JPH0135100Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a heat insulating support device for cryogenic piping that transports cryogenic fluids such as LPG and LNG.

Conventionally, as shown in FIG. 3, as a pipe insulation support device for a low-temperature piping facility, a low-temperature insulation material 2 is wrapped around the outer peripheral surface of a pipe 1 made of a low-temperature metal material such as stainless steel, and a A heat-insulating support in which a heat-insulating support 4 for supporting low-temperature pipes is placed on a pedestal 3 that is wrapped with a moisture-proof material, an exterior material, etc., and is placed at a required interval along the pipe line. equipment is used.

The heat insulating support 4 needs to have performance as a heat insulating material for the main body and a structural material for supporting the low-temperature piping, and therefore is made of a material with excellent heat insulating properties and compression resistance, such as high-density synthetic resin foam. In addition, since low-temperature piping expands and contracts as the temperature changes during use, it is necessary for the insulating support to move along with it on the pedestal 3 accordingly. Fixed.

Conventionally, methods for fixing the heat insulating support to the piping include fastening and fixing the heat insulating support from the outside using a fastening plate, fastening band, etc., and fastening the heat insulating support to the pipe using a metal stopper welded to the pipe. A means for clamping, a means for integrally attaching a metal fixing plate formed in the shape of an arc gutter to the upper surface of the heat insulating support so that the pipe can be held and supported, and a means for welding and fixing the fixing plate to the pipe, using an adhesive. A means of adhesively fixing the two together is employed.

However, the means for fastening and fixing the heat insulating support has a drawback that the fastening force decreases due to temperature changes and aging. In particular, for large items, it is difficult to maintain and ensure the fastening force, such as not being able to fasten until the required fastening force is reached.
The method of using the stoppers and fixing plates involves welding, so special skills are required.
There are disadvantages in terms of workability and economy, and the use of open flames may have an adverse effect on the piping, and there are disadvantages such as heat intrusion from the stopper.

In this respect, the adhesive fixing means is widely used because it does not have the above disadvantages, but in order to ensure the reliability of the adhesive work and adhesive effect, it is necessary to use an adhesive with a relatively long pot life. Therefore, it takes a long time for the uncured adhesive composition to cure and achieve the required strength, and the curing reaction is affected by environmental conditions and the material of the adherend, making it difficult to work. There are problems with quality and quality control.

Although this invention was made in order to take advantage of all the excellent characteristics of the most excellent adhesive fixing means as a means for fixing the heat insulating support to the piping, and to eliminate all of the above-mentioned conventional drawbacks, The low-temperature pipe and the arcuate gutter-shaped support surface of the heat insulating support supporting it are bonded together via an adhesive and a heater for heating and accelerating curing of the adhesive.

Next, this invention will be explained in detail based on the accompanying drawings showing the embodiments thereof.

In FIGS. 1 and 2, members that are the same as or similar to those shown in FIG. 3 are given the same reference numerals.

That is, 1 is a low-temperature fluid transport pipe, 2 is a low-temperature insulation material applied to the outer peripheral surface of the pipe, and 3 is a frame.

Reference numeral 10 denotes a heat insulating support for low-temperature piping that supports the pipe, and includes a main part 11 of the heat insulating support made of a material with excellent heat insulation and compression resistance, and a circular arc gutter-shaped support supporting the pipe. It has a structure in which a heater member 12 disposed on the upper surface of the heat insulating support main part 11 and a bottom plate 13 that covers the bottom or a part of the bottom and side surfaces of the heat insulating support main part 11 are joined into an integral structure. .

Materials with excellent heat insulating properties and compression resistance that form the main part 11 of the heat insulating support include wood materials such as cypress wood, synthetic resin foams such as hard urethane foam and phenol foam, calcium silicate-based heat insulating materials, Lightweight concrete-based insulation materials, etc.
They are appropriately selected and used depending on the purpose of use. The main portion 11 of the heat insulating support body is formed by cutting the material into a desired shape, or by foam-molding a synthetic resin foam using a mold having the desired shape. At that time, in the case of synthetic resin foam,
Either line it with a reinforcing material such as glass fiber or glass cloth, which has higher strength and a lower coefficient of linear expansion, or/and combine it into an integral structure by using self-adhesive force on the surface. Good too. By doing so, the strength and toughness can be improved, and the density can be reduced, so that there is an advantage that the heat insulation properties can be improved and the cost can be reduced.

The heater member 12 can be made of any material that has adhesive properties, such as a heating wire, a heating wire supported on glass paper, glass cloth, canvas, cheesecloth, plastic film, etc. A plastic film type heater or the like is preferably used, and its capacity varies depending on usage conditions such as the type of adhesive used to bond the pipe and the heat insulating support 10, the type of adherend, operating temperature, and environmental temperature. To be determined accordingly. The heater member 12 can be formed into an integral structure in advance by using adhesive on the arcuate upper surface of the main part 11 of the heat insulating support body 11, or by forming the main part 11 of the heat insulating support body by foam molding a synthetic resin foam. It is bonded into an integral structure using its self-adhesive force. Note that the heater member 12 is the main part 11 of the heat insulating support body.
It does not need to be provided on the entire upper surface of the

The bottom plate 13 that supports the main support part 11 is preferably made of a corrosion-resistant material such as stainless steel and formed into a flat plate, a U-shaped gutter, an arc-shaped gutter, or a box shape. The bottom surface or part of the bottom surface and side surfaces is covered with adhesive, set screws, and the self-adhesive force of synthetic resin foam, either alone or in combination. A sliding plate (not shown) made of a material having a low friction coefficient and compression resistance may be attached to the outside of the bottom plate 13. By doing this, the frictional resistance at the contact surface between the frame 3 and the heat insulating support 10 can be significantly reduced, so that when the low-temperature pipe expands or contracts due to temperature changes, the pipe and the heat insulating support can be adhesively fixed. The stresses on the tube can be significantly reduced.

The thermosetting adhesive used to bond the heat insulating support 10 to the piping 1 is an adhesive whose main component is a polymer compound that does not produce by-products upon curing, and its uncured composition remains stable at room temperature. Those exhibiting a liquid state are preferably used. Examples of the above-mentioned polymer compounds include polyurethane resins, polyurethane elastomers, epoxy resins, unsaturated polyester resins, epoxy acrylate resins, epoxy urethane resins, and epoxy nitrile resins. That is, starting materials can be found in a wide range, and therefore adhesives having desired properties depending on the purpose of use can be obtained very easily, which is particularly suitable. Thermosetting adhesives are made by blending additives such as diluents, catalysts, softeners, fillers, colorants, flame retardants, etc. as necessary with the above-mentioned main ingredients and curing agents.
It is appropriately blended with a base agent and/or a curing agent that does not interact with each other, and is usually separated into a base composition and a curing agent composition before use. When using this adhesive, a base composition and a curing agent composition are mixed by known means to form an uncured composition;
Within its pot life (30 to 150 minutes), use a spatula or brush.
Using a known means such as a coating machine, apply it to one or both surfaces of the contact surface between the piping that requires insulation and the insulation support (coating amount: 0.1 to 4 kg/m ² ), then combine the two and hold it as it is. Then, as time passes, the uncured composition undergoes a curing reaction, increases in viscosity, and finally becomes a tough polymeric compound that adhesively fixes the two together.

According to the piping heat insulation support device configured as described above, since the heater member is disposed in the uncured composition of the thermosetting adhesive applied to the abutment surface of the pipe and the heat insulation support, the heater member By heating the final cured composition by heating, the curing reaction of the uncured composition can be promoted, and the required strength of the uncured adhesive composition can be developed reliably and in a short time. In addition, since heating can be performed via the heater member, the uncured adhesive composition can be maintained at the required temperature regardless of changes in the adherend material or environmental conditions, and adhesive strength can be maintained stably under any usage conditions. It is possible to achieve highly reliable adhesive fixation, and to simplify quality control. In addition, in the case of the heat insulating support device having the above structure, since the adhesive part with the pipe is strengthened by the heater member, even if the pipe is exposed to low temperature when using the low temperature pipe, the difference in the coefficient of linear expansion between the two will be suppressed. The occurrence of thermal stress caused by this is alleviated, and therefore, it is possible to prevent the occurrence of phenomena that would cause the original function to be lost, such as separation of the two during use or cracking of the heat insulating support.

The above embodiment shows an example of a structure in which the heater member is integrated with the main part of the support body using an adhesive, but when supporting the pipe with the main part of the support body 11,
A heater member is embedded in a layer of adhesive applied to the arcuate gutter-like surface of the support main part 11 and the piping, and the heater heats and accelerates the hardening of the adhesive to connect the support main part and the pipe. It can also be configured to be fixed with adhesive.

Next, further explanation will be given with reference to examples.

Apply an uncured composition of polyurethane adhesive (pot life: 60 minutes) with a trowel to each contact surface between the SUS304 steel plate and the heat insulating support formed from high-density hard urethane foam (density 500Kg/m ³ ). (applying amount 500 g/m ² each), hold the two together so that a nichrome wire with a wire diameter of 0.12 mm is sandwiched between them, and then energize the nichrome wire heater (AC 100 V). 60-70 in the center of the uncured composition
As a result of maintaining the temperature at 0.degree. C., the curing reaction progressed until practical strength was developed 4 hours after electricity was applied.

In addition, in the above example, it took 25 hours for the material that was not heated to develop practical strength.

As described above, in a heat insulating support device for cryogenic piping that supports metal cryogenic piping that transports cryogenic fluid with a heat insulating support made of a material that has heat insulating properties and compression resistance, it is possible to The arcuate gutter-shaped support surface of the heat insulating support that holds and supports the pipe is bonded together through the adhesive and the heater member for heating and curing the adhesive. A heat insulating support device for piping that can reliably develop the required strength in a short period of time can be obtained at a low cost.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway perspective view of a heat insulating support device for piping showing an embodiment of this invention, Fig. 2 is a partially cutaway perspective view of a heat insulating support, and Fig. 3 is a perspective view of a conventional heat insulating support device for pipes. It is a partially cutaway perspective view. 1... Low temperature piping, 2... Low temperature insulation material, 3... Frame, 4... Heat insulation support, 10... Heat insulation support, 1
DESCRIPTION OF SYMBOLS 1... Main part of heat insulating support, 12... Heater member, 1
3...Bottom plate.

Claims (1)

[Scope of utility model registration request] A heat insulating support device for a cryogenic pipe that supports a metal cryogenic pipe that transports cryogenic fluid with a heat insulating support made of a material that has heat insulation properties and compression resistance, includes a cryogenic pipe and a heat insulating support that supports it. 1. A heat insulating support device for low-temperature piping, characterized in that an arcuate gutter-shaped support surface is integrally bonded via an adhesive and a heater member for promoting heat curing of the adhesive.