tank conduction is reduced, but large-scale hull reinforcement is required and the available tank capacity is reduced.

As shown in Figs. 12 and 13, the present invention can change the shape of the liquefied gas storage tank 1 and the arrangement of the supports 13 for securing the liquefied gas storage space.

12, the support 13 can be installed on the bench portion 21, not on the bottom of the holder 20, to support the liquefied gas storage tank 1. At this time, the support 13 is installed at a position higher than the bottom of the holder 20, and may be provided on a flat surface in the bench portion 21. [

However, since the support 13 is provided on the bench portion 21, the portion supported by the support 13 in the liquefied gas storage tank 1 may be an inclined surface rather than a flat surface. At this time, the support 13 may have a structure capable of supporting the inclined surface.

Or the liquefied gas storage tank 1 is provided with a protruding portion (not shown) having a separate triangular structure at a portion supported by the support 13 and the support 13 is connected to the liquefied gas storage tank 1 The support 13 and the projections can be brought into plane contact with each other.

In this way, when the arrangement of the supports 13 is changed, the area of the narrowed portion on the lower side in the liquefied gas storage tank 1 can be enlarged. This is because the angle of the lower inclined surface of the liquefied gas storage tank 1 formed for avoiding interference with the bench portion 21 can be increased. Therefore, the present invention can enlarge the liquefied gas storage space by changing the arrangement of the supports 13.

13, the support 13 is provided on the bench portion 21, and the recessed portion 15 can be formed on the outer wall 10 of the liquefied gas storage tank 1. As shown in Fig. The recessed portion 15 may be in the form of being depressed in the inward direction as a portion corresponding to the bench portion 21.

The support 13 is provided on the bench portion 21 rather than on the bottom of the holder 20 as in Figure 12 wherein the support 13 is located at a relatively higher position than the bottom of the holder 20 at the bench portion 21 As shown in FIG. The support 13 can support the race portion in a state where the support portion 13 is provided on the bench portion 21.

The recess portion 15 may be recessed in a symmetrical manner with respect to the bench portion 21. In other words, the recess portion 15 may be in the form of a step that decreases from the left and right to the center. When the liquefied gas storage tank 1 has the recess portion 15, the inclined surface angle of the lower portion of the liquefied gas storage tank 1 mentioned above may be larger than that of Figs.

Increasing the angle of the inclined surface means that the reduction of the storage space caused by the presence of the inclined portion can be minimized. That is, the liquefied gas storage tank 1 of FIG. 12 can be expanded more than the liquefied gas storage tank 1 of FIG. 11, and the liquefied gas storage tank 1 of FIG. 13 1) can expand the storage space.

The recess portion 15 may be recessed so as to have a plane parallel to one surface of the bench portion 21 on which the support 13 is provided. In particular, the recess portion 15 may be formed on the bench portion 21) and the inclined surface (for example, the vertical surface) may be bent or connected to each other by a bent surface (in the form of a step symmetrical with the bench portion 21).

Therefore, the support 13 shown in FIG. 13 is provided between two parallel surfaces and has an advantage that the liquefied gas storage tank 1 can be stably supported. On the other hand, in the case of the support 13 shown in FIG. 12, there is a disadvantage in that the support 13 is unstable with respect to the support 13 in FIG. 13 in terms of support of the load. On the other hand, The advantage of anti-rolling and the like can be obtained.

Referring to FIG. 14, it is possible to confirm how much the storage space expansion of the liquefied gas storage tank 1 in FIG. 13 can be achieved compared to the liquefied gas storage tank 1 in FIG. The liquefied gas storage tank 1 of Fig. 13, in which the inclination angle of the lower inclined surface of the liquefied gas storage tank 1 is increased by changing the arrangement of the supports 13, Contrast can be expanded as much as the portion of the contrast.

The present invention is characterized in that the support 13 is placed on the bench portion 21 and the recessed portion 15 is formed in the liquefied gas storage tank 1 so that the liquefied gas storage tank 1 is held by the holding portion with the bench portion 21, It is possible to minimize the loss of the liquefied gas storage space even if it is installed in the storage tank 20.

The partition wall 14 defines a liquefied gas storage space. The partition wall 14 may be provided inside the storage space formed by the outer wall 10, and may be in the form of a flat plate. The barrier ribs 14 may be fixed to the barrier ribs 14 similarly to the reinforcing material 11 and the reinforcing materials 11 described above may also be provided on the barrier ribs 14 in the manner described above.

The barrier ribs 14 may include longitudinal barrier ribs 14a arranged in parallel in the longitudinal direction in the liquefied gas storage space and / or transverse barrier ribs 14b arranged in parallel to the transverse direction in the liquefied gas storage space , And the longitudinal barrier ribs 14a and the transverse barrier ribs 14b may be provided so as to intersect with each other.

The barrier rib 14 may be a closed type or an open type and the open type means that a hole is formed in the barrier rib 14. In this case, The flow of the liquefied gas through the partition wall 14 can be achieved. On the other hand, in the case of the closed type, there is no hole in the partition wall 14, so that the storage space can be completely separated by the partition wall 14.

The barrier ribs 14 may be provided for sloshing relief. Since the liquefied gas stored in the liquefied gas storage tank 1 is in a liquid state, it can freely flow in accordance with the movement of the ship. In this case, when the liquefied gas hits the outer wall 10 during the flow of the liquefied gas, the outer wall 10 may be damaged by the impact. Accordingly, the partition 14 mitigates the flow of the liquefied gas during the flow of the liquefied gas, thereby alleviating the sloshing problem.

As described above, according to the present invention, by efficiently improving the structure and the like of the liquefied gas storage tank 1, it is possible to secure both the efficiency of the operation, the storage capacity of the liquefied gas, and the manufacturing cost reduction.

The present invention may further include other embodiments derived by a combination of the above-described configurations. That is, the configurations described in the present invention can be selectively combined.

That is, the present invention is not limited to the above-described configurations, and may include any combination of two or more of the above configurations, and all the embodiments that occur by combination of any of the above configurations with known techniques.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be apparent to those skilled in the art that various combinations and modifications may be made without departing from the scope of the present invention. Therefore, it should be understood that the technical contents related to the modifications and applications that can be easily derived from the embodiments of the present invention are included in the present invention.

That is, the present invention is not limited to the above-described embodiments, and it is possible to use all of the novel embodiments combining at least one of the above-described embodiments with known technologies, and a new embodiment combining at least two of the above embodiments .

1: liquefied gas storage tank 2: hull
10: outer wall 101: stud bolt
102: Stud nut 1021: Bolt hole
11: Stiffener 12: Insulation
12a: inner member 12b: sheath
121: fixing nut 122: depression
123: fixing bolt 124: cover part
1241: Cover fixing part 125: Mold
125a: first mold 125b: second mold
126: Clearance 127: Nut inlet
13: Support 14:
14a: longitudinal bulkhead 14b: transverse bulkhead
15: recess 20: hold
21: Bench section

Claims (7)

In a tank for storing liquefied gas,
An outer wall forming a liquefied gas storage space; And
And a heat insulating material provided outside the outer wall,
The heat insulating material,
Wherein the mold is filled with an inner material. The heat sink according to claim 1,
And a jacket is further supplied from the inside of the mold to the outside of the mold. The heat sink according to claim 2,
Characterized in that an inner member and a sheath are filled between the first mold and the second mold that can be detached. The method according to claim 1,
Characterized in that it comprises a polyurethane foam. The method according to claim 1,
Characterized in that the liquefied gas storage tank comprises perlite or glass bubble. [3] The method according to claim 2,
Characterized in that it comprises a glass bubble. A vessel comprising the liquefied gas storage tank according to any one of claims 1 to 6.

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