KR20200085388A - Connection Bridge Structure between Insulating Panels of Liquefied Natural Gas Storage Tank - Google Patents

Abstract

The present invention provides a connecting bridge structure which connects insulating panels provided as components forming an insulating wall of a liquefied natural gas storage tank. The connecting bridge structure partially increases a thickness of a portion corresponding to a space between the insulating panels adjacent to each other in a connecting bridge, thereby reinforcing the connecting bridge at required strength without a change in a thickness of upper protecting panels placed on upper portion surfaces of the insulating panels.

Description

Connection Bridge Structure between Insulating Panels of Liquefied Natural Gas Storage Tank}

The present invention relates to a connection bridge structure between insulating panels of a liquefied natural gas storage tank, and more specifically, by an improved structure of a connecting bridge connecting between adjacent insulating panels, strength required without changing existing insulating panels. It relates to a bridge structure between the insulating panels of the liquefied natural gas storage tank that can meet the.

Natural gas is transported in gaseous form through on-shore or offshore gas piping, or transported to remote consumers while stored on LNG carriers in the form of liquefied natural gas (LNG). LNG is obtained by cooling natural gas to a very low temperature (approximately -163°C), and its volume is reduced to approximately 1/600 compared to natural gas in a gas state, so it is very suitable for long-distance transportation through sea.

A storage tank (commonly referred to as a'cargo') is installed in a structure for transporting or storing LNG, such as an LNG carrier for loading LNG and unloading LNG to land-based destinations by carrying LNG.

LNG storage tanks can be classified into an independent tank type and a membrane type according to whether a load of a cargo directly acts on an insulating material. Typically, the membrane type storage tank is divided into GTT's NO 96 type and MARK III type, and the independent tank type storage tank is divided into MOSS type and IHI-SPB type.

NO 96-type storage tanks include primary and secondary sealing walls made of 0.5 to 0.7 mm thick Invar (36% nickel steel) membrane, and insulating materials such as perlite powder in a plywood box. It includes primary and secondary insulating walls provided in the form of filled insulation boxes.

In the NO 96 storage tank, the primary sealing wall and the secondary sealing wall have almost the same degree of liquid tightness and strength, and in the event of leakage of the primary sealing wall, the secondary sealing wall can safely support the cargo even with the secondary sealing wall for a considerable period of time.

In addition, since the NO 96 type storage tank is a type of insulating wall filled with insulating material inside a wooden box, it can have higher compressive strength and stiffness than the MARK III type storage tank, and it is easy to weld and has a high automation rate.

The MARK Ⅲ storage tank has a primary sealing wall made of a 1.2 mm thick stainless steel (SUS) membrane, a secondary sealing wall made of a triplex, and a top or bottom surface of a polyurethane foam. It includes primary and secondary insulation walls that are made of insulation panels glued to wood plywood.

The primary sealing wall of the MARK Ⅲ type storage tank has a corrugated corrugated portion to absorb heat shrinkage by LNG in a cryogenic state, and since the corrugated corrugated portion absorbs the deformation of the membrane, there is no great stress in the membrane.

MARK type III storage tanks have disadvantages in terms of installation/manufacturing due to low welding automation rate of the primary sealing wall having corrugated corrugations, but they are cheaper than stainless steel membranes and triplexes, and are easy to construct, compared to Invar membranes. It is widely used because of its excellent thermal insulation effect.

As described above, typically, the insulating wall of the liquefied natural gas storage tank includes an insulating box or a sandwich type insulating panel filled with an insulating material therein as a component, and the components are adjacent to adjacent components for installation tolerances. It is provided with a predetermined gap between them.

At this time, in order to support the sealing wall stacked on the top of the insulating wall, there is a need to cover the upper surface of the gap formed between the components constituting the insulating wall. Particularly, in the MARK Ⅲ storage tank, the degree of heat shrinkage of the heat-insulating panels forming the heat-insulating wall is greater than that of the heat-insulating box.

1 is a view showing a bridge structure between the insulating panels of a conventional liquefied natural gas storage tank.

Referring to FIG. 1, in the conventional liquefied natural gas storage tank, a step is provided on the upper surface of the heat insulating panel 10, and the step portions of the heat insulating panels 10 adjacent to each other are connected to each other by a connection bridge 20. do.

However, in some cases, strength reinforcement of the connection bridge 20 is required to serve to support the load, and the thickness of the connection bridge 20 is the easiest way to reinforce the strength of the connection bridge 20. There is a way to increase it.

However, when the thickness of the connecting bridge 20 is increased for strength reinforcement, the depth of the step applied to the upper surface of the heat insulating panel 10 must be increased by the increased thickness of the connecting bridge 20. When the thickness of the top plywood 11 on the upper surface of the insulating panel 10 is smaller than the thickness of the reinforced connecting bridge 20, a situation in which the thickness of the top plywood 11 must also be increased also occurs. .

Since the thickness of the insulating panel 10 is constant, when the thickness of the top plywood 11 is increased, the space occupied by the insulating material 12 in the insulating panel 10 is reduced by that amount, which causes a loss of insulating performance. do.

Technical problem to be achieved by the present invention, in reinforcing the strength of the connecting bridge connecting between the insulating panels adjacent to each other, the insulating panel of the liquefied natural gas storage tank that can meet the required strength without changing the configuration of the existing insulating panel It is to provide an inter-connection bridge structure.

In order to achieve the above object, the present invention comprises an insulating material and an upper protective plate attached to the upper surface of the insulating material, provided in a plurality of insulating panels that constitute the insulating wall of the liquefied natural gas storage tank; And a connecting bridge connecting between the insulating panels adjacent to each other, wherein the connecting bridge is disposed to span between the insulating panels adjacent to each other, and both ends are formed at upper edges of the insulating panels adjacent to each other. Plate portions are respectively seated in the step portion; And a reinforcing part provided at a lower portion of the flat plate part to partially reinforce the strength of the connecting bridge, and the reinforcing part is provided to have a width corresponding to a space formed between the heat insulating panels adjacent to each other, and between the heat insulating panels. It provides a bridge structure between the insulating panels of the liquefied natural gas storage tank, characterized in that provided in the form of being inserted into the space.

The flat portion and the reinforcing portion may be made of plywood or fiber reinforced plastic material.

The reinforcing portion is provided as a separate member, and may be attached to the lower surface of the flat plate by an adhesive.

The reinforcing portion and the flat plate portion are provided as an integral single plate, and the reinforcing portion may be formed to protrude from the lower portion of the flat plate portion by processing.

The thickness of the reinforcing portion may be formed equal to or thicker than the thickness of the flat portion.

At least one end of the flat plate portion may be fixed to the step portion by a fastening member or an adhesive.

The fastening member may be a screw or a rivet.

In addition, in order to achieve the above object, the present invention includes a heat insulating material and an upper protective plate attached to the upper surface of the heat insulating material, and is provided in a number of liquefied natural gas comprising a heat insulating panel constituting the heat insulating wall of the liquefied natural gas storage tank In the storage tank, connecting the insulating panels adjacent to each other with a connecting bridge to support the membranes stacked on top of the space between the insulating panels adjacent to each other, wherein the connecting bridge, the end is at the upper edge of the insulating panel Liquefied natural gas, characterized by partially reinforcing the strength of the connection bridge by partially increasing the thickness of the connection bridge portion corresponding to the space between the heat insulating panels adjacent to each other and formed in the stepped portion to be formed. It provides a connection bridge structure between the insulating panels of the storage tank.

The connection bridge is made of plywood or fiber-reinforced plastic material, and partially increasing the thickness of the connection bridge increases the width corresponding to the space between the insulating panels adjacent to each other under the plywood in the form of a flat plate. The branches can be made by attaching another plywood plywood.

In the connection bridge, a portion having an increased thickness may be formed to have a thickness twice or more than that of other portions of the connection bridge.

The present invention provides a connection bridge structure between the insulation panels of the liquefied natural gas storage tank that can satisfy the required strength without changing the configuration of the existing insulation panels in reinforcing the strength of the connection bridges connecting between the insulation panels adjacent to each other. do.

When a partially reinforced connection bridge is applied according to the present invention, there is no need to change the thickness of the upper protection plate on the top surface of the heat insulation panel, so there is no loss of heat insulation performance, and also in terms of reinforcement effects, The effect can be realized more than increasing the overall thickness.

1 is a side cross-sectional view showing a bridge structure between the insulation panels of a conventional liquefied natural gas storage tank.
Figure 2 is a perspective view showing a bridge structure between the insulating panels of the liquefied natural gas storage tank according to the present invention.
Figure 3 is a cross-sectional side view showing a bridge structure between the insulating panels of the liquefied natural gas storage tank according to the present invention.
Figure 4 is a view comparing the stress acting on the connection between the insulation panels, (a) is a case where a conventional connection bridge is applied, (b) is a case of simply increasing the overall thickness of the conventional connection bridge, (c) ) Indicates a case where the connection bridge according to the present invention is applied.
5 is a view for comparing the degree of deformation of the connecting portion between the insulation panels, (a) is a case where a conventional connection bridge is applied, (b) is a case where the overall thickness of the conventional connection bridge is simply doubled, ( c) shows the case where the connection bridge according to the present invention is applied, respectively.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the contents described in the accompanying drawings, which illustrate preferred embodiments of the present invention.

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 denote the same members.

In the present invention, the use of the terms'primary' and'secondary' is based on the LNG stored in the storage tank to function primarily to seal or insulate LNG, or to function to secondarily seal or insulate. It was used as a criterion for determining whether or not.

In addition, by convention, the term'upper' or'up' applied to the elements of the tank refers to the direction toward the inside of the tank, regardless of the direction to gravity, and likewise, the term'lower' or'down' refers to gravity It refers to the direction toward the outside of the tank regardless of the direction.

2 is a perspective view showing a bridge structure between the insulating panels of the liquefied natural gas storage tank according to the present invention, and FIG. 3 is a side cross-sectional view showing a bridge structure between the insulating panels of the liquefied natural gas storage tank according to the present invention.

First, the connecting bridge structure between the insulation panels of the liquefied natural gas storage tank according to the present invention includes a secondary insulation wall disposed on the inner wall of the hull, a primary insulation wall disposed on the upper side thereof, and an upper portion of the secondary insulation wall and 1 It can be preferably applied to a liquefied natural gas storage tank having a dual barrier structure, including a secondary sealing wall and a primary sealing wall, which are respectively installed in close contact with an upper portion of the primary insulating wall.

In the present invention, the primary sealing wall and the secondary sealing wall are made of a metal membrane, and may be provided as a flat plate or a corrugated membrane.

Referring to Figures 2 and 3, the liquefied natural gas storage tank according to the present invention, as a component constituting the insulating wall supporting the membrane, the upper protective plate 111 is bonded to the upper surface of the insulating material 110 in the form of a sandwich The panel 100 may include a connection bridge 200 connecting the insulating panels 100 adjacent to each other.

The insulating material 110 of the insulating panel 100 may be made of polyurethane foam (PUF) or fiber-reinforced polyurethane foam (R-PUF) reinforced with glass fibers.

The upper protection plate 111 may be made of composite materials such as plywood or glass reinforced plastic (GRP).

As shown in the figure, the connecting bridges 200 are arranged to span between the adjacent insulating panels 100. To this end, a step portion in which an end portion of the connection bridge 200 is seated may be formed at an edge of the upper end portion of the insulation panel 100.

FIG. 3 shows only a part of the heat insulation panel 100, and only the configuration of the connection bridge 200 connecting between the heat insulation panels 100 adjacent in the x direction is shown, but adjacent to the y direction in the storage tank. It should be understood that the insulating panels can also be connected by a connecting bridge 200.

Accordingly, although a step is formed only on the upper both side edges of the upper protective plate 111 of the heat insulation panel 100, a step may be actually formed along the circumference of the upper protective plate 111.

The connection bridge 200 is attached to the lower portion of the flat plate portion 210 and the flat plate portion 210, which are seated at the step portions of the heat insulating panel 100, both ends of which are disposed on both sides, and the strength of the connection bridge 200 It includes a reinforcing portion 220 to partially reinforce.

The flat portion 210 and the reinforcing portion 220 may be formed of a composite material such as plywood or fiber-reinforced plastic in the same manner as the upper protective plate 111 of the insulating panel 100.

The top surface of the flat panel 210 seated on the step portion of the heat insulating panel 100 may be flush with the top surface of the heat insulating panel 100, that is, the top surface of the upper protection plate 111.

The reinforcing part 220 is provided as a separate member, and can be attached to the lower surface of the flat panel part 210 by an adhesive or the like, and is provided to have a width corresponding to a space between the heat insulating panels 100 adjacent to each other. It may be provided in a form to be inserted in.

On the other hand, the flat portion 210 and the reinforcing portion 220 may be provided as an integral single plate, in which case the reinforcing portion 220 may be configured to protrude to the lower portion of the flat portion 210 by processing. There will be.

The thickness of the reinforcing portion 220 may be formed to be equal to or thicker than the thickness of the flat plate portion 210. When the thicknesses of the reinforcing part 220 and the flat plate part 210 are formed to be the same, the connection bridge 200 is formed to have a thickness corresponding to twice that of the middle part to which the reinforcing part 220 is attached compared to other parts. Can be. However, the present invention is not limited to this, and the thickness of the reinforcing part 220 may be set according to the required reinforcing strength.

Reinforcing part 220, as shown in the drawing, may be provided to have the same cross-section continuously, when interference with a member installed in the space between the adjacent insulating panels 100, interference occurs In order to avoid, a limited discontinuous cross-section may be provided.

The connecting bridge 200 may be fixed by a fastening member such as a screw or rivet to a step formed on the upper edge of the heat insulating panel 100, or may be fixed by an adhesive.

At this time, both ends of the connection bridge 200 (specifically, both ends of the flat panel 210) may be fixed to both of the heat insulating panels 100, or only one end of either end may be fixed to the heat insulating panel 100. have.

As an example, when the insulating panel 100 of the present invention is provided as a component of the primary insulating wall, the primary insulating wall is exposed to a lower temperature than the secondary insulating wall, so that heat shrinkage occurs more, so the connection bridge ( 200) is preferably fixed at both ends to perform the role of controlling the heat shrinkage of the panel.

On the other hand, when the thermal insulation panel 100 of the present invention is provided as a component of the secondary thermal insulation wall, the secondary thermal insulation wall has relatively less heat shrinkage than the primary thermal insulation wall. It is sufficient that at least once is fixed.

The connection bridge structure between the insulation panels of the liquefied natural gas storage tank according to the present invention can be said to be a partial increase in the thickness of the middle portion of the connection bridge 200, rather than simply increasing the thickness of the connection bridge as in the prior art. .

According to the structure of the connection bridge 200 of the partially reinforcing type, it is not necessary to change the thickness of the upper protection plate 111 on the upper surface of the insulation panel 100, so that the insulation performance is not lost.

In addition, the connection bridge 200 according to the present invention can realize an effect beyond simply increasing the overall thickness of the connection bridge in terms of the reinforcing effect.

4 is a view for comparing the stress acting on the connection between the insulation panels, Figure 5 is a view for comparing the degree of deformation of the connection between the insulation panels. In Figures 4 and 5 (a) is applied to the conventional connection bridge, (b) is to increase the overall thickness of the conventional connection bridge simply doubled, (c) is to apply the connection bridge according to the invention Respectively. For reference, in (c), the connecting bridge according to the present invention is provided with twice the thickness of the intermediate portion reinforced by the reinforcing portion compared to other portions.

Referring to Figure 4, it can be seen that the stress acting on the connecting portion between the insulating panels is the lowest in the case of applying the connecting bridge according to the present invention (c), and referring to Figure 5, the degree of deformation of the connecting portion between the insulating panels In addition, it can be confirmed that the least is applied in the case of (c) to which the connection bridge according to the present invention is applied.

The present invention provides a connection bridge structure between the insulation panels of the liquefied natural gas storage tank that can satisfy the required strength without changing the configuration of the existing insulation panels in reinforcing the strength of the connection bridges connecting between the insulation panels adjacent to each other. do.

As described above, the heat insulating panel of the present invention can be applied to all of the primary insulating wall or the secondary insulating wall.

In addition, in the above-described embodiment, the present invention will be described as a preferred embodiment that the insulation material made of polyurethane foam (or fiber-reinforced polyurethane foam) and the plywood are applied to an insulation panel provided in a sandwich form. However, of course, the same may be applied to the insulation box provided in the form of filling the plywood box with the insulating material.

The present invention is not limited to the described embodiments, and it is obvious to those skilled in the art that various modifications and modifications can be made without departing from the spirit and scope of the present invention. Therefore, such modifications or variations will have to belong to the claims of the present invention.

100: insulation panel 110: insulation
111: upper protective plate
200: connecting bridge 210: flat plate
220: reinforcement

Claims (10)

An insulating panel including an insulating material and an upper protective plate attached to an upper surface of the insulating material, and provided in a number to constitute an insulating wall of the liquefied natural gas storage tank; And
And a connecting bridge connecting between the adjacent heat insulating panels,
The connection bridge,
A flat plate portion disposed to span between the heat insulating panels adjacent to each other, and seated at step portions formed at upper edges of the heat insulating panels adjacent to each other; And
It is provided on the lower portion of the flat plate portion includes a reinforcement portion for partially reinforcing the strength of the connection bridge,
The reinforcing portion is provided to have a width corresponding to a space formed between the heat insulating panels adjacent to each other, characterized in that provided in a form that is inserted into the space between the heat insulating panel,
Connection bridge structure between the insulation panels of the liquefied natural gas storage tank. The method according to claim 1,
The flat plate portion and the reinforcing portion, characterized in that provided in a plywood or fiber reinforced plastic material,
Connection bridge structure between the insulation panels of the liquefied natural gas storage tank. The method according to claim 2,
The reinforcing portion is provided as a separate member, characterized in that attached to the lower surface of the flat plate by an adhesive,
Connection bridge structure between the insulation panels of the liquefied natural gas storage tank. The method according to claim 2,
The reinforcing portion and the flat plate portion is provided as an integral single plate, characterized in that the reinforcing portion is formed to protrude from the lower portion of the flat plate portion by processing,
Connection bridge structure between the insulation panels of the liquefied natural gas storage tank. The method according to claim 2,
Characterized in that the thickness of the reinforcing portion is equal to or thicker than the thickness of the flat portion,
Connection bridge structure between the insulation panels of the liquefied natural gas storage tank. The method according to claim 2,
At least one end of the flat plate portion is fixed to the step portion by a fastening member or an adhesive,
Connection bridge structure between the insulation panels of the liquefied natural gas storage tank. The method according to claim 6,
The fastening member is characterized in that the screw (screw) or rivet (rivet),
Connection bridge structure between the insulation panels of the liquefied natural gas storage tank. In the liquefied natural gas storage tank including a heat insulating material and an upper panel to be attached to the upper surface of the heat insulating material, including a heat insulating panel constituting the insulating wall of the liquefied natural gas storage tank,
Connecting the insulation panels adjacent to each other by a connecting bridge, to support the membrane stacked on top of the space between the insulation panels adjacent to each other,
The connection bridge, the end is seated in the stepped portion formed on the upper edge of the insulation panel,
Characterized in that, by partially increasing the thickness of the connecting bridge portion corresponding to the space between the adjacent insulating panels, the strength of the connecting bridge is partially reinforced,
Connection bridge structure between the insulation panels of the liquefied natural gas storage tank. The method according to claim 8,
The connection bridge is made of plywood material,
Partially increasing the thickness of the connection bridge is made by attaching another plywood plywood having a width corresponding to a space between the heat insulating panels adjacent to each other at the bottom of the plywood in the form of a flat plate. doing,
Connection bridge structure between the insulation panels of the liquefied natural gas storage tank. The method according to claim 8 or claim 9,
In the connection bridge, the portion of which the thickness is increased is characterized in that it is formed to be twice or twice as thick as other portions of the connection bridge,
Connection bridge structure between insulating panels of liquefied natural gas storage tank

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