JP4362751B2 - Cold storage structure for cryogenic fluid transport piping - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a cooling structure of a transport pipe that handles a low-temperature fluid such as LNG, LPG, ethylene, LN ₂ , LOX, DME, or ethylene glycol.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a cold insulation structure for a transport pipe that handles a low-temperature fluid, two or more layers of a cold insulation structure are frequently used when the cold insulation thickness exceeds 75 mm or when the fluid temperature falls below −50 ° C.
[0003]
FIG. 6 shows a two-layer cold insulation structure. The outer peripheral surface of the pipe 1 is covered with a split tubular molded heat insulating material 2 such as rigid polyurethane foam as a heat insulating material on the inner layer side. Secure with.
[0004]
The outer peripheral surface of the inner layer heat insulating material is covered with a split tube type heat insulating material 7 using a polyurethane foam integrally formed with a moisture-proof material as an outer layer heat insulating material, which is fixed with a band 8, and the heat insulating material 7 The joint portion in the circumferential direction and the joint portion in the tube axis direction are filled with oil joint sealers, low temperature adhesives such as urethane and epoxy, or joint materials 9a and 9b by in-situ foam injection of polyurethane foam. Then, it is covered with moisture-proof adhesive tapes 10 and 11 made of butyl rubber as a base material, and further, an oily / synthetic rubber mastic is applied to the surface of the outer layer material, and the metal sheathing material 12 is wound thereon.
[0005]
[Problems to be solved by the invention]
The cold insulation structure by the above-mentioned molded heat insulating material cannot maintain the initial performance due to aging deterioration of the mastic / moisture-proof film used or gaps during construction, etc., and often deteriorates. In many cases, replacement is required.
[0006]
In this case, deterioration often proceeds from the jointed joints of the molded heat insulating material or the molded heat insulation on the outer layer side, and even if these absorb water and freeze, the molded heat insulation on the inner layer side is often sound.
[0007]
However, when replacing the molded insulation, the molded insulation on the outer layer is bonded and fixed to the molded insulation on the inner layer using an adhesive, sealant, or injection foam material applied to the joint of the molded insulation on the outer layer. In many cases, the disassembly work is performed using hand tools such as saws, knives, and burls. Therefore, it is not possible to disassemble only the outer layer side heat insulating material, and it is also necessary to remove the inner layer heat insulating material.
[0008]
As described above, in the conventional cold insulation structure with the inner and outer layer molded heat insulating materials, even if only the outer layer side heat insulating material is deteriorated, all the existing heat insulating materials including the inner layer side heat insulating material are replaced. I have to. For this reason, since many molding heat insulation materials required for replacement | exchange and a lot of waste generate | occur | produce, a large repair expense is required.
[0009]
The present invention has been made in view of the above-described problems, and provides a cold insulation structure for a low-temperature fluid transport pipe that can easily disassemble only the outer layer-side formed heat insulating material without damaging the inner layer-side formed heat insulating material. The main purpose is to do.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, in the cold insulation structure for a low temperature fluid transport pipe formed by laminating a molded heat insulating material on the outer periphery of the pipe, the molded heat insulating material to be stacked is a split cylinder type. The molded insulation material is abutted in the circumferential direction of the pipe and the pipe axis direction, and it is easy to disassemble the molded insulation material on the outer layer side between the layers of the molded insulation material without damaging the molded insulation material on the inner layer side JIS for
A protective material excellent in penetration resistance having a C 2318 end tear resistance of 49 N (20 mm width) or more is interposed, and the protective material is on the inner layer side facing the joint portion in the tube axis direction of the molded heat insulating material on the outer layer side. The gist is that it is interposed in the surface portion of the molded heat insulating material .
[0014]
The invention of claim 2 is that, in claim 1, the protective material is a metal thin plate, metal foil tape, metal foil composite tape, PET / polyimide tape having penetration resistance of JIS C 2318 end tear resistance 49N (20 mm width) or more. The gist is that they are selected and used.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of the present invention is shown in FIGS. In addition, the same code | symbol is attached | subjected to the same or similar member as FIG.
1 to 3, 1 is a pipe, 2 is an inner-layer-side split-cylinder molded heat insulating material made of rigid polyurethane foam, 3 is a metal band for binding, 4a and 4b are the inner-layer-side split-cylinder-shaped heat insulating material Glass wool cushion material filled in the butt joint portion in the circumferential direction and the butt joint portion in the tube axis direction, 5 is a metal foil tape covering the joint portion, and 6 is cold resistance wound around the outer peripheral surface of the heat insulating material on the inner layer side. A coating tape made of film, 7 is an outer-layer-side split-cylinder molded heat insulating material made of rigid polyurethane foam, 8 is a binding band, and 9a and 9b are circumferential directions of the outer-layer-side split tube-shaped molded heat insulating material. Glass wool cushion material filled in the butt joint and the butt joint in the tube axis direction, 10 and 11 are moisture-proof adhesive tapes affixed to the joint, and 12 is a metal exterior material. The outer layer side of the heat insulating material prior to mounting, has a configuration in which is interposed a protective material 13 on the surface of the inner layer forming a heat insulating material which faces the joint portion in the tube axis direction of the outer layer.
[0016]
Examples of the protective material 13 include a metal thin plate, a metal foil tape, a metal foil composite tape, and a heat-resistant film / tape such as PET / polyimide having a penetration resistance of JIS C 2318 49 N (20 mm width) or more. Is preferred.
[0017]
In the above cold insulation structure, when disassembling a molded heat insulating material that needs to be replaced due to deterioration among a large number of molded heat insulating materials on the outer layer side attached in the tube axial direction, joints in the tube axial direction of the outer molded heat insulating material For example, a saw blade is applied to the portion that hits the part, and the formed heat insulating material is cut into a circular shape, and the entire formed heat insulating material is crushed and removed therefrom.
[0018]
In this case, even if the cutting saw blade contacts the surface of the inner layer-side molded heat insulating material, the surface is covered with the protective material 13 having penetration resistance, so the inner layer-side formed heat insulating material by the saw blade Can be prevented from being damaged.
[0019]
Moreover, according to the said structure, the coating | cover with the said protective material 13 should just be the surface part which opposes the joint part of the pipe-axis direction of the shaping | molding heat insulating material of an outer layer side, and can reduce material cost and construction work by that much.
[0020]
However, the protective material may cover the entire surface of the molded heat insulating material on the inner layer side. According to this, since there is no restriction on the cutting position into the molded heat insulating material on the outer layer side, it is advantageous in terms of workability.
[0021]
4-5 has shown the structure which connects the cold insulation structure by this invention with the existing heat insulation structure. In addition, the same code | symbol is attached | subjected to the same or similar member as FIGS. 1-3.
[0022]
That is, the boundary with the existing molded heat insulating material 14 constructed on the pipe 1 is the cryogenic adhesives 4c, 4d, 4e, 4f on the inner surface of the inner layer side of the heat insulating material 2, the circumferential direction and the abutting portion in the tube axis direction. Each of the coatings is coated, and the abutting portion with the existing molded heat insulating material 14 is structured to be laminated with the molded heat insulating material 2 on the inner layer side.
[0023]
And after providing the cushioning materials 4a and 4b and the plastic covering tape 6 and covering the outer layer side formed heat insulating material 7, the outer periphery of the existing heat insulating structure portion and the inner layer side formed heat insulating material 2 in the same manner as the heat insulating construction described above. After applying urethane adhesive on the end face, covering the cushion material 15 on the outer periphery to which the urethane adhesive was applied, and forming the heat insulating material 16 by injection foaming of urethane foam at the butt portion in the circumferential direction, the moisture-proof tape 17 Is pasted. Reference numeral 13 denotes a protective material provided on the surface of the inner layer-side molded heat insulating material 2 facing the joint portion in the tube axis direction of the outer layer-side formed heat insulating material 7.
[0024]
【The invention's effect】
As described in detail above, according to the present invention, in the cold insulation structure for a low-temperature fluid transport pipe formed by laminating a molded heat insulating material on the outer periphery of the pipe, a protective material having excellent penetration resistance is provided between the layers of the molded heat insulating material. Since it is interposed, when disassembling using a hand tool such as a saw, a knife, or a bar, it is possible to disassemble only the outer layer-side molded heat insulating material without damaging the inner layer-side formed heat insulating material.
[0025]
Moreover, it becomes possible to replace | exchange only the shaping | molding heat insulating material by the side of the outer layer deteriorated by this, and reduction of the amount of used materials and the amount of generated waste can be aimed at.
[0026]
In addition, it becomes possible to further extend the life of the molded heat insulating material on the inner layer side due to the intervention of the protective material.
[0027]
Moreover, when transporting the low temperature fluid in the pipe, that is, replacing the outer layer side heat insulating material in a low temperature state, the protective material can also be expected to prevent the leakage of cold air from the joint portion of the inner layer side heat insulating material.
[Brief description of the drawings]
FIG. 1 is a perspective view of a cold insulation structure for a cryogenic fluid transport pipe showing an embodiment of the present invention.
FIG. 2 is a partial cross-sectional view of a cold insulation structure.
FIG. 3 is a vertical cross-sectional view of a cold insulation structure.
FIG. 4 is a cross-sectional view showing a connecting portion between an existing heat insulating structure and a cold insulating structure.
5 is a longitudinal sectional view of FIG. 4. FIG.
FIG. 6 is a perspective view of a conventional cold insulation structure for a cryogenic fluid transport pipe.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pipe 2 Inner layer side molded heat insulating material 3 Metal band 4a, 4b Cushion material 5 Metal foil tape 6 Cold-resistant film tape 7 Outer layer side molded heat insulating material 8 Metal band 9a, 9b Joint material 10, 11 Moisture-proof adhesive tape 12 Metal exterior Material 13 Protective material 14 Existing molded heat insulating material 4c, 4d, 4e, 4f Cryogenic adhesive 15 Cushion 16 Molded heat insulating material 17 for injection foam Moisture-proof tape

Claims (2)

In the cold insulation structure of a low-temperature fluid transport pipe formed by laminating a molded heat insulating material on the outer periphery of the pipe, the molded heat insulating material to be laminated is obtained by abutting the split-tube shaped heat insulating material in the circumferential direction of the pipe and the pipe axis direction. There is a JIS for facilitating disassembly of the molded heat insulating material on the outer layer side between the layers of the molded heat insulating material without damaging the molded heat insulating material on the inner layer side.
A protective material excellent in penetration resistance having a C 2318 end tear resistance of 49 N (20 mm width) or more is interposed, and the protective material is on the inner layer side facing the joint portion in the tube axis direction of the molded heat insulating material on the outer layer side. A cold insulation structure for a low-temperature fluid transport pipe, characterized in that it is interposed in a surface portion of a molded heat insulating material .  The said protective material is selected and used from the metal thin plate which has penetration resistance more than JIS C 2318 end tear resistance 49N (20 mm width), a metal foil tape, a metal foil composite tape, and a PET polyimide film. Cold storage structure for low temperature fluid transport piping.

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