JP5986672B2 - Insulation cover device construction method - Google Patents

Description

  The present invention provides a heat insulating cover device in which a urethane foam covering the outer periphery of a low-temperature fluid pipe is provided over the entire circumference, and the outer surface of the urethane foam is covered with a water-impermeable exterior material so as to be heat-insulated. It is related with the construction method of the heat insulation cover apparatus which uses A.

  Conventionally, for example, in order to keep the outer periphery of low-temperature fluid piping such as LNG and LPG-related piping equipment, the heat insulating cover device has only covered an exterior material made of a thin steel plate outside the urethane foam. (For example, see Patent Document 1).

JP 2001-108189 A

In the heat insulating cover device, the urethane foam is cooled by the cold heat from the low-temperature fluid piping, the gas in the heat insulating space tends to be depressurized, and the inside of the heat insulating cover device tends to be depressurized.
And by the pressure reduction, water vapor | steam is attracted | sucked by urethane foam from external air, and it accumulates as water and ice, and heat retention performance falls.
In addition, although the above-described heat insulating cover device is resistant to ultraviolet rays and the like, there is a problem that water enters from the seam of the steel plate or corrodes by rainwater or seawater and water enters the cover and the heat insulating property is lowered. is there.

  Accordingly, an object of the present invention is to provide a method for constructing a heat insulating cover device that can eliminate the above-mentioned problems and prevent intrusion of water vapor and water while improving weather resistance.

  The first feature of the construction method of the heat insulating cover device of the present invention is that the urethane foam covering the outer periphery of the low temperature fluid pipe is formed in a cylindrical shape along the periphery of the low temperature fluid pipe, and the cylinder The shape is divided into a circumferential direction and a length direction, and the outer peripheral surface in the pipe radial direction of the divided urethane foam is covered with a moisture-proof material layer provided with a metal foil, and the outer side of the moisture-proof material layer is impermeable to water. The cover material formed of a sheet made of chlorosulfonated polyethylene is integrally attached to form a split cover, and the cover material in the split cover on one side that is on the upper side when attached to the low-temperature fluid piping is Prepare a heat insulating cover device provided with an exterior material extending part that protrudes outside the outer edge in the circumferential direction of the urethane foam. After attaching the heat insulating cover device so as to cover the outer peripheral portion of the cryogenic fluid piping, leaving the attachment portion in the outer material extending portion and the vicinity thereof in the outer material, the circumferential direction in the divided cover At one end edge of the butt joint, a moisture-proof tape having a metal foil layer is pasted between adjacent moisture-proof material layers, the moisture-proof tape is covered from the outside, and the exterior of the divided cover on one side The exterior material extension portion is attached so that the material extension portion covers a part of the exterior material of the adjacent split cover on the other side.

According to the first characteristic configuration of the present invention, the inside of the heat insulating cover device is in a reduced pressure state by cooling with a low-temperature fluid by covering the outer peripheral surface in the pipe radial direction of the urethane foam with the moisture-proof material layer provided with the metal foil. Thus, even if water vapor in the outside air is to be sucked into the urethane foam, the metal foil of the moisture-proof material layer prevents the heat retention performance of the urethane foam.
In addition, the moisture-proof material layer with the metal foil can prevent the carbon dioxide gas, etc. that is generated during foam molding in each foaming space of the urethane foam from escaping to the outside. Can be maintained.
In addition, a non-water-permeable exterior material is integrally attached to the outside of the moisture-proof material layer, and the exterior material is composed of a sheet made of chlorosulfonated polyethylene, so that the chlorosulfonated polyethylene constituting the exterior material is formed. Is strong against wind and rain and can withstand long-term use, and moreover, it is lighter and does not corrode than conventional sheet metal exterior materials.
In addition, a conventional sheet metal exterior material mounting requires special sheet metal processing technology such as gobbling on the installation site, whereas the heat insulating cover device of the present invention requires such special processing. It can be installed easily and workability can be improved.
The chlorosulfonated polyethylene is integrally attached to the outer circumferential surface of the pipe in the divided urethane foam to form a divided cover. It is possible to easily heat-insulate the low-temperature fluid piping by simply covering the cover, thereby improving workability.
Therefore, it is possible to form a highly weather-resistant pipe heat insulating structure with excellent waterproof performance in a short time with simple construction.
When the divided cover is attached to cover the outer periphery of the fluid piping, the divided cover on one side is arranged on the upper side of the fluid piping so that it extends beyond the outer edge in the circumferential direction of the urethane foam. The provided exterior material can serve the same function as an umbrella and cover the other divided cover to be mounted from below.
Therefore, even if water drops such as rain fall at the construction site at the time of construction, the fluid piping is installed by attaching the other side cover from the lower side while attaching the one side divided cover to the fluid piping from above. It is possible to provide a heat insulating cover device that can prevent water from entering between the cover and the split cover and maintain high heat insulating performance.
By adhering a moisture-proof tape with metal foil to the butt joint at the edge of one edge in the circumferential direction of the split cover, it is possible to prevent water vapor in the outside air from entering from the butt joint. By covering the extended portion of the exterior material so as to cover from the above, it is possible to protect the moisture-proof tape from ultraviolet deterioration, and the heat insulation performance of the low-temperature fluid piping device by the heat insulation cover device can be maintained high over a long period of time.

  The 2nd characteristic structure of this invention exists in the place which integrated each one end edge part in the circumferential direction of a pair of said divided | segmented urethane foam with a series of said exterior materials.

  According to the second characteristic configuration of the present invention, since a pair of divided urethane foams are integrated with a series of exterior materials at one end edge portion, for example, heat insulation construction for a small-diameter pipe can be performed in a short time. This can be done and the construction can be speeded up.

  The feature structure of the construction method of the 3rd heat insulation cover apparatus of this invention is the said low-temperature fluid which protruded outward rather than the said exterior material, after mounting | wearing a heat insulation cover apparatus so that the outer peripheral part of the said low-temperature fluid piping might be covered. With respect to the protruding member attached to the pipe, in a state where the band of chlorosulfonated polyethylene has been softened, the band is disposed along the peripheral portion of the protruding member so as to cover the boundary between the exterior material and the protruding member. It is in the place where it winds, making it adhere | attach and integrates over the said exterior material and the said protrusion member.

  According to the third characteristic configuration of the present invention, in a state in which the belt-like body of chlorosulfonated polyethylene is softened with respect to the projecting member attached to the low-temperature fluid pipe projecting outward from the exterior material, A body is wound around the periphery of the projecting member so as to cover the boundary between the exterior material and the projecting member, and is bonded and integrated across the exterior material and the projecting member. It is possible to prevent the intrusion of rainwater from the boundary between the projection member and the water vapor in the outside air, and maintain the heat insulation performance of the urethane foam in the heat insulating cover device over a long period of time.

  According to a fourth characteristic configuration of the present invention, when the divided cover is mounted on the outside of the low-temperature fluid pipe, a moisture absorbing sheet is disposed on the inner side of the divided cover.

It is a disassembled perspective view in the heat insulation cover apparatus of this invention. It is a perspective view of the assembled state in the heat insulation cover apparatus of this invention. It is sectional drawing of the heat insulation cover apparatus of this invention. It is sectional drawing of the heat insulation cover apparatus of another embodiment. It is sectional drawing of the heat insulation cover apparatus of another embodiment. It is sectional drawing of the heat insulation cover apparatus of another embodiment. It is sectional drawing in the middle of attachment to piping in the heat insulation cover apparatus of another embodiment. It is sectional drawing after the mounting | wearing to piping with the heat insulation cover apparatus of FIG. It is sectional drawing of the heat insulation cover apparatus of another embodiment. It is sectional drawing before the mounting to piping in the heat insulation cover apparatus of another embodiment. It is sectional drawing after the mounting | wearing to piping with the heat insulation cover apparatus of FIG. It is a thermal insulation cover apparatus with respect to a valve | bulb, and is an exploded perspective view of a urethane foam. It is a heat insulation cover apparatus with respect to a valve | bulb, and is a partially notched perspective view of the mounting state of a urethane foam. It is a heat insulation cover apparatus with respect to a valve | bulb, and is a longitudinal cross-sectional view of the mounting state of a urethane foam. In a heat insulating cover device for a valve, (a) is an exploded perspective view of a split casing, (b) is an exploded perspective view of a split casing and a covering layer, and (c) is a split casing and a covering layer. FIG. It is a partially cutaway perspective view when the heat insulating cover device is attached to the valve. It is a perspective view after mounting | wearing with the heat insulation cover apparatus with respect to a valve | bulb. It is a perspective view which shows the seat attachment procedure around a valve stem after mounting | wearing the heat insulation cover apparatus to a valve | bulb, (a) is before seat installation, (b) is at the time of seat installation, (c) shows after seat installation.

Embodiments of the present invention will be described below with reference to the drawings.
[First Embodiment]
As an example of the heat insulating cover device for the fluid piping device, as shown in FIGS. 1, 2, and 3, a hard urethane foam 2 that covers the outer periphery of the large-diameter fluid piping 1 over the entire circumference is provided. 2 is formed in a cylindrical shape along the periphery of the fluid piping 1, and is divided into a circumferential direction and a length direction of the cylindrical shape, and a metal foil is provided on the outer circumferential surface of the divided urethane foam 2 in the radial direction of the piping. The moisture barrier layer 21 provided is covered, and the outer cover 3 made of non-permeable chlorosulfonated polyethylene is integrally attached to the outside of the moisture barrier layer 21 to form the divided cover 4. is there.
Then, the fluid pipe 1 is covered with the plurality of divided covers 4 so as to be sandwiched from the pipe radial direction, and the joining edges are bonded with the urethane-based adhesive 6 and straddle the joining edges. Then, a moisture-proof tape 5 with an adhesive 13 provided with an aluminum foil (an example of a metal foil) is attached, and an exterior tape 25 made of chlorosulfonated polyethylene having a width wider than that of the moisture-proof tape 5 is attached to the phenolic poly A heat insulating cover device which can be attached by heat bonding with the adhesive 7 made of chloroprene and can cover the fluid pipe 1 with heat is formed.
In addition, a silicone caulking material 8 is applied to both end edges of the exterior tape 25 to further prevent moisture.
The moisture-proof tape 5 may be attached using an adhesive in addition to the pressure-sensitive adhesive 13.

The urethane foam 2 is made of a hard foamed polyurethane having a foaming ratio of 30 times. The chlorosulfonated polyethylene as the exterior material 3 has a density of 1.3 g / cc (Max) and a moisture permeability coefficient of 0.75 g / m ^2. 24hrs (mastic (3.2mm thickness) 0.98 or less) composed of heat-resistant and flame-retardant synthetic resin sheet with excellent water resistance, durability and weather resistance, thickness 1mm (± 10%) A glass cloth 9 is embedded and reinforced in the wall thickness.
Accordingly, the outer packaging material 3 of the chlorosulfonated polyethylene can be used for a long period of time for heat insulation of the outdoor pipe while preventing rainwater from entering the urethane foam 2 and with little deterioration of ultraviolet rays. It can be well protected.

  In integrating the exterior material 3 and the urethane foam 2, the sheet-like exterior material 3 integrated with the moisture-proof material layer 21 is laid in a semi-cylindrical mold, and then filled with polyurethane and foamed. , Which is integrated at the time of the foam curing.

[Another embodiment]
Other embodiments will be described below as modified examples of the first embodiment.
<1> Integration of the exterior material 3 and the urethane foam 2 is performed by attaching the sheet-shaped exterior material 3 to the outer peripheral surface of the urethane foam 2 with the moisture-proof material layer 21 via an adhesive 7. They may be integrated. Further, the integration may be performed on site before the cold insulation construction.
<2> When the fluid pipe 1 is heat-insulated by the heat insulating cover device, rainwater or water vapor may invade between the fluid pipe 1 and the urethane foam 2 due to bad weather. In order to prevent the outer foam material 2 from being damaged by impregnating the urethane foam 2 to reduce the heat insulation performance, or by freezing and expanding by the refrigerant circulating in the fluid pipe 1 and applying tension to the exterior material 3. As shown in FIG. 4, the moisture absorbing sheet 10 may be arranged inside the divided cover 4. In this case, even if the moisture absorbent sheet 10 is integrally attached to the inside of the divided cover 4, it is formed separately from the divided cover 4, and before the divided cover 4 is attached to the fluid pipe 1, the fluid pipe 1. It may be wrapped around the outer surface. In addition, this moisture absorption sheet 10 may be a part other than the state over the perimeter of the outer surface of the fluid piping 1. Therefore, even if water or water vapor enters the inside of the split cover, the moisture absorbing sheet disposed inside the pipe radial direction of the split cover absorbs and removes the moisture, reducing the heat insulation performance of the urethane foam. Or the risk of adiabatic breakage due to freezing of intruding moisture can be prevented.
<3> Further, when the moisture absorbing sheet 10 is disposed between the fluid pipe 1 and the divided cover 4 and then absorbs moisture and freezes and expands, in order to prevent tension from acting on the exterior member 3 due to the expansion. In addition, as shown in FIG. 5, an elastic sheet 11 formed of a sponge or an inorganic fiber material that absorbs the volume expansion of the moisture absorbent sheet 10 may be provided. The elastic sheet 11 may be disposed between the moisture absorbent sheet 10 and the fluid pipe 1 in addition to the moisture absorbent sheet 10 and the divided cover 4. Therefore, even if the hygroscopic sheet freezes and expands after absorbing intrusion water, the elastic sheet absorbs the volume expansion, and the possibility that the exterior material is damaged due to the pressure applied to the urethane foam or the tension applied to the exterior material can be reduced.
<4> The urethane foam 2 has a moisture absorbent material 12 such as silica gel, calcium oxide, and a water-absorbing polymer embedded in the thickness as shown in FIG. It may be distributed.
<5> As shown in FIG. 7 and FIG. 8, the urethane foam 2 is divided into two in the circumferential direction, and the divided cover 4 on the upper side when attached to the fluid pipe 1 is placed on the periphery of the urethane foam 2. When the split cover 4 is attached so as to cover the outer peripheral portion of the fluid pipe 1, the split cover 4 on one side is fluidized. The outer material extending portion 3 </ b> A extending so as to protrude outward from the outer edge in the circumferential direction of the urethane foam 2 by being arranged on the upper side of the pipe 1 has the same function as an umbrella and below it. It is possible to cover the other side divided cover 4 to be attached to prevent rainwater or the like from entering between the divided cover 4 and the fluid pipe 1 even during construction. It should be noted that the exterior material extending portion 3 </ b> A extending outward from the outer edge in the one side divided cover 4 is overlapped from above the divided cover 4 mounted on the lower side via the adhesive 7. By winding and adhering, it is possible to further prevent water from entering the urethane foam 2. In this case, the exterior material extending portion 3A leaves the unbonded portion with the outer end portion of the urethane foam 2 (FIG. 7), and adheres the moisture-proof tape 5 to the joint portion, and then integrally adheres from above ( FIG. 8).
<6> As shown in FIG. 9, on the end surface of the divided cover 4 that is abutted in the circumferential direction of the pipe, a joint portion 14 in which adjacent members are fitted to each other is provided. Water penetration and heat leakage may be reduced to improve heat insulation.

[Second Embodiment]
When the fluid piping device is a small-diameter fluid piping 1, as shown in FIGS. 10 and 11, the heat insulating cover device is connected to one end edge in the circumferential direction of the exterior material 3 of each of the pair of divided covers 4. Are integrated together, and after covering the outer peripheral surface of the fluid piping 1 with the divided urethane foam 2, the exterior material extending portion 3 </ b> A provided at the other end edge is overlapped with the exterior material 3 and bonded. By winding and adhering via the material 7, it may be possible to further prevent water from entering the urethane foam 2. In addition, the moisture-proof tape 5 is affixed on the lower part of the exterior material extending part 3A at the joining part of the edge parts of the divided cover 4.
The outer peripheral surface of the urethane foam 2 is integrated with a moisture-proof material layer 21 having a metal foil such as an aluminum foil interposed between the outer foam material 3 and the exterior material 3.

[Third Embodiment]
As a heat insulating cover device for a valve V other than the fluid pipe 1, for example, a valve V (generally referred to as a fluid pipe and a valve or a flange), as shown in FIG. 12 to FIG. A urethane foam 2 is provided (FIG. 12), and the outer surface of the urethane foam 2 is covered with a water-impermeable exterior material 3 so that it can be thermally insulated. The urethane foam 2 is formed in a shape along the periphery of the valve V and divided in the circumferential direction thereof, and the exterior material 3 for covering the outer side of the divided urethane foam 2 is constituted in the circumferential direction. A split casing 15 made of sheet metal to be split is provided (FIG. 15A), and a coating layer 16 of chlorosulfonated polyethylene is provided on the outer peripheral surface of the split casing 15 (FIG. 15B) to constitute a heat insulating cover device. (FIGS. 15A to 15C).
In addition, the moisture-proof material layer 21 provided with metal foils, such as aluminum foil, is adhere | attached and integrated with the outer peripheral surface of the urethane foam 2 (FIG. 13, FIG. 14, FIG. 16).

In the gap between the urethane foam 2 and the valve V, a cotton-like heat insulating material such as glass wool or a filler 22 such as an injecting polyurethane resin is packed to improve the heat insulation (FIG. 14).
The covering layer 16 is formed by bonding a sheet made of chlorosulfonated polyethylene to the outer peripheral surface of the divided casing 15 via an adhesive, and one of the pair of divided casings 15 is covered with One end portion of the layer 16 is provided with an extended ear portion 17 for overlapping the covering layer 16 adhered to the other divided casing 15 (FIGS. 15, 16, and 17).
Further, after applying a moisture-proof tape to the outer surface of the joint portion (inner fillet portion) between the straight pipe portion and the exterior material 3, a resin angle molded product 19 is attached to eliminate the gap (see FIG. 17).

  In the fluid piping device, a butyl moisture-proof tape with aluminum foil is applied around the protruding valve stem 20 as shown in FIGS. 18 (a), 18 (b), and 18 (c). A sheet 23 made of chlorosulfonated polyethylene similar to that of the material 3 is wound and pressure-bonded in a heated and softened state, and then bonded and integrated.

  In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry. In addition, it goes without saying that the present invention can be carried out in various modes without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Fluid piping 2 Urethane foam 3 Exterior material 3A Extension part 4 Dividing cover 5 Moisture-proof tape 10 Hygroscopic sheet 11 Elastic sheet 15 Divided casing 21 Moisture-proof material layer

Claims (4)

The urethane foam covering the outer periphery of the cryogenic fluid piping over the entire circumference is formed into a cylindrical shape along the periphery of the cryogenic fluid piping, and is divided in the circumferential direction and the length direction of the cylindrical shape, and the divided The outer peripheral surface in the pipe radial direction in the urethane foam is coated with a moisture-proof material layer provided with a metal foil,
On the outside of the moisture barrier layer, an exterior material composed of a non-permeable sheet made of chlorosulfonated polyethylene is integrally attached to form a divided cover,
A heat insulating cover provided with an exterior material extending portion that protrudes outward from an outer edge portion in the circumferential direction of the urethane foam on the exterior material of the one side divided cover that is on the upper side when attached to the low-temperature fluid piping. Prepare the equipment,
Leave the non-adhered part with the outer end of the urethane foam in the exterior material extension part and its vicinity in the exterior material,
After mounting the heat insulating cover device so as to cover the outer peripheral portion of the cryogenic fluid pipe, a metal foil layer is formed across the adjacent moisture-proof material layers at the butt joint at the circumferential edge of the divided cover. Apply the moisture-proof tape provided,
Covering the moisture-proof tape from the outside, and extending the exterior material extension part so that the exterior material extension part of the split cover on one side covers a part of the exterior material of the adjacent split cover on the other side. Construction method of heat insulating cover device to be attached.   The construction method of the heat insulation cover apparatus of Claim 1 which integrated each one end edge part in the circumferential direction of a pair of said divided | segmented urethane foam with a series of said exterior materials.   After mounting the heat insulating cover device so as to cover the outer peripheral portion of the low-temperature fluid piping, a strip of chlorosulfonated polyethylene with respect to the protruding member attached to the low-temperature fluid piping protruding outward from the exterior material In the softened state, the belt-like body is wound around the periphery of the projecting member so as to cover the boundary between the exterior material and the projecting member, and spans the exterior material and the projecting member. The construction method of the heat insulation cover apparatus of Claim 1 or 2 which carries out adhesion | attachment integration.   The construction method of the heat insulation cover apparatus as described in any one of Claims 1-3 with which a moisture absorption sheet is arrange | positioned inside the said division | segmentation cover when the said division | segmentation cover is mounted | worn on the outer side of the said cryogenic fluid piping.

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