JPS598072Y2 - Heat insulation material for low temperature piping - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heat insulating material for low temperature piping, including cold insulation piping for liquefied natural gas (hereinafter referred to as L.N.G).

Conventionally, this method of insulation for low-temperature piping involves attaching a heat insulating material to the pipe, and then applying a moisture-proof coating (mastic type) to the surface of the heat insulating material.
is applied to the entire surface to create a moisture barrier layer, and finally the exterior material is applied.

There also seems to be a simpler construction method in which the heat insulating material and the moisture-proof exterior material are glued together in advance, and the joints of the moisture-proof exterior material are treated to be moisture-proof by some method during construction.
However, this construction method is
．． N. In the case of cryogenic insulation such as G, a non-breathable adhesive coating material with excellent elongation rate or thermal conductivity at cryogenic temperatures is used as a joint agent for the joints of rigid polyurethane foam insulation cylinders used as insulation material. However, during construction, this adhesive coating material tends to adhere to the joints of the moisture-proof exterior material, resulting in incomplete moisture-proofing, which is essential for low-temperature insulation.For example, if the adhesive coating material is polyurethane foam, In particular, if overlapped edges of the moisture-proof exterior material are required, the foamed polyurethane foam may adhere to the overlapped edges and interfere with moisture-proofing, or it may not adhere to the overlapped edges of the moisture-proof exterior material. It is then bent at 180 degrees, and a "batten" is used from above to apply pressure to suppress the foaming of the polyurethane foam at the seam. However, during moisture-proofing, the overlapped edges of the moisture-proof exterior material are folded again. By putting it back together, there is a risk that the overlapping edge will cause a tear at the boundary with the insulation material.

In addition, when the moisture-proof exterior material has overlapped edges, there is a risk that tears may occur at the boundary with the heat insulating material during adhesion or molding with the heat insulating rigid polyurethane foam, or during handling.

Especially in low temperature insulation, L. N. G. and L. P. As the temperature reaches extremely low temperatures such as G, the moisture-proofing process must be perfect. If the moisture-proofing process is incomplete, water vapor in the air will enter the insulation material and condense or freeze, destroying the insulation material. death,
This results in a significant decrease in heat retention performance.

Focusing on these points, the present invention uses rigid polyurethane foam as a heat insulating material for the exterior material, taking into consideration moisture prevention from the seams of the cold exterior exterior material, and improves the self-adhesiveness of this rigid urethane/tan foam when foaming. It is an integrated heat insulating material that can be used to further perfect moisture proofing, which is essential for the insulation of low-temperature piping.
Moreover, it is a heat insulating material that aims to provide an inexpensive low-temperature insulation processing method that can be completed in one operation.

That is, in the present invention, a moisture-proof material with a separator is temporarily attached to the four edges of a flexible inorganic sheet that is a cold exterior material that maintains flame retardancy and moisture impermeability, and a rigid polyurethane foam is placed on the surface as a heat insulating material. This is an integrated heat insulating material that utilizes the self-adhesive properties of this rigid polyurethane foam during foaming.

Therefore, during construction, remove the separators attached to the moisture-proof material at the butt parts of the heat-insulating material, that is, the four edges of the inorganic sheet 1, and glue the moisture-proof material of the same material to the joints of the moisture-proof material. Furthermore, by adhering a tape-like inorganic sheet to the surface using an adhesive sealing material, moisture proofing, which is essential for the insulation of low-temperature piping, can be completely achieved.

Also L, N. When using it at extremely low temperatures such as G, apply canvas or cold insulation to the inner surface of the hard polyurethane foam insulation cylinder, which is the contact surface, in the same way as the inorganic sheet bonded above.
Uses integrated insulation through the self-adhesive properties of rigid polyurethane foam.

An embodiment of this invention will be explained with reference to the drawings.

A moisture-proof material consisting of a flexible inorganic sheet 1, which is a heat-insulating exterior material that maintains flame retardancy and moisture impermeability, as shown in FIG. 1, and a separator 2 as shown in FIGS. 2 and 3. As shown in Figure 4 and Figure 5, the separator side is inorganic sheet 4.
The edges are temporarily fixed with adhesive tape 3, and rigid polyurethane foam is used as a heat insulating material on this surface.Using the self-adhesive property of this rigid polyurethane foam when foaming, it is hardened as shown in Figures 6 and 7. This is a heat insulating material in which an inorganic sheet 1, which is a heat insulating exterior material, is integrated on the outer surface of a polyurethane foam heat insulating cylinder 4, and a canvas 8 is integrated on the inner surface.

That is, the rigid polyurethane foam heat-insulating cylinder 4 is adhered to the entire surface of the canvas 8 on the inner surface, the inorganic sheet 1 on the outer surface, and the entire surface of the moisture-proof material 5 on the four edges of the inorganic sheet. Since there is a separator paper 2 on the back side of the moisture proof material at the four edges of 1, the inorganic sheet on that side is not bonded and is in a free state.

To explain how to attach the present invention to piping, as shown in Figures 8 and 9 in the longitudinal direction, remove the separator paper 2 attached to the moisture-proof material 5, and attach a moisture-proof material of the same material to the seam. 5', and then, in the case of horizontal piping, the lower inorganic sheet 1 is adhered to the moisture-proof material 5 with an adhesive sealing material 6, and then the inorganic sheet 1, which is a heat-insulating exterior material, is attached on top of it.
A tape-shaped inorganic sheet 7 made of the same material is inserted into the upper inorganic sheet 1 and bonded to each other using an adhesive sealing material 6.

On the other hand, in the circumferential direction as well, as shown in FIGS. 10 and 11, the separator paper 2 attached to the moisture-proof material 5 is removed, and a moisture-proof material 5' made of the same material is adhered to the seam. The free inorganic sheet 1 on the moisture-proofing material 5 is cut to the same width as the moisture-proofing material 5 and installed.

Therefore, a moisture-proofing material 5' made of the same material as the moisture-proofing material 5 is glued to the seam of the heat-insulating material cut out from the free inorganic sheet 1 on the moisture-proofing material in the circumferential direction, and then a heat-insulating material 5' made of the same material as the moisture-proofing material 5 is glued to the seam of the heat-insulating material. This is a heat insulation construction method in which an inorganic sheet 1 as an exterior material and a tape-shaped inorganic sheet 7 made of the same material are bonded together using an adhesive sealing material 6.

The flexible inorganic sheet 1 used as a heat-insulating exterior material is made of glass cloth, asbestos cloth, carbon fiber fabric, ceramic paper, etc., combined rubber such as chlorosulfonated polyethylene, polychloroprene, tetrafluoroethylene, etc. , natural rubber, plastics such as vinyl chloride, materials laminated with aluminum foil, or metal plates that maintain weather resistance, flame retardancy, and moisture resistance essential for low-temperature insulation. It is a material that has

The moisture-proofing material 5 is conveniently in the form of a tape with a separator paper attached to one side; an example is butyl rubber tape.

This butyl rubber tape has particularly excellent moisture-proofing performance, and in addition, the adhesive force between butyl rubber tapes is strong, so it is suitable as a moisture-proofing material used in the present invention.

Other moisture-proofing materials include chlorosulfonated polyethylene, polychloroprene, asphalts, and silicones.

In any case, separator paper or the like is inserted between the inorganic sheet 1 and the inorganic sheet 1 to prevent it from adhering to the inorganic sheet 1.

The adhesive tape 3 necessary for temporarily fixing these moisture-proofing materials to the inorganic sheet is an adhesive tape, cloth tape, or paper tape.

In addition, in order to ensure the dimensional stability of the hard polyurethane heat-insulating cylinder, which is the heat-insulating material, and to create a structure that can withstand thermal stress at extremely low temperatures, a cellulose-based material, that is, canvas, is suitable for its inner surface.
Other than that, it's cold.

Since the heat insulating material according to this invention has the above-mentioned structure, L. N. Completely moisture-proof, which is essential for insulation of heat-retaining piping, including cold-retaining piping for G, and
Canvas and inorganic sheets are bonded to the inner and outer surfaces of the rigid polyurethane foam insulation cylinder, which is the insulation material, so the rigid polyurethane foam insulation cylinder not only maintains dimensional stability but also withstands thermal stress at extremely low temperatures. Because of its structure, L. N. Excellent as a heat insulating material for G cold insulation piping.

Furthermore, since the heat insulating material and the exterior material are integrated as described above, the construction and process are simple and the cost is low, among other advantages.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a flexible inorganic sheet that is a heat-insulating exterior material used in this invention, Figures 2 and 3 are perspective views of a moisture-proof material used in this invention, and Figures 4 and 5 are A perspective view showing the moisture-proof material temporarily attached to the four edges of the flexible inorganic sheet used in the present invention. Figures 6 and 7 are perspective views and cross-sectional views of the heat insulating material according to the present invention, and Figures 8 and 9. The figures are a perspective view and a sectional view showing the state in which the heat insulating material according to the present invention is installed in the longitudinal direction of the piping.
FIG. 0 and FIG. 11 are a perspective view and a sectional view showing a state in which the heat insulating material according to the present invention is attached in the circumferential direction of the pipe. 1... Inorganic sheet, 2... Separator paper, 3...
... Adhesive tape, 4... Rigid polyurethane foam insulation cylinder, 5... Moisture-proofing material, 5'... Moisture-proofing material made of the same material as the moisture-proofing material in 5, 6... Adhesive sealing material, 7... Tape-shaped flexible inorganic sheet, 8...Canvas.

Claims (1)

[Scope of utility model registration request] A flame-retardant heat-retardant cylinder having a vertically divided cylindrical rigid polyurethane foam heat-retaining tube 4 with an interior material made of canvas 8 on the inner surface, and a moisture-proof material 5 with a separator paper 2 attached to the western edge of the outer surface of the heat-retardant tube 4. - Exterior materials made of moisture-impermeable and flexible inorganic sheets 1 are bonded together by the self-adhesive properties of this rigid polyurethane foam during foaming, and the inorganic sheets 1 are made into moisture-proof materials 5. On the other hand, it is formed in a free state by the separator paper 2, and the heat insulating cylinder 4
The joint between the heat insulating cylinders 4 and 4 that occurs when the insulation tubes 4 and 4 are installed is covered with a moisture-proof material 5' made of the same material as the moisture-proof material 5, a tape-shaped inorganic sheet 7, and an adhesive sealing material 6. Features: Insulating material for low-temperature piping.