KR102553165B1 - testing apparatus for liquefied gas storage tank - Google Patents

Abstract

The present invention relates to an apparatus for testing a liquefied gas storage tank, which is an apparatus for testing a barrier applied to a dome in a liquefied gas storage tank having a storage space for accommodating liquefied gas, which forms an outer surface and has at least two open surfaces frame in the form of a square column; a support portion having a vertical portion extending downward from an upper surface of the frame and a bent portion bent toward one side open from the frame; and an upper end connected to the bent part of the support part, a lower end connected to the lower surface of the frame, and a sealing target part having an L-shaped cross section protruding toward the inner surface of the frame.

Description

Apparatus for testing liquefied gas storage tanks {testing apparatus for liquefied gas storage tank}

The present invention relates to an apparatus for testing a liquefied gas storage tank.

According to recent technology development, liquefied natural gas (LNG) and liquefied petroleum gas (LPG) have been widely used to replace gasoline or diesel.

LNG carriers that transport or store liquefied gas such as LNG at sea, LNG RV (Regasification Vessel), LNG FPSO (Floating, Production, Storage and Offloading), LNG FSRU (Floating Storage and Regasification Unit), etc. A liquefied gas storage tank (so-called "cargo hold") is installed to store in a cryogenic liquid state.

In the liquefied gas storage tank, Boil Off Gas (BOG) can be generated by heat intrusion from the outside, and through an adiabatic design, the Boil Off Rate (BOR), which is the vaporization rate of the boil-off gas, can be lowered. This is the core technology of liquefied gas storage tank design.

Therefore, such a liquefied gas storage tank may have at least two layers of insulation space, and an Interbarrier Space (IBS) and an Insulation Space (IS) are provided in an outward direction based on the space in which LNG is stored.

In addition, a dome is formed on the upper surface of the liquefied gas storage tank for loading/unloading of LNG. However, the dome can be applied with a structure to secure insulation performance by supplying nitrogen gas to the inside of the IBS while sealing the IBS and IS. In the efficient structure of the dome for sealing and insulation, continuous research and development have been made are losing

The present invention was created to solve the problems of the prior art as described above, and an object of the present invention is to provide a device for testing a liquefied gas storage tank having a structure capable of effectively testing the sealing of a barrier applied to a dome portion. it is for

An apparatus for testing a liquefied gas storage tank according to one aspect of the present invention is an apparatus for testing a barrier applied to a dome in a liquefied gas storage tank having a storage space for accommodating liquefied gas, forming an outer surface and having at least two surfaces Frame in the form of an open square pillar; a support portion having a vertical portion extending downward from an upper surface of the frame and a bent portion bent toward one side open from the frame; and an upper end connected to the bent part of the support part, a lower end connected to the lower surface of the frame, and a sealing target part having an L-shaped cross section protruding toward the inner surface of the frame.

Specifically, the sealing target part may have a shape in which an outer surface facing one open side of the frame is cut along a horizontal direction at a position of a portion protruding toward an inner surface of the frame.

Specifically, the support part and the sealing target part may be integrally made of metal.

Specifically, the sealing target portion may be formed to have a thinner thickness than the support portion.

Specifically, the sealing target portion may have a bent portion horizontally bent toward the inner surface of the frame so as to overlap the upper surface of the bent portion at an upper end.

Specifically, the sealing target portion has a protrusion that protrudes horizontally toward the inside of the frame, the outer end facing the one open side of the protrusion is open, and the inner end adjacent to the inner surface of the frame is sealed. It can form a letter C.

The apparatus for testing a liquefied gas storage tank according to the present invention is a specimen that can effectively verify the sealing performance of the barrier and the risk of leakage during the construction of the barrier applied to the dome. It can help you significantly improve.

1 is a partial cross-sectional view of a liquefied gas storage tank according to an embodiment of the present invention.
2 is a partially exploded perspective view of a liquefied gas storage tank according to an embodiment of the present invention.
3 is a partial perspective view of a liquefied gas storage tank according to an embodiment of the present invention.
4 and 5 are perspective views of an apparatus for testing a liquefied gas storage tank according to an embodiment of the present invention.

Objects, 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 adding reference numerals to components of each drawing in this specification, it should be noted that the same components have the same numbers as much as possible, even if they are displayed on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

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

For reference, the liquefied gas storage tank described below may be provided in a ship, and in this case, the ship may be a ship using at least liquefied gas as a propulsion fuel / power generation fuel, and a gas carrier, non-gas cargo or people. It is a concept that includes all transporting merchant ships, FSRUs, FPSOs, bunkering vessels, and offshore plants.

Hereinafter, a liquefied gas storage tank to which this embodiment is applied will be described with reference to FIGS. 1 to 3 first.

1 is a partial cross-sectional view of a liquefied gas storage tank according to an embodiment of the present invention, Figure 2 is a partially exploded perspective view of a liquefied gas storage tank according to an embodiment of the present invention, Figure 3 is an embodiment of the present invention It is a partial perspective view of the liquefied gas storage tank according to.

First, referring to FIGS. 1 and 2 , a liquefied gas storage tank 1 according to an embodiment of the present invention is mounted on a hull (not shown). At this time, the liquefied gas storage tank 1 may be a membrane type in which the bulkhead structure of the hull forms the outer wall 21 of the tank, or may be an independent type in which the liquefied gas storage tank 1 is drawn in and installed in the inner space of the hull.

The type of the liquefied gas storage tank 1 is not particularly limited, and the location where the liquefied gas storage tank 1 is mounted on the hull (inside a ship or outboard such as an upper deck) is also not limited. However, the liquefied gas storage tank 1 of the present invention may have a structure in which a heat insulating layer is disposed in an inward direction.

For reference, in this specification, the liquefied gas storage tank 1 will be described assuming that it is a membrane type in which an insulation layer is directly installed on the hull bulkhead. However, since the liquefied gas storage tank 1 may be provided as an independent type, it is noted that the expression hull below can be interpreted as replacing the external body of the liquefied gas storage tank 1.

The liquefied gas storage tank 1 has a storage space. Liquefied gas may be stored in the storage space, and the liquefied gas may be LNG. Hereinafter, it will be assumed that the liquefied gas is LNG, but in the present invention, the liquefied gas is forced to be liquefied for storage because its boiling point is lower than room temperature, in addition to LNG, and covers all substances (LPG, ethane, hydrogen, ammonia, etc.) with calorific value. can do.

The storage space of the liquefied gas storage tank 1 may form a closed space surrounded by the wall 10. However, an opening (not shown) is provided on the upper surface of the wall 10 for the inflow and outflow of liquefied gas, and a dome 20 is installed in the opening. That is, the liquefied gas storage tank 1 may include a wall 10 and a dome 20.

The wall 10 forms a storage space for accommodating liquefied gas and also forms an adiabatic space. Specifically, the wall 10 has a primary barrier 11, a primary insulation wall 12, a secondary barrier 13, and a secondary insulation wall 14 from the inside to the outside. For reference, in this specification, the inside means a direction toward the inside of the space where the liquefied gas is stored, and the outside means the opposite direction.

The primary barrier 11 forms a storage space for accommodating liquefied gas. The primary barrier 11 may be made of a metal material to suppress brittle fracture due to low-temperature liquefied gas, and is composed of, for example, SUS, INVAR, or the like.

In addition, a wrinkled or concave-convex structure may be formed on the primary barrier 11 to prepare for sloshing. As these primary barriers 11 are overlapped with each other and sealed by welding, the entire storage space (except for the dome 20) is made into a closed space.

The primary barrier 11 has a function as a barrier to prevent leakage of liquefied gas. In addition, since the secondary barrier 13 to be described later also serves as a barrier to prevent leakage of liquefied gas, the liquefied gas storage tank 1 of the present invention has a structure that implements leakage prevention in at least two layers.

The primary insulation wall 12 is disposed outside the primary barrier 11 and implements a primary insulation function. The primary insulating wall 12 may have a laminated form of plywood 121 and insulating block 122 . The plywood 121 is provided on the inside of the primary insulating wall 12, and an anchoring unit (not shown) is fixed to the plywood 121. The anchoring unit is a configuration provided for overlap welding of the primary barrier 11 and may be made of the same/similar metal material as the primary barrier 11.

The insulating block 122 is provided on the outer side of the primary insulating wall 12 and has insulating properties. The insulating block 122 may be made of a polyurethane foam block or a box block containing an insulating material. The insulation block 122 may be bonded and fixed to the secondary barrier 13 to be described later through bonding or the like, or may be fixed to the hull or the like by bolting.

The primary thermal insulation wall 12 is disposed in the closed space between the primary barrier 11 and the secondary barrier 13, the space in which the primary thermal insulation wall 12 is disposed can form a thermal insulation space, the primary The heat insulating space in which the heat insulating wall 12 is disposed may be referred to as an Interbarrier Space (IBS).

The primary heat insulating wall 12 provided at the highest position may be located below the upper wall 22 of the dome coaming 20a to be described later. This is because the connection barrier 24 must be constructed for sealing between the upper wall 22 of the dome coaming 20a and the secondary barrier 13.

That is, according to the construction sequence, the secondary barrier 13 is provided on the secondary insulation wall 14 and the primary insulation wall 12 is provided on the secondary barrier 13, the uppermost primary insulation wall ( 12) is located below the upper wall 22 and exposes a part of the secondary barrier 13. At this time, as the connection barrier 24 is installed between the exposed secondary barrier 13 and the upper wall 22, the dome coaming 20a and the secondary barrier 13 are sealed and connected to each other.

Thereafter, the gap between the uppermost primary insulating wall 12 and the upper wall 22 of the dome coaming 20a may be filled with the finished insulating wall 12a to cover the connection barrier 24 . The finish insulating wall 12a may have a structure including a plywood (not shown) and a heat insulating block (not shown) identically / similarly to the primary insulating wall 12 .

The inner surface of the primary insulating wall 12 and the finished insulating wall 12a may be provided side by side with each other, and the primary barrier 11 on the inner surface of the primary insulating wall 12 and the inner surface of the finished insulating wall 12a. ) can be installed.

The secondary barrier 13 is provided outside the primary thermal insulation wall 12 . The secondary barrier 13 has a sealing function to prevent leakage of liquefied gas together with the primary barrier 11, and the secondary barrier 13 prevents leakage of liquefied gas when the primary barrier 11 is damaged. will prevent

The secondary barrier 13 may be made of the same/similar metal material as the primary barrier 11, or may be made of a material different from that of the primary barrier 11. For example, the secondary barrier 13 may be formed of a composite sheet in which glass fiber sheets are laminated on both sides of a metal sheet, or a composite sheet in which metal sheets are laminated on both sides of a glass fiber sheet. Alternatively, the secondary barrier 13 may be made of a metal material such as SUS or INVAR.

The secondary barrier 13 may be laminated on the secondary insulation wall 14 . However, in order to seal the gap between the secondary insulation walls 14, a separate secondary barrier 13 is laminated. The secondary barrier 13 on the secondary insulation wall 14 is made of a relatively rigid material, , The secondary barrier 13 between the secondary insulation walls 14 may be provided with a relatively flexible material in preparation for contraction and expansion.

The secondary insulation wall 14 is disposed outside the secondary barrier 13 . The secondary insulation wall 14 has a thermal insulation function similar to the primary insulation wall 12, and has a structure in which plywood 141 and insulation block 142 are laminated in the same / similar to the primary insulation wall 12. It is done.

However, the stacking order of the plywood 141 and the insulating block 142 of the secondary insulating wall 14 may be opposite to that of the primary insulating wall 12 . The primary insulation wall 12 is provided with a plywood 121 provided with an anchoring unit for welding fixation of the primary barrier 11, while the secondary insulation wall 14 is fixed to the hull side. A plywood 141 may be provided on the outer surface.

The secondary insulation wall 14 may be fixed to the inner surface of the hull using bolts (not shown), and may also be fixed using mastic 143. Mastic 143 is an adhesive and fixes the plywood 141 of the secondary insulation wall 14 to the hull.

The secondary insulation wall 14 is disposed in a closed space between the secondary barrier 13 and the hull, and the space in which the secondary insulation wall 14 is disposed may be referred to as IS (Insulation Space) as a secondary insulation space. there is.

That is, the wall 10 goes from the inside to the outside in the order of the primary barrier 11 - IBS (primary insulation wall 12) - secondary barrier 13 - IS (second insulation wall 14) - hull It is provided to be laminated, and the insulation space, which is the IBS and the IS, is closed by a dome 20 to be described later.

In this way, the storage space of the liquefied gas storage tank 1 may be formed by the wall 10 having the double barrier and the double insulation wall (insulation space). The wall 10 includes a flat or curved surface or an inclined surface to form a storage space of various shapes.

The dome 20 is provided on the wall 10 forming the upper surface of the storage space. The wall 10 forming the storage space has an open top surface for the inflow and outflow of liquefied gas or boil-off gas, and the dome 20 is installed and finished at the open portion.

At this time, the wall 10 constituting the upper surface of the storage space may be provided to protrude upward at a certain height from the open portion to form a protrusion (not shown), and a dome 20 may be installed on the upper end of the protrusion.

The dome 20 closes the insulation space formed in the wall 10. As described above, the insulation space is provided on the inside and outside of the secondary barrier 13 in the wall 10, and the dome 20 may close each insulation space to be separated from each other.

The dome 20 includes a dome coaming 20a fixed to the wall 10 extending upward from the upper surface of the storage space. The dome coaming 20a is provided in the form of a hollow column and may have, for example, a square column shape.

The dome coaming 20a can make the IBS and IS separate from each other and form a closed space through a specific structure to be described later, and a nitrogen line (not shown) is provided to pass through the dome coaming 20a so as to penetrate the nitrogen in the insulation space. The inflow and outflow of can be implemented.

A dome cover (not shown) may be provided on the upper side of the dome coaming 20a. A line through which liquefied gas or boil-off gas can flow in and out may be disposed in the dome cover, and an upper end of a pump tower (not shown) is fixedly installed in the dome cover.

The dome 20 (or dome coaming 20a) includes an outer wall 21, an upper wall 22, a support 23, and a connection barrier 24.

The outer wall 21 has a certain height upward of the storage space. The outer wall 21 may be provided parallel to the outer surface of the protrusion and may be integrally fixed with the hull. It is also possible that a part of the hull is provided to replace the outer wall 21.

The outer wall 21 may be provided in a polygonal column shape, and lines may be provided to pass through each side. However, lines for supplying nitrogen to the insulation space/discharging nitrogen from the insulation space may be provided on opposite sides of the dome coaming 20a.

A horizontal reinforcing member 211 may be provided on the outside of the outer wall 21 . Depending on the height at which the outer wall 21 extends upward, the structural strength of the dome coaming 20a is secured by adding a reinforcing material 211 to the outer circumference of the outer wall 21 .

At this time, the reinforcing material 211 may be disposed between the trunk deck and the upper wall 22 of the hull. Of course, when the height of the outer wall 21 extending between the trunk deck and the upper wall 22 is not high, the reinforcing member 211 can be omitted, and the trunk deck can serve as the reinforcing member 211 .

The upper wall 22 is supported by the outer wall 21 and a dome cover is seated on at least a portion thereof. The upper wall 22 may be configured to be vertically fixed to the top of the outer wall 21, and may be provided horizontally and provided in parallel with the wall 10 forming the upper surface of the storage space.

The upper wall 22 may be provided in a form protruding outward from the outer wall 21, and a dome cover may be inserted into the inside. In addition, since the upper wall 22 has a width equal to or greater than the thickness of the wall 10, it is possible to cover the insulating spaces of the wall 10.

The outer end of the upper wall 22 is provided to protrude outward compared to the outer wall 21, and a vertical web member (not shown) is provided between the upper wall 22 and the reinforcing member 211 to increase structural strength. .

A primary barrier 11 may be connected to the inside of the upper wall 22 . To this end, a first step difference eliminating means 221 is provided at the inner end of the upper wall 22 . The first level difference eliminating means 221 may be a structure having a U-shape consisting of upper and lower surfaces and a vertical surface therebetween, and the upper surface may overlap and be fixed to the inner end of the upper wall 22 .

However, since the height of the first level difference eliminating means 221 may be greater than the thickness of the upper wall 22, the fixing end 222 is provided to firmly fix the first level difference eliminating means 221 to the inner end of the upper wall 22. can be used The fixing end 222 may extend downward from the inner end of the upper wall 22 so that both the upper and lower surfaces of the primary step difference eliminator 221 are fixed to the upper wall 22 .

The support 23 extends downward from the upper wall 22 outside and inside the outer wall 21 . When the support 23 covers the insulation spaces through the upper wall 22, it will be used to separate the inner insulation space IBS of the secondary barrier 13 and the outer insulation space IS of the secondary barrier 13. can

The support 23 is connected to the secondary barrier 13 through a connection barrier 24 to be described later, so that the outer insulation space of the secondary barrier 13 communicates with the outside of the support 23 and the secondary barrier 13 The inner heat insulation space of the is in communication with the inside of the support (23). However, since the upper end of the support 23 is fixed to the upper wall 22, the support 23 divides the insulation space in the inner and outer directions.

The support 23 may include a vertical portion 231 and a bent portion 233 . The vertical portion 231 is provided to extend downward from the lower surface of the upper wall 22 . At this time, the vertical portion 231 is provided parallel to the secondary barrier 13 on the outside compared to the secondary barrier 13 and is provided parallel to the outer wall 21 on the inside compared to the outer wall 21.

In order to secure a stable structure when the dome cover through which various lines pass is seated on the dome coaming 20a, the support 23 may extend downward from the upper wall 22 at a point outside the secondary barrier 13. At this time, in order to seal the insulation space outside the secondary barrier 13 by interconnecting the support 23 and the secondary barrier 13, in this embodiment, the support 23 may be provided with a bent portion 233.

The bent portion 233 is provided below the support 23 and is bent at right angles. The bent portion 233 extends to a point adjacent to the secondary barrier 13 after being bent, but the lower end of the bent portion 233 and the secondary insulation wall 14 are arranged to be spaced apart in the vertical direction, during installation Mutual interference can be prevented.

The connection barrier 24 may be fixed to the inner surface of the bent portion 233 and the inner heat insulating material 26 may be fixed. Conversely, an outer heat insulating material 25 is provided on the outer surface of the bent portion 233, which will be described later.

The lower end of the support 23 is spaced upward from the secondary insulation wall 14, and a gap may be formed between the bent portion 233 and the secondary insulation wall 14. At this time, at least a part of the secondary step difference eliminating unit 236 may be positioned in the gap.

The second step solving means 236 may have a U-shape similar to the first step solving means, and a fixing end 237 is provided at the bent part 233 to fix the second step solving means 236 It can be, and the lower surface of the secondary step difference eliminating means 236 can be fixed to the bent part 233 by the fixing end 237.

In addition, the upper surface of the second step eliminating means 236 may be overlapped and fixed to the upper surface of the bent portion 233, and the inner surface of the second step eliminating means 236 may be provided in parallel with the second barrier 13 . That is, the secondary step difference eliminating unit 236 compensates for the discrepancy between the inner end of the bent portion 233 and the secondary barrier 13 in the inward and outward direction, thereby ensuring sealing performance by the connection barrier 24 .

The connection barrier 24 seals between the secondary barrier 13 and the support 23 to divide the insulation space inside and outside the secondary barrier 13 . The connection barrier 24 may be made of the same/similar material as the secondary barrier 13, but may be made of a material that is flexible compared to the secondary barrier 13 provided on the secondary insulation wall 14.

The connection barrier 24 may be made of a material capable of bending during installation. For example, the connection barrier 24 may be formed of a composite sheet in which glass fiber sheets are laminated on both sides of a metal sheet.

The connection barrier 24 may have a lower end fixed to the secondary barrier 13 and an upper end bent outward relative to the lower end and fixed to the bent portion 233 . For example, the worker may fix the lower end of the connection barrier 24 to the secondary barrier 13 first, then fold the upper end outward and attach it to the bent portion 233 by bonding or the like.

The lower end of the connection barrier 24 is located above the height of the primary insulation wall 12, so that the primary insulation wall 12 can be fixed to the secondary barrier 13 before construction of the connection barrier 24. . Of course, as described above, the connection barrier 24 constructed above the primary insulation wall 12 may be finished by constructing the finishing insulation wall 12a.

The upper end of the connection barrier 24 is fixed to the secondary step difference eliminator 236 to seal between the secondary barrier 13 and the support 23 . In particular, the upper portion of the connection barrier 24 is bent outwardly while surrounding the second level difference eliminating means 236 and is fixed to the upper surface of the second level difference eliminating means 236 .

In this case, the connection barrier 24 may be provided so as to come into contact with the inner surface of the secondary step difference solving means 236 but not be bonded to the inner surface of the second step difference eliminating means 236 . That is, the lower end of the connection barrier 24 is stacked and connected by abutting in a direction perpendicular to the secondary barrier 13, and the upper part is not bonded while abutting in a direction perpendicular to the inner surface of the secondary step difference eliminator 236. And, the upper side may be bonded and fixed while abutting in a horizontal direction to the upper surface of the secondary step difference eliminating means 236.

That is, the connection barrier 24 is bent or bent to correspond to the shape of the second step difference solving means 236 between the inner surface of the second step difference solving means 236 and the upper surface of the second step difference solving means 236. It can be done.

Therefore, the fixing direction of the lower end and the upper end of the connection barrier 24 may be different from each other, and in this case, the connection barrier 24 has a lower surface fixed to the secondary barrier 13 and a An upper surface fixed to the upper surface may be provided to form a right angle.

Like the secondary barrier 13, the connection barrier 24 is made of a composite sheet in which a non-metallic material such as a glass fiber sheet is mixed.

Of course, the connection barrier 24 can also be made of a metal material having a higher strength than the secondary barrier 13, and in this case, the connection barrier 24 has the shape of the secondary step elimination means 236 (particularly, the secondary step elimination means). (236) can be manufactured to have a shape corresponding to the curvature between the inner surface and the upper surface).

The inner surface of the secondary step difference eliminating means 236 is provided to support the connection barrier 24 while coming into contact with the connection barrier 24 . At this time, since the connection barrier 24 is made so as not to be bonded to the inner surface of the second step canceling means 236, the connection barrier 24 on the inner surface of the second step canceling means 236 and Can be contracted/expanded independently.

In addition, since the connection barrier 24 of this embodiment is fixed to the upper surface of the second step eliminating means 236, not the inner surface, the inner surface of the second step eliminating means 236 necessarily needs to be parallel to the second barrier 13. There is no

That is, the secondary step eliminating means 236 is for securing sealing performance by more smoothly fixing the connection barrier 24 compared to the bent portion 233, the inner surface of the second step eliminating means 236 is It may be provided relatively parallel to the primary barrier 13 or deflected inward or outward relative to the secondary barrier 13 to the extent that it does not significantly affect sealing.

At this time, the degree of significant influence on the sealing means that as the connection barrier 24 is bent or bent due to the step difference between the secondary barrier 13 and the inner surface of the secondary step difference eliminator 236, it has a significant effect on the structural strength. may mean a case of

The connection barrier 24 is made of a material capable of bending, even if the inner surface of the secondary step eliminating means 236 is slightly biased in the inward and outward direction compared to the secondary barrier 13, so that the secondary barrier 13 and the second step After being finely deflected inward or outward between the solving means 236, it may come into contact with the inner surface of the second step canceling means 236 and be fixed to the upper surface of the second step canceling means 236.

In this embodiment, it has been described that the lower end of the bent portion 233 of the support 23 and the secondary insulating wall 14 may be spaced apart, but the outer heat insulating material 25 may be provided in the spaced portion.

The space where the outer heat insulating material 25 is provided is an outer heat insulating space of the secondary barrier 13 and may be filled with a non-explosive gas such as nitrogen. For reference, the internal pressure may be set in the order of IS > storage space > IBS, but is not limited thereto.

The outer heat insulating material 25 is filled between the outer wall 21 and the support 23 . At least a part of the outer heat insulating material 25 may be provided parallel to the secondary heat insulating wall 14, and may implement a secondary heat insulating function together with the secondary heat insulating wall 14. However, the outer heat insulating material 25 may be made of the same/similar material or a different material from the secondary heat insulating wall 14, and for example, the outer heat insulating material 25 may be made of glass wool, reinforced polyurethane foam, or the like.

The outer heat insulating material 25 is filled in the space between the support 23 and the outer wall 21 and may have a height extending from the upper wall 22 to the lower end of the support 23 . That is, the lower end of the outer heat insulating material 25 may be positioned below the bent portion 233 to come into contact with the secondary heat insulating wall 14 .

The outer heat insulator 25 may be divided into at least two parts in consideration of construction efficiency and the like, may be integrated after construction, and may be partially made of different materials. For example, the outer portion of the support 23 of the outer insulator 25 may be made of glass wool or the like, and the lower portion of the support 23 of the outer insulator 25 may be made of polyurethane foam or the like.

The inner heat insulating material 26 is fixed to the inside of the vertical portion 231 and has an inner surface parallel to the inner surface of the secondary barrier 13 or the connection barrier 24 . The inner heat insulating material 26 compensates for the fact that the vertical portion 231 of the support 23 is biased outward compared to the secondary barrier 13, and may be provided to secure a flat surface for installation of the finished heat insulating wall 12a. .

The inner heat insulating material 26 may be made of a material in which wood is overlapped in multiple layers, and may be fixed to the vertical portion 231 with mastic 261 as described for the secondary heat insulating wall 14 . Mastic 261 may be applied to the vertical portion 231 .

In addition, in order to firmly fix the position of the inner insulator 26, a stud 2311 may be provided in the vertical portion 231 in an inward direction, and the inner insulator 26 penetrates the stud 2311 and attaches to the stud 2311. A fixed fixture 262 (such as a nut) may be used.

The inner heat insulator 26 may also be applied between the primary level difference eliminator 221 and the vertical portion 231 of the support 23 . The inner heat insulating material 26 may be provided in various ways to make the lower part of the upper wall 22 and the inner part of the support 23 into a square shape in order to install the finished insulating wall 12a, and may be partially made of different materials. can For example, the inner insulator 26 fixed to the vertical portion 231 and the bent portion 233 of the support 23 is made of wood material to secure fixing force, and the inner insulator 26 fixed to the lower surface of the upper wall 22 ) may be provided with a polyurethane material for an insulating effect.

Hereinafter, the connection barrier 24 at the corner of the dome 20 will be described with reference to FIG. 3 .

Referring to FIG. 3 , the support 23 may have an inner surface facing the storage space and an upper surface that is bent from the inner surface and extends outward. The connection barrier 24 provided at the corner of the dome 20 is a corner barrier. As (27), it may include a corner main barrier 271, a corner finishing barrier 273, and the like.

Specifically, the corner step difference eliminating means (not shown) provided on the support 23 at the corner of the dome 20 may be different from the previously described secondary step difference eliminating means 236 . The corner step difference eliminating unit may have an inner surface that faces the storage space but is convex outward, and upper and lower surfaces that are bent from the inner surface and extend outward and have a relatively L-shape.

At this time, the corner barrier 27 may be finished by stacking the corner main barrier 271 on the corner step difference eliminating means and then stacking the corner finishing barrier 273 . The corner main barrier 271 is provided to cover the inner surface of the support 23 (in the description of the corner barrier 27 in this specification, the support 23 can be interpreted as a corner step eliminating means). In addition, the corner main barrier 271 may be bent or bent to have an L-shaped cross section, similar to the connection barrier 24 described above, to cover a portion of the upper surface of the support 23 .

The corner finishing barrier 273 may overlap the corner main barrier 271 to form a seal. These corner finishing barriers 273 may be provided to cover all parts of the support 23 where there is a risk that the corner main barriers 271 may be lifted.

At the corner of the dome 20, between the support 23 and the secondary barrier 13 is mainly sealed by the corner main barrier 271, and the corner finishing barrier 273 is made of a three-dimensional curved surface that is somewhat difficult to manufacture, Sealing of liquefied gas can be fully realized.

For reference, a corner auxiliary barrier (not shown) having an appropriate shape is additionally applied between the corner main barrier 271 and the corner finishing barrier 273 to prepare the shape of the corner main barrier 271 in a form that is easy to manufacture. let me know you can do it

Hereinafter, with reference to FIGS. 4 and 5, an apparatus 30 for testing a liquefied gas storage tank that can be utilized in manufacturing the liquefied gas storage tank 1 will be described.

4 and 5 are perspective views of an apparatus 30 for testing a liquefied gas storage tank according to an embodiment of the present invention. 4 shows the device 30 for testing the liquefied gas storage tank in a state before the construction of the connection barrier 24, and FIG. 5 shows the state in which the connection barrier 24 is installed on the device 30 for testing the liquefied gas storage tank. indicate

4 and 5, the apparatus 30 for testing a liquefied gas storage tank according to an embodiment of the present invention has a shape corresponding to a corner portion of the dome 20 and is connected to the dome 20. It can be used to test the sealing performance of barriers 24 (particularly corner barriers 27, hereinafter connection barriers 24 may be interpreted as corner barriers 27).

This liquefied gas storage tank test apparatus 30 includes a frame 31, a support part 32, and a sealing target part 33, and each component can be integrally manufactured while being made of metal such as SUS. there is.

The frame 31 has a rectangular pillar shape forming an outer surface. At this time, the outer surface of the frame 31 may be utilized as a surface corresponding to the outer wall 21 of the hull where the liquefied gas storage tank 1 is installed.

The frame 31 may have a rectangular pillar shape with at least two sides open, and thus has a bottom surface, a top surface, and two adjacent side surfaces. At this time, it is provided so that the degree of adhesion of the connection barrier 24 can be visually checked through the open portion.

The support portion 32 is provided to extend downward from the upper surface of the frame 31 . The support unit 32 may have a configuration corresponding to the support 23 of the liquefied gas storage tank 1 described above. This support portion 32 includes a vertical portion 321 and a bent portion 322. The vertical portion 321 vertically extends downward from the upper surface of the frame 31, and at this time, the vertical portion 321 may be provided to have an L-shaped flat cross section to represent a corner structure.

The bent portion 322 is bent toward one side opened in the frame 31 . The bent portion 322 may be provided similarly to the bent portion 233 of the support 23 above. For reference, hereinafter, facing the open side of the frame 31 means the front with reference to FIG. 4, and pointing to the inner surface of the frame 31 may mean the rear with reference to FIG. 4. .

The bent portion 322 extends from the lower end of the vertical portion 321 toward one open side of the frame 31, and is provided to have a L-shaped flat cross section corresponding to the vertical portion 321. Therefore, the vertical portion 321 and the bent portion 322 may be provided in a form claiming the support 23 in the corner structure.

The portion to be sealed 33 is provided under the support portion 32 and is a portion to be tested whether or not it is sealed by the connection barrier 24 . The sealing target portion 33 has an upper end connected to the bent portion 322 of the support portion 32 and a lower end connected to the lower surface of the frame 31 .

In addition, the sealing target portion 33 has a U-shaped cross section protruding toward the inner surface of the frame 31 from the central portion, and the protruding portion at this time may be defined as the protruding portion 331 . The protrusion 331 is provided in the form of claiming a gap between the secondary barrier 13 and the support 23 (particularly, the corner step eliminating means) in the liquefied gas storage tank 1.

To this end, the protruding portion 331 protrudes horizontally toward the inside of the frame 31, and has an open outer end facing the open side of the frame 31. Therefore, since the upper and lower surfaces of the outer surface of the sealing target portion 33 are spaced apart by the open portion of the protrusion 331, a shape corresponding to the gap between the secondary barrier 13 and the support 23 is provided. .

The inner end of the protrusion 331 adjacent to the inner surface of the frame 31 may be sealed, and as a result, the protrusion 331 may form a U shape. The inner end of the protrusion 331 may also have an open form similar to the outer end, but in this case, since the sealing target portion 33 is divided into two parts, which may be inconvenient to manufacture, the protrusion 331 of this embodiment has an inner end. It can be made into a closed form.

That is, the sealing target portion 33 has a shape in which the outer surface facing the open side of the frame 31 is cut along the horizontal direction at the position of the portion protruding toward the inner surface of the frame 31 .

Due to this protrusion 331, the upper portion of the sealing target portion 33 becomes a portion corresponding to the corner step difference eliminating means, and the lower portion of the sealing target portion 33 is the secondary stacked on the secondary insulation wall 14. It becomes a configuration corresponding to the barrier 13. In addition, the outer end of the protruding portion 331 forms an object to be sealed as a gap between the secondary barrier 13 and the corner step difference eliminating means.

Therefore, in this embodiment, when the connection barrier 24 is constructed to cover the outer end of the protrusion 331 in the sealing target portion 33 as shown in FIG. can be easily checked.

As mentioned above, the sealing target portion 33 may be integrally manufactured with the support portion 32 and metal. In the case of the liquefied gas storage tank 1, the secondary insulation wall 14 is laminated on the outside of the secondary barrier 13, and the secondary barrier 13 is mixed with a non-metallic material, Although the barriers 13 and the like are made of different materials, the device 30 for testing the liquefied gas storage tank of this embodiment is for testing leaks during construction of the connection barrier 24 and for testing the insulation performance. Since it is not, there is no problem at all in the test even if the entire portion to be sealed 33 is made of metal such as SUS.

However, the sealing target portion 33 may be formed to have a thickness thinner than that of the support portion 32, so that a test may be performed in consideration of a difference in thickness between the secondary barrier 13 and the support 23.

An empty space can be formed between the portion to be sealed 33 and the inner surface of the frame 31 . In addition, since the space between the vertical portion 321 of the support portion 32 and the inner surface of the frame 31 may also be empty, the present embodiment does not need to apply the secondary insulation wall 14 or the outer insulation 25. does not exist.

Therefore, since the apparatus 30 for testing the liquefied gas storage tank of the present embodiment is manufactured only with metal without applying a heat insulating material, it has the advantage of being very easy to manufacture and also very simple to manage.

The portion to be sealed 33 has a bent portion 332 overlapping the upper surface of the bent portion 322 at an upper end. The bent portion 332 is provided at an upper end of the sealing target portion 33 and may refer to a portion that is horizontally bent toward the inner surface of the frame 31 .

The bent part 332 is provided to represent the upper surface of the corner step difference eliminating means, and the part where the bent part 332 and the bent part 322 come into contact and are integrated can be made larger than the thickness of the bent part 322 there is. Moreover, the part where the bent part 332 and the bent part 322 come into contact is the thickest part among the support part 32 and the part to be sealed 33 .

The bent portion 332 and the bent portion 322 may be mutually fixed by welding or the like. For example, the bent portion 332 may be superimposed on the bent portion 322 and coupled through overlapping welding. Alternatively, when the sealing target portion 33 and the entire support portion 32 are integrally formed, the bent portion 332 and the bent portion 322 are not separated from each other and can be made integrally so that a clear dividing point cannot be confirmed. there is.

In this way, this embodiment is used to test the connection barrier 24 for the corner structure of the dome 20 appearing in the liquefied gas storage tank 1, and the shape is made only with metal such as SUS without a structure such as an insulating wall. This makes it very easy to manufacture and manage.

Regarding this embodiment, after the connection barrier 24 is constructed, sound test, vacuum test, etc. can be conveniently and conveniently performed, thereby further increasing reliability during the manufacture of the liquefied gas storage tank 1. .

Although the present invention has been described in detail through specific examples, this is for explaining the present invention in detail, the present invention is not limited thereto, and within the technical spirit of the present invention, by those skilled in the art It will be clear that the modification or improvement is possible.

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

1: liquefied gas storage tank 10: wall
11: primary barrier 12: primary insulation barrier
121: plywood 122: insulation block
12a: finishing insulation wall 13: secondary barrier
14: secondary insulation wall 141: plywood
142: insulation block 143: mastic
20: dome 20a: dome coaming
21: outer wall 211: stiffener
22: upper wall 221: 1st step relieving means
222: fixed end 23: support
231: vertical part 2311: stud
233: bending part 236: 2nd step eliminating means
237: fixed end 24: connection barrier
25: outer insulator 26: inner insulator
261: mastic 262: fixture
27: corner barrier 271: corner main barrier
273: corner finishing barrier 30: device for testing
31: frame 32: support part
321: vertical portion 322: bent portion
33 Sealing target part 331 Protrusion part
332: bend

Claims (6)

As a device for testing a barrier applied to a dome in a liquefied gas storage tank having a storage space for accommodating liquefied gas,
A frame in the form of a quadrangular pillar that forms an outer surface and has at least two open surfaces;
a support portion having a vertical portion extending downward from an upper surface of the frame and a bent portion bent toward one side open from the frame; and
A test device for a liquefied gas storage tank comprising an upper end connected to the bent part of the support part and a lower end connected to the bottom surface of the frame and a sealing target part having a cross section in the shape of a letter X protruding toward the inner surface of the frame. The method of claim 1, wherein the sealing target portion,
A test device for a liquefied gas storage tank having a shape in which an outer surface toward one open side of the frame is cut along the horizontal direction at a position of a portion protruding toward the inner surface of the frame. The method of claim 1, wherein the support part and the sealing target part,
A test device for a liquefied gas storage tank that is integrally manufactured by metal. The method of claim 1, wherein the sealing target portion,
Formed to have a thickness thinner than the support portion, a test device for a liquefied gas storage tank. The method of claim 1, wherein the sealing target portion,
A test device for a liquefied gas storage tank having a bent part bent horizontally toward the inner surface of the frame so as to overlap the upper surface of the bent part at the top. The method of claim 1, wherein the sealing target portion,
Has a protrusion that protrudes horizontally toward the inside of the frame,
The protrusion, the outer end facing the open side of the frame is open, the inner end adjacent to the inner surface of the frame is closed to form a U shape, a test device for a liquefied gas storage tank.

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