KR101422517B1 - Cargo for liquefied gas carrier ship and manufacturing method thereof - Google Patents

Abstract

A cargo hold of a liquefied gas transportation vessel comprising a secondary barrier structure and a method of making the same are disclosed. The cargo hold of the liquefied gas carrier according to the embodiment of the present invention includes a secondary insulation panel structure that is stacked and fixed on the outer wall of the ship and is spaced apart from each other and an auxiliary barrier structure that is stacked and fixed on the secondary insulation panel structure, The barrier structure includes a plane barrier fixed on the secondary insulation panel structure, a strip barrier attached to an edge of the plane barrier, and a joint barrier attached to an end of the strip barrier, wherein the strip barrier is spaced apart from the secondary insulation panel structure Wherein the joint barrier comprises a second corrugation extending a first corrugation of the strip barrier and an intersection point of a second corrugation extending in a different direction.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a cargo hold for a liquefied gas transportation vessel,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cargo hold of a liquefied gas transportation vessel and a manufacturing method thereof, and more particularly to a cargo hold of a liquefied gas transportation vessel including an auxiliary barrier structure and a manufacturing method thereof.

Liquefied gas refers to a colorless transparent cryogenic liquid that reduces the volume of methane-based natural gas to -162 ° C and reduces its volume by one-sixth.

As such liquefied gas is used as an energy source, an efficient transportation method that can transport a large amount from the production base to the place of purchase of the demand site has been examined in order to utilize this gas as energy. As a part of this effort, A liquefied gas transport vessel capable of being transported by sea was developed.

However, the liquefied gas transportation vessel is required to have a cargo that can store and store the liquefied gas liquefied at an extremely low temperature.

That is, since the liquefied gas has a vapor pressure higher than atmospheric pressure and has a boiling temperature of approximately -162 ° C, in order to safely store and store such a liquefied gas, the cargo window storing the liquefied 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 thermal stress and heat shrinkage and prevents heat intrusion.

The cargo hold can be classified as an independent tank type and a membrane type depending on whether the load of the cargo directly acts on the heat insulating material. Membrane-type cargo holds can be classified into GTT NO 96 type and TGZ Mark III type. Independent tank type storage tanks can be classified into MOSS type and IHI-SPB type.

The Mark III type cargo holds have a secondary insulation panel structure consisting of a stainless steel membrane wall, a secondary wall made of a flexible material called triplex, a polyurethane foam insulation material, And the car-insulating panel structure is arranged so as to alternate from the cargo hold outer wall.

In the structure of the cargo hold having such a structure, the auxiliary barrier is generally applied in a form adhered to the primary insulation panel through a glue of an epoxy resin or a polyurethane material. Therefore, the construction is sensitive to internal temperature and humidity of the inside of the cargo hold, and it takes a long time to harden the gluing, so there is a problem that the air is lengthened in forming the overall cargo hold insulation structure.

In order to solve the problem of the adhesive seal of the secondary barrier, a technique of implementing the secondary barrier by the welding method has recently been proposed. However, in the case of implementing the secondary barrier by welding, it is difficult to perform the welding work to cover the gap between the primary insulation panel structures, which is an empty space without the support, and in particular to cope with the rapid contraction and expansion due to the structural change in temperature There is a problem that it is difficult to implement the auxiliary barrier.

Korean Patent Laid-Open Publication No. 10-2012-0111240 discloses a primary wall of an lacquer cargo hold and an insulating wall of a liquid cargo hold including the same.

[Patent Literature]

Korean Patent Publication No. 10-2012-0111240 (disclosed on October 10, 2012)

An embodiment of the present invention is to provide a cargo hold of a liquefied gas transportation vessel that forms an auxiliary barrier without adhering thereto, and a method of manufacturing the same.

Another object of the present invention is to provide a cargo hold of a liquefied gas transportation vessel and a method of manufacturing the same, which can improve the overall productivity by forming auxiliary barriers by welding to shorten work processes and work periods.

It is another object of the present invention to provide a cargo hold for a liquefied gas transportation vessel capable of eliminating thermal stress of auxiliary barriers and a method of manufacturing the same.

It is another object of the present invention to provide a cargo hold for a liquefied gas transportation vessel having a continuity of corrugation for relieving thermal stress while easily connecting a joint portion of a primary insulation panel structure and a method of manufacturing the same.

According to an aspect of the present invention, there is provided a secondary insulation panel structure comprising: a secondary insulation panel structure stacked on an outer wall of a ship and spaced apart from each other; And a secondary barrier structure laminated and fixed on the secondary insulation panel structure, wherein the secondary barrier structure comprises: a plane barrier fixed on the secondary insulation panel structure; A strip barrier attached to an edge of the plane barrier; And a joint barrier attached to an end of the strip barrier, the strip barrier having a first corrugation along a space between the spaced apart secondary insulation panel structures, A cargo hold of a liquefied gas transportation vessel having a second corrugation extending a first corrugation and a second corrugation extending in a different direction may be provided.

The secondary insulation panel structure includes a reinforcing panel at an upper edge thereof, and the auxiliary barrier structure includes a connection strip coupled to the reinforcing panel. The plane barrier includes a liquefied gas transportation vessel Can be provided.

In addition, the strip barrier may be provided with a chamfered line at an angle of 45 degrees to the end edge, and the strip barrier that meets at a right angle may be provided with a cargo hold of a liquefied gas transportation vessel welded in a state where the chamfer lines are welded.

In addition, the joint barrier may be provided with a cargo hold of a liquefied gas transportation vessel including an end of the strip barrier in contact therewith and an outer line passing between both ends of the chamfer line.

According to another aspect of the present invention, there is provided a method for manufacturing a cargo hold of a liquefied gas transportation vessel that is stacked and fixed in the order of a secondary insulation panel structure and an auxiliary barrier structure from an outer wall of a ship, the secondary barrier structure comprising: And the strip barrier is welded to join the strip barrier and the end of the adjacent strip barrier is coupled to the joint barrier, A method of manufacturing a cargo hold of a liquefied gas transportation vessel, which is manufactured by welding the strip barrier and the joint barriers by welding, can be provided.

The secondary insulation panel structure is manufactured by laminating and fixing secondary insulation panels and then stacking and fixing reinforcing panels on the upper surfaces of the secondary insulation panels. The secondary barrier structure is provided with connecting strips in the grooves of the reinforcing panel And then joining the plane barrier and the connecting strip to each other by welding. The present invention also provides a method for manufacturing a cargo hold of a liquefied gas transportation vessel.

In addition, in the method of manufacturing the auxiliary barrier structure, a method of manufacturing a cargo hold of a liquefied gas transportation vessel that combines the plane barrier and the strip barrier, and the combination of the strip barrier and the joint barrier by laser welding may be provided.

The cargo hold of the liquefied gas transportation vessel according to the embodiment of the present invention and the method of manufacturing the same can improve the airtightness of the auxiliary barrier by using the strip barrier and the joint barrier,

Further, the efficiency of the work process can be improved while improving the airtightness by using the welded joint.

In addition, it is possible to extend the corrugation of the strip barrier to the joint barrier wall to eliminate the thermal stress corresponding to the heat shrinkage of the auxiliary barrier wall.

In addition, the joining strip can be used to facilitate the joining process of the heat insulating panel structure and the auxiliary barrier structure.

In addition, by using laser welding for bonding the auxiliary barrier structures, it is possible to improve the working efficiency while improving the quality of the welding.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view and an enlarged view of a plan view of a cargo hold of a liquefied gas carrier according to an embodiment of the present invention, before a strip barrier and a joint barrier are combined.
2 is an exploded perspective view of FIG.
3 is an enlarged view of Fig.
4 is a cross-sectional view taken along the line AA in Fig.
FIG. 5 is a perspective view showing a combination of a strip barrier and a joint barrier on a plane barrier of a cargo hold of a liquefied gas transportation vessel according to an embodiment of the present invention. FIG.
6 is an enlarged view of Fig.
Figure 7 is a cross-sectional view after coupling corresponding to Figure 4;
Fig. 8 is a perspective view showing the relationship between the strip barrier and the joint barrier.
Fig. 9 is a plan view showing the relationship between the strip barrier and the joint barrier.
10 is a plan view showing a coupling relationship in which the joining order of the strip barrier and the joint barrier is different.

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, but 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.

The cargo hold of the liquefied gas transportation vessel includes a secondary insulation panel structure 100 and a primary insulation panel structure (not shown) stacked and fixed on the deck of the ship. The insulation panel structure insulates the interior of the cargo hold from the outside of the ship to prevent vaporization of the cryogenic liquefied gas. In order to improve the insulation performance, the insulation panel structure is usually installed on the first and second sides.

(Not shown) which is laminated and fixed on the primary insulation panel structure in order to prevent the liquefied gas from penetrating into the inside of the heat insulation panel structure and thereby preventing the structural stability of the cargo hold from being infringed, and on the secondary insulation panel structure 100 And an auxiliary barrier structure 200 which is stacked and fixed. The kitchen wall is a hermetic layer of a metal material (mainly SUS) that directly contacts the liquefied gas and prevents liquefied gas from penetrating into the primary insulation panel structure. In order to prevent the liquefied gas from penetrating into the secondary insulation panel structure 100 when the kitchen wall is intruded, an auxiliary barrier structure 200 is provided between the primary insulation panel structure 100 and the secondary insulation panel structure 100 . The secondary barrier structure 200 should be coupled to the secondary insulation panel structure 100 while maintaining airtightness.

A Tryplex may be used for the secondary barrier or a metal material (mainly SUS) may be used. In the case of triplex, adhesion is used, but when a metal material is used, the auxiliary barrier structure 200 is formed by welding.

In the case of using triplex, uniformity of adhesion is very important. However, there is a disadvantage that the skilled worker is needed and the working time is prolonged in order to obtain a uniform and sufficient bonding strength. Compared to this, the auxiliary barrier structure 200 made of metal is excellent in the airtightness because it is welded, and the work process is very simple. However, as compared with the triplex, it is vulnerable to thermal stress due to heat shrinkage, so that a corrugation or corrugation (hereinafter referred to as "corrugation") can be formed.

A secondary insulation panel 110 may be fixed to an outer wall (not shown) of the ship via a mastic (not shown) by piling up a plywood (not shown) In addition, the secondary insulation panel structure 100 may include a reinforcing panel 120 to mechanically join the secondary insulation panel 110 and the secondary barrier structure 200. At this time, although the secondary insulation panel 110 and the reinforcement panel 120 can be bonded by bonding, the auxiliary barrier structure 200 and the reinforcement panel 120 made of metal are different in degree of heat shrinkage, There are structurally vulnerable problems. For this, a method of mechanically coupling with the reinforcing panel 120 using the connecting strip 210 is possible.

The secondary insulation panel structures 100 are disposed on the outer wall of the ship so as to be spaced apart from each other. The reason for spacing is to allow mechanical bonding while the mastic is stationary. The secondary barrier structure 200 is stacked and fixed on the secondary insulating panel structure 100, and the primary adiabatic panel structure is stacked and fixed on the secondary barrier structure 200.

Since the primary insulating panel structure is smaller than the secondary insulating panel structure 100, the edge of the secondary barrier structure 200 is exposed when the primary insulating panel structure is stacked. After the primary adiabatic panel structure is stacked, a connection panel (not shown) is inserted therebetween, and finally, the kitchen wall is stacked and fixed, thereby completing the cargo window of the liquefied gas transportation vessel.

1 is a perspective view showing a state before a strip barrier 230 (see FIG. 5) and a joint barrier 240 (see FIG. 5) are coupled to a plane barrier 220 of a cargo hold of a liquefied gas carrier according to an embodiment of the present invention. Fig. 2 is an exploded perspective view of Fig. 1, and Fig. 3 is an enlarged view of Fig.

The secondary barrier structure 200 of the cargo hold of a liquefied gas carrier vessel according to an embodiment of the present invention includes a plane barrier 220, strip barriers 230, 231, and a joint barrier 240.

The plane barrier 220 is laminated on the secondary panel panel 100 and the strip barrier 230,231 connects neighboring plane barriers 220 spaced apart from one another. Finally, the joint barrier 240 is attached to the end of the strip barrier 230,231 to connect the neighboring strip barrier 230,231. This completes the airtightness of the secondary barrier structure 200 to prevent the liquefied gas from penetrating into the secondary insulation panel structure 100. The auxiliary barrier structure 200 is generally made of a metal material and may be made of a material such as SUS.

The secondary barrier structure 200 may include a connection strip 210. The connection strip 210 may be used to secure the plane barrier 220 on the secondary insulation panel structure 100. The connection strip 210 may be mechanically coupled to the reinforcement panel 120 stacked on the secondary insulation panel 110 and coupled to the plane barrier 220 by welding or the like.

The reinforcing panel 120 may have an insertion groove 121 into which the connecting strip 210 is inserted. The connection strip 210 may be engaged with the reinforcement panel 120 by fastening the rivet 211 to the rivet hole 212 formed in the insertion groove 121 of the reinforcement panel 120. It is also possible to use a bolt coupling or the like other than the rivet 211 coupling. It is sufficient that the connecting strip 210 is inserted only in a part of the reinforcing panel 120 and combined with the plane barrier 220. At this time, the connection strip 210 can be located along the edge of the plane barrier 220, because the connection with the plane barrier 220 is excellent at improving the airtightness and welding efficiency. The connecting strip 210 may also form a gap to relieve thermal stress. This is because it is important to relieve the thermal stress because the connection strip 210 is directly coupled to the reinforcement panel 120.

4 is a cross-sectional view along the line A-A in Fig. As shown in FIG. 4, the connecting strip 210 may be inserted outside the reinforcing panel 120. At this time, the upper surface of the reinforcing panel 120 and the upper surface of the connecting strip 210 have the same height so that the plane barrier 220 can be placed on the reinforcing panel 120 and the connecting strip 210. When the plane barrier 220 is placed on the connecting strip 210, it overlaps a certain portion. The process of joining the plane barrier 220 to the secondary insulation panel structure 100 by welding the boundary between the plane barrier 220 and the connection strip 210 is completed.

5 is a perspective view showing a state after the strip barriers 230 and 231 and the joint barriers 240 are coupled to the plane barriers 220 of the cargo hold of the liquefied gas carrier according to the embodiment of the present invention, And Fig. 7 is a cross-sectional view corresponding to Fig.

Since the secondary insulation panel structures 100 are spaced apart from each other, the plane walls 220 are also spaced apart. Thus, strip barriers 230, 231 are needed to connect the neighboring plane barriers 220. The strip barriers 230 and 231 have a strip shape in which both ends are attached to the edge of the plane barrier 220.

FIG. 5 illustrates that two lateral first strip walls 230 and two longitudinal second strip walls 231 are coupled to one plane barrier 220. FIG.

The strip barriers 230 and 231 include a first corrugation 234 to relieve thermal stress. The first corrugation 234 serves to relieve thermal stress by the corrugation when the secondary barrier structure 200 is shrunk. The first corrugation 234 may be located in a spaced apart space of the secondary insulation panel structure 100. This is because it is not necessary to form a separate groove in the secondary insulation panel structure 100 for forming the corrugation.

The plane barrier 220 and the strip barriers 230 and 231 may be connected to each other by welding. 7 illustrates that the plane barriers 220 and the strip barriers 230 and 233 are butted against each other. Alternatively, the strip barriers 230 and 231 may be welded to overlap the plane barriers 220.

A joint barrier 240 is attached to the end of the strip barrier 230, 231 to connect the neighboring strip barrier 230, 231. The shape of the joint barrier 240 may vary depending on the number of the secondary insulation panel structures 100 disposed on the outer wall of the ship. The embodiment of the present invention shows that four secondary insulation panel structures 100 are disposed adjacent to each other at one point so that the four strip walls 230 and 233 approach each other at right angles. More specifically, the first strip barrier 230 in the transverse direction and the second strip barrier 231 in the longitudinal direction approach each other. However, even if the strip barriers approach each other in a different shape, they may be attached to the ends of the strip barriers, thereby connecting the neighboring strip barriers to the embodiment of the present invention.

The joint barrier 240 includes a second corrugation 242 that extends the first corrugation 234 of the strip barrier 230,231. The extension of the first corrugation 234 means that it has the same direction as the first corrugation 234 and the curvature of the corrugation is constant and thus has continuity. Therefore, when welding the joint barriers 240 placed on the ends of the strip barriers 230, 231 to the strip barriers 230, 231, it is possible to weld them hermetically without creating a gap.

Also, when the first corrugation 234 approaches in different directions, the second corrugations 242 of the joint barrier 240 that extend them intersect each other. Due to the intersection point 243 (see FIG. 9), the auxiliary barrier structure 200 can be dispersed without concentrating thermal stress even if heat shrinkage occurs in any direction. That is, in the portion where the corrugation is not continuous, the thermal stress is concentrated and the fatigue accumulates, the structural stability of the auxiliary barrier structure 200 may be deteriorated. Therefore, the auxiliary barrier structure 200 of the present invention has the joint barrier 240 The second corrugations 242 of the corrugations 234 and 242 extend through the first corrugations 234 of the strip walls 230 and 231 while the second corrugations 242 of the corrugations 234 and 242 cross each other, . ≪ / RTI >

Fig. 8 is a perspective view showing the relationship between the strip barriers 230 and 231 and the joint barrier 240, and Fig. 9 is a plan view. 10 is a plan view showing a coupling relationship in which the joining order of the strip barrier and the joint barrier is different.

The secondary barrier structure 200 is intended to maximize the maintenance of airtightness, and next, the ease of installation is important. It is noted that the plane barrier 220 and the strip barriers 230 and 231 are welded together.

The strip barrier 230, 231 may be provided with a chamfer line 233 at the end edge 232. This is to facilitate welding when strip barriers 230, 231 in different directions meet. For example, if the end edges 232 are chamfered at a 45 degree angle in the case of the strip barriers 230, 231 which meet vertically with each other, the chamfer lines 233 of the strip barriers 230, As shown in Fig.

Figure 9 shows that the chamfer lines 233 are welded at intervals when welding the plane barrier 220 and the strip barrier 230, 231. This is due to the fact that it is practically difficult to weld the second strip barrier 231 in coincidence with the chamfer line 233 after the plane barrier 220 and the first strip barrier 230 have been welded so that the chamfer line 233 is spaced apart This is because they must be welded together.

The joint barrier 240 may include an end of the strip barrier 230, 231 therein. I. E., Overlap the strip barriers 230,231, thereby improving the quality of the weld. In addition, the outline 241 of the joint barrier 240 can pass between both ends of the chamfer line 233 where the strip barriers 230, 231 meet. This is for constant welding at the same height when welding the strip barriers 230, 231 and the joint barrier 240. If the outline 241 of the joint barrier 240 is located beyond one end of the chamfer line 233 where the strip barriers 230 and 233 meet, then there is a height difference between the plane barrier 220 and the strip barriers 230 and 231 So that the quality of the welding can be lowered.

FIG. 10 shows the coupling relationship of the strip barriers 230 and 231 and the joint barriers 240 in a different order. That is, the joint barrier 240 is first welded to the plane barrier 220 and the strip barrier 230, 231 is welded thereon. When welding the chamfered wires 233 of the stream barriers 230 and 231, the heights of the chamfered wires 233 are different from each other with respect to the outline 241 of the joint barrier 240.

As described above, the auxiliary barrier structure 200 according to the embodiment of the present invention can be easily installed while maximizing the quality of welding when the plane barrier 220, the strip barriers 230 and 231, and the joint barrier 240 are combined. The shape and positional relationship thereof is determined.

Also, the welding used to join the secondary barrier structure 200 of the present invention includes laser welding. Laser welding can produce an optimum effect for airtight welding of thin metal. For example, in case of welding the plane barrier 220 and the barrier ribs 230 and 233 by laser welding using an automatic machine, it is possible to maximize the quality of the welding while shortening the working time. Further, when welding the strip barrier 230 and the strip barrier 231 and welding the strip barriers 230 and 231 and the joint barrier 240, if the operator manually welds the laser, the quality of the fine welding operation will be maximized .

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.

100: secondary insulation panel structure, 110: secondary insulation panel,
120: reinforcing panel, 121: insertion groove,
200: auxiliary barrier structure, 210: connecting strip,
211: rivet, 212: rivet hole,
220: plane barrier, 230: first strip barrier,
231: second strip barrier, 232: end edge,
233: chamfer line, 234: first corrugation,
240: joint barrier, 241: outline,
242: second corrugation, 243: corrugation crossing point,

Claims (7)

A secondary insulation panel structure including a reinforcing panel which is stacked on and secured to an outer wall of the ship and spaced apart from each other; And
And an auxiliary barrier structure laminated and fixed on the secondary adiabatic panel structure,
The auxiliary barrier structure may include:
A connection strip having a plurality of gaps and engaging an edge of the reinforcing panel;
A plane barrier fixed on the secondary insulation panel structure and welded to the connection strip;
A strip barrier attached to an edge of the plane barrier; And
And a joint barrier attached to an end of the strip barrier,
Wherein the strip barrier comprises a first corrugation along a space between the secondary insulation panel structures spaced apart,
The joint barrier having a second corrugation extending a first corrugation of the strip barrier and a second corrugation extending in a different direction. delete The method according to claim 1,
Said strip barrier having a chamfer line at an angle of 45 degrees to an end edge,
Wherein the strip barrier wall which meets at right angles is welded in a state in which the chamfer lines coincide with each other. The method of claim 3,
The joint barriers,
The ends of the strip barriers meeting each other,
A cargo hold of a liquefied gas transportation vessel having an outer line passing between both ends of said chamfer line. A method of manufacturing a cargo hold of a liquefied gas transportation vessel for laminating and fixing the cargo from an outer wall of a ship in the order of a secondary insulation panel structure and an auxiliary barrier structure,
Wherein the secondary insulation panel structure comprises:
A secondary insulation panel is stacked and fixed, and a reinforcing panel is laminated and fixed on the upper surface of the secondary insulation panel.
The auxiliary barrier structure may include:
A connecting strip having a plurality of gaps at an edge of the reinforcing panel,
Fixing the plane barrier on the secondary adiabatic panel structure by welding the plane barrier and the connecting strip,
Placing both ends of the strip barrier at the edges of the plane barrier, combining the plane barrier with the strip barrier by welding,
Wherein a joint barrier is positioned so that an end of the adjacent strip barrier is contained therein and the strip barrier and the joint barrier are welded together by welding to produce a cargo hold of the liquefied gas transportation vessel. delete 6. The method of claim 5,
Wherein the joining of the plane barrier and the strip barrier and the joining of the strip barrier and the joint barrier are performed by laser welding in a method of making the auxiliary barrier structure.

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