KR101185800B1 - Insulation structure of independence type liquified gas tank and forming method thereof - Google Patents

Abstract

PURPOSE: An insulation structure for an independent liquefied gas tank and a forming method thereof are provided such that insulation tape can be easily attached and heat transfer from the outside of a storage tank is reduced. CONSTITUTION: An insulation structure for an independent liquefied gas tank comprises multiple insulation panels(15,35), upper plates(19), and insulation tape(30). The insulation panels are arranged on the outside of a tank body of an independent liquefied gas tank to form an insulation structure. The upper plates are included in the insulation panels. The insulation tape connects one upper plate on one insulation panel to another upper plate on another insulation panel. The insulation tapes are flatly attached between the upper plates.

Description

INSULATION STRUCTURE OF INDEPENDENCE TYPE LIQUIFIED GAS TANK AND FORMING METHOD THEREOF}

The present invention relates to a heat insulating structure of a standalone liquefied gas tank installed to store liquefied gas such as LNG or LPG, and a method of forming the same, and more particularly, to flatly install a heat insulating tape attached over adjacent heat insulating panels. The present invention relates to an insulating structure of a standalone liquefied gas tank and a method of forming the same.

Natural gas is transported in a gaseous state through onshore or offshore gas piping, or transported to a distant consumer while being stored in an LNG carrier in the form of liquefied liquefied natural gas (LNG) or liquefied petroleum gas (LPG). Liquefied natural gas is obtained by cooling natural gas at cryogenic temperatures (approximately -163 ° C), and its volume is reduced to approximately 1/600 of that of natural gas, making it well suited for long-distance transport through the sea.

LNG transports for loading LNG on land with the LNG loaded on land, or LNG RV (Regasification for loading LNG on natural gas) Vessel includes a cryogenic storage tank (often referred to as a 'hold') of liquefied natural gas.

These storage tanks can be classified into independent type and membrane type depending on whether the load directly affects the insulation material.Membrane type storage tanks are usually GT NO 96 type and TGZ Mark III type. Independent storage tanks are divided into MOSS type and SPB type. The structure of the MOSS type independent storage tank is described in Korean Patent No. 10-15063 and the like, and the structure of the SPB type independent storage tank is described in Korean Patent No. 10-305513 and the like.

In general, stand-alone storage tanks are made by attaching a relatively rigid insulation panel such as polyurethane to a tank body made of aluminum alloy, SUS, and 9% nickel-resistant alloy, and arranged on the inner bottom of the hull. Is placed on the support.

Insulation structure of a stand-alone storage tank for installing a plurality of insulation panels made of polyurethane foam on the outside of the tank body is described in Korean Patent No. 10-166608.

According to the heat insulation structure of the independent liquefied gas tank according to the prior art, heat insulation panels having a substantially hexahedral shape are successively attached to the outside of the tank body to prevent heat from being transferred to the liquefied gas contained in the tank. Insulation panels are manufactured to have a predetermined calculated thickness to block heat transfer.

In addition, the heat insulating material having elasticity even at low temperatures between the heat insulating panels arranged on the outside of the tank body to properly act according to the shrinkage of the tank body due to accommodating cryogenic liquefied gas to prevent the occurrence of stress in the heat insulating panel. Is installed.

According to the prior art, in order to attach one insulation panel to the outside of the tank body, first attaching a mounting member such as a stud to the outside of the tank body by welding, and then joining the cylindrical member and the supporting member to the mounting member, Subsequently, the insulation panel was fitted to the support member to perform the work of fastening with the washer and the nut. Here, the support member is a rod-shaped rod with threads formed at both ends, and the cylindrical member is a part interposed between the mounting member and the heat insulation panel to protect the heat insulation panel.

In general, when arranging a large thermal insulation panel in the tank body than the case of arranging a small thermal insulation panel in the tank body, less mounting members such as studs can be installed, so from the outside to the tank body through the mounting member It is easy to block the heat transferred. Furthermore, it is preferable to reduce the number of parts for attaching the insulation panel and to shorten the working time.

However, in the heat insulation structure of the liquefied gas storage tank according to the prior art, since the heat insulation panel must have a predetermined thickness as described above, the size of one heat insulation panel in consideration of workability when installing the heat insulation panel and the like. There is a limit that cannot be increased more than.

Therefore, it is possible to attach a larger insulation panel to the tank body, at the same time can further reduce the time and effort required for the attachment work, and to reduce the heat transfer from the outside of the storage tank as much as possible, the liquefied gas storage tank There is a continuing need for research on the thermal insulation of ethanol.

In addition, as shown in FIG. 1, according to the related art, the insulation panel 110 and another insulation panel 110 are spaced apart from each other at regular intervals. A stepped portion 111 is formed at the edge of the heat insulation panel 110, and a room temperature side gap B farther from the tank body is formed wider than the low temperature side gap A close to the tank body.

The low temperature side gap A is filled with a heat insulating material 113 such as glass wool having elasticity at low temperature, and the high temperature elasticity is higher than the heat insulation panel at a temperature close to room temperature in the normal temperature side gap B. The branch is filled with a heat insulating material 114 such as polyethylene foam or the like. In addition, the insulating tape 115 is attached to block the interface between the low temperature side gap and the normal temperature side gap.

According to the conventional insulation panel connection structure configured as described above, when liquefied gas leaks from the tank body 101, the liquefied gas leaked by the insulation tape 115 is prevented from falling through the insulation panel to the bottom of the hull. Can be. In addition, heat transfer to the outside may be excluded by the insulating materials filled in the low temperature side gap and the room temperature side gap.

However, in the related art, since the tank body contracts or expands depending on whether liquefied gas is accommodated in the storage tank, the distance between one insulation panel and another insulation panel has to be changed. In consideration of the change in spacing, as shown in an enlarged view in FIG. 1, the insulating tape 115 should be attached to form a rounded portion 115a upward or downward.

Therefore, the operator must attach the insulation tape 115 in a narrow space between the room temperature side gaps B, but must perform a hard taping operation that requires the attachment of the rounded portion 115a. There was a problem that the work took too much time.

Therefore, research on the insulation structure of the liquefied gas storage tank that can further reduce the time and effort required to attach the insulation panel to the tank body, and also reduce the heat transfer from the outside of the storage tank as possible. It needs to be done.

The present invention for solving the above problems, the independent liquefied gas tank is adjacent to the tank body by adjoining the plate member made of a material having the same or less thermal strain than the tank body on top of the insulation panel adjacent to the tank body It is an object of the present invention to provide a thermal insulation structure and a method of forming the independent liquefied gas tank that can be flatly installed thermal insulation tape attached over the insulation panels.

According to the present invention for achieving the above object, a plurality of insulation panels arranged outside the tank body of the independent liquefied gas tank for storing the liquefied gas to form a thermal insulation structure; An upper plate included in each of the plurality of insulating panels; An insulating tape connecting the upper plate included in one of the plurality of insulating panels to the upper plate included in another insulating panel; In the thermal insulation structure of the independent liquefied gas tank comprising a, when the tank body and the upper plate is thermally deformed according to the acceptance of the liquefied gas, the interval between the upper plates on the insulating panels are installed in succession The top plate is made of a material having a heat deformation amount equal to or less than that of the tank body so as not to be wider than the gap between the top plates before heat deformation, and the insulating tape is interposed between the top plates. An insulating structure of a standalone liquefied gas tank is provided, which is attached flatly in one layer.

The insulation panel preferably includes a primary insulation panel laminated on the outside of the tank body and a secondary insulation panel laminated on the outside of the primary insulation panel.

The top plate is preferably laminated on the primary insulation panel.

It is preferable that the heat insulating material is attached to the side surface of the said heat insulation panel.

In addition, according to another aspect of the present invention, a method for forming a heat insulating structure of a standalone liquefied gas tank for storing liquefied gas, comprising the steps of: installing a plurality of heat insulating panels outside the tank body of the standalone liquefied gas tank; Attaching a thermal insulation tape to connect adjacent thermal insulation panels to each other among a plurality of thermal insulation panels; In the method of forming a thermal insulation structure of the independent liquefied gas tank comprising a, the insulating tape is attached to the top plate included in the insulating panel flat in one layer, the tank body and the upper depending on the acceptance of the liquefied gas When the plate is thermally deformed, the top plate is arranged in rows of the tank body so that the spacing between the top plates on the successive thermally insulating panels is not wider than the spacing between the top plates before heat deformation. Provided is a method for forming an insulated structure of an independent liquefied gas tank, which is made of a material having a heat deformation amount equal to or less than the deformation amount.

The installing of the insulation panel may include stacking a primary insulation panel on the outside of the tank body and stacking a secondary insulation panel on the outside of the primary insulation panel.

Preferably, the insulating tape is attached after laminating the primary insulating panel and before laminating the secondary insulating panel.

According to the present invention as described above, in the independent liquefied gas tank of the independent liquefied gas tank in which a plate member made of a material having the same or less heat deformation than the tank body is laminated on the upper side of the insulation panel adjacent to the tank body. An insulating structure and a method of forming the same may be provided.

Accordingly, according to the insulating structure of the independent liquefied gas tank of the present invention and a method of forming the same, the insulating tape attached to the adjacent insulating panels can be flatly constructed, so that the operation of attaching the insulating tape can be easily performed. do.

In addition, according to the insulating structure of the independent liquefied gas tank of the present invention and a method of forming the same, the independent liquefied gas tank can be formed in a double structure of the insulating panel attached to the outside of the tank body, it is attached to the outside of the tank body By increasing the size of a single insulation panel, it is possible to reduce the parts required for installation, to reduce the time and effort required for installation work, and to reduce heat transfer from the outside of the storage tank as much as possible.

In addition, according to the present invention, when attaching the heat insulation panel to the tank body, it is easy to be carried out for the connection between the heat insulation panel and another heat insulation panel can be provided with a connection structure excellent in elasticity and heat insulation effect during thermal deformation. have.

1 is a partial cross-sectional view showing a connection portion of the insulating structure of the independent liquefied gas tank according to the prior art,
2 is a cross-sectional view of the heat insulation structure according to the first embodiment of the present invention;
3 is a perspective view for explaining a coupling structure of the primary heat insulation panel of the heat insulation structure according to the first embodiment of the present invention;
4 is a side cross-sectional view of the primary heat insulation panel of the heat insulation structure according to the first embodiment of the present invention;
5 is a cross-sectional view of a state before coupling for explaining the coupling structure of the primary insulating panel of the insulating structure according to the first embodiment of the present invention;
6 is a cross-sectional view of a state after coupling for explaining the coupling structure of the primary insulation panel of the insulation structure according to the first embodiment of the present invention;
7 is a cross-sectional view illustrating a coupling structure of a secondary insulating panel of a heat insulating structure according to a first embodiment of the present invention;
8 is a cross-sectional view of the heat insulation structure according to the second embodiment of the present invention;
9 is a perspective view for explaining a coupling structure of the primary heat insulation panel of the heat insulation structure according to the second embodiment of the present invention;
10 is a side cross-sectional view of a primary heat insulation panel of a heat insulation structure according to a second embodiment of the present invention;
11 is a cross-sectional view of a state before coupling for explaining the coupling structure of the primary insulating panel of the insulating structure according to the second embodiment of the present invention;
12 is a cross-sectional view of a state after coupling for explaining a coupling structure of a primary insulating panel of a heat insulating structure according to a second embodiment of the present invention;
13 is a cross-sectional view illustrating a coupling structure of a secondary insulating panel of a heat insulating structure according to a second embodiment of the present invention; and
14 is a sectional view of principal parts of a heat insulation structure according to the third embodiment of the present invention.

Hereinafter, a heat insulating panel coupling structure of a standalone liquefied gas tank according to a preferred embodiment of the present invention will be described in detail with reference to the drawings.

2 to 7 are views for explaining the heat insulation structure according to the first preferred embodiment of the present invention.

As shown in FIG. 2, the heat insulation structure of the independent liquefied gas tank is formed by attaching heat insulation panels 15 and 35 made of a relatively hard heat insulation material such as polyurethane foam to the outside of the tank body 11 to form a heat insulation layer. It is done by The heat insulation panels 15 and 35 may have a substantially hexahedral shape, and a plurality of heat insulation panels 15 and 35 are successively installed on the tank body 11 of the storage tank to form a heat insulation layer.

According to the present invention, the heat insulation panel, the primary heat insulation panel 15 disposed to be adjacent to the outside of the tank body 11, and the secondary heat insulation panel (laminated on the outer surface of the primary heat insulation panel 15 ( 35). In the present specification, the expression 'outer', 'outer' and 'upper' means the outward direction of the standalone liquefied gas tank, and the expression 'inner' and 'lower' means the inner direction of the tank in which the liquefied gas is stored. It is.

The tank body 11 and the heat insulating panel 15 are not completely in contact with each other and spaced apart from each other so that a gap is formed by the pad 13. The gap between the tank body 11 and the heat insulation panel 15 is used as a passage for the leakage liquid when the leakage of cargo occurs due to damage of the tank body 11.

According to the heat insulation structure which concerns on 1st Embodiment of this invention, the stud bolt 12 is provided in the outer surface of the tank body 11 at regular intervals. The stud bolt 12 may be fixedly mounted to the outside of the tank body 11 by welding.

The primary insulation panel 15 may be made by molding a polyurethane foam to a predetermined thickness, and may be made so that the upper plate 19 having a plate shape is attached to an upper surface of the polyurethane foam of a predetermined thickness.

Around the stud bolt 12, a pad 13 having a plate shape of a constant thickness may be disposed in close contact with the stud bolt 12. Since the pad 13 is installed around the stud bolt 12, the size of the gap between the tank body 11 and the primary insulation panel 15 can be kept constant.

The primary insulating panel 15 may be provided with an accommodating member 17 into which the stud bolt 12 may be fitted. The accommodating member 17 is installed at an approximately central portion of the primary insulation panel 15, and a through hole 17a through which the stud bolt 12 penetrates is formed in the accommodating member 17. It is preferable that the smallest portion of the through hole 17a is formed larger than the outer diameter of the stud bolt 12.

The insertion member 20 may be fitted into the through hole of the accommodation member 17. An insertion hole 20a into which the stud bolt 12 is inserted is formed at the center of the insertion member 20, and the diameter of the insertion hole 20a is preferably equal to the outer diameter of the stud bolt 12. .

In the drawing, the insertion member 20 has a tapered shape that is narrower in diameter toward one side, that is, as viewed downward, and the through hole of the receiving member 17 has a shape corresponding to the outer shape of the insertion member 20. However, the insertion member 20 may have a shape other than that shown, such as a cylindrical shape, wherein the through hole has a shape corresponding to the insertion member.

The heat insulating material 16 is attached to two side surfaces adjacent to each other among four side surfaces of a primary heat insulation panel. When successively installing the primary insulation panel 15 on the tank body 11, if the insulation 16 is attached only to two sides of the primary insulation panel 15, the side with the insulation 16 is installed and The primary insulation panel 15 is disposed so that the side which is not installed may face. Therefore, when the primary insulation panel 15 and another primary insulation panel 15 are installed in succession, the primary insulation panel can be surrounded by the insulation 16.

On the other hand, the heat insulating material 16 may be attached to all four sides of the primary heat insulation panel. As such, when the heat insulating material 16 is attached to surround the four sides of the primary heat insulating panel, it is preferable to design the heat insulating material to have a thickness of half as compared to the embodiment in which the heat insulating material is attached only to the two side surfaces.

It is preferable that the primary heat insulation panel 15 is made of the material which is excellent in heat insulation performance, while having a certain strength, such as a polyurethane foam and a reinforced polyurethane foam. The primary insulation panel 15 may include an upper plate 19 laminated and attached to an upper surface of the insulation material such as the polyurethane foam described above.

As shown in FIGS. 3, 6, and 7, the insulating tape 30 is flatly attached in one layer on the top plates 19 of the adjacent primary insulating panels 15 so that the top plates 19 are attached to each other. Connect to each other. The insulating tape 30 may be attached by cryogenic sealant. The plurality of primary insulation panels 15 may be fixed to the surface of the storage tank by the insulation tape 30 to have a complete sealing structure.

The upper plate 19 may be made of a material capable of protecting the insulation panel 15, for example, a low temperature steel material such as aluminum or SUS, or a FRP material such as plywood or GMT or GRP. According to the invention, the upper plate 19 is preferably made to have a heat deformation amount equal to or less than that of the tank body 11 containing the liquefied gas. More preferably, the upper plate 19 is made to have a heat strain equal to or less than the heat strain of the tank body 11 containing the liquefied gas and at the same time as the heat strain of the plywood.

In the present specification, the expression "The thermal deformation of the upper plate of the primary insulation panel is equal to or smaller than the thermal deformation of the tank body", the thermal deformation of the upper plate of the primary insulation panel is perfect in number and the thermal deformation of the tank body. It does not mean that the same or small, but depending on the acceptance of the liquefied gas, when the tank body contracts or expands, the upper plate of the primary insulation panel shrinks or expands together, but between the upper plates on the primary insulation panels installed in succession Since the intervals of the gaps do not become wider, the insulation tape itself may not be damaged or attached due to the contraction and expansion of the tank body even if the insulation tape is flatly attached between the upper plates of the primary insulation panel as described below. It is meant that the thermal strain of the top plate of the primary insulation panel is substantially the same or similar to the thermal strain of the tank body.

That is, if the heat deformation amount of the top plate of the primary insulation panel is the same as the heat deformation amount of the tank body, the gap between the top plates can be maintained even after the heat deformation is made, which is attached flat to the first top plate The insulating tape can remain flat even after thermal deformation. In addition, if the heat deformation amount of the top plate of the primary insulation panel is less than the heat deformation amount of the tank body, the gap between the top plates becomes narrower than the initial state after the heat deformation is made, is attached flat to the first top plate The thermal insulation tape may be bent upwards or downwards after thermal deformation, thereby preventing damage to the insulation tape itself or damage to the attachment state.

For example, aluminum 5083-O or stainless steel 304 may be used as a material of the tank body. The thermal strain of Aluminum 5083-O is about 2.23 × 10 ^-5 1 / ℃, and that of Stainless Steel 304 is about 1.73 × 10 ^-5 1 / ℃.

As the material of the upper plate 19, a first GMT corresponding to Aluminum 5083-O, a second GMT corresponding to Aluminum 5083-O, GRP, plywood, or the like may be used. The thermal strain of the first GMT corresponding to Aluminum 5083-O is approximately 2.6 × 10 ⁻⁵ 1 / ° C., and the thermal strain of the second GMT corresponding to Aluminum 5083-O is approximately 1.5 × 10 ⁻⁵ 1 / ° C., The thermal strain of the GRP is approximately 3.0 × 10 ⁻⁵ 1 / ° C., and the thermal strain of the plywood is approximately 0.6 × 10 ⁻⁵ 1 / ° C.

According to the present invention, when the heat deformation amount of the tank body 11 is 1, the heat deformation amount of the upper plate 19 is preferably in the range of about 0.2 to about 1.8, preferably in the range of about 0.2 to about 1.4. More preferred. That is, the expression "the heat deformation of the top plate of the primary insulation panel is equal to or less than the heat deformation of the tank body" means that the heat deformation of the top plate is in the range of approximately 0.2 to 1.8 with respect to the heat deformation of the tank body. do.

If the relative ratio of the heat deformation amount of the top plate to the tank body exceeds 1.8, there is a possibility that the heat insulating tape attached to the top plate may be damaged during the heat deformation of the top plate due to the heat deformation of the tank body. The upper limit that the insulation tape can not be damaged can be up to almost twice the amount of heat deformation of the tank body. The reason for this is that the insulation is performed by the primary insulation panel 15 located between the tank body 11 and the upper plate 19. This is because the temperature of the upper plate 19 is kept higher than the temperature of the tank body 11.

In addition, if the relative ratio of the heat deformation amount of the top plate to the tank body is less than 0.2, the gap between the top plates is too narrow during thermal deformation of the tank body, and the top plates may be in contact with each other, which is not preferable. .

The secondary heat insulation panel 35 is laminated outside the primary heat insulation panel 15 and above the primary heat insulation panel 15 as shown in FIG. 2. The secondary insulation panel 35 has a substantially hexahedral shape similarly to the primary insulation panel 15, and in this embodiment, the thickness of the secondary insulation panel 35 is shown to be thicker than that of the primary insulation panel 15. This is only an example and the thickness of the secondary insulation panel 35 may be made thinner or the same as that of the primary insulation panel 15.

The secondary insulation panel 35 may be fixed to the primary insulation panel 15 by being fitted to and coupled to the stud bolt 12 described above. To this end, the secondary insulation panel 35 may have a substantially circular fixing hole 34 formed therein. The fixing plate 33 is positioned in a state where the fixing plate 33 is integrally fixed to the secondary insulating panel 35 on the lower portion of the fixing hole 34, that is, on one surface of the secondary insulating panel 35 (lower surface in FIG. 2). Can be. The fixing plate 33 is formed with an insertion hole 33a through which the stud bolt 12 can be inserted.

By fixing the fixing plate 33 to the stud bolt 12 by the nut 40, the secondary insulation panel 35 and the primary insulation panel 11 can be fixed together to the stud bolt 12.

After the fixing of the secondary insulation panel 35 by the nut 40 is completed, the filler 37 may be inserted into the fixing hole 34. When the filler 37 is fitted into the fixing hole 34, the filler 37 may form a horizontal plane with the surface of the secondary insulation panel 35 or may have a size that protrudes finely.

Like the primary heat insulating panel 15, the secondary heat insulating panel 35 is preferably made of a material having excellent heat insulating performance while having a certain strength such as polyurethane foam or reinforced polyurethane foam.

In addition, as in the primary insulation panel, the heat insulating material 36 is attached to two side surfaces adjacent to each other among the four side surfaces of the secondary insulation panel 35. When the secondary insulation panel 35 is continuously installed on the primary insulation panel 15, if the insulation 36 is attached only to two sides of the secondary insulation panel 35, the insulation 36 is installed. The secondary insulation panel 35 is disposed so that the side and the side that is not installed face each other. Accordingly, when the secondary insulation panel 35 and another secondary insulation panel 35 are installed in succession, the secondary insulation panel can be surrounded by the insulation 36.

On the other hand, as in the primary insulation panel, the heat insulating material 36 may be attached to all four sides of the secondary insulation panel. As such, when the heat insulating material 36 is attached to surround the four sides of the secondary heat insulating panel, it is preferable to design the heat insulating material to have a thickness of half as compared with the embodiment in which the heat insulating material is attached only to the two side surfaces.

The secondary insulation panel 35 may include a protective layer 39 laminated on an outer surface, that is, an upper surface as shown in FIG. 2. The protective layer 39 may be made of a low temperature steel material such as aluminum, aluminum alloy, SUS, plywood or FRP material.

When the secondary insulation panel 35 is laminated on the primary insulation panel 15, as shown in FIGS. 2 and 7, the insulation 16 attached to the primary insulation panel 15 and the secondary insulation The fixing holes 34 of the secondary heat insulation panel 35 are formed at positions deflected from the center so that the heat insulating materials 36 attached to the panel 35 can be alternately arranged. Since the heat insulating material 16 attached to the primary heat insulating panel 15 and the heat insulating material 36 attached to the secondary heat insulating panel 35 are alternately disposed, the heat loss through the heat insulating materials 16 and 36 can be minimized. do.

As described above, according to the present invention, there is provided an independent liquefied gas tank in which a heat insulation panel attached to the outside of the tank body is formed in a double structure of a primary heat insulation panel and a secondary heat insulation panel.

Accordingly, according to the present invention, since a single insulation panel attached to the outside of the tank body can be divided into a primary and a secondary insulation panel, respectively, the operation is possible even if the size of the insulation panel is increased, and the insulation panel is increased. As a result, it is possible to reduce the parts required for installation, to reduce the time and effort required for installation work, and to reduce heat transfer from the outside of the storage tank as much as possible.

In addition, by stacking the top plate on the primary insulation panel and connecting the respective top plates to each other by an insulating tape, the connected top plates can prevent the liquefied gas leaked in direct contact with the hull when the liquefied gas leaks It can be configured to serve as a sealing wall.

In addition, according to the present invention, since the upper plate is made of a material having the same or smaller thermal strain as the tank body, there is no change in the gap between the upper plate during thermal expansion and thermal contraction of the tank body, so that the insulating tape can be constructed flat. This can reduce the time and effort required for the attachment of the insulation tape and improve productivity.

In addition, according to the present invention, since the insulation structure includes the primary and secondary insulation panels, it is possible to arrange only the primary insulation panel first, and then to attach the insulation tape in a wide space without restriction of space.

Hereinafter, a method of forming the heat insulation structure according to the first embodiment configured as described above with reference to FIGS. 5 to 7 will be described.

According to the heat insulation structure which concerns on 1st Embodiment, the stud bolt 12 is provided in the exterior of the tank body 11, and the primary heat insulation panel 15 is moved to the perpendicular | vertical direction with respect to the tank body 11, and the stud is provided. Insert the bolt 12, and then continue to move the primary insulation panel 15 in a horizontal direction with respect to the tank body 11 to remove the insulation positioned between one primary insulation panel and another primary insulation panel. Will be compressed.

As in the prior art, the stud bolts 12 are installed in the tank body 11 at regular intervals, and each of the stud bolts 12 is fitted with one primary insulation panel 15. The pad 13 is fitted to the stud bolt 12 before the primary insulation panel 15 is fitted.

Since the through hole 17a of the receiving member 17 provided in the substantially center portion of the primary heat insulation panel 15 has an inner diameter larger than the diameter of the stud bolt 12, the stud bolt 12 as shown in FIG. In the state that the primary insulation panel 15 is only inserted into the insulation layer 16, the insulation 16 attached to the side surface of the primary insulation panel 15 may not be pressed (or may be slightly pressed). It is possible to position the primary insulation panel 15 without the need to force to compress the insulation (16).

Subsequently, the operator can press the insertion member 20 into the through hole 17a of the accommodation member 17 to position the primary heat insulation panel 15 with respect to the tank body 11. When the insertion member 20 is press-fitted while inserting the stud bolt 12 into the insertion hole 20a formed in the center of the insertion member 20 and moving the insertion member 20 along the stud bolt 12 downward, 1 As shown in FIG. 6, the vehicle insulation panel 15 is moved in a direction in which the insulation material 16 is compressed.

As the primary insulation panel 15 is in place, the thickness of the insulation 16 is reduced (a> b) from the thickness (a) shown in FIG. 5 to the thickness (b) shown in FIG. 6 and then to the storage tank. As the liquefied gas is supplied or discharged, the thickness of the heat insulating material 16 may change due to the contraction or expansion of the tank body 11.

At this time, if the through-hole and the insertion member 20 of the receiving member 17 has a tapered shape, it is preferable to insert the insertion member 20 more easily. However, the present invention is not limited only to the through hole of the receiving member 17 and the insertion member 20 having a tapered shape.

As the insert member 20 is fixed by fastening the nut to the stud bolt 12, the primary insulation panel 15 may be fixed to the stud bolt 12.

When the primary insulation panel 15 is in position, the insulation tape 30 is attached to connect the top plates 19 on the primary insulation panel 15 to each other. As described above, since the upper plate 19 has the same or smaller thermal strain as the tank body 11, even if the tank body is thermally expanded and contracted, the interval between the upper plates 19 is kept constant or narrowed. Accordingly, even when the insulation tape 30 is constructed flat, the insulation tape is not damaged when the heat deformation.

After the top plates 19 are connected to each other by the insulating tape 30, as shown in FIG. 7, the insulating structure according to the present invention is completed by stacking the secondary insulating panels 35.

8 to 13 show a heat insulation structure according to the second embodiment of the present invention. In the heat insulating structure of the second embodiment, instead of using the pad, the lower end of the receiving member 27 protrudes downward by the thickness of the pad, and the heat insulating material 26 attached to the primary heat insulating panel 15 is provided. The width of the upper portion is thicker than the remaining portion is different from the heat insulation structure according to the first embodiment in that it has a shape covering a part of the upper edge of the primary insulation panel 15. In the following description of the second embodiment, the same components as those in the first embodiment are assigned the same reference numerals.

As shown in FIG. 8, the heat insulation structure of the independent liquefied gas tank is formed by attaching heat insulation panels 15 and 35 made of a relatively hard heat insulation such as polyurethane foam to the outside of the tank body 11 to form a heat insulation layer. It is done by The heat insulation panels 15 and 35 may have a substantially hexahedral shape, and a plurality of heat insulation panels 15 and 35 are successively installed on the tank body 11 of the storage tank to form a heat insulation layer.

The heat insulation panel includes a primary heat insulation panel 15 disposed to be adjacent to the outside of the tank body 11, and a secondary heat insulation panel 35 stacked on the outer surface of the primary heat insulation panel 15. .

According to the second embodiment, as shown in FIGS. 10 to 13, the lower end of the receiving member 27 has a constant thickness so as to form a gap between the tank body 11 and the primary insulation panel 15. Projecting downward of the primary heat insulating panel 15 by a dimension corresponding to the thickness of the pad in the first embodiment.

According to the heat insulation structure which concerns on 2nd Embodiment of this invention, the stud bolt 12 is provided in the outer surface of the tank body 11 at regular intervals. The stud bolt 12 may be fixedly mounted to the outside of the tank body 11 by welding.

The primary insulation panel 15 may be made by molding a polyurethane foam to a predetermined thickness, and may be made so that the upper plate 19 having a plate shape is attached to an upper surface of the polyurethane foam of a predetermined thickness.

The primary insulation panel 15 may be provided with an accommodating member 27 into which the stud bolt 12 may be fitted. The accommodating member 27 is installed at an approximately center portion of the primary insulation panel 15, and a through hole 27a through which the stud bolt 12 penetrates is formed in the accommodating member 27. It is preferable that the smallest part of the diameter of the through hole 27a is formed larger than the outer diameter of the stud bolt 12.

The insertion member 20 may be fitted into the through hole of the accommodation member 27. An insertion hole 20a into which the stud bolt 12 is inserted is formed at an approximately central portion of the insertion member 20, and the diameter of the insertion hole 20a is formed to be equal to the outer diameter of the stud bolt 12. desirable.

The heat insulating material 26 is attached to two side surfaces adjacent to each other among the four side surfaces of a primary heat insulation panel. When the primary insulation panel 15 is installed successively on the tank body 11, if the insulation 26 is attached only to two sides of the insulation panel 15, the insulation 26 is not installed on the side. The primary insulation panel 15 is disposed so that the side faces each other. Accordingly, when one primary insulation panel 15 and another primary insulation panel 15 are installed in succession, the primary insulation panel can be surrounded by the insulation material 26.

On the other hand, the heat insulating material 26 may be attached to all four sides of the primary heat insulation panel. As such, when the heat insulating material 26 is attached to surround the four sides of the primary heat insulating panel, it is preferable to design the heat insulating material to have a thickness of half as compared with the embodiment in which the heat insulating material is attached only to the two side surfaces.

According to the second embodiment, the heat insulator 26 has a substantially L-shaped cross-sectional shape that is thicker at the upper portion than the remaining portion. Accordingly, the heat insulating material 26 of the second embodiment attached to the side surface of the primary heat insulation panel 15 covers the side surface of the primary heat insulation panel 15 and covers a part of the upper surface edge of the primary heat insulation panel 15. .

It is preferable that the primary heat insulation panel 15 is made of the material which is excellent in heat insulation performance, while having a certain strength, such as a polyurethane foam and a reinforced polyurethane foam. The primary insulation panel 15 may include an upper plate 19 laminated and attached to an upper surface of the insulation material such as the polyurethane foam described above. The upper plate 19 may be made of a material capable of protecting the primary insulation panel 15, for example, a low temperature steel material such as aluminum or SUS, or plywood or FRP material.

The upper plate 19 may have a protrusion 19a protruding from the side surface of the primary insulation panel in a lateral direction of the primary insulation panel, that is, in a direction parallel to the upper plate. This protrusion 19a preferably protrudes from the opposite side to which the heat insulator 26 is attached, as shown in FIG. When the insulation 26 is attached to surround the primary insulation panel 15 at four sides, the protrusion 19a may be formed to protrude from two adjacent sides of the four sides.

The protrusion 19a is positioned on the heat insulating material 16 of the adjacent primary heat insulating panel 15 when the primary heat insulating panel 15 is installed on the tank body 11 in succession. Can be compressed. Accordingly, even if a step occurs in the height of the primary heat insulation panel 15 due to the bending of the tank body 11, the heat insulation 26 is compressed and absorbs the height difference as much as the step so that the primary heat insulation panel 15 is arranged in succession. The upper surface can be formed almost horizontally.

Since the secondary heat insulation panel 35 in 2nd Embodiment is the same as that of the secondary heat insulation panel 35 of 1st Embodiment mentioned above, the same member number is attached | subjected to the same member and detailed description is abbreviate | omitted for convenience.

Hereinafter, the formation method of the heat insulation structure which concerns on 2nd Embodiment comprised as mentioned above with reference to FIGS. 11-13 is demonstrated.

According to the formation method of the heat insulation structure which concerns on 2nd Embodiment, the stud bolt 12 is provided in the exterior of the tank body 11, and the primary heat insulation panel 15 is perpendicular | vertical with respect to the tank body 11 in a direction. Shifted and inserted into the stud bolt 12, and then the primary insulation panel 15 is moved in a horizontal direction with respect to the tank body 11 and positioned between one primary insulation panel and another primary insulation panel. The heat insulating material is crimped.

As in the prior art, the stud bolts 12 are installed in the tank body 11 at regular intervals, and each of the stud bolts 12 is fitted with one primary insulation panel 15. Since the receiving member 27 installed in the primary insulation panel 15 protrudes from the bottom surface of the primary insulation panel 15 by a predetermined thickness, a separate pad is not necessary.

Since the through hole 27a of the receiving member 27 provided in the substantially center portion of the primary insulation panel 15 has an inner diameter larger than the diameter of the stud bolt 12, the stud bolt 12 as shown in FIG. In the state in which the primary insulation panel 15 is only inserted into the insulation layer, the insulation 26 attached to the side surface of the primary insulation panel 15 may not be compressed (or may be slightly pressed). It is possible to position the primary insulation panel 15 without the need to force to press the insulation 26.

Subsequently, the operator can press the insertion member 20 into the through-hole 27a of the accommodation member 27 to position the primary heat insulation panel 15 with respect to the tank body 11. After inserting the stud bolt 12 into the insertion hole 20a formed in the center of the insertion member 20 and moving the insertion member 20 along the stud bolt 12, the insertion member 20 is pressed in, As shown in FIG. 12, the primary insulation panel 15 moves in the pressing direction of the insulation material 26 to be in position.

As the primary insulation panel 15 is fitted to the stud bolt 12, the thickness of the insulation 26 is reduced (c> d) from the thickness (c) shown in FIG. 11 to the thickness (d) shown in FIG. 12. After that, as the liquefied gas is supplied or discharged to the storage tank, the thickness of the heat insulating material 26 may change due to the contraction or expansion of the tank body 11.

At this time, if the through-hole and the insertion member 20 of the receiving member 27 has a tapered shape, it is preferable to insert the insertion member 20 more easily. However, the present invention is not limited to the through-hole and the insertion member 20 of the receiving member 27 having a tapered shape, but may have other shapes such as a cylindrical shape as shown.

In the second embodiment, the joining procedure of the secondary heat insulating panel 35 is the same as in the above-described first embodiment, and the same member number is given to the same member, and detailed description thereof is omitted for convenience.

14 shows a heat insulation structure according to the third embodiment of the present invention. The heat insulating structure of the third embodiment is different from the heat insulating structures according to the above-described embodiments in that the heat insulating panels are not laminated in a double manner and include a heat insulating panel having a stepped portion at the edge as in the prior art. Also in the heat insulation structure of 3rd Embodiment, the heat insulation material is affixed to the side surface of a heat insulation panel, and after inserting a heat insulation panel to a stud bolt, pressurizing to one side, and compressing a heat insulation material, the structure which positions a heat insulation panel by an insertion member is carried out. The same applies to the first and second embodiments described above.

As shown in FIG. 14, according to the third embodiment, the heat insulation panel 50 and another heat insulation panel 50 are disposed to be spaced apart at regular intervals. The stepped part 51 is formed in the edge of the heat insulation panel 50, and the room temperature side gap farther from the tank body 11 is formed more widely than the low temperature side gap close to the tank body 11.

The low temperature side gap may be filled with a heat insulating material 52 such as glass wool having elasticity at low temperature, and the high temperature side gap may be filled with polyethylene foam having high elasticity than the heat insulating panel at a temperature close to room temperature. The heat insulating material 53 is filled. In addition, the insulating tape 30 is attached to block the interface between the low temperature side gap and the normal temperature side gap.

According to the present invention, an upper plate 59 of a material having a heat deformation amount equal to or less than that of the tank body 11 is stacked on the upper surface of the stepped portion 51 to which the insulating tape 30 is attached. The insulating tape 30 connects the top plates 59 of adjacent insulating panels 50 to each other.

The upper plate 59 may be made of, for example, a low temperature steel material such as aluminum or SUS, plywood, or FRP material, and in particular, a heat deformation amount equal to or smaller than that of the tank body 11 containing liquefied gas. It is desirable to be made to have.

As described above, according to the present invention, since the upper plate is made of a material having the same or smaller thermal strain as the tank body, the gap between the upper plate is kept constant or narrowed at the time of thermal expansion and thermal contraction of the tank body. Even if the tape is flat, the thermal insulation tape is not damaged during thermal deformation, and thus the thermal insulation tape can be flat, thereby reducing the time and effort required for attaching the thermal insulation tape and improving productivity.

As described above, according to the first and second embodiments of the present invention, the heat insulation panel attached to the outside of the tank body of the independent liquefied gas tank is formed in the double structure of the primary heat insulation panel and the secondary heat insulation panel, and the primary heat insulation An insulation structure of a standalone liquefied gas tank is provided in which the heat deformation of the top plate of the panel is made equal to or smaller than the heat deformation of the tank body.

According to the independent liquefied gas tank having a double insulation layer of the present invention, compared with the conventional independent liquefied gas tank in which the insulation panel is stacked in a single layer, even if the insulation panel is broken, there is a possibility that the liquefied gas, which is a cargo, may leak immediately. have. That is, in the independent liquefied gas tank of the present invention, since the heat insulation panels are stacked in duplicate, there is little possibility that the double heat insulation panels are damaged at the same time.

In addition, the single-layer structure of the insulation panel as in the prior art, when the insulation panels are connected to each other, because the airtight operation must be performed in a narrow step space, the operation is difficult and the inspection also had a difficult problem, the dual structure as the present invention is the primary insulation panel After installation, the airtight construction of the connection part can proceed in a large space, the working conditions are good, and inspection can be carried out easily.

Furthermore, according to the heat insulating structure according to the first to third embodiments of the present invention, the heat insulating tape can be flatly attached between the primary heat insulating panels, so that it is not necessary to spend time and effort to form a round part as in the prior art. The taping operation can be easily performed.

In addition, the dual structure of the present invention can more flexibly cope with the situation where the thickness or size adjustment of the heat insulation panel is required to improve the heat insulation performance.

In addition, the single-layer structure of the insulation panel as in the prior art should be re-installed until the airtight construction when replacing the insulation panel due to the external damage of the insulation panel to ensure the airtight, the dual structure of the present invention need to touch the connection structure installed in the primary insulation panel By replacing only the secondary insulation panel without repairing, it is possible to complete the replacement work of the damaged insulation panel, which makes maintenance easy.

Insulation structure of the standalone liquefied gas tank according to the present invention can be applied to any of the offshore structures used as floating stand-alone liquefied gas tank, as well as the stand-alone liquefied gas tank is floating in the sea where the flow occurs, again In other words, LNG FPSO (Floating, Production, Storage and Offloading) or LNG FSRU, including liquefied gas carriers carrying LNG, LPG, etc. It can be applied to both offshore plants such as Floating Storage and Regasification Unit.

As described above, the independent liquefied gas tank having a double insulation layer according to the present invention has been described with reference to the illustrated drawings, but the present invention is not limited to the embodiments and drawings described above, and is seen within the claims. Various modifications and variations can be made by those skilled in the art to which the invention pertains.

11: tank body 12: stud bolt
13: pad 15: primary insulation panel
16, 26: heat insulating material 17, 27: receiving member
17a, 27a: through hole 19: top plate
19a: projection 20: insertion member
20a: insertion hole 30: insulating tape
33: fixing plate 33a: insertion hole
34: fixing hole 35: secondary insulation panel
36: insulation 37: filler
39: protective layer 40: nut
50: insulation panel 51: stepped portion
52, 53: heat insulating material

Claims (7)

A plurality of insulation panels arranged outside the tank body of the independent liquefied gas tank for storing liquefied gas to form an insulation structure; An upper plate included in each of the plurality of insulating panels; An insulating tape connecting the upper plate included in one of the plurality of insulating panels to the upper plate included in another insulating panel; In the thermal insulation structure of the independent liquefied gas tank comprising:
When the tank body and the top plate are thermally deformed according to the acceptance of liquefied gas, the spacing between the top plates on the thermally insulated panels that are installed in succession is greater than the gap between the top plates before heat deformation. In order not to widen, the top plate is made of a material having a heat deflection amount equal to or less than that of the tank body,
The insulating tape is a heat insulating structure of a standalone liquefied gas tank, characterized in that attached to the top of the top plate flat. The method according to claim 1,
The heat insulation panel, the insulation structure of the independent liquefied gas tank, characterized in that it comprises a primary heat insulation panel laminated to the outside of the tank body, and a secondary heat insulation panel laminated to the outside of the primary heat insulation panel. The method according to claim 2,
The top plate is a heat insulating structure of the independent liquefied gas tank, characterized in that formed on the primary insulation panel laminated. The method according to claim 1,
Insulating structure of the independent liquefied gas tank, characterized in that the insulating material is attached to the side of the insulating panel. A method of forming an insulating structure of a standalone liquefied gas tank for storing liquefied gas, comprising the steps of: installing a plurality of heat insulating panels outside the tank body of the standalone liquefied gas tank; Attaching a thermal insulation tape to connect adjacent thermal insulation panels to each other among a plurality of thermal insulation panels; In the method of forming a heat insulating structure of a standalone liquefied gas tank comprising:
The insulating tape is attached to the top plate included in the insulating panel flat in one layer,
When the tank body and the top plate are thermally deformed according to the acceptance of liquefied gas, the spacing between the top plates on the thermally insulated panels that are installed in succession is greater than the gap between the top plates before heat deformation. In order not to widen, the upper plate is formed of a material having a heat deformation amount equal to or less than the heat deformation amount of the tank body, the method of forming a thermal insulation structure of the independent liquefied gas tank. The method according to claim 5,
The step of installing the insulation panel, the step of laminating the primary insulation panel on the outside of the tank body, the independent liquefaction comprising the step of laminating a secondary insulation panel on the outside of the primary insulation panel Method of forming an insulating structure of a gas tank. The method of claim 6,
The insulating tape is a method of forming an insulating structure of the independent liquefied gas tank, characterized in that attached to the laminated before the secondary insulating panel after the laminated primary insulation panel.

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