KR20240029398A - Liquid dome chair and vessel comprising the same - Google Patents

Abstract

The present invention is a chair body provided with at least one chair body arranged at regular intervals in the bow direction of the liquid dome to support the load of the membrane, a fixing stud connected to the chair body and fixed to the membrane sheet, and at least one chair body. It includes a connecting member connecting in series, and the chair body on which the fixing studs are installed and the chair body on which the fixing studs are not installed are positioned alternately.

Description

Liquid dome chair and vessel comprising the same {Liquid dome chair and vessel comprising the same}

The present invention relates to a liquid dome chair and a ship including the same, and more specifically, to a chair for fixing an insulation box located at the periphery of the liquid dome.

With the development of seabed mining technology, drilling facilities equipped with drilling equipment suitable for the development of small marginal fields or deep-sea oil fields have been developed.

To produce and transport natural gas and petroleum gas buried on the seabed, offshore drilling production facilities, liquefied natural gas carriers (LNGCs), and liquefied natural gas-floating production storage and offloading facilities (LNG-Floating Production Storage and Offloading) are used. , LNG-FPSO) and liquefied natural gas-floating storage and regasification unit (LNG-FSRU) are used.

A liquefied natural gas carrier (LNGC) refers to a special vessel that carries and transports liquefied natural gas at extremely low temperatures (-163 degrees Celsius), and a liquefied natural gas-floating production and storage facility (LNG-FPSO) is used to transport existing gas production. It refers to a multi-function vessel that combines an offshore structure for gas production with facilities that can liquefy and store the produced gas directly at sea. Previously, when gas was produced in an offshore gas field, the produced gas had to be transported by pipeline to an onshore liquefied storage facility, then liquefied and stored in the onshore liquefied storage facility, and then shipped to a carrier, so it was stored in an onshore liquefied storage facility. Because the cost of constructing facilities and pipelines was high, it was only economically feasible for large-scale gas fields.

However, using a liquefied natural gas-floating production and storage facility (LNG-FPSO), it is possible to liquefy and store gas directly at an offshore gas production site and load it onto a gas carrier, eliminating the cost of constructing an onshore liquefied storage facility and pipeline. As a result, the construction cost of production facilities can be significantly reduced, and as a result, it has the advantage of securing economic feasibility for the development of small and medium-sized gas fields.

In liquefied natural gas carriers, one liquid dome is provided in each cargo hold, and a pump tower is provided at the bottom of the liquid dome. This liquid dome is located at the top of the liquefied natural gas cargo hold and forms part of the cargo hold as a passage for loading and unloading the liquefied natural gas cargo.

Meanwhile, the invar (sealing wall or barrier) around the liquid dome becomes a discontinuous section due to the liquid dome box. Accordingly, a chair is needed that transfers the bending and heat transfer from the invar to the hull.

As shown in Figures 1 and 2, 11 of these chairs are arranged at regular intervals on the bow side of the liquid dome, support the membrane load, and are attached by welding to the inner hull plate to form a secondary box. It plays a role in fixing the membrane that passes between the and primary box.

As shown in Figure 2, the conventional chair is arranged to support the load of the membrane by alternately arranging chairs involved in fixation and chairs not involved in fixation, and has surrounding elements (for example, at least one or more Parts such as stoppers) are combined in a very complex way compared to their functions, making design and installation work cumbersome and requiring special attention.

The present invention was created to solve the problems of the prior art as described above. The purpose of the present invention is to implement the surrounding elements of the chair into a simple structure to facilitate design and installation work, reduce manufacturing costs, and shorten the process time. The purpose is to provide ships with

The vessel of the liquefied gas storage tank according to an embodiment of the present invention has at least one chair body arranged at regular intervals in the bow direction of the liquid dome to support the load of the membrane, connected to the chair body and fixed to the membrane sheet. It includes a fixing stud and a connecting member for connecting at least one chair body in a row, and the chair body on which the fixing stud is installed and the chair body on which the fixing stud is not installed are positioned alternately. .

According to one embodiment of the present invention, the chair body includes a base plate, a side wall plate coupled to both sides of the base plate, a support plate coupled to the base plate and coupled to the inner surface of the side wall plate, and the base plate. It may be characterized by an upper plate coupled to the upper part, and the fixing stud connected through the upper plate and the base plate.

According to one embodiment of the present invention, the connecting member may be coupled to the side of at least one chair body to connect the chair bodies to each other.

According to another embodiment of the present invention, the connecting member may be coupled to the center of at least one chair body to connect the chair bodies to each other.

According to another embodiment of the present invention, the connecting member may be formed to completely surround the outer surface of the chair body arranged in a row, and the fixing stud may be positioned to penetrate.

According to one embodiment of the present invention, it may be made of a ship including the liquid dome chair of the liquefied gas storage tank of the present invention.

According to one embodiment of the present invention, the cargo loaded on the ship may be LNG.

By implementing a simple structure of the surrounding elements of the liquid dome chair according to the present invention, design and installation work is easy, and it is possible to provide a ship that can reduce manufacturing costs and shorten process time.

Figure 1 is a diagram schematically showing installation of a liquid dome box using a conventional chair.
Figure 2 is a diagram of a conventional chair, showing a chair involved in fixation and a chair not involved in fixation.
Figure 3 is a diagram showing an insulation structure around a liquid dome in a liquefied gas storage tank according to an embodiment of the present invention.
Figure 4 is a cross-sectional view showing an insulation structure around a liquid dome according to an embodiment of the present invention.
Figure 5 is a diagram showing a fixing stud coupled to the chair body of a liquid dome chair according to an embodiment of the present invention.
Figure 6 is a perspective view showing a liquid dome chair according to an embodiment of the present invention.
Figure 7 is a perspective view showing a liquid dome chair according to another embodiment of the present invention.
Figure 8 is a perspective view showing a liquid dome chair according to another embodiment of the present invention.

The objectives, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments taken in conjunction with the accompanying drawings. In this specification, when adding reference numbers to the components of each drawing, it should be noted that the same components are given the same number as much as possible even if they are shown in different drawings. Additionally, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

In addition, the attached drawings are only for easy understanding of the embodiments disclosed in this specification, and the technical idea disclosed in this specification is not limited by the attached drawings, and all changes included in the spirit and technical scope of the present invention are not limited. , should be understood to include equivalents or substitutes.

Additionally, terms containing ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

Hereinafter, in this specification, the cargo loaded on the ship is limited to LNG, and due to the characteristics of LNG, it is preferable that the materials in the cargo hold are made of stainless steel (SUS) and Invar.

In addition, the use of the terms 'primary' and 'secondary' in the present invention refers to the function of primarily sealing or insulating LNG based on the LNG stored in the storage tank, or the function of sealing or insulating secondarily. It was used as a criterion for classification as to whether or not to do so.

Additionally, by convention, the terms 'top' or 'above' applied to elements of a tank refer to a direction towards the inside of the tank, regardless of the direction with respect to gravity, and likewise, the terms 'bottom' or 'below' refer to a direction towards the inside of the tank, regardless of the direction with respect to gravity. Regardless of the direction, it points towards the outside of the tank.

Hereinafter, the present invention will be described in detail by explaining preferred embodiments of the present invention with reference to the accompanying drawings. The same reference numerals in each drawing indicate the same member.

It is to be noted that the ship equipped with the liquefied gas storage tank described below, although not shown, is a concept that encompasses not only merchant ships that transport cargo from the origin to the destination, but also marine structures that float at a certain point on the sea and perform specific tasks. In addition, it should be noted that the liquefied gas storage tank in the present invention includes any type of tank that stores liquefied gas.

Figure 3 is a diagram showing the insulation structure around the liquid dome in a liquefied gas storage tank according to an embodiment of the present invention, and Figure 4 is a cross-sectional view showing the insulation structure around the liquid dome according to an embodiment of the present invention. It is a drawing, and Figure 5 is a diagram showing the fixed studs coupled to the chair body of the liquid dome chair according to an embodiment of the present invention, and Figure 6 is a perspective view of the liquid dome chair according to an embodiment of the present invention. It is a drawing, and Figure 7 is a perspective view showing a liquid dome chair according to another embodiment of the present invention, and Figure 8 is a perspective view showing a liquid dome chair according to another embodiment of the present invention.

First, referring to FIGS. 3 to 5, the liquefied gas storage tank of the present invention is installed on the outside of the primary barrier 400, the primary barrier 400, and a plurality of primary insulation panels in contact with the liquefied gas. A primary insulation wall 500 consisting of, a secondary barrier 600 installed on the outside of the primary insulation wall 500, and a secondary insulation wall 700 arranged on the inner wall of the hull and made of a plurality of secondary insulation panels. It may be composed of a double barrier structure including. Additionally, the liquefied gas storage tank may be supported on the hull by mastic, which is an adhesive member, and studs, which are fixing members, installed between the secondary insulation wall 700 and the hull.

The liquefied gas storage tank may need to optimize the thickness of the primary insulation wall 500 and secondary insulation wall 700 in order to optimize insulation performance and storage capacity. For example, when polyurethane foam is used as the main material of the primary insulation wall 500 and the secondary insulation wall 700, the thickness of the primary insulation wall 500 and the thickness of the secondary insulation wall 700 are combined. The overall thickness can range from 250mm to 500mm.

In the above, the liquefied gas storage tank may include a flat and corner structure. For example, the horizontal walls in the front and rear directions of a liquefied gas storage tank, the floor between the horizontal walls, the vertical walls, and the ceiling may correspond to a planar structure. Additionally, a structure where the horizontal walls, floor, vertical walls, and ceiling of a liquefied gas storage tank meet may correspond to a corner structure. Here, the corner structure may include an obtuse angle corner structure or a right angle corner structure.

First, the primary insulation wall 500 is designed to block heat intrusion from the outside and withstand shock from the outside or shock from internal liquefied gas sloshing, and the primary barrier 400 and secondary barrier It can be installed between (600). The primary insulation wall 500 may have a structure in which primary plywood and primary insulation are sequentially stacked on the outside of the primary barrier 400, and the thickness of the primary plywood and the thickness of the primary insulation are combined. It may correspond to thickness. Additionally, the primary insulation material may be formed of polyurethane foam between the primary plywood and the secondary barrier 600.

The secondary insulation wall 700 may be fixed to the inner wall of the hull using an adhesive such as epoxy mastic and studs, and the primary insulation wall 500 may be fixed between the secondary insulation wall 700 and the secondary insulation wall 700. With the secondary barrier 600 interposed, it can be fixed in close contact with the upper part of the secondary barrier 600 using a securing device provided on the upper part of the secondary insulation wall 700. At this time, the primary insulation panels constituting the primary insulation wall 500 and the secondary insulation panels constituting the secondary insulation wall 700 may be arranged so that their edges are offset from each other.

Primary and secondary insulation panels are made of polyurethane foam (PUF) or reinforced polyurethane foam (R-PUF) on the top or bottom, or on both the top and bottom of plywood or composite materials (e.g., fiber-reinforced plastic). It can be prepared as a sandwich panel by bonding a protective plate made of.

As in the conventional NO 96 type storage tank, an insulation box filled with insulation material inside a plywood box is called a box type insulation layer, and as in the conventional MARK Ⅲ type storage tank or the present invention, it is made in a sandwich form using polyurethane foam. The insulation panel provided is sometimes classified into a panel type insulation layer.

The secondary insulation panel may be manufactured, for example, as a unit panel in the shape of a hexahedron, and may be continuously arranged along the transverse and longitudinal directions on the inner wall of the hull (H) to form the secondary insulation wall 700. Similarly, the primary insulation panel can be manufactured as a unit panel in the form of a hexahedron, and is continuously arranged along the horizontal and longitudinal directions on the secondary barrier 600 to form the primary insulation wall 500.

Membranes made of metal can be used as the primary and secondary barriers (400, 600). Specifically, they can be made of various metal materials that are resistant to low-temperature brittleness, such as Invar, stainless steel (SUS), or aluminum alloy. This can be achieved by selectively adopting any one. In addition, the cargo loaded on the ship of the present invention is limited to LNG, and is preferably made of stainless steel and Invar.

In a preferred embodiment of the present invention, the primary barrier 400 may be made of a corrugated membrane made of stainless steel, and the secondary barrier 600 may be made of a flat membrane made of Invar material.

The primary barrier 400 is sealed by direct contact with the liquefied gas contained inside the storage tank, and may include a plurality of wrinkles that rise toward the inside of the storage tank, and the plurality of wrinkles are caused by heat contraction due to cryogenic temperatures. Prevents stress from concentrating on the membrane by absorbing .

Specifically, the primary barrier 400 may be composed of a plurality of primary membrane sheets including wrinkles. The primary barrier 400 may be welded to a metal plate such as an anchor strip provided on the top of the primary insulation wall 500, where the edges of adjacent primary barriers 400 overlap each other and are welded. can form a seal.

The secondary barrier 600 is installed between the primary insulation wall 500 and the secondary insulation wall 700, and is preferably made of a flat membrane in a flat shape to avoid interference with the upper and lower insulation walls. It may be made of an Invar membrane with a relatively small heat contraction coefficient.

Specifically, the secondary barrier 600 may be composed of a plurality of secondary membrane sheets called invar strakes. The secondary barrier 600 is provided in a strip shape to extend long along the longitudinal direction of the storage tank, and can be continuously welded to a tongue member installed on the upper part of the secondary insulation wall 700 to form a seal. . At this time, the secondary barrier 600 may be provided with an edge bent upward for welding with the tongue member.

In this way, in the present invention, the primary insulation wall 500 and the secondary insulation wall 700 are composed of an insulation panel made of polyurethane foam, and the secondary barrier 600 can be provided with a metal membrane, thereby improving insulation performance. Together with this, it is possible to achieve the effect of improving structural stability.

First, the liquid dome of the present invention is installed close to the stern bulkhead of the liquefied gas storage tank, that is, the rear wall of the storage tank. The liquid dome is prepared by forming a square-shaped opening on the inner side of the hull, and a liquid dome box is installed and sealed in the opening of the liquid dome. This is to enable more efficient suction of the liquefied gas at the bottom of the storage tank under ship trim conditions.

In addition, highly rigid primary and secondary insulation boxes are arranged around the liquid dome, and it has a structure in which primary and secondary space insulation and primary and secondary insulation panels are arranged sequentially in the direction away from the liquid dome. You can.

Meanwhile, according to one embodiment of the present invention, a Liquid Dome Chair is installed on the bow side of the liquid dome in the liquefied gas storage tank. The liquid dome chair is a structure to support a load by fixing a membrane that is cut off by a liquid dome, and includes a secondary insulation box attached to the inner hull by welding and installed at the level of the secondary insulation wall 700. The secondary membrane passing between the primary insulation boxes installed at the level of the primary insulation wall 500 is fixed.

As shown in Figures 3 to 8, in this embodiment, the liquid dome chair is arranged at least one at regular intervals in the bow direction of the liquid dome to support the load of the membrane, the chair body 100, the chair body 100 ) and a fixing stud 200 that is connected to the membrane sheet and fixed to the membrane sheet, and a connecting member 300 that connects at least one chair body 100 in a row.

First, a primary insulation wall 500 is located inside the chair body 100 of the liquid dome chair according to an embodiment of the present invention, and a primary insulation wall 500 is also located on both sides of the upper surface of the chair body 100. ) can be located. The upper plate 140 of the chair body 100, which will be described later, may be prepared by welding with the primary insulation wall 500.

The chair body 100 of the liquid dome chair of the present invention includes a base plate 110, a side wall plate 130 coupled to both sides of the base plate 110, and a side wall plate 130 coupled to the base plate 110. ) and a support plate 120 coupled to the inner surface of the base plate 110 and an upper plate 140 coupled to the top of the base plate 110.

Specifically, the chair body 100 of the liquid dome chair of the present invention has a base plate 110 and an upper plate 140 combined, a fixing stud 200 is inserted into the upper part, and the end is a side wall plate 130. It may be welded and provided with a structure coupled to the support plate 120 at the lower part.

In this way, the chair body 100 of the dome chair is prepared as a chair having one shape by welding the base plate 110, support plate 120, side wall plate 130, and top plate 140 together. This has the effect of shortening time and reducing costs at the same time.

Meanwhile, the chair body 100 of the present invention has a fixing stud 200 penetrating the support plate 120 and the upper plate 140, and the chair body 100 and the fixing stud 200 with the fixing stud 200 installed. ) The chair bodies 100 that are not installed may be arranged in alternating rows. Let's look at this in more detail below.

Referring to FIG. 5, a screw hole is provided in the upper plate 140 of the chair body 100 of the liquid dome chair of the present invention through which the fixing stud 200 is positioned.

One end of the fixing stud 200 of the present invention may be inserted into a screw hole, and the other end may be extended in a horizontal direction with the upper plate 140. Specifically, the fixing stud 200 of the present invention is coupled through the upper plate 140, extends to form a predetermined circumference in the direction of the primary insulation wall 500, and has a pillar-shaped connecting rod 230 in the vertical direction. It may be provided in a structure in which an extension member 240 is coupled and is positioned in a horizontal direction with the upper plate 140.

First, the coupling member 210 of the fixing stud 200 of the present invention has a structure in which the fixing stud 200 is coupled through a screw hole formed in the upper plate 140 and the base plate 110 of the chair body 100. Depending on the implementation, it may be provided in a structure that is welded and not provided with a screw hole.

The support member 220 of the fixing stud 200 of the present invention may be provided in a structure formed to form a predetermined perimeter upward from the coupling member 210. Specifically, the support member 220 of the fixing stud 200 is located on the secondary barrier 600 and is provided in a structure that is welded and fixed to an additional corner box (not shown) located in the corner box 510, which will be described later. It forms a step with the connecting rod 230 and may serve to support the extension member 240.

The connecting rod 230 of the fixing stud 200 of the present invention extends upward from the support member 220 of the fixing stud 200 in the shape of a rod, and has a diameter larger than the support member 220 of the fixing stud 200. It can be formed in a small area.

The extension member 240 of the fixing stud 200 of the present invention may have a structure in which one side extends from one end of the connecting rod 230 of the fixing stud 200 in a horizontal direction with the upper plate 140 of the chair body 100. there is. Through this structure, a structure that can stably support the corner box 510 and the primary insulation wall 500 can be implemented.

Meanwhile, although the fixing stud 200 of the present invention has been described as having the above structure, it is fixed to the secondary barrier 600 to support the load and to stabilize the corner box 510 and the insulation box of the primary insulation wall 500. As long as it is a mechanical part that can be fixed, any shape or structure may be adopted.

Meanwhile, the chair body 100 in which the fixing stud 200 of the present invention is not installed performs the role of welding and fixing between the secondary insulation wall and the adjacent secondary insulation wall. Specifically, another secondary insulation wall adjacent to the secondary insulation wall of the present invention alternates between a chair body 100 with fixed studs 200 installed and a chair body 100 without fixed studs 200 installed. It consists of a structure located in between. In addition, the chair body 100 without the fixing studs 200 may be fixed by welding to the primary barrier located at the top and coupled to the secondary insulation wall located at the bottom.

In this way, according to an embodiment of the present invention, as the chair body 100 with the fixing stud 200 installed and the chair body 100 without the fixing stud 200 are positioned alternately, the fixing stud 200 Material costs can be reduced and a liquid dome chair with improved productivity can be implemented. In addition, the surrounding elements of the conventional liquid dome chair are implemented in a simple structure, making design and installation work easy, and the number of fixing studs 200 combined with the chair body 100 is significantly reduced, thereby reducing production costs. It will bring about a possible effect.

Meanwhile, according to one embodiment of the present invention, the chair body 100 with the fixing stud 200 installed and the chair body 100 without the fixing stud 200 can be arranged in a row through the connecting member 300. there is. The connecting member 300 of the liquid dome chair of the present invention may be located on the side, center, or front of the chair body 100 and have a structure in which the chair body 100 is arranged in a row, see FIGS. 6 to 8. Thus, the present invention will be described according to an embodiment in which the connecting member 300 is located. Meanwhile, in the embodiments described below, the same or similar reference numbers are assigned to the same or similar components as the previous example, and the description is replaced with the first description.

As shown in Figure 6, the connecting member 300 of the present invention can be positioned by welding on the side of the upper plate 140 of the chair body 100, which is provided in at least one piece, and the chair body 100 It can be arranged to align in a row.

Specifically, the connecting member 300 according to an embodiment of the present invention is welded and fixed to the side of the upper plate 140 of the chair body 100 and is attached to the side of the chair body 100 where the fixing stud 200 is not provided. It can be provided in a structure that is welded and fixed.

The connecting member 300 according to an embodiment of the present invention is provided in the form of a straight bar, and includes a chair body 100 without a fixing stud 200 installed and a chair body with a fixing stud 200 installed ( A structure in which 100) are arranged in a row and connected is implemented.

As shown in FIG. 7, the connecting member 300 of the present invention is centrally welded and fixed to the upper plate 140 of the chair body 100, which is provided in at least one piece depending on the implementation, thereby maintaining the chair body 100. It can be arranged so that they can be arranged in a row.

In this way, by connecting the chair body 100 in series with a simple structure, design and installation work is easy, and the number of fixing studs 200 combined with the chair body 100 is significantly reduced, thereby reducing manufacturing costs. A liquid dome chair can now be implemented.

Meanwhile, as shown in FIG. 8 of the present invention, according to another embodiment of the present invention, the connecting member 300 is formed in a shape that completely surrounds the outer surface of the chair body 100 arranged in a row, and the fixing stud 200 ) may have a penetrating structure. Specifically, the connecting member 300 of the present invention is formed to surround the outer surface of the side wall plate 130 and the upper plate 140 of the chair body 100 and another side wall plate 130 opposing the side wall plate 130. The upper plate 140 may be provided with a structure in which the fixing stud 200 penetrates. As such, according to another embodiment of the present invention, the connecting member 300 can stably fix the chair body 100, thereby improving structural stability.

In addition to the previously described embodiments, the present invention encompasses all embodiments resulting from a combination of at least two or more of the above embodiments or a combination of at least one or more of the above embodiments with known techniques.

Although the present invention has been described in detail through specific examples, this is for the purpose of specifically explaining the present invention, and the present invention is not limited thereto, and can be understood by those skilled in the art within the technical spirit of the present invention. It would be clear that modifications and improvements are possible.

All simple modifications or changes of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be made clear by the appended claims.

10: Liquefied gas storage tank 100: Chair body
110: base plate 120: support plate
130: side wall plate 140: top plate
200: fixing stud 210: coupling member
220: support member 230: connecting rod
240: extension member 300: connection member
400: primary barrier 500: primary insulation wall
510: corner box 600: secondary barrier
700: Secondary insulation wall

Claims (7)

At least one chair body arranged at regular intervals in the bow direction of the liquid dome to support the load of the membrane,
A fixing stud connected to the chair body and fixed to the membrane sheet,
It includes a connecting member connecting at least one chair body in a row,
A liquid dome chair, characterized in that the chair body on which the fixing studs are installed and the chair body on which the fixing studs are not installed are alternately positioned. According to paragraph 1,
The chair body is,
base plate,
Side wall plates coupled to both sides of the base plate,
A support plate coupled to the base plate and coupled to the inner surface of the side wall plate,
an upper plate coupled to the upper part of the base plate, and
Liquid dome chair, characterized in that the fixing stud is located through the upper plate and the base plate. According to paragraph 1,
A liquid dome chair, characterized in that the connecting member is coupled to the side of at least one chair body and connects the chair bodies to each other. According to paragraph 1,
A liquid dome chair, characterized in that the connecting member is coupled to the center of at least one chair body and connects the chair bodies to each other. According to paragraph 1,
The connecting member is formed in a shape that completely surrounds the outer surface of the chair body arranged in a row, and the fixing stud is positioned through the liquid dome chair. According to paragraph 1,
A ship comprising the liquid dome chair according to any one of claims 1 to 5. According to clause 6,
A ship including a liquid dome chair, characterized in that the cargo loaded on the ship is LNG.

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