KR20120136329A - Pump tower installation structure of lng storage tank, and method for manufacturing the same - Google Patents

Abstract

PURPOSE: A pump tower installation structure for a liquefied natural gas storage tank and a manufacturing method thereof are provided to effectively fix a pipe of a pump tower in an opening of an inner hull with a cover and an adapter. CONSTITUTION: A pump tower installation structure for a liquefied natural gas storage tank comprises an adapter(10) and a cover(20). The adapter is arranged in a constant area of an opening formed in an inner hull above a liquefied natural gas storage tank. One side of the adapter is connected to the inner hull. The cover has a through-hole corresponding to a pipe of a pump tower installed in a storage tank. The cover is arranged in a remaining area of the opening formed between the outer side of the adapter and the inner hull.

Description

Pump tower installation structure of LNG storage tank and its manufacturing method {PUMP TOWER INSTALLATION STRUCTURE OF LNG STORAGE TANK, AND METHOD FOR MANUFACTURING THE SAME}

The present invention relates to a pump tower installation structure of a liquefied natural gas storage tank and a manufacturing method thereof.

Liquefied natural gas (LNG) storage tanks of carriers store liquefied natural gas cooled to approximately -163 ° C, and are made of materials that can withstand cryogenic temperatures, and are resistant to thermal stress and heat shrinkage, and insulate structures that can block heat intrusion. Is made of. The storage tank has a primary barrier, an upper insulation board, a secondary barrier, and a lower insulation board in an outward direction from the inside of the tank, and is provided in a state coupled with an inner hull.

The storage tank is provided with a pump tower for unloading liquefied natural gas, the pump tower is composed of a pipe structure having a plurality of pipes. The pipes of the pump tower are installed in a direction penetrating the upper surface of the storage tank. At this time, the lower part of the pipe is disposed so as to face the bottom surface inside the storage tank, the upper part of the pipe protrudes above the storage tank is mounted in a state fixed to the hull side.

Typically, each pipe of the pump tower is fixed to the outer hull side when fixed to the hull side. As an example, Korean Laid-Open Patent Publication No. 10-2011-0026945 (published on March 16, 2011, hereinafter referred to as 'prior document') is a pipe upper part is fixed to the trunk deck (trunk deck) side corresponding to the outer hull finish The technology that mounts a pump tower in a manner has been disclosed.

In this case, however, the insulation construction must be additionally performed in the space formed between the outer hull and the inner hull, so that the pipe fixing structure and the fixing work may be complicated. In addition, since it is difficult to smoothly finish around the secondary barrier disposed between the inner hull and the primary barrier, a leak problem may occur. In addition, since the airtight holding part is exposed outside the outer hull in a state of wrapping the pipe protruding over the outer hull, the space efficiency of the surroundings can be reduced, and it can be easily exposed to various external impacts.

Patent Document: Korean Patent Publication No. 10-2011-0026945 (published Mar. 16, 2011)

An embodiment of the present invention is to provide a pump tower installation structure and a manufacturing method of the liquefied natural gas storage tank that can be efficiently fixed and installed the pipe of the pump tower.

According to an aspect of the invention, the adapter is disposed in a predetermined region of the opening formed in the inner hull of the liquefied natural gas storage tank, one side is connected to the inner hull; And a cover provided in the through hole corresponding to the pipe of the pump tower installed in the storage tank, the cover being disposed in the remaining area of the opening formed between the other side of the adapter and the inner hull of the liquefied natural gas storage tank. A pump tower mounting structure can be provided.

The cover may include a first region in contact with the other side of the adapter and having the through hole formed therein, and a second region extending from the first region in contact with the inner hull.

The first region may be provided with a heat insulating board for a cover formed in the lower portion of the lower portion of the lower portion, and the heat insulating construction may be made in the periphery of the cover heat insulating board.

The cover insulation board includes a plurality of insulation blocks, each insulation block having a first protection plate attached to the lower portion of the first area, an insulation member provided below the protection plate, and a second attachment to the lower insulation member. It may include a shroud.

An adjusting protective plate attached to the lower portion of the second protective plate by the adhesive layer and the adhesive layer may be provided below the second protective plate.

It may further include a heat insulation layer disposed between the lower insulation board and the cover insulation board provided in the lower inner hull.

The insulation layer includes a plurality of insulation blocks, and at least one insulation block of the insulation blocks may be attached to the lower portion of each of the adapter and the second region by an adhesive.

The adapter may further include a vertical finishing part bonded to the lower part of the adapter and the cover in a vertical direction, and an adjusting finishing part fixed to the vertical finishing part to be disposed on the same plane as the heat insulating layer.

The adjustment finish portion may be provided in a cross-sectional shape '└' shape.

A main secondary barrier provided under the lower insulation board and an auxiliary secondary barrier overlapped and joined to the adjustment finishing part, and the main secondary barrier to be coplanar with the upper insulation board below the main secondary barrier. The connection board may further include a connection board provided under the at least one of the auxiliary secondary barrier and the heat insulation layer.

The primary barrier may be stacked on the bottom surface of the cover insulation board, the connection board and the upper insulation board on the same plane.

The adapter, the inner hull and the cover may be joined to each other by welding.

The adapter may be provided to correspond to the size of the remaining area of the opening excluding the area occupied by the cover in the opening.

According to another aspect of the invention, (a) disposing the adapter in a predetermined region of the opening; (b) a cover insulation board including a first region in which the through hole is formed and a second region extending from the first region to contact the inner hull, and formed below the opening in a lower portion of the first region; Disposing the prepared cover in the remaining area of the opening; And (c) performing at least one barrier installation work and a heat insulation work on the periphery of the cover insulation board. A method of manufacturing a pump tower installation structure of a liquefied natural gas storage tank may be provided.

In the step (c), the step (c) includes welding and joining a vertical finishing part in a vertical direction to the lower part of the adapter and the cover, and forming a heat insulation layer between the lower insulation board provided under the inner hull and the insulation board for cover. And arranging, and fixing the adjustment finishing part to the vertical finishing part to be disposed on the same plane as the insulating layer.

The disposing of the insulating layer may include attaching a first insulating block of the insulating layer to the lower portion of the second area of the adapter and the cover so as to contact the vertical finishing part, and the first insulating block and the lower insulating layer. It may include the step of disposing a second insulating block of the insulating layer between the board or the first insulating block and the insulating board for the cover.

After arranging the heat insulation layer, bonding the secondary secondary barrier to overlap the main secondary barrier provided below the lower insulation board and the control dead portion; and the same as the upper insulation board below the primary secondary barrier. Arranging a connection board under the at least one of the main secondary barrier, the auxiliary secondary barrier, and the heat insulation layer so as to lie on a plane; and the heat insulation board for the cover, the connection board, and the upper part on the same plane. The method may further include stacking a primary barrier on a lower surface of the insulation board.

Pump tower installation structure of the liquefied natural gas storage tank according to an embodiment of the present invention and a manufacturing method thereof can efficiently fix and install the pipe of the pump tower in the opening formed in the inner hull by the cover and the adapter.

In addition, by insulating the periphery of the insulation board for the cover of the cover lower portion formed in the lower side of the opening can be effectively finished insulated structure of the storage tank in the inner hull.

In addition, by installing an adapter provided to correspond to the size of the remaining area of the opening excluding the area occupied by the cover in the area (gap) generated between the inner hull and the cover, the tolerance problem between the inner hull and the cover can be effectively solved.

1 is a plan view showing a pump tower installation structure of a liquefied natural gas storage tank according to an embodiment of the present invention.
2 is a cross-sectional view showing a pump tower installation structure of the liquefied natural gas storage tank of FIG.
3 is a cross-sectional view showing another example of the installation structure of the pump tower of FIG.
4 to 8 are sectional views showing the manufacturing process of the pump tower installation structure of FIG.

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 numbers refer to like elements throughout.

1 and 2, the liquefied natural gas storage tank 1 (hereinafter referred to as "storage tank") according to an embodiment of the present invention forms an opening (H) in the inner hull (2) of the upper And a pump tower installed through the opening (H). The pump tower may typically consist of a pipe structure with a plurality of pipes (P), for example two discharge pipes, one filling pipe and one emergency for unloading liquid cargo. It may be made of a pipe structure having a plurality of pipes (P) including an pipe (emergency pipe). The installation structure of the pump tower of the storage tank 1 according to the embodiment of the present invention for the installation of the pump tower includes an adapter 10, a cover 20, a heat insulating layer 40 and the adjustment closing portion 102.

The adapter 10 is disposed in a predetermined region S1 (see FIG. 4) of the opening H, and one side is connected to the inner hull 2. Hereinafter, the adapter 10 is described as an example of being connected to the inner hull 2 on the stern side, but as another example, one side may be connected to the inner hull 2 on the bow side. Here, the inner hull 2 on the stern side may be formed at the corner side of the storage tank 1.

The adapter 10 may be manufactured in advance to correspond to the size of the remaining area of the opening H except for the area occupied by the cover 20. This is to effectively solve the tolerance problem between the cover 20 and the inner hull 2 occupying the opening (H). In addition, the adapter 10 may be provided of the same material as the inner hull (2). The adapter 10 may be a flat plate made of a metal material such as stainless steel, for example. The adapter 10 may be disposed on the same plane as the inner hull 2.

The cover 20 provides a plurality of through holes 2a corresponding to each pipe P of the pump tower installed in the storage tank 1. Here, the cover 20 may be provided with the through-hole (2a) for the liquid pipe, the valve, the various layer equipment as well as the pipe of the pump tower for the liquid cargo unloading described above. The cover 20 is disposed in the remaining area S2 (see FIG. 4) of the opening H formed between the other side of the adapter 10 and the inner hull 2 on the bow side. In this case, the adapter 10, the inner hull 2 and the cover 20 may be joined to each other by welding (W). That is, the contact portion between the inner hull 2 of one side and the stern side of the adapter 10, the other side of the adapter 10 and the cover 20, and the inner hull 2 of the cover 20 and the bow side is welded ( W) are joined.

In addition, the cover 20 supports the pipe P in a state of closing the opening H, and may be provided as a flat plate having a smaller area than the area of the opening H, for example. The cover 20 may be disposed on the same plane as the adapter 10 and the inner hull 2. The cover 20 is in contact with the other side of the adapter 10 and extends from the first region S3 having the through-hole 2a and the first region S3 to contact the inner hull 2 on the bow side. It may include a second area (S4). Here, the first region S3 is provided with a cover insulation board 30 formed below the opening H.

The cover insulation board 30 may be provided in the form of a plurality of insulation blocks. Each of the insulating blocks includes a first protective plate 31 attached to the lower portion of the first region S3 by an adhesive M such as mastic, an insulating member 32 provided under the first protective plate 31, and thermal insulation. And a second protective plate 33 attached to the bottom of the member 32. The cover insulation board 30 is disposed on the same plane as the upper insulation board 70 and the connection board 80 to be described later.

The heat insulation layer 40 is disposed between the lower insulation board 50 and the cover insulation board 30 respectively provided below the inner hull 2 on the stern side and the inner hull 2 on the bow side. The lower insulation board 50 provided below the inner hull 2 on the stern side may be disposed at the corner side of the storage tank 1 and extends to a predetermined portion of the lower portion of the adapter 10 to be joined by an adhesive M. Can be. The lower insulation board 50 provided below the inner hull 2 on the bow side may extend to a predetermined portion of the second region S4 of the cover 20 to be bonded by the adhesive M. FIG.

At this time, the auxiliary secondary barrier 62 overlaps the main secondary barrier 61 provided below the lower insulation board 50 and the adjustment dead end portion 102 to form a sealed structure. The primary secondary barrier 61 and the secondary secondary barrier 62 have a very thin thickness and hardly generate a step, and may be disposed on the same plane with each other.

In addition, the connection board 80 is provided under the secondary secondary barrier 62 so as to be interposed between the upper insulation board 70 and the cover insulation board 30 under the primary secondary barrier 61.

The above-described heat insulating layer 40 is provided in the form of a plurality of heat insulating blocks (41 ~ 43), the other heat insulating block (41 ~ 43) both sides of the other heat insulating blocks in contact with the cover heat insulating board 30 and the lower heat insulating board (50). The first insulating blocks 43 surrounded by the 41 and 42 are attached to the adapter 10 and the lower portion of the second region S4 by the adhesive agent M, respectively. Here, the insulating blocks 41 and 42 may be provided in the form of, for example, glass wool.

The lower insulation board 50 is disposed between the inner hull 2 and the main secondary barrier 61, and includes a lower protection plate 51 and a lower insulation member 52. The lower protective plate 51 may be made of, for example, a material such as plywood. The lower insulation member 52 is made of, for example, a polyurethane foam (PUF, Polyurethane Form) to protect the hull from the cryogenic fluid. The lower insulation member 52 may be bonded to the lower portion of the lower protective plate 51 by an adhesive (for example, glue).

In addition, the upper insulation board 70 is disposed between the primary barrier 90 and the main secondary barrier 61, and includes an upper insulation member 72 and an upper protective plate 71. The upper insulation member 72 may be made of the same material as the lower insulation member 52, and the upper protection plate 71 may be made of the same material as the lower protection plate 51.

In addition, the primary barrier 90 is formed in direct contact with the liquefied natural gas and has a high airtightness, and when the contact with the cryogenic liquefied natural gas occurs, heat shrinkage occurs, and when the heat shrinkage occurs, the welded portion is damaged due to thermal stress. It can be formed to maintain a low in-plane stiffness to prevent it. The primary barrier 90 is formed to have a wrinkled portion 90a, and the wrinkled portion 90a is deformed by a certain amount when heat shrinkage occurs, thereby reducing thermal stress at the welded portion. The primary barrier 90 may be made of a metal material such as stainless steel.

In addition, the primary secondary barrier 61 and the secondary secondary barrier 62 may be composed of a plurality of sheets made of metal materials such as stainless steel, aluminum, brass, zinc, and the like. As another example, the primary secondary barrier 61 may be composed of a composite sheet composed of a metal sheet and a fiber reinforced composite material.

In addition, the connection board 80 includes a connection protection plate 81 and a connection insulation member 82, the connection insulation member 82 is made of the same material as the lower insulation member 52, the connection protection plate 81 is It may be made of the same material as the lower protective plate 51.

Adjusting the closing portion 102 is fixed to the height adjustable to the vertical closing portion 103 side bonded to the vertical direction in the adapter 10 and the lower cover 20. At this time, the adjustment closing portion 102 is fixedly installed on the vertical finishing portion 103 side to be disposed on the same plane as the peripheral insulating layer (40, 50). The vertical finishing unit 103 may be formed integrally with the adapter 10 and the cover 20 or may be manufactured separately and fixed by welding. In addition, the adjustment closing portion 102 may be fixed to the vertical closing portion 103 by welding, the cross-sectional shape may be provided in a '└' shape.

Meanwhile, referring to FIG. 3, the above-described cover insulation board 30 is attached to the lower portion of the second protective plate 33 by the adhesive layer 34 and the adhesive layer 34 on the lower portion of the second protective plate 33 as another example. An adjustable protective plate 36 may be included. This is to allow the cover insulation board 30 and the connection board 80 to be disposed on the same plane by adjusting the height using the adjusting protective plate 36 before the adhesive layer 34 is cured.

Hereinafter, a process of manufacturing a pump tower mounting structure of the storage tank 1 will be described with reference to FIGS. 1 and 2 through FIGS. 4 to 8.

First, as shown in FIG. 4, the adapter 10 having one side connected to the inner hull 2 on the stern side is disposed in the predetermined region S1 of the opening H. Here, the inner hull 2 on one side and the stern side of the adapter 10 may be joined by welding.

Next, as shown in FIG. 5, the lower insulation board 50, the main secondary barrier 61, and the upper insulation board 70 are provided in the corner of the inner hull 2 side of a stern side. Here, the inner side surfaces of the lower insulation board 50, the main secondary barrier 61, and the upper insulation board 70, which are installed at the corners of the storage tank 1, may be curved to prevent concentration of stress. have.

Next, as shown in FIG. 6, a cover insulation board 30 is provided at the lower portion, and extends from the first region S3 and the first region S3 in which the through hole 2a is formed, and is located on the side of the bow. The cover 20 including the second area S4 in contact with the inner hull 2 is disposed in the remaining area S2 of the opening H. In this case, the adapter 10, the cover 20 and the inner hull 2 may be joined by welding a portion that is in contact with each other. In addition, the cover 20 may be installed in a state in which the insulating block B (see FIG. 7) in contact with the interface of the adapter 10 is removed. The effect is to prevent damage to the insulation by the heat of welding. Then, the vertical finishing portion 103 is bonded to the adapter 10 and the lower cover 20.

Next, as shown in FIG. 7 and FIG. 8, at least one barrier installation work and a heat insulation work are performed at the periphery of the cover insulation board 30. To this end, first, the lower insulation board 50, the main secondary barrier 61, the upper insulation board 70 is installed below the inner hull 2 on the bow side.

Next, a heat insulation layer 40 is disposed between the lower insulation board 50 and the cover insulation board 30 provided below the inner hull 2 on the stern side and the inner hull 2 on the bow side. At this time, the first insulating block 43 of the heat insulating layer 40 is attached to the lower portion of the second region S4 of the adapter 10 and the cover 20 by the adhesive agent M so as to contact the vertical finishing part 103. Let's do it. In addition, another heat insulating block 41 of the heat insulating layer 40 is disposed between the first heat insulating block 43 and the lower heat insulating board 50. In addition, the first insulating block is fixed in the state in which the adjustment block 102 is fixed to the vertical finish section 103 side, and the insulating block (B) in contact with the interface of the adapter 10 of the cover insulating board 30 is installed. The remaining insulation block 42 of the insulation layer 40 is disposed between the 43 and the insulation block B of the insulation board 30 for the cover.

Next, the secondary secondary barrier 62 is bonded to the primary secondary barrier 61 and the adjustment closing portion 102 under the lower insulation board 50.

Next, the secondary secondary barrier 62 is interposed between the upper insulation board 70 and the cover insulation board 30 below the primary secondary barrier 61 so as to be coplanar with the upper insulation board 70. Place the connection board 80 at the bottom.

Next, the primary barrier 90 is laminated on the lower surface of the cover insulation board 30, the connection board 80, and the upper insulation board 70 on the same plane.

As described above, the insulation structure of the storage tank 1 in the inner hull 2 may be effectively finished by heat insulating the periphery of the cover insulation board 30 under the cover 20 formed under the opening H.

The foregoing has shown and described specific embodiments. However, it is to be understood that the present invention is not limited to the above-described embodiment, and various changes and modifications may be made without departing from the scope of the technical idea of the present invention described in the following claims It will be possible.

1: storage tank 2: inner hull
30: insulation board for cover 36: protective cover for adjustment
40: insulation layer 50: lower insulation board
61: primary secondary barrier 62: secondary secondary barrier
70: upper insulation board 80: connection board
90: primary barrier 102: adjustment finish
103: vertical finishing part
M: Adhesive H: Opening

Claims (17)

An adapter disposed in a predetermined region of an opening formed in an inner hull above the liquefied natural gas storage tank, and one side of which is connected to the inner hull; And
A cover having a through hole corresponding to a pipe of a pump tower installed in the storage tank, the cover being disposed in the remaining area of the opening formed between the other side of the adapter and the inner hull; Tower installation structure. The method of claim 1,
The cover is installed in the pump tower of the liquefied natural gas storage tank including a first region in contact with the other side of the adapter and the through hole is formed, and a second region extending from the first region to contact the inner hull. The method of claim 2,
The first region is provided with a cover insulation board formed under the opening in the lower portion, the pump tower of the liquefied natural gas storage tank in which the heat insulation is made in the periphery of the cover insulation board. The method of claim 3,
The cover insulation board includes a plurality of insulation blocks, each insulation block having a first protection plate attached to the lower portion of the first area, an insulation member provided below the protection plate, and a second attachment to the lower insulation member. Pump tower installation structure of LNG storage tank including protective plate. 5. The method of claim 4,
A pump tower installation structure of a liquefied natural gas storage tank provided with an adhesive layer and a control plate attached to the lower portion of the second protective plate by the adhesive layer under the second protective plate. The method of claim 3,
The pump tower installation structure of the liquefied natural gas storage tank further comprises a heat insulation layer disposed between the lower insulation board and the cover insulation board provided under the inner hull. The method according to claim 6,
The insulating layer includes a plurality of insulating blocks, wherein at least one of the insulating blocks of the pump tower of the liquefied natural gas storage tank is attached to the lower portion of the adapter and the second area by the adhesive. The method according to claim 6,
A vertical finishing part joined to the adapter and the cover in a vertical direction;
The pump tower installation structure of the liquefied natural gas storage tank further comprises an adjustment finishing portion fixed to the vertical finishing portion to be disposed on the same plane as the insulating layer. 9. The method of claim 8,
The adjustment finish portion is a pump tower installation structure of the LNG storage tank having a cross-sectional shape '└' shape. 9. The method of claim 8,
A secondary secondary barrier overlapping and bonded to the primary secondary barrier provided below the lower insulation board and the adjustment finish part;
The liquefied natural gas storage tank further comprises a connection board provided under the at least one of the main secondary barrier, the auxiliary secondary barrier and the heat insulating layer so as to be on the same plane as the upper insulation board below the main secondary barrier. Pump tower installation structure. The method of claim 10,
A pump tower installation structure of a liquefied natural gas storage tank having a primary barrier laminated on a lower surface of the cover insulation board, the connection board, and the upper insulation board on the same plane. The method of claim 1,
The adapter, the inner hull and the cover is a pump tower installation structure of the LNG storage tank in which the parts in contact with each other are joined by welding. The method of claim 1,
The adapter is a pump tower installation structure of the LNG storage tank provided to correspond to the size of the remaining area of the opening excluding the area occupied by the cover in the opening. In the method for producing a pump tower installation structure of the liquefied natural gas storage tank according to any one of claims 1 to 13,
(a) disposing the adapter in a predetermined region of the opening;
(b) a cover insulation board including a first region in which the through hole is formed and a second region extending from the first region to contact the inner hull, and formed below the opening in a lower portion of the first region; Disposing the prepared cover in the remaining area of the opening; And
(c) performing at least one barrier installation work and insulation work around the insulation board for cover; 15. The method of claim 14,
The step (c) is a step of welding and joining the vertical finishing portion in the vertical direction to the adapter and the lower cover,
Disposing an insulation layer between the lower insulation board and the cover insulation board provided under the inner hull;
Method of manufacturing a pump tower installation structure of a liquefied natural gas storage tank comprising the step of fixing the adjustment to the vertical closing portion to be disposed on the same plane as the heat insulating layer. 16. The method of claim 15,
Disposing the heat insulation layer,
Attaching a first insulating block of the insulating layer to the lower portion of the second area of the adapter and the cover so as to contact the vertical finishing part;
Producing a pump tower installation structure of the liquefied natural gas storage tank comprising the step of disposing a second insulating block of the insulating layer between the first insulating block and the lower insulating board or the first insulating block and the cover insulating board. How to. 16. The method of claim 15,
After placing the thermal insulation layer,
Bonding a secondary secondary barrier to overlap the primary secondary barrier provided below the lower insulation board and the control dead portion;
Arranging a connection board below at least one of the main secondary barrier, the auxiliary secondary barrier, and the heat insulation layer so as to be coplanar with the upper insulation board below the main secondary barrier;
Laminating a primary barrier on the lower surface of the insulation board, the connecting board and the upper insulation board for the cover on the same plane manufacturing method of the pump tower installation structure of the LNG storage tank.

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