JP4043469B2 - Insulation method for cryogenic material storage tank - Google Patents

Description

The present invention fixes a plurality of heat insulation panels to the surface of a tank for storing a cryogenic substance , fills joints between joints between adjacent heat insulation panels, and installs moisture-proof tape on the outer surface side of the joint material. Further, the present invention relates to a heat insulation construction method for a cryogenic material storage tank that adheres to the outer surface sides of the heat insulation panels on both sides of the joint material.

  The heat insulation construction method is used to insulate a tank mounted on a land tank or a carrier ship that stores cryogenic substances such as liquefied petroleum gas, liquefied natural gas, liquefied oxygen, liquefied nitrogen, and liquefied hydrogen, for example, In order to prevent deterioration of heat insulation performance due to penetration of water (water vapor) into the joint, moisture-proof tape is adhered across the outer surface side of the joint material and the outer surface sides of the heat insulation panels on both sides of the joint material. However, conventionally, as shown in FIG. 9, as a moisture-proof tape, a protective layer 16 in which a polyethylene terephthalate film having a thickness of about 50 μm is bonded with an adhesive layer 22 is provided on one side of a metal sheet 13 such as an aluminum alloy foil. A moisture-proof tape 19 having an adhesive layer 17 coated with a butyl rubber-based adhesive material or the like on the other side is used (see, for example, Patent Document 1).

Japanese Patent No. 2720322

For example, when a cryogenic substance is accommodated in the tank, the tank contracts and the heat insulation panel fixed to the tank surface is pulled toward the inside of the tank, and the joint material is compressed by the heat insulation panel. Compressive force along the surface direction also acts on the moisture-proof tape that adheres to the outer surface side of the joint material and the outer surface side of the heat insulation panel on both sides, but the moisture-proof tape that has been used conventionally is elastically deformed Since it is difficult to follow, the compression displacement cannot be followed, and a shearing force is generated in the adhesive portion between the moistureproof tape and the heat insulating panel.
Also, if the tank surface is curved, such as a spherical tank, the moisture-proof tape is forced to deform along the curved shape and adheres to the joint surface and heat insulation panel surface. The moisture-proof tape tries to return to its original shape, and in this case, a tensile force is generated in the adhesive portion between the moisture-proof tape and the heat insulation panel.
The combined force of shearing force and tensile force generated in these moisture-proof tapes is the peeling force of the moisture-proof tape, and the moisture-proof tape that easily generates shearing force and tensile force becomes a tape that is easy to peel off.
The moisture-proof tape cannot withstand the peeling force as time passes, easily peels off from the edge portion, etc., and has a drawback that water (water vapor) enters the joint from the peeled portion and the heat insulation performance is likely to deteriorate.
In particular, in the case of a tank mounted on a transport ship, it is necessary to enter the dock about once every two years for inspection, etc., so the tank temperature changes between extremely low and normal temperatures each time. Further, the moisture-proof tape is repeatedly stretched and deformed frequently, so that the moisture-proof tape is more easily peeled off.
This invention is made | formed in view of the said situation, Comprising: It aims at providing the heat insulation construction method which heat insulation performance does not fall easily.

The first characterizing feature of the present invention, by fixing the plurality of insulation panels to the surface of the tank for storing the cryogenic material, the joint material is filled into joints of each other adjacent insulation panels, a moisture-proof tape, wherein A heat insulating construction method for a cryogenic substance storage tank that adheres to the outer surface side of a joint material and the outer surface sides of the heat insulating panels on both sides of the joint material, and the reinforcement formed in the form of a mesh with a metal sheet as the moisture-proof tape The sheet is laminated so that the metal sheet enters the mesh of the reinforcing sheet, and an adhesive layer is provided on the metal sheet side to integrate the adhesive layer with the joint material. It exists in the point made to adhere over the outer surface side and the outer surface side of the heat insulation panel of the both sides of the joint material.

[Action and effect]
As a moisture-proof tape, a metal sheet and a reinforcing sheet formed in a mesh shape are laminated so that the metal sheet enters the mesh of the reinforcing sheet, and a moisture-proof tape that is integrated by providing an adhesive layer on the metal sheet side is used. Since the adhesive layer is adhered to the outer surface side of the joint material and the outer surface sides of the heat insulating panels on both sides of the joint material, the moisture-proof tape is hardly peeled off due to the so-called corrugation effect, and the heat insulation performance is not easily lowered.
In other words, as illustrated in FIG. 6A, the metal sheet 13 and the reinforcing sheet 14 formed in a net shape are laminated so that the metal sheet 13 is dispersed and enters each mesh 15 of the reinforcing sheet 14. Since the tape 4 is used to adhere the joint material so as to completely cover the surface material of the heat insulation panel on both sides sandwiching the joint material, the heat insulation panels are close to each other with the joint material sandwiched between them. When compressive displacement is applied, as shown in FIG. 6 (b), the adhesive layer 17 and the metal sheet portion 13a entering each mesh 15 are pushed out to the outside of the mesh 15 to be corrugated bent. Deforms so that the angle θ becomes large and easily contracts so as to follow the proximity displacement between the heat insulation panels. Also, the heat insulation panels are pulled apart by sandwiching the joint material. When that give the displacement, as shown in FIG. 6 (c), modified as corrugated bending angle θ becomes smaller, and stretched so as to follow the spaced displacement of each other insulating panel easily.
Therefore, the moisture-proof tape itself can be used in a deformation that gives compressive displacement to the joint material when the heat insulating panels are close to each other, and also in a deformation that gives a tensile displacement to the joint material by separating the heat insulating panels. Because it expands and contracts due to the corrugation effect, it follows the displacement of the joint material. It becomes difficult to peel over, and it is hard to reduce heat insulation performance.

The 2nd characteristic structure of this invention exists in the point which uses the moisture-proof tape which comprises the said metal sheet with the aluminum alloy foil whose thickness prescribed | regulated by the alloy number 1N30 of JISH4160 is 15 micrometers-30 micrometers.

[Action and effect]
Since the moisture-proof tape which comprises the metal sheet with the aluminum alloy foil whose thickness prescribed | regulated by the alloy number 1N30 of JISH4160 is 15 micrometers-30 micrometers is used, moisture resistance can be maintained effectively, without impairing workability.
In other words, when a moisture-proof tape made of an aluminum alloy foil having a thickness of less than 15 μm as defined by the alloy number 1N30 of JISH4160 is used, there is a possibility that pinholes are formed in the aluminum alloy foil. The aluminum alloy foil is easily damaged and damaged by contact with other things at the time, and the reliability with respect to moisture resistance is lowered.
Further, moisture-proof tape of metal sheet thickness are composed of an aluminum alloy foil as defined in alloy No. 1N3 0 of JISH4160 exceeding 30μm, in such a manufacturing process of providing an adhesive layer on the metal sheet side, broken aluminum alloy foil The aluminum alloy foil is prone to cracking and the flexibility is impaired, so the use of such a moisture-proof tape reduces the reliability of the moisture-proof property and causes the tank surface to be curved like a spherical tank. In such a case, it becomes difficult to adhere along the surface of the joint portion or the surface of the heat insulating panel, and wrinkles that communicate with the inside of the joint portion at the edge portion of the moisture-proof tape are likely to occur.
Fear with respect to the, the metal sheet thickness to define an alloy number 1N30 of JISH4160 is because it uses moisture tapes are composed of an aluminum alloy foil 15Myuemu～30myuemu, which pinhole aluminum alloy foil has occurred Even in the manufacturing process where the adhesive layer is provided on the metal sheet side, the aluminum alloy foil is not easily broken or cracked in the aluminum alloy foil. Since it is hard to be damaged and it is easy to ensure the flexibility of the moisture-proof tape, even when the tank surface is curved, the edge part communicates with the inside of the joint part along the joint part surface and the heat insulation panel surface. It is easy to adhere so as not to cause wrinkles, and moisture resistance can be effectively maintained without impairing workability.

  The third characteristic configuration of the present invention is that a moisture-proof tape is used in which the adhesive layer is made of a butyl rubber adhesive material having a thickness of 400 μm to 1000 μm.

[Action and effect]
Since a moisture-proof tape having an adhesive layer made of a butyl rubber adhesive material having a thickness of 400 μm to 1000 μm is used on the side of an aluminum alloy foil having a thickness of 15 μm to 30 μm specified by alloy number 1N30 of JISH4160, an aluminum alloy While maintaining the structure where the foil penetrates the mesh of the reinforcing sheet, it is easy to adhere along the surface of the joint and the surface of the heat insulation panel, and the adhesive layer is made of a butyl rubber adhesive with a thickness exceeding 1000 μm. If the adhesive is adhered while being pressed with a roller or the like during construction, the adhesive may protrude from between the moisture-proof tape and the surface of the heat insulating panel, and the outer surface of the heat insulating panel may be soiled, but the adhesive layer has a thickness of 1000 μm. Since it is composed of the following butyl rubber adhesive, even if it is adhered while being pressed with a roller during construction, Les is small.
Furthermore, the butyl rubber-based pressure-sensitive adhesive material needs to be heated and melted to be provided as an pressure-sensitive adhesive layer on the aluminum alloy foil side, but when using a moisture-proof tape having a pressure-sensitive adhesive layer with a thickness exceeding 1000 μm, In manufacturing, it is necessary to use a heater with higher heating capacity than the heater normally used as a heater for melting the butyl rubber adhesive, and it cannot be manufactured with the conventional manufacturing line, so the manufacturing cost becomes high and the construction cost However, since the moisture-proof tape that can be manufactured even by a conventional manufacturing line provided with an adhesive layer having a thickness of 1000 μm or less is used, the construction cost can be reduced.
In addition, if a moisture-proof tape with an adhesive layer with a thickness of less than 400 μm is used with a butyl rubber-based adhesive material, the adhesive layer can follow the unevenness of the surface of the joint material after molding, and when the tank shrinks, the joint material The follow-up of the adhesive layer to the deformation of the surface and heat insulation panel is reduced and the moisture-proof tape is easy to peel off, but since the moisture-proof tape with an adhesive layer with a thickness of 400 μm or more is used with a butyl rubber adhesive material, molding The followability of the adhesive layer to the unevenness of the surface of the subsequent joint material and the followability of the adhesive layer to the deformation of the joint material surface and the heat insulating panel when the tank contracts can be secured, and the moisture-proof tape is difficult to peel off.

According to a fourth characteristic configuration of the present invention, the reinforcing sheet is split into a thermoplastic resin film along the stretching direction to produce a web, and the splitting direction intersects a plurality of webs. In other words , a moisture-proof tape made of a resin sheet formed in a net-like shape is used by being laminated and bonded to each other .

[Action and effect]
By dividing the metal sheet and the thermoplastic resin film along the stretching direction to produce a web, by laminating a plurality of webs so that the splitting direction intersects and fusing together, Since the metal sheet is laminated so that the metal sheet is dispersed and entered into each mesh of the resin sheet , and the moisture-proof tape that has the metal sheet dispersed and held is used, so-called a net-like resin sheet is used. The corrugation effect makes it easy to follow the expansion and contraction of the moisture-proof tape.
An aluminum alloy foil having a thickness of 15 to 30 μm and a resin sheet having a basis weight of 15 to 50 g / m ² and a thickness of 50 to 200 μm are arranged so that the aluminum alloy foil enters the mesh of the resin sheet. In the case of using a laminated moisture-proof tape, the aluminum alloy foil surely enters the mesh of the resin sheet , and can adhere in a state in which it easily follows expansion and contraction of the joint material.
Moreover, in order to make it easier to enter the aluminum alloy foil having a thickness of 15 μm to 30 μm into the mesh of the resin sheet , the mesh spacing is about 2 mm to 5 mm (basis weight: 15 to 50 g / m ² , thickness : A resin sheet of 50 μm to 200 μm) is desirable.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the parts indicated by the same reference numerals as those in the conventional example indicate the same or corresponding parts.

  FIG. 1 shows a steel spherical tank T for storing cryogenic substances such as liquefied petroleum gas, liquefied natural gas, liquefied oxygen, liquefied nitrogen, and liquefied hydrogen, which are mounted on a carrier ship, on the outer periphery in the horizontal direction. A plurality of substantially rectangular heat insulation panels A that are long along the tank are arranged and fixed to the tank outer surface 1 in a zigzag manner, and as shown in FIGS. The joint material 2 is filled in the joint portion 2 (2a, 2b), and the moisture-proof tape 4 (4a, 4b) extends over the outer surface side of the joint material 3 and the outer surface side of the heat insulating panel A on both sides of the joint material 3. Is adhered and fixed to the outer surface 1 of the tank.

  As shown in FIG. 5, the heat insulation panel A is for reinforcing a normal temperature side heat insulating material 5 made of polyurethane foam and a low temperature side heat insulating material 6 made of phenol foam, which are previously coated with a surface material 5 a at a factory or the like. It is composed of a composite panel integrated with a net 7 and is attached so that the low temperature side heat insulating material 6 side is in contact with the tank outer surface 1 side. It is formed in the truncated pyramid shape formed in the inclined surface which penetrates into the inner side toward the low temperature side heat insulating material 6 side over the circumference.

The heat insulation construction method according to the present invention in which the heat insulation coating is provided on the outer surface 1 of the spherical tank T using the heat insulation panel A will be described.
First, stud bolts 10 that are slightly longer than the thickness of the low-temperature side heat insulating material 6 are arranged along the horizontal direction at predetermined intervals and fixed to the outer surface 1 of the tank by welding or the like. The low temperature side heat insulating materials 6 are brought into close contact with each other so that there is no gap between them, and the low temperature side heat insulating materials 6 of the heat insulating panels A adjacent in the vertical direction are brought into close contact with each other with a stud bolt 10 interposed therebetween. The washer 11 is fitted into the projecting portion between the low temperature side heat insulating materials 6 so as to straddle the upper and lower low temperature side heat insulating materials 6, and the nuts 12 are screwed to fix the heat insulating panels A to the tank surface 1.

  Next, a joint portion between the room temperature side heat insulating materials 5 of the heat insulating panels A adjacent in the horizontal direction (hereinafter referred to as a vertical joint portion) 2a and a joint portion between the normal temperature side heat insulating materials 5 of the heat insulating panel A adjacent in the vertical direction. 2b (hereinafter referred to as a horizontal joint portion) is installed with a jig or the like for receiving the foaming pressure, and the joint material 3 made of a foaming resin such as rigid polyurethane foam is filled by in-situ foaming. The outer surface is shaped into an arc shape along the joint width direction.

Next, in order to prevent deterioration of the heat insulation performance due to the penetration of water (water vapor) into the vertical joint portion 2a and the horizontal joint portion 2b, the outer surface side of the joint material 3 of the vertical joint portion 2a and both sides of the joint material 3 After adhering the vertical joint moisture-proof tape 4a over the outer surface side of the heat insulation panel A, the outer surface side of the joint material 3 of the horizontal joint portion 2b, and the outer surface side of the heat insulation panel A on both sides of the joint material 3 Then, the horizontal joint portion moisture-proof tape 4b is adhered to the end portion of the vertical joint portion moisture-proof tape 4a adhered to the vertical joint portion 2a to provide a heat insulating coating.
The vertical joint moisture-proof tape 4a and the horizontal joint moisture-proof tape 4b can be overlapped and adhered to the room temperature side heat insulating material 5 on both sides of the joint material 3, so that the widths of the respective moisture-proof tapes 4a and 4b can be adhered. For example, one having a width of about 200 mm is used.

As shown in FIGS. 6 and 7, the moisture-proof tape 4 (4a, 4b) has a metal sheet 13 made of aluminum alloy foil and a mesh size of about 2 mm to 5 mm (basis weight: 15 to 50 g / m). ² , a reinforcing sheet 14 formed in a net shape made of a wall made of thermoplastic resin (in this embodiment, high-density polyethylene resin) having a thickness of 50 μm to 200 μm, and an adhesive layer (in this embodiment, thick) The aluminum alloy foil 13 is laminated by an extrusion laminating method so that the aluminum alloy foil 13 enters the mesh 15 of the walliff 14, and a butyl rubber system having a thickness of 400 μm to 1000 μm on the aluminum alloy foil 13 side. An adhesive layer 17 made of an adhesive material is provided and integrated.

  As the aluminum alloy foil 13, an aluminum alloy foil having a thickness specified by an alloy number 1N30 of JISH4160 of 15 μm to 30 μm is laminated in this embodiment, but a thickness specified by an alloy number 8021 or an alloy number 8079 of JISH4160. May be laminated with an aluminum alloy foil of 7 μm to 30 μm.

  The burif 14 is a resin sheet formed in a net shape, and after stretching a high-density polyethylene resin film formed by an inflation method, a splitting process is performed along the stretching direction to produce a web. A plurality of webs are overlapped so that the splitting directions cross each other and fused together with a heat roller or the like to form a mesh, and the width of the splits forming the mesh is the same size It is not limited to the above, but by adjusting the split interval, a mesh formed by split fibers with different widths may be used, and the crossing angle between split fibers is adjusted to an arbitrary angle other than a right angle. Also good.

  As described above, the burif 14 formed in a net shape using a high-density polyethylene resin film is difficult to be wound even when wound and stored in a roll shape, and the moisture-proof tape 4 is attached to the outer surface of the joint material. There is little risk of peeling by the curl when adhering across the side and the outer surface side of the heat insulation panel on both sides.

As described above, the base weight of the walliff 14 is in the range of 15 to 50 g / m ² , the aluminum alloy foil 13 having a thickness specified by the alloy number 1N30 of JISH4160 of 15 μm to 30 μm, and the alloy of JISH4160. The aluminum alloy foil 13 having a thickness specified by No. 8021 or Alloy No. 8079 having a thickness of 7 μm to 30 μm is good in that it enters the mesh 15 of the burif 14, but for the purpose of further promoting the penetration of the burif 14 into the mesh 15. A basis weight of 15 to 50 g / m ² and a mesh size of ² to 5 mm are desirable.

The thermoplastic resin constituting the wallif 14 is preferably a high-density polyethylene in consideration of light weight, dropping of tools, parts and members during construction, damage during transportation, and cost. Commercially available thermoplastic resins such as medium density polyethylene, polypropylene, nylon, Teflon, polyethylene terephthalate, polyvinylidene chloride, and polycarbonate may be used.
Moreover, you may comprise the metal sheet 13 with copper, iron, stainless steel, etc. other than aluminum alloy foil.

  In addition, as a method of manufacturing the laminated body 18 in which the aluminum alloy foil 13 and the wallet 14 are laminated and integrated, there is a dry laminating method in which bonding is performed using a urethane or isocyanate adhesive in addition to the extrusion laminating method.

The butyl rubber-based adhesive material constituting the adhesive layer 17 is obtained by adding polyisobutylene rubber to isobutylene-isoprene-based rubber. The adhesive material is dissolved and applied to the aluminum alloy foil 13 side of the laminate 18 to adhere Layer 17 is provided.
Polyisobutylene rubber may be used as the butyl rubber adhesive, and the adhesive layer 17 may be composed of an acrylic, natural rubber, silicon rubber, or styrene isoprene styrene adhesive. .

The moisture-proof tape (hereinafter referred to as the moisture-proof tape for the main construction method) 4 used in the heat-insulating construction method according to the present invention and the moisture-proof tape (hereinafter referred to as the moisture-proof tape for the conventional construction method) 19 used in the conventional thermal insulation construction method shown in FIG. In order to compare the rigidity, the aluminum alloy foil (thickness: 25 μm) 13 and the walif (basis weight: 35 g / m ² , thickness) which are defined by the alloy number 1N30 of JISH4160, constituting the moisture-proof tape 4 for this construction method : Aluminum layer foil (thickness: 25 μm) 13 constituting the laminated body (average thickness: 140 μm) 18 and the moisture-proof tape 19 for the conventional construction method. And a polyethylene terephthalate film (thickness: 50 μm) 16 as a protective layer and laminated by a dry laminating method in which the adhesive layer 22 is used for adhesion. The body (average thickness: 80 μm) 20 was evaluated by a tensile test, and the results are shown in Table 1.

  From this result, it was found that the rigidity of the laminate 18 of the moisture barrier tape 4 for this construction method was reduced to about half in the temperature range of 0 ° C. to 40 ° C. compared to the laminate 20 of the moisture barrier tape 19 for the conventional construction method. It could be confirmed.

Also, an aluminum alloy foil (thickness: 25 μm) 13 specified by alloy number 1N30 of JISH4160 and a wallet (basis weight: 35 g / m ² , mesh spacing: 2 mm, thickness: 100 μm) 14 are laminated and integrated. The laminated body 18 is provided with a moisture-proof tape 4 for this construction method provided with an adhesive layer (thickness: 500 μm) 17 made of butyl rubber, an aluminum alloy foil (thickness: 25 μm) 13 shown in FIG. 9, and polyethylene terephthalate as a protective layer. A conventional moisture barrier tape 19 having a pressure-sensitive adhesive layer (thickness: 500 μm) 17 made of butyl rubber on a laminate 20 in which a film (thickness: 50 μm) 16 is bonded and integrated with an adhesive layer 22; density polyethylene resin CLAF (basis weight: 35g / m ^2, the mesh spacing: 2 mm, thickness: 100 [mu] m) 14 on an alloy number 1N30 of JISH4160 Aluminum alloy foil (thickness: 7 [mu] m) to a constant 13 were laminated, were compared compressive displacement follow-up with the comparative moisture tape 21 is provided with adhesive layer 17 with a thickness of 400μm made of butyl rubber.

  That is, between the low temperature side heat insulating material 6 of one heat insulation panel A and the low temperature side heat insulation material 6 of the adjacent heat insulation panel A using three sheets of the heat insulation panel A whose outer dimensions are 1200 mm × 900 mm and the thickness is 225 mm. Each heat insulation panel A was fixed to a staggered pattern so that no gap was formed in the panel and withstands the foaming pressure.

  At this time, the joint width between the room temperature side heat insulating materials 5 of the vertical joint portion 2a is set to 60 mm on the low temperature side heat insulating material 6 side, and the surface material 5a side for the joint portions 2 between the respective heat insulating panels A in order to match the execution time. 30 mm, and the joint width between the room temperature side heat insulating materials 5 of the horizontal joint portion 2b is 100 mm on the low temperature side heat insulating material 6 side and 70 mm on the surface material 5a side, and polyurethane is formed on the joint portions 2a and 2b. After foaming and injecting foam (joint material) 3, as a test panel, as shown in FIG. 8, a test with an outer dimension of 400 mm × 400 mm and a thickness of 60 mm including the intersection of joint parts 2a and 2b Two bodies (hereinafter referred to as sample 1 and sample 2) of each of the test bodies B1, B2, and B3 were cut out from the polyurethane foam portion, and each of the samples 1 and 2 of the test body B1 was subordinate to the samples B1, B2, and B3. The moisture-proof tape 19 for construction method is stuck on the outer surface of the polyurethane foam 3, and the samples 1, 2 of the specimen B2 are stuck with the moisture-proof tape 4 for construction method on the outer surface of the polyurethane foam 3, and the specimen B3 In each of samples 1 and 2, a comparative moisture-proof tape 21 was attached to the outer surface of the polyurethane foam 3.

  In each sample 1, 2 of each specimen B1, B2, B3, the surface of the polyurethane foam 3 of each joint 2a, 2b is pressed with a foam pressing tape (made of polyester resin) to withstand the foaming pressure, A skin layer was formed on the surface of the polyurethane foam 3, and the surface state to which the moisture-proof tapes 4, 19, and 21 were applied was made uniform.

  Similarly to the implementation, each of the moisture-proof tapes 4, 19, and 21 is applied to the horizontal joint portion 2b after first being applied to the vertical joint portion 2a and being pressed by the roller. In the same manner as in the implementation, moistureproof tapes 4, 19, and 21 having a width of about 200 mm were used for the vertical joint 2a and the horizontal joint 2b.

  Tests 1 and 2 of the test body B2 to which the moisture barrier tape 4 for the main construction method is attached, samples 1 and 2 of the test body B1 to which the moisture barrier tape 19 for the conventional construction method is attached, and a comparative moistureproof tape 21 After each of the samples 1 and 2 of the body B3 was cured in a thermostatic chamber at 23 ° C. for 1 day, the samples 1 and 2 of the test bodies B1, B2 and B3 were simulated for the behavior of the cryogenic tank, As shown in FIG. 8, after 20 times of compressive displacement (0.4%) is applied in the vertical direction (X-axis direction shown in FIG. 8), 20 times is also applied in the horizontal direction (Y-axis direction shown in FIG. 8). As a result, the moisture-proof tapes 4, 19, and 21 are peeled off from the samples 1 and 2 of the test bodies B1, B2, and B3 after the test, and the joint material (polyurethane foam) 3 filled in the joint portions 2a and 2b is obtained. Observe the number of wrinkles communicating with the outside air and show in [Table 2] Results were obtained.

  The number of times the compression displacement is applied (20 times) is set to 10 times, which is the number of repetitions of the tank operation design period (20 years), with the frequency of the carrier ship entering the dock once every two years. It is obtained by multiplying.

In Table 2, the number of wrinkles in each sample 1 and 2 of the test body B3 pasted with the comparative moistureproof tape 21 is “0” as in each sample 1 and 2 of the test body B2 pasted with the moistureproof tape 4 for this construction method. However, the comparative moisture-proof tape 21 is formed by laminating aluminum alloy foils 13 having a thickness of 7 μm, which is specified by alloy number 1N30 of JISH4160, and easily permeates water vapor. Insulation performance is likely to deteriorate.
From the above results, it is confirmed that the heat insulation construction method according to the present invention can obtain a high effect on the peeling of the moisture-proof tape 4 for the construction method compared to the moisture-proof tape 19 for the conventional method and the moisture-proof tape 21 for comparison. did it.

  Furthermore, in order to compare the moisture-proof performance of moisture-proof tapes, each of two types of test specimens 1, 2, and 3 prepared using three types of moisture-proof tapes with different specifications was used, and the humidity was 90% at 40 ° C. The water vapor transmission rate was measured for 24 hours under the above environment, and the results are shown in [Table 3].

The test body 1 includes a 7 μm thick aluminum alloy foil 13 defined by the alloy number 1N30 of JISH4160, a high density polyethylene resin burif 14 having a basis weight of 35 g / m ² , a mesh interval of 2 mm, and a thickness of 100 μm. And a moisture-proof tape provided with a butyl rubber adhesive layer 17 having a thickness of 400 μm.
The test body 2 includes a 15 μm-thick aluminum alloy foil 13 defined by the alloy number 1N30 of JISH4160, a high-density polyethylene resin burif 14 having a basis weight of 35 g / m ² , a mesh interval of 2 mm, and a thickness of 100 μm. And a moisture-proof tape provided with a butyl rubber adhesive layer 17 having a thickness of 500 μm.
Specimen 3, the aluminum alloy foil 13 having a thickness of 25μm to define an alloy number 1N30 of JISH4160, a basis weight of 35 g / m ^2, the interval of the mesh thickness at 2mm is a high density polyethylene resin CLAF 14 of 100μm And a moisture-proof tape provided with a butyl rubber adhesive layer 17 having a thickness of 500 μm.

  From [Table 3], it can be seen that when the moisture-proof tape in which the aluminum alloy foil 13 having a thickness of 15 μm or more specified by the alloy number 1N30 of JISH4160 is laminated is used, the water vapor transmission rate becomes substantially zero.

[Other Embodiments]
1. The heat insulation construction method for a tank according to the present invention may use a moisture-proof tape in which a nonwoven fabric or a woven fabric made of resin fibers or natural fibers, or a resin film formed in a net shape is laminated as a reinforcing sheet.
2. The tank thermal insulation construction method according to the present invention may be used to thermally coat a prismatic or cylindrical tank.
3. The tank thermal insulation construction method according to the present invention may be used to thermally coat a tank installed on land.

Partial cutaway side view of tank with thermal barrier coating Partial cutaway plan view of the main part Sectional view along line III-III in Fig. 2 IV-IV sectional view of FIG. Insulation panel perspective view (B) Cross-sectional view of moisture-proof tape (b) Cross-sectional view of moisture-proof tape during shrinkage deformation (c) Cross-sectional view of moisture-proof tape during expansion deformation Exploded perspective view of moisture-proof tape Illustration of test method Cross-sectional view of moisture-proof tape used in conventional methods

Explanation of symbols

2 Joint part 3 Joint material 4 Moisture-proof tape 13 Metal sheet (aluminum alloy foil)
14 Reinforcement sheet (Wariff)
15 mesh 17 adhesive layer A heat insulation panel T tank

Claims (4)

A plurality of heat insulation panels are fixed to the surface of a tank for storing a cryogenic substance, and joint materials are filled in joint portions between adjacent heat insulation panels,
A heat insulating construction method for a cryogenic substance storage tank in which moisture-proof tape is adhered to the outer surface side of the joint material and the outer surface sides of the heat insulating panels on both sides of the joint material,
As the moisture-proof tape, a metal sheet and a reinforcing sheet formed in a net shape are laminated so that the metal sheet enters the mesh of the reinforcing sheet, and an adhesive layer is provided on the metal sheet side so as to be integrated. The thermal insulation construction method of the cryogenic substance storage tank which sticks the adhesion layer over the outer surface side of the joint material and the outer surface side of the heat insulation panel on both sides of the joint material. The heat insulation construction method of the cryogenic substance storage tank of Claim 1 which uses the moisture-proof tape which comprises the said metal sheet for the aluminum alloy foil whose thickness prescribed | regulated by the alloy number 1N30 of JISH4160 is 15 micrometers-30 micrometers. The heat insulation construction method for a cryogenic substance storage tank according to claim 2, wherein a moisture-proof tape is used in which the adhesive layer is made of a butyl rubber adhesive having a thickness of 400 µm to 1000 µm. By splitting the reinforcing sheet into a thermoplastic resin film along the stretching direction to produce a web, and laminating a plurality of webs so that the splitting direction intersects and fusing them together The heat insulation construction method of the cryogenic substance storage tank of any one of Claims 1-3 which uses the moisture-proof tape comprised with the resin-made sheet | seat formed in mesh shape.

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