WO2010104126A1 - Method of retaining temperature of metal product - Google Patents

Method of retaining temperature of metal product Download PDF

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Publication number
WO2010104126A1
WO2010104126A1 PCT/JP2010/054028 JP2010054028W WO2010104126A1 WO 2010104126 A1 WO2010104126 A1 WO 2010104126A1 JP 2010054028 W JP2010054028 W JP 2010054028W WO 2010104126 A1 WO2010104126 A1 WO 2010104126A1
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WO
WIPO (PCT)
Prior art keywords
spacer
heat insulating
pipe
metal product
insulating material
Prior art date
Application number
PCT/JP2010/054028
Other languages
French (fr)
Japanese (ja)
Inventor
久和 森
幹俊 中田
良雄 井門
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住友化学株式会社
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Publication of WO2010104126A1 publication Critical patent/WO2010104126A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
    • F16L59/06—Arrangements using an air layer or vacuum
    • F16L59/07—Arrangements using an air layer or vacuum the air layer being enclosed by one or more layers of insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
    • F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
    • F16L59/021—Shape or form of insulating materials, with or without coverings integral with the insulating materials comprising a single piece or sleeve, e.g. split sleeve, two half sleeves
    • F16L59/024—Shape or form of insulating materials, with or without coverings integral with the insulating materials comprising a single piece or sleeve, e.g. split sleeve, two half sleeves composed of two half sleeves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
    • F16L59/06—Arrangements using an air layer or vacuum
    • F16L59/075—Arrangements using an air layer or vacuum the air layer or the vacuum being delimited by longitudinal channels distributed around the circumference of a tube
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
    • F16L59/14—Arrangements for the insulation of pipes or pipe systems
    • F16L59/143—Pre-insulated pipes

Definitions

  • the present invention relates to a heat insulation method that suppresses the corrosion of the surface of a metal product to be kept warm. More specifically, the present invention relates to a heat retaining method for retaining heat while suppressing the corrosion of the surface of a metal product when the metal product such as a pipe, container, or device is covered with a heat retaining material.
  • Metal products such as pipes, containers, and equipment that handle high-temperature fluids often cover the surface with a heat insulating material.
  • a heat insulating material When rainwater enters between the metal and the heat insulating material, corrosion of the surface of the metal product is promoted. Even if rainwater does not enter, when the high-temperature fluid stops, condensation is likely to occur on the surface of the metal product, which causes corrosion of the surface of the metal product. Furthermore, if the salt contained in the heat insulating material flows into the environment where the surface of the metal product is exposed, corrosion is further promoted.
  • a heat insulating material is attached after the surface of a metal product is coated with a rust preventive paint, but this method takes time and effort to paint the rust preventive paint, and the workability is poor. Since there is a defect that uniform rust prevention performance cannot be obtained due to uneven coating, etc., a method of using a heat insulating material in which a rust preventive layer containing zinc powder is provided in advance on the surface facing the surface of a metal product is known. (See JP-A-7-269784).
  • An object of the present invention is to provide a metal heat-retaining method having an antirust effect by a simple method.
  • the present inventor has found that when covering metal products such as pipes, containers, equipment, etc. with a molded heat insulating material, the surface of the metal product in contact with the molded heat insulating material is likely to corrode.
  • the present inventors have intensively studied a method for keeping warm while preventing the corrosion of the surface of the metal product, and have arrived at the present invention.
  • the present invention has a first step of arranging a spacer on the surface of a metal product to be kept warm, and a second step of providing a shaped heat insulating material with the spacer sandwiched on the surface of the metal product.
  • This is a method for keeping a metal product warm, in which a space having a predetermined interval is provided between a surface and the molded heat-retaining material.
  • the predetermined interval is preferably 1 to 10 mm.
  • the opposing surface of the spacer and the surface of the metal product have the same shape, and the spacer is disposed at a position corresponding to substantially both ends of the molded heat insulating material.
  • the spacer and the molded heat insulating material are integrally molded, and the first step and the second step are the same step.
  • the spacer is a flexible corrugated plate, and is disposed over substantially the entire region where the molded heat insulating material is disposed.
  • the present invention comprises a step of placing a spacer on the surface of a metal product to be kept warm, and a step of placing a shaped heat insulating material across the spacer on the surface of the metal product, the surface of the metal product and the above.
  • the metal product to be kept warm is not limited, and examples thereof include piping, containers, and equipment. Examples of the material of the metal product include carbon steel and stainless steel. In addition, the metal product to be kept warm may be subjected to a treatment such as painting, plating, or thermal spraying for corrosion prevention.
  • the molded heat insulating material is not limited as long as it has a heat retaining effect, and a molded body made of a material mainly composed of calcium silicate, hard urethane home, glass wool, rock wool or the like is exemplified.
  • the spacer examples include a spacer made of a metal such as stainless steel, a heat resistant resin, or the same material as the molded heat insulating material.
  • examples of the form of the spacer include a ring, a corrugated plate, a (coiled) mat formed of a wire, and the like.
  • a water repellent layer may be provided on the surface of the metal product in contact with the spacer to suppress liquid retention.
  • the water-repellent layer is formed by coating a water-repellent agent to form a coating film, or by fluoroplating resin particles in nickel obtained by electroplating in a nickel plating solution in which a fluororesin sheet or tape or fluororesin particles are dispersed.
  • Water repellent plating containing water, a water repellent film obtained by spraying a wire in which a fluoride pitch is wound with aluminum, and a jute impregnated with asphalt.
  • FIG. 1 is a top perspective view schematically showing the order of steps of the heat retaining method of the first embodiment.
  • the pipe 1 which is a metal product to be kept warm is prepared (St1).
  • two annular spacers 4 are arranged so as to be in close contact with the outer peripheral surface of the pipe 1 (St2).
  • two spacers 4 are arranged in the vicinity of both ends of the region covered with the molded heat insulating material of the pipe 1, but each spacer 4 may be arranged so as to have an appropriate interval.
  • the arrangement position is not particularly limited.
  • the heat insulating material 21 having a semicircular cross section in a direction perpendicular to the longitudinal direction is disposed on the upper surface of the pipe 1 with the spacer 4 interposed therebetween (St3).
  • the molded heat insulating material 22 having a semicircular cross section in the direction perpendicular to the longitudinal direction is disposed on the lower surface of the pipe 1 with the spacer 4 interposed therebetween (St4).
  • the outer peripheral surface of the pipe 1 is covered with a molded heat insulating material 2 (consisting of two molded heat insulating materials 21 and 22).
  • the outer peripheral surface of the molded heat insulating material 2 is further covered with an exterior plate 3, and a drain hole 5 having a diameter of 5 to 10 mm (not shown in FIG. 1) penetrating the exterior material 3 at a lower position when the pipe 1 is used horizontally , See FIG. 3) (St5).
  • this drain hole 5 Through this drain hole 5, the liquid that has entered the exterior material 3 is quickly discharged out of the system, and corrosion of the surface of the pipe 1 is suppressed.
  • FIG. 2 is a cross-sectional view in a direction perpendicular to the longitudinal direction of the pipe 1 covered with the molded heat insulating material 2 of FIG.
  • the predetermined interval L is preferably 1 to 10 mm, more preferably 3 to 10 mm, and further preferably 3 to 5 mm. If the predetermined distance L is less than 1 mm, the distance between the pipe 1 and the molded heat retaining member 2 is small, so that a water film is easily formed, and the outer peripheral surface of the pipe 1 is easily corroded.
  • the predetermined interval L is adjusted by the thickness of the spacer 4. Note that, depending on the material and shape of the spacer 4, bending or the like may occur, and manufacturing errors may occur. Therefore, the spacer 4 having a thickness larger than a desired predetermined interval L is usually selected.
  • FIG. 3 is a longitudinal sectional view of the pipe 1 covered with the molded heat insulating material 2 of FIG. 1, that is, a sectional view taken along line III-III of FIG.
  • a space having a predetermined interval L corresponding to the thickness of the spacer 4 exists between the pipe 1 and the molded heat insulating material 2.
  • the liquid that has entered the space is absorbed by the molded heat insulating material 2 and is finally discharged from the drain hole 5 formed in the exterior material 3 by water circulation by heat in the exterior material 3.
  • the drain hole 5 is formed on the lower side in the vertical direction with respect to the longitudinal direction.
  • the number of the drain holes 5 is not limited and is arranged, for example, every several meters. In the case of vertical piping, it is preferable to dispose a drain hole on the lower side of the elbow exterior material, and in the vertical wall portion of the container or device, it can be provided directly above the heat insulating material receiving ring.
  • salt content may flow out of the molded heat insulating material 2.
  • liquid may enter between the metal product and the molded heat insulating material 2. If the surface of the metal product is exposed to such a liquid or a liquid mixed with salt for a long period of time, it is considered that corrosion of the contact portion is promoted.
  • the space formed between the metal product and the molded heat insulating material 2 prevents the surface of the metal product from being exposed to the liquid for a long time.
  • the cross-sectional shape of the spacer 4 of this embodiment is a rectangular shape. Therefore, the inner peripheral surface of the spacer 4 and the outer peripheral surface of the pipe 1 have the same shape and good adhesion.
  • the spacer 4 can adjust the contact area with the outer peripheral surface of the pipe 1 by adjusting the length in the longitudinal direction. Although it is preferable that the area of the portion where the spacer 4 contacts the outer peripheral surface of the pipe 1 is small, it is necessary to support the molded heat insulating material 2 with certainty, and the material and size of the molded heat insulating material 2 and the spacer 4 are determined. Determined by taking into account. Usually, the total is 5 to 20% of the area of the inner peripheral surface facing the pipe 1 of the molded heat insulating material 2.
  • the shape of the spacer 4 is not limited as long as the pipe 1 and the molded heat insulating material 2 are maintained at a predetermined interval L.
  • the annular spacer 4 having a rectangular cross section is used.
  • the cross sectional shape of the spacer 4 is not limited to a rectangular shape. In addition to the rectangular shape, it can be used even if the cross-sectional shape is a circular, semicircular or triangular spacer, but it is easy to manufacture, easy to install, and to support the molded heat insulating materials 21 and 22 A rectangular shape is preferably used because of its ease of use.
  • the spacer 4 and the molded heat insulating material 2 are configured separately, but a member in which the spacer 4 and the molded heat retaining material 2 are configured integrally may be used.
  • the step of arranging the spacer on the surface of the metal product and the step of arranging the molded heat insulating material with the spacer interposed therebetween are the same step.
  • FIG. 4 is a cross-sectional view in a direction perpendicular to the longitudinal direction corresponding to FIG. 2 when a spacer 41 having a shape different from the shape shown in FIG. 2 is used.
  • the spacer 41 shown in FIG. 4 has a shape in which concave portions 41a are regularly formed on the inner peripheral surface.
  • Such a spacer 41 can also be used in the method of the present invention. According to the spacer 41, since the spacer 21 does not come into contact with the pipe 1 in the concave portion 41a, the contact area between the spacer 41a and the pipe 1 is reduced, and the liquid hardly accumulates on the contact surface, contributing to rust prevention.
  • FIG. 5 is a top perspective view schematically showing the order of steps of the heat retaining method of the second embodiment.
  • This embodiment is different from the first embodiment only in the form of the spacer.
  • the pipe 1 which is a metal product to be kept warm is prepared (St1).
  • a flexible corrugated plate spacer 42 in which a corrugated bend is formed is wound around the outer peripheral surface of the pipe 1 (St2).
  • the corrugated ridge line of the corrugated plate is arranged in the longitudinal direction of the pipe 1.
  • the spacer 42 is disposed on substantially the entire outer peripheral surface of the covering region of the pipe 1.
  • the spacer 42 may be fastened with a band (not shown) after being wound around the pipe 1.
  • the molded heat insulating material 21 having a semicircular cross section in the direction perpendicular to the longitudinal direction is arranged on the upper surface of the pipe 1 with the spacer 42 interposed therebetween (St3).
  • the molded heat insulating material 22 having a semicircular cross section in the direction perpendicular to the longitudinal direction is disposed on the lower surface of the pipe 1 with the spacer 42 interposed therebetween (St4).
  • the outer peripheral surface of the pipe 1 is covered with a molded heat insulating material 2 (consisting of two molded heat insulating materials 21 and 22).
  • the outer peripheral surface of the molded heat insulating material 2 is further covered with an exterior plate 3, and water is drained with a diameter of 5 to 10 mm that penetrates the outer material 3, the molded heat retaining material 2, and the spacer 42 at a lower position when the pipe 1 is used horizontally. It is preferable to provide the tube 51 (St5).
  • the liquid that has entered between the outer peripheral surface of the pipe 1 and the spacer 42 is quickly discharged out of the system through the drain pipe 51, and corrosion of the outer peripheral surface of the pipe 1 is suppressed.
  • only one drain pipe 51 is shown in FIG. 5, in order to minimize the contact portion between the outer peripheral surface of the pipe 1 and the spacer 42, a large number of drain pipes having a large diameter are maintained within a range in which the strength is maintained. It is preferable to arrange the tubes. It should be noted that the water formed on the outer peripheral surface of the pipe 1 or that has entered the water does not adhere to the outer peripheral surface of the pipe 1 and the spacer 42 so that water can be quickly discharged from the drain pipe 51. It is preferable that the contact is such that it can pass through. With such a configuration, the liquid formed on or entering the outer peripheral surface of the pipe 1 travels along the outer peripheral surface of the pipe 1 and is discharged out of the system through the drain pipe 51.
  • FIG. 6 is a cross-sectional view in a direction perpendicular to the longitudinal direction of the pipe 1 covered with the molded heat insulating material 2 of FIG.
  • the predetermined distance L is preferably 1 to 10 mm, more preferably 3 to 10 mm, and further preferably 3 to 5 mm. It is difficult to arrange the corrugated plates so that the predetermined interval L is less than 1 mm.
  • molding heat retention member 2 is small, a water film is easy to be formed and the outer peripheral surface of the piping 1 becomes easy to be corroded.
  • the predetermined interval L is adjusted by the thickness of the spacer 42. Note that, depending on the material and shape of the spacer 42, bending or the like may occur and there may be manufacturing errors. Therefore, the spacer 42 having a thickness larger than a desired predetermined interval L is usually selected.
  • the number of waveforms of the spacers 42 is not limited, and is appropriately set in consideration of the strength of the material to be used.
  • the corrugation bend angle is increased, the contact with the pipe 1 is changed from line contact to surface contact due to wettability in a state in which a water film is formed, and therefore is appropriately selected so as to be appropriate contact.
  • FIG. 7 is a longitudinal sectional view of the pipe 1 covered with the molded heat insulating material 2 of FIG. That is, it is a VII-VII sectional view of FIG. As shown in FIG. 7, a space having a predetermined interval L corresponding to the thickness of the spacer 42 exists between the pipe 1 and the molded heat insulating material 2. The liquid that has entered the space or the liquid formed between the pipe 1 and the molded heat insulating material 2 is discharged from the drain pipe 51.
  • the corrugated spacers are corrugated. Arranged so that the ridgeline is vertical.
  • a corrugated spacer is arrange
  • Example 1 An accelerated corrosion test was performed on the pipe 1 covered with the molded heat insulating material by the same heat retaining method as in the first embodiment except that a member in which the spacer 2 and the molded heat retaining material 2 were integrally formed was used.
  • a carbon steel pipe STPG 370 having a nominal diameter of 50A (outer diameter of 60.5 mm)
  • Calcium silicate heat insulating material (Keical Ace (registered trademark) (manufactured by Nihon Kayal Co., Ltd.), outer diameter 164 mm ⁇ inner diameter 64 mm ⁇ length 370 mm, semi-cylindrical shape) is used as the molded heat insulating materials 21, 22.
  • the inner peripheral surface was shaved so as to have an inner diameter of 76 mm with respect to two middle regions (central region) of the equally divided portions. Both end regions where the inner peripheral surface has not been cut also serve as a spacer.
  • the outer peripheral surface of the pipe 1 was covered with the molded heat insulating materials 21 and 22.
  • the distance between the pipe 1 and the molded heat insulating material 2 was 7.8 mm on average in the central region. Furthermore, a through hole having a diameter of 32 mm was provided in the center of the upper part of the molded heat insulating material 2 to form a liquid injection hole.
  • Absorbent cotton was laid on the pipe 1 below the liquid injection hole to prevent salt powder from falling off, and heated silicon oil was circulated in the pipe 1.
  • the surface temperature of the pipe 1 was about 68 ° C.
  • pure water was periodically dropped from the liquid injection hole and maintained for 10 days. The dropping of pure water was performed for about 115 ml per hour for about 8 hours per day for 5 days out of 10 days.
  • pure water was periodically dropped from the liquid injection hole and salt was sprayed and maintained for 9 days. The pure water was added dropwise for about 98 ml per hour for about 8 hours per day for 7 days out of 9 days. The salt was sprayed for about 1 g per day for 7 days out of 9 days.
  • Example 2 An accelerated corrosion test was performed on the pipe 1 covered with the molded heat insulating material by the heat retention method of the second embodiment.
  • a carbon steel pipe STPG 370 having a nominal diameter of 50A (outer diameter of 60.5 mm)
  • STPG 370 having a nominal diameter of 50A (outer diameter of 60.5 mm)
  • spacer 42 a corrugated plate spacer (material: SUS304, plate thickness: 0.5 mm, length: 400 mm) as shown in FIG. 5 to FIG. 7 is used to cover the entire outer periphery of the pipe 1.
  • the corrugated height was about 5 mm, and the number of corrugations was twelve.
  • Calcium silicate heat insulating material (Keical Ace (registered trademark) (manufactured by Nippon Kayal Co., Ltd.), outer diameter 164 mm ⁇ inner diameter 74 mm ⁇ length 500 mm, semi-cylindrical shape) is used as the molded heat insulating materials 21, 22. It arrange
  • a set of upper and lower calcium silicate heat insulating materials (Keical Ace (registered trademark) (Japan) are provided at the front and rear of the place where the spacer is arranged (center area) (that is, where the spacer is not arranged, both end areas).
  • the outer peripheral surface of the pipe 1 was directly coated using an outer diameter of 164 mm ⁇ an inner diameter of 64 mm ⁇ a length of 500 mm and a semi-cylindrical shape).
  • a through hole having a diameter of 25 mm was provided in the heat insulating material on each upper side of both end regions, one through hole was used as a liquid injection hole, and the other through hole was used for temperature measurement.
  • the heated silicon oil was circulated in the pipe 1.
  • Saline chlorine ion concentration: 100 ppm
  • a thermometer was inserted into the other through hole, and the temperature of the surface of the pipe was measured.
  • the corrosion test was conducted for a total of 21 days. For 12 days, the pipe 1 was continuously added dropwise at about 40 ml / hr for about 8 hours a day while directly heating the pipe 1 (temperature is about 75 to 77 ° C.). Otherwise, the saline solution was not dripped, and the heating of the pipe 1 was stopped and left standing.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Insulation (AREA)

Abstract

A method of retaining the temperature of metal, simple and provided with a rust preventing effect. A method of retaining the temperature of a metal product, the method being provided with a first step for disposing spacers (4) on the surface of a metal product (1), the temperature of which is to be retained, and also with a second step for providing a shaped temperature retaining material (2) on the surface of the metal product (1) with the spacers (4) therebetween. A space is provided between the surface of the metal product (1) and the shaped temperature retaining material with a predetermined distance therebetween. Preferably, the predetermined distance is from 1 to 10 mm.

Description

金属製品の保温方法Thermal insulation method for metal products
　本発明は、保温対象の金属製品の表面の腐食を抑制した保温方法に関する。より詳細には、配管、容器、機器等の金属製品を保温材で覆い保温する際に、金属製品の表面の腐食を抑制して保温を行なう保温方法に関する。 The present invention relates to a heat insulation method that suppresses the corrosion of the surface of a metal product to be kept warm. More specifically, the present invention relates to a heat retaining method for retaining heat while suppressing the corrosion of the surface of a metal product when the metal product such as a pipe, container, or device is covered with a heat retaining material.
　高温の流体を扱う配管、容器、機器等の金属製品はその表面を保温材で覆うことが多い。金属と保温材との間に雨水が浸入すると金属製品の表面の腐食を促進させる。また、雨水が浸入しなくても高温の流体が停止したときに金属製品の表面に結露が生じやすく、金属製品の表面の腐食の原因となる。さらに、保温材に含まれる塩分が金属製品の表面が露出している環境に流出すると、腐食を一層促進させる。 金属 Metal products such as pipes, containers, and equipment that handle high-temperature fluids often cover the surface with a heat insulating material. When rainwater enters between the metal and the heat insulating material, corrosion of the surface of the metal product is promoted. Even if rainwater does not enter, when the high-temperature fluid stops, condensation is likely to occur on the surface of the metal product, which causes corrosion of the surface of the metal product. Furthermore, if the salt contained in the heat insulating material flows into the environment where the surface of the metal product is exposed, corrosion is further promoted.
　この腐食を防止するために、金属製品の表面を防錆塗料で塗装した後に保温材を取り付けることが行なわれているが、この方法は防錆塗料の塗装作業に手間がかかり、施工性が悪く、塗布むら等により均一な防錆性能が得られない欠点があることから、予め金属製品の表面に対向する面に亜鉛粉末を含有する防錆剤層を設けた保温材を用いる方法が知られている（特開平７－２６９７８４号公報参照）。 In order to prevent this corrosion, a heat insulating material is attached after the surface of a metal product is coated with a rust preventive paint, but this method takes time and effort to paint the rust preventive paint, and the workability is poor. Since there is a defect that uniform rust prevention performance cannot be obtained due to uneven coating, etc., a method of using a heat insulating material in which a rust preventive layer containing zinc powder is provided in advance on the surface facing the surface of a metal product is known. (See JP-A-7-269784).
特開平７－２６９７８４号公報JP-A-7-269784
　しかしながら、上述の従来の方法は、いずれも防錆塗料の塗布工程が必須であるため、煩雑である。また、高い温度では金属の腐食を持続して防止できない場合がある。本発明は、簡便な方法で、防錆効果を備えた金属の保温方法を提供することを目的とする。 However, any of the conventional methods described above is complicated because an application step of the anticorrosive paint is essential. In addition, metal corrosion may not be continuously prevented at high temperatures. An object of the present invention is to provide a metal heat-retaining method having an antirust effect by a simple method.
　本発明者は、配管、容器、機器等の金属製品を成形保温材で覆い保温を行う場合に、成形保温材と接している金属製品の表面の腐食が進行しやすいことを見出し、このような金属製品の表面の腐食を防止しながら保温を行なう保温方法を鋭意研究し本発明に至った。 The present inventor has found that when covering metal products such as pipes, containers, equipment, etc. with a molded heat insulating material, the surface of the metal product in contact with the molded heat insulating material is likely to corrode. The present inventors have intensively studied a method for keeping warm while preventing the corrosion of the surface of the metal product, and have arrived at the present invention.
　本発明は、保温対象の金属製品の表面にスペーサーを配置する第１工程と、上記金属製品の表面に上記スペーサーを挟んで成形保温材を設ける第２工程と、を有し、上記金属製品の表面と上記成形保温材との間に所定間隔の空間を設ける、金属製品の保温方法である。上記の所定間隔は、好ましくは１～１０ｍｍである。 The present invention has a first step of arranging a spacer on the surface of a metal product to be kept warm, and a second step of providing a shaped heat insulating material with the spacer sandwiched on the surface of the metal product. This is a method for keeping a metal product warm, in which a space having a predetermined interval is provided between a surface and the molded heat-retaining material. The predetermined interval is preferably 1 to 10 mm.
　また、本発明の一形態においては、上記のスペーサーと上記金属製品の表面とは、その対向面が同一形状であり、上記スペーサーは、上記成形保温材の略両端部に対応する位置に配置される。 Further, in one embodiment of the present invention, the opposing surface of the spacer and the surface of the metal product have the same shape, and the spacer is disposed at a position corresponding to substantially both ends of the molded heat insulating material. The
　また、本発明の一形態においては、上記スペーサーと上記成形保温材とが一体に成形されており、第１工程と第２工程とが同一工程である。 In one embodiment of the present invention, the spacer and the molded heat insulating material are integrally molded, and the first step and the second step are the same step.
　さらに、本発明の他の一形態においては、上記スペーサーは、可撓性の波状板であり、上記成形保温材が配置される領域の略全体に配置される。 Furthermore, in another embodiment of the present invention, the spacer is a flexible corrugated plate, and is disposed over substantially the entire region where the molded heat insulating material is disposed.
　本発明によると、配管、容器、機器等の金属製品を成形保温材で被覆し保温する場合に、金属製品の表面の被覆領域の腐食を簡便な方法で抑制することができる。 According to the present invention, when a metal product such as a pipe, container, or device is covered with a molded heat insulating material and kept warm, corrosion of the coated region on the surface of the metal product can be suppressed by a simple method.
第１の実施形態の保温方法の工程順を模式的に示す上面斜視図である。It is an upper surface perspective view which shows typically the process order of the heat retention method of 1st Embodiment. 第１の実施形態における配管の長手方向に垂直な方向の断面図である。It is sectional drawing of the direction perpendicular | vertical to the longitudinal direction of piping in 1st Embodiment. 第１の実施形態における配管の長手方向の断面図である。It is sectional drawing of the longitudinal direction of piping in 1st Embodiment. 異なる形状のスペーサーを用いた図２に対応する断面図である。It is sectional drawing corresponding to FIG. 2 using the spacer of a different shape. 第２の実施形態の保温方法の工程順を模式的に示す上面斜視図である。It is an upper surface perspective view which shows typically the process order of the heat retention method of 2nd Embodiment. 第２の実施形態における配管の長手方向に垂直な方向の断面図である。It is sectional drawing of the direction perpendicular | vertical to the longitudinal direction of piping in 2nd Embodiment. 第２の実施形態における配管の長手方向の断面図である。It is sectional drawing of the longitudinal direction of piping in 2nd Embodiment.
　本発明は、保温対象の金属製品の表面にスペーサーを配置する工程と、当該金属製品の表面に当該スペーサーを挟んで成形保温材を配置する工程と、を有し、上記金属製品の表面と上記成形保温材との間に所定間隔の空間を設ける、金属製品の保温方法である。 The present invention comprises a step of placing a spacer on the surface of a metal product to be kept warm, and a step of placing a shaped heat insulating material across the spacer on the surface of the metal product, the surface of the metal product and the above This is a method for keeping a metal product warm, in which a space with a predetermined interval is provided between the molded heat-retaining material.
　保温対象の金属製品としては、限定されることはなく、配管、容器、機器などが例示される。金属製品の材質としては、炭素鋼、ステンレス鋼などが例示される。また、保温対象の金属製品は、防食のため塗装、メッキ、または溶射などの処理が施されているものであってもよい。 The metal product to be kept warm is not limited, and examples thereof include piping, containers, and equipment. Examples of the material of the metal product include carbon steel and stainless steel. In addition, the metal product to be kept warm may be subjected to a treatment such as painting, plating, or thermal spraying for corrosion prevention.
　成形保温材としては、保温効果を有するものであれば限定されることなく、ケイ酸カルシウム、硬質ウレタンホーム、ガラスウール、ロックウールなどを主成分とする材質からなる成形体が例示される。 The molded heat insulating material is not limited as long as it has a heat retaining effect, and a molded body made of a material mainly composed of calcium silicate, hard urethane home, glass wool, rock wool or the like is exemplified.
　スペーサーとしては、ステンレス鋼などの金属、耐熱性の樹脂、または成形保温材と同じ材料から形成されたスペーサーが例示される。また、スペーサーの形態としては、円環、波状板、針金で形成された（コイル状）マットなどが例示される。 Examples of the spacer include a spacer made of a metal such as stainless steel, a heat resistant resin, or the same material as the molded heat insulating material. In addition, examples of the form of the spacer include a ring, a corrugated plate, a (coiled) mat formed of a wire, and the like.
　金属製品の表面のスペーサーとの接触面には、液体の滞留を抑制するために、撥水層を設けてもよい。撥水層は、撥水剤を塗布して塗膜を形成したり、フッ素樹脂のシートやテープ、フッ素樹脂粒子を分散させたニッケルメッキ液中で電気メッキして得られるニッケル中にフッ素樹脂粒子が含まれる撥水性メッキ、フッ化ピッチをアルミニウムで巻いた線材を容射して得られる撥水性皮膜、さらにはジュートにアスファルトを含浸させたものなどが例示される。この他、デンゾーホットラインテープ（英国ウィンアンドコールス社製防食材）等を用いてもよい。なお、スペーサーの金属製品との接触面に撥水層を設けてもよい。 A water repellent layer may be provided on the surface of the metal product in contact with the spacer to suppress liquid retention. The water-repellent layer is formed by coating a water-repellent agent to form a coating film, or by fluoroplating resin particles in nickel obtained by electroplating in a nickel plating solution in which a fluororesin sheet or tape or fluororesin particles are dispersed. Water repellent plating containing water, a water repellent film obtained by spraying a wire in which a fluoride pitch is wound with aluminum, and a jute impregnated with asphalt. In addition, you may use a Denzo hotline tape (Anticorrosion material by Win & Coals UK). In addition, you may provide a water-repellent layer in the contact surface with the metal product of a spacer.
　以下、実施形態に基づき、本発明をより詳細に説明する。
　（第１の実施形態）
　図１は、第１の実施形態の保温方法の工程順を模式的に示す上面斜視図である。まず、保温対象の金属製品である配管１を準備する（Ｓｔ１）。次に、配管１の外周表面に密着するように円環状のスペーサー４を二つ配置する（Ｓｔ２）。図１では、配管１の成形保温材により被覆される領域の両端近傍に二つのスペーサー４を配置しているが、各スペーサー４は適当な間隔を有するように配置すればよく、スペーサー４の個数、配置位置などは特に限定されない。 Hereinafter, based on an embodiment, the present invention is explained in detail.
(First embodiment)
FIG. 1 is a top perspective view schematically showing the order of steps of the heat retaining method of the first embodiment. First, the pipe 1 which is a metal product to be kept warm is prepared (St1). Next, two annular spacers 4 are arranged so as to be in close contact with the outer peripheral surface of the pipe 1 (St2). In FIG. 1, two spacers 4 are arranged in the vicinity of both ends of the region covered with the molded heat insulating material of the pipe 1, but each spacer 4 may be arranged so as to have an appropriate interval. The arrangement position is not particularly limited.
　次に長手方向に垂直な方向の断面が半円弧状の成形保温材２１を配管１の上部表面上にスペーサー４を挟んで配置する（Ｓｔ３）。そして、同様に、長手方向に垂直な方向の断面が半円弧状の成形保温材２２を配管１の下部表面上にスペーサー４を挟んで配置する（Ｓｔ４）。 Next, the heat insulating material 21 having a semicircular cross section in a direction perpendicular to the longitudinal direction is disposed on the upper surface of the pipe 1 with the spacer 4 interposed therebetween (St3). Similarly, the molded heat insulating material 22 having a semicircular cross section in the direction perpendicular to the longitudinal direction is disposed on the lower surface of the pipe 1 with the spacer 4 interposed therebetween (St4).
　以上の工程を経て、配管１の外周表面が成形保温材２（二つの成形保温材２１，２２からなる）で被覆される。成形保温材２の外周面を、さらに外装板３で被覆し、配管１の水平使用時に下方となる位置に、外装材３を貫通する直径５～１０ｍｍの水抜き孔５（図１では不図示、図３参照）を設けるのが好ましい（Ｓｔ５）。この水抜き孔５を通して、外装材３内に浸入した液体は速やかに系外へ排出され、配管１の表面の腐食が抑制される。 Through the above steps, the outer peripheral surface of the pipe 1 is covered with a molded heat insulating material 2 (consisting of two molded heat insulating materials 21 and 22). The outer peripheral surface of the molded heat insulating material 2 is further covered with an exterior plate 3, and a drain hole 5 having a diameter of 5 to 10 mm (not shown in FIG. 1) penetrating the exterior material 3 at a lower position when the pipe 1 is used horizontally , See FIG. 3) (St5). Through this drain hole 5, the liquid that has entered the exterior material 3 is quickly discharged out of the system, and corrosion of the surface of the pipe 1 is suppressed.
　図２は、図１の成形保温材２で被覆された配管１の長手方向に垂直な方向の断面図である。成形保温材２と配管１との間には、スペーサー４の厚み分の所定間隔Ｌがある。所定間隔Ｌは、好ましくは１～１０ｍｍ、より好ましくは３～１０ｍｍ、さらに好ましくは３～５ｍｍである。所定間隔Ｌが１ｍｍ未満であると、配管１と成形保温部材２の間隔が小さいために水膜が形成されやすく、配管１の外周表面が腐食されやすくなる。一方、所定間隔Ｌが１０ｍｍより大きいと、成形保温材２が大きくなりすぎて経済的ではない。所定間隔Ｌは、スペーサー４の厚みにより調節する。なお、スペーサー４の材質、形状によっては撓みなどが起こり、また製造誤差などもあるので、通常は所望の所定間隔Ｌより大きい厚みのスペーサー４を選択する。 FIG. 2 is a cross-sectional view in a direction perpendicular to the longitudinal direction of the pipe 1 covered with the molded heat insulating material 2 of FIG. There is a predetermined distance L corresponding to the thickness of the spacer 4 between the molded heat insulating material 2 and the pipe 1. The predetermined interval L is preferably 1 to 10 mm, more preferably 3 to 10 mm, and further preferably 3 to 5 mm. If the predetermined distance L is less than 1 mm, the distance between the pipe 1 and the molded heat retaining member 2 is small, so that a water film is easily formed, and the outer peripheral surface of the pipe 1 is easily corroded. On the other hand, if the predetermined interval L is larger than 10 mm, the molded heat insulating material 2 becomes too large, which is not economical. The predetermined interval L is adjusted by the thickness of the spacer 4. Note that, depending on the material and shape of the spacer 4, bending or the like may occur, and manufacturing errors may occur. Therefore, the spacer 4 having a thickness larger than a desired predetermined interval L is usually selected.
　図３は、図１の成形保温材２で被覆された配管１の長手方向の断面図、すなわち、図２のIII－III断面図である。図３に示すように、配管１と成形保温材２の間には、スペーサー４の厚み分の所定間隔Ｌの空間がある。この空間に浸入した液体は、成形保温材２に吸収され、最終的には外装材３中の熱による水循環により外装材３にあけた水抜き孔５より排出される。本実施形態の配管１は、水平で使用されるため水抜き孔５は長手方向に対して垂直方向の下側に形成される。水抜き孔５の配置個数は限定されることなく、例えば数ｍ毎に配置する。垂直配管の場合は、エルボ外装材の下側に水抜き孔を配置することが好ましく、また容器、機器の垂直壁部では保温材受けリングの直上などに設けることができる。 FIG. 3 is a longitudinal sectional view of the pipe 1 covered with the molded heat insulating material 2 of FIG. 1, that is, a sectional view taken along line III-III of FIG. As shown in FIG. 3, a space having a predetermined interval L corresponding to the thickness of the spacer 4 exists between the pipe 1 and the molded heat insulating material 2. The liquid that has entered the space is absorbed by the molded heat insulating material 2 and is finally discharged from the drain hole 5 formed in the exterior material 3 by water circulation by heat in the exterior material 3. Since the pipe 1 of this embodiment is used horizontally, the drain hole 5 is formed on the lower side in the vertical direction with respect to the longitudinal direction. The number of the drain holes 5 is not limited and is arranged, for example, every several meters. In the case of vertical piping, it is preferable to dispose a drain hole on the lower side of the elbow exterior material, and in the vertical wall portion of the container or device, it can be provided directly above the heat insulating material receiving ring.
　成形保温材２の材質によっては、成形保温材２から塩分が流出することがある。さらに、金属製品と成形保温材２と間に液体が浸入することがある。このような液体、または塩分が混入した液体に金属製品の表面が長期で晒されると、接触部分の腐食が促進されると考えられる。本発明においては、金属製品と成形保温材２の間に形成された空間により、金属製品の表面が液体に長期に晒されることを防止する。 Depending on the material of the molded heat insulating material 2, salt content may flow out of the molded heat insulating material 2. Furthermore, liquid may enter between the metal product and the molded heat insulating material 2. If the surface of the metal product is exposed to such a liquid or a liquid mixed with salt for a long period of time, it is considered that corrosion of the contact portion is promoted. In the present invention, the space formed between the metal product and the molded heat insulating material 2 prevents the surface of the metal product from being exposed to the liquid for a long time.
　図３に示すように、本実施形態のスペーサー４の断面形状は、矩形状である。したがって、スペーサー４の内周表面と配管１の外周表面とは同一形状であり、密着度がよい。スペーサー４は、その長手方向の長さを調節することにより、配管１の外周表面との接触面積を調節することができる。スペーサー４が配管１の外周表面に接触する部分の面積は少ない方が好ましいが、確実に成形保温材２を支持することが必要であり、成形保温材２およびスペーサー４の材質、大きさなどを勘案して決められる。通常、合計で成形保温材２の配管１と対向する内周表面の面積の５～２０％である。 As shown in FIG. 3, the cross-sectional shape of the spacer 4 of this embodiment is a rectangular shape. Therefore, the inner peripheral surface of the spacer 4 and the outer peripheral surface of the pipe 1 have the same shape and good adhesion. The spacer 4 can adjust the contact area with the outer peripheral surface of the pipe 1 by adjusting the length in the longitudinal direction. Although it is preferable that the area of the portion where the spacer 4 contacts the outer peripheral surface of the pipe 1 is small, it is necessary to support the molded heat insulating material 2 with certainty, and the material and size of the molded heat insulating material 2 and the spacer 4 are determined. Determined by taking into account. Usually, the total is 5 to 20% of the area of the inner peripheral surface facing the pipe 1 of the molded heat insulating material 2.
　スペーサー４は、配管１と成形保温材２を所定間隔Ｌに保つものであればその形状は限定されない。上記実施形態においては、円環状で断面矩形状のスペーサー４を用いたが、スペーサー４の断面形状は矩形状に限定されない。矩形状以外にも、断面形状が円形状、半円形状、三角形状のスペーサーであっても使用することができるが、製造の容易さ、取り付けの容易さ、成形保温材２１，２２の支持のし易さなどから、矩形状が好ましく用いられる。 The shape of the spacer 4 is not limited as long as the pipe 1 and the molded heat insulating material 2 are maintained at a predetermined interval L. In the above embodiment, the annular spacer 4 having a rectangular cross section is used. However, the cross sectional shape of the spacer 4 is not limited to a rectangular shape. In addition to the rectangular shape, it can be used even if the cross-sectional shape is a circular, semicircular or triangular spacer, but it is easy to manufacture, easy to install, and to support the molded heat insulating materials 21 and 22 A rectangular shape is preferably used because of its ease of use.
　本実施形態では、スペーサー４と成形保温材２とを別体で構成したが、スペーサー４と成形保温材２が一体で構成されている部材を用いることもできる。この場合、金属製品の表面にスペーサーを配置する工程と、スペーサーを挟んで成形保温材を配置する工程とが同一工程となる。 In the present embodiment, the spacer 4 and the molded heat insulating material 2 are configured separately, but a member in which the spacer 4 and the molded heat retaining material 2 are configured integrally may be used. In this case, the step of arranging the spacer on the surface of the metal product and the step of arranging the molded heat insulating material with the spacer interposed therebetween are the same step.
　図４は、図２に示す形状とは異なる形状のスペーサー４１を用いた場合の、図２に対応する長手方向に垂直な方向の断面図である。図４に示すスペーサー４１は、内周表面に規則的に凹部４１ａが形成されている形状である。このようなスペーサー４１も、本発明の方法に使用することができる。スペーサー４１によると、凹部４１ａではスペーサー２１が配管１と接触しないためにスペーサー４１ａと配管１との接触面積が低減され、接触面で液体が溜まりにくく、防錆に寄与する。 FIG. 4 is a cross-sectional view in a direction perpendicular to the longitudinal direction corresponding to FIG. 2 when a spacer 41 having a shape different from the shape shown in FIG. 2 is used. The spacer 41 shown in FIG. 4 has a shape in which concave portions 41a are regularly formed on the inner peripheral surface. Such a spacer 41 can also be used in the method of the present invention. According to the spacer 41, since the spacer 21 does not come into contact with the pipe 1 in the concave portion 41a, the contact area between the spacer 41a and the pipe 1 is reduced, and the liquid hardly accumulates on the contact surface, contributing to rust prevention.
　（第２の実施形態）
　図５は、第２の実施形態の保温方法の工程順を模式的に示す上面斜視図である。本実施形態は、第１の実施形態とは、スペーサーの形態が異なる点のみ相違する。まず、保温対象の金属製品である配管１を準備する（Ｓｔ１）。次に、波形の折り曲がりが形成された可撓性の波状板のスペーサー４２を配管１の外周表面に巻き付ける（Ｓｔ２）。このとき、波状板の波形の稜線が配管１の長手方向となるように配置される。スペーサー４２は、配管１の被覆領域の外周表面の略全体に配置される。スペーサー４２は、配管１に巻き付けた後、バンド（不図示）で留めるようにしてもよい。 (Second Embodiment)
FIG. 5 is a top perspective view schematically showing the order of steps of the heat retaining method of the second embodiment. This embodiment is different from the first embodiment only in the form of the spacer. First, the pipe 1 which is a metal product to be kept warm is prepared (St1). Next, a flexible corrugated plate spacer 42 in which a corrugated bend is formed is wound around the outer peripheral surface of the pipe 1 (St2). At this time, the corrugated ridge line of the corrugated plate is arranged in the longitudinal direction of the pipe 1. The spacer 42 is disposed on substantially the entire outer peripheral surface of the covering region of the pipe 1. The spacer 42 may be fastened with a band (not shown) after being wound around the pipe 1.
　次に長手方向に垂直な方向の断面形状が半円弧状の成形保温材２１を配管１の上部表面上にスペーサー４２を挟んで配置する（Ｓｔ３）。そして、同様に、長手方向に垂直な方向の断面形状が半円弧状の成形保温材２２を配管１の下部表面上にスペーサー４２を挟んで配置する（Ｓｔ４）。 Next, the molded heat insulating material 21 having a semicircular cross section in the direction perpendicular to the longitudinal direction is arranged on the upper surface of the pipe 1 with the spacer 42 interposed therebetween (St3). Similarly, the molded heat insulating material 22 having a semicircular cross section in the direction perpendicular to the longitudinal direction is disposed on the lower surface of the pipe 1 with the spacer 42 interposed therebetween (St4).
　以上の工程を経て、配管１の外周表面が成形保温材２（二つの成形保温材２１，２２からなる）で被覆される。成形保温材２の外周面を、さらに外装板３で被覆し、配管１の水平使用時に下方となる位置に、外装材３、成形保温材２およびスペーサー４２を貫通する直径５～１０ｍｍの水抜き管５１を設けるのが好ましい（Ｓｔ５）。 Through the above steps, the outer peripheral surface of the pipe 1 is covered with a molded heat insulating material 2 (consisting of two molded heat insulating materials 21 and 22). The outer peripheral surface of the molded heat insulating material 2 is further covered with an exterior plate 3, and water is drained with a diameter of 5 to 10 mm that penetrates the outer material 3, the molded heat retaining material 2, and the spacer 42 at a lower position when the pipe 1 is used horizontally. It is preferable to provide the tube 51 (St5).
　水抜き管５１を通して、配管１の外周表面とスペーサー４２の間に浸入した液体は速やかに系外へ排出され、配管１の外周表面の腐食を抑制する。図５においては、一つの水抜き管５１のみ示したが、配管１の外周表面とスペーサー４２との接触部分をできるだけ少なくするために、強度が維持される範囲で、大きな直径の多数の水抜き管を配置することが好ましい。なお、配管１の外周表面に形成された、または浸入した液体が、水抜き管５１から速やかに排出されるように、配管１の外周表面とスペーサー４２との間は密着せずに、水が通過できる程度の接触であることが好ましい。このような構成であることにより、配管１の外周表面に形成された、または浸入した液体は配管１の外周表面を伝い水抜き管５１より系外へ排出される。 The liquid that has entered between the outer peripheral surface of the pipe 1 and the spacer 42 is quickly discharged out of the system through the drain pipe 51, and corrosion of the outer peripheral surface of the pipe 1 is suppressed. Although only one drain pipe 51 is shown in FIG. 5, in order to minimize the contact portion between the outer peripheral surface of the pipe 1 and the spacer 42, a large number of drain pipes having a large diameter are maintained within a range in which the strength is maintained. It is preferable to arrange the tubes. It should be noted that the water formed on the outer peripheral surface of the pipe 1 or that has entered the water does not adhere to the outer peripheral surface of the pipe 1 and the spacer 42 so that water can be quickly discharged from the drain pipe 51. It is preferable that the contact is such that it can pass through. With such a configuration, the liquid formed on or entering the outer peripheral surface of the pipe 1 travels along the outer peripheral surface of the pipe 1 and is discharged out of the system through the drain pipe 51.
　スペーサー４２によると、成形保温材２との間で生じる配管１の表面の腐食が抑制される。これは、配管１の外周表面とスペーサー４２とが線状に接触し、接触する部分が狭いために、早期に水が蒸発してしまい、腐食が抑制されるものと考えられる。また、スペーサー４２により成形保温材２と配管１の表面との間に空間が形成されるので、水膜が形成されにくく、腐食が進行しにくいと考えられる。 According to the spacer 42, corrosion of the surface of the pipe 1 occurring between the molded heat insulating material 2 is suppressed. This is presumably because the outer peripheral surface of the pipe 1 and the spacer 42 are linearly contacted and the contacted portion is narrow, so that water evaporates early and corrosion is suppressed. Moreover, since a space is formed between the molded heat insulating material 2 and the surface of the pipe 1 by the spacer 42, it is considered that a water film is hardly formed and corrosion does not proceed easily.
　図６は、図５の成形保温材２で被覆された配管１の長手方向に垂直な方向の断面図である。成形保温材２と配管１との間には、スペーサー４２の厚み分の所定間隔Ｌがある。所定間隔Ｌは、好ましくは１～１０ｍｍ、より好ましくは３～１０ｍｍ、さらに好ましくは３～５ｍｍである。所定間隔Ｌが１ｍｍ未満となるように、波状板を配置することは困難である。また、配管１と成形保温部材２の間隔が小さいために水膜が形成されやすく、配管１の外周表面が腐食されやすくなる。一方、所定間隔Ｌが１０ｍｍより大きいと、成形保温材２が大きくなりすぎて経済的ではない。所定間隔Ｌは、スペーサー４２の厚みにより調節する。なお、スペーサー４２の材質、形状によっては撓みなどが起こり、また製造誤差などもあるので、通常は所望の所定間隔Ｌより大きい厚みのスペーサー４２を選択する。 FIG. 6 is a cross-sectional view in a direction perpendicular to the longitudinal direction of the pipe 1 covered with the molded heat insulating material 2 of FIG. There is a predetermined distance L corresponding to the thickness of the spacer 42 between the molded heat insulating material 2 and the pipe 1. The predetermined interval L is preferably 1 to 10 mm, more preferably 3 to 10 mm, and further preferably 3 to 5 mm. It is difficult to arrange the corrugated plates so that the predetermined interval L is less than 1 mm. Moreover, since the space | interval of the piping 1 and the shaping | molding heat retention member 2 is small, a water film is easy to be formed and the outer peripheral surface of the piping 1 becomes easy to be corroded. On the other hand, if the predetermined interval L is larger than 10 mm, the molded heat insulating material 2 becomes too large, which is not economical. The predetermined interval L is adjusted by the thickness of the spacer 42. Note that, depending on the material and shape of the spacer 42, bending or the like may occur and there may be manufacturing errors. Therefore, the spacer 42 having a thickness larger than a desired predetermined interval L is usually selected.
　また、スペーサー４２の波形の数は限定されず、使用する材質の強度等を勘案して適宜設定される。波形の折り曲がり角度は、大きくなると、水膜が形成された状態で、濡れ性により配管１との接触が線接触から面接触となり好ましくないので、適切な接触となるように適宜選択される。 Further, the number of waveforms of the spacers 42 is not limited, and is appropriately set in consideration of the strength of the material to be used. When the corrugation bend angle is increased, the contact with the pipe 1 is changed from line contact to surface contact due to wettability in a state in which a water film is formed, and therefore is appropriately selected so as to be appropriate contact.
　図７は、図５の成形保温材２で被覆された配管１の長手方向の断面図である。すなわち、図６のVII－VII断面図である。図７に示すように、配管１と成形保温材２の間には、スペーサー４２の厚み分の所定間隔Ｌの空間がある。この空間に浸入した液体、あるいは配管１と成形保温材２の間で形成された液体は、水抜き管５１より排出される。 FIG. 7 is a longitudinal sectional view of the pipe 1 covered with the molded heat insulating material 2 of FIG. That is, it is a VII-VII sectional view of FIG. As shown in FIG. 7, a space having a predetermined interval L corresponding to the thickness of the spacer 42 exists between the pipe 1 and the molded heat insulating material 2. The liquid that has entered the space or the liquid formed between the pipe 1 and the molded heat insulating material 2 is discharged from the drain pipe 51.
　本実施形態においては、保温対象の金属製品が水平配管である場合を示したが、保温対象が金属製品である容器、機器の垂直壁部の場合には、波板状のスペーサーは、波形の稜線が垂直となるように配置される。なお、波板状のスペーサーは、金属製品の保温対象領域の略全領域に配置されることが好ましい。 In the present embodiment, the case where the metal product to be kept warm is a horizontal pipe is shown. However, in the case of a container or a vertical wall portion of a device where the heat keep target is a metal product, the corrugated spacers are corrugated. Arranged so that the ridgeline is vertical. In addition, it is preferable that a corrugated spacer is arrange | positioned in the substantially all area | region of the heat retention object area | region of a metal product.
　以下、本発明を実施例を挙げて詳細に説明するが、本発明はこれらに限定されるものではない。 Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited thereto.
　（実施例１）
　スペーサー２と成形保温材２とが一体で構成されている部材を用いた点以外、第１の実施形態と同様の保温方法により成形保温材で被覆した配管１について加速腐食試験を行なった。配管１として炭素鋼管（呼び径５０Ａ（外径６０．５ｍｍ）のＳＴＰＧ３７０）を用いた。成形保温材２１，２２としてケイ酸カルシウム保温材（ケイカルエース（登録商標）（日本ケイカル（株）製）、外径１６４ｍｍ×内径６４ｍｍ×長さ３７０ｍｍで半円筒形状）を用い、長手方向に４等分した内の真ん中の２領域（中央領域）に関して内径７６ｍｍとなるように内周表面を削った。内周表面を削らなかった両端領域は、スペーサーの機能を兼ねる。 (Example 1)
An accelerated corrosion test was performed on the pipe 1 covered with the molded heat insulating material by the same heat retaining method as in the first embodiment except that a member in which the spacer 2 and the molded heat retaining material 2 were integrally formed was used. As the pipe 1, a carbon steel pipe (STPG 370 having a nominal diameter of 50A (outer diameter of 60.5 mm)) was used. Calcium silicate heat insulating material (Keical Ace (registered trademark) (manufactured by Nihon Kayal Co., Ltd.), outer diameter 164 mm × inner diameter 64 mm × length 370 mm, semi-cylindrical shape) is used as the molded heat insulating materials 21, 22. The inner peripheral surface was shaved so as to have an inner diameter of 76 mm with respect to two middle regions (central region) of the equally divided portions. Both end regions where the inner peripheral surface has not been cut also serve as a spacer.
　第１の実施形態の方法にしたがって、配管１の外周表面を成形保温材２１，２２で被覆した。配管１と成形保温材２との間の間隔は、中央領域について平均７．８ｍｍであった。さらに、成形保温材２の上部の中央に直径３２ｍｍの貫通孔を設け液体注入孔とした。 According to the method of the first embodiment, the outer peripheral surface of the pipe 1 was covered with the molded heat insulating materials 21 and 22. The distance between the pipe 1 and the molded heat insulating material 2 was 7.8 mm on average in the central region. Furthermore, a through hole having a diameter of 32 mm was provided in the center of the upper part of the molded heat insulating material 2 to form a liquid injection hole.
　液体注入孔の下の配管１に、塩粉末脱落防止用に脱脂綿を敷き、配管１内に加熱したシリコンオイルを循環させた。配管１の表面温度は約６８℃であった。
（１）まず、液体注入孔から定期的に純水を滴下して１０日間維持した。なお、純水の滴下は、１０日間のうち５日間、１日に約８時間、１時間に約１１５ｍｌ行った。
（２）次に、同様に液体注入孔から定期的に純水の滴下および塩の散布をして９日間維持した。なお、純水の滴下は、９日間のうち７日間、１日に約８時間、１時間に約９８ｍｌ行った。塩の散布は９日間のうち７日間、１日に約１ｇ行った。
（３）引き続き、同様に液体注入孔から定期的に純水の滴下および塩の散布をして６日間維持した。なお、純水の滴下は、６日間のうち４日間、１日に約８時間、１時間に約１２８ｍｌ行った。塩の散布は６日間のうち４日間、１日に約１ｇ行った。
（４）更に、同様に液体注入孔から定期的に純水の滴下および塩の散布をして７日間維持した。なお、純水の滴下は、７日間のうち５日間、１日に約８時間、１時間に約１２８ｍｌ行った。塩の散布は７日間のうち５日間、１日に約１ｇ行った。 Absorbent cotton was laid on the pipe 1 below the liquid injection hole to prevent salt powder from falling off, and heated silicon oil was circulated in the pipe 1. The surface temperature of the pipe 1 was about 68 ° C.
(1) First, pure water was periodically dropped from the liquid injection hole and maintained for 10 days. The dropping of pure water was performed for about 115 ml per hour for about 8 hours per day for 5 days out of 10 days.
(2) Next, in the same manner, pure water was periodically dropped from the liquid injection hole and salt was sprayed and maintained for 9 days. The pure water was added dropwise for about 98 ml per hour for about 8 hours per day for 7 days out of 9 days. The salt was sprayed for about 1 g per day for 7 days out of 9 days.
(3) Subsequently, pure water was periodically dropped from the liquid injection hole and salt was sprayed in the same manner, and maintained for 6 days. The dropping of pure water was performed for about 128 hours per hour for about 8 hours per day for 4 days out of 6 days. The salt was sprayed for about 1 g per day for 4 days out of 6 days.
(4) Further, similarly, pure water was periodically dropped from the liquid injection hole and salt was sprayed and maintained for 7 days. The dripping of pure water was performed for about 8 hours per day for about 5 days out of 7 days, and about 128 ml per hour. The salt was sprayed for about 1 g per day for 5 days out of 7 days.
　配管の腐食状況を目視検査した。合計３２日間試験後の結果を表１に示す。 The pipes were visually inspected for corrosion. The results after a total of 32 days are shown in Table 1.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　以上の結果より、配管１と成形保温材２との間隔が平均７．８ｍｍある中央領域は、間隔が平均１．９ｍｍである両端領域と比較して腐食が少なかった。この結果は、塩分をかなりの量添加した加速試験の結果であり、実際の環境下では、平均７．８ｍｍの間隔を設けるとその腐食状況はほとんど問題にならない程度になると推測される。 From the above results, the central region where the distance between the pipe 1 and the molded heat insulating material 2 averaged 7.8 mm was less corroded than the both end regions where the distance was 1.9 mm on the average. This result is the result of an accelerated test in which a considerable amount of salt is added. In an actual environment, if an average interval of 7.8 mm is provided, the corrosion state is assumed to become a problem that hardly becomes a problem.
　（実施例２）
　第２の実施形態の保温方法により成形保温材で被覆した配管１について加速腐食試験を行った。配管１として炭素鋼管（呼び径５０Ａ（外径６０．５ｍｍ）のＳＴＰＧ３７０）を用いた。スペーサー４２として、図５～図７に示すような波状板のスペーサー（材質：SUS304、板厚：０．５ｍｍ、長さ：４００ｍｍ）を用い、これを配管１の外周面の全周を覆うように配置し、SUS304製のバンドで留めた。波形高さ（波状板の厚み）は約５ｍｍ、波形数は１２個であった。 (Example 2)
An accelerated corrosion test was performed on the pipe 1 covered with the molded heat insulating material by the heat retention method of the second embodiment. As the pipe 1, a carbon steel pipe (STPG 370 having a nominal diameter of 50A (outer diameter of 60.5 mm)) was used. As the spacer 42, a corrugated plate spacer (material: SUS304, plate thickness: 0.5 mm, length: 400 mm) as shown in FIG. 5 to FIG. 7 is used to cover the entire outer periphery of the pipe 1. And fastened with a band made of SUS304. The corrugated height (thickness of the corrugated plate) was about 5 mm, and the number of corrugations was twelve.
　成形保温材２１，２２としてケイ酸カルシウム保温材（ケイカルエース（登録商標）（日本ケイカル（株）製）、外径１６４ｍｍ×内径７４ｍｍ×長さ５００ｍｍで半円筒形状）を用い、これをスペーサーを配置した箇所にスペーサーを覆うように配置した。また、スペーサーを配置した箇所（中央領域）の前後の箇所（すなわちスペーサーが配置されていない箇所、両端領域）には、それぞれ上下１セットのケイ酸カルシウム保温材（ケイカルエース（登録商標）（日本ケイカル（株）製）、外径１６４ｍｍ×内径６４ｍｍ×長さ５００ｍｍで半円筒形状）を用いて、配管１の外周表面を直接被覆した。両端領域のそれぞれの上側の保温材に直径２５ｍｍの貫通孔を設けて、一方の貫通孔を液体注入孔とし、もう一方の貫通孔を温度測定に用いた。 Calcium silicate heat insulating material (Keical Ace (registered trademark) (manufactured by Nippon Kayal Co., Ltd.), outer diameter 164 mm × inner diameter 74 mm × length 500 mm, semi-cylindrical shape) is used as the molded heat insulating materials 21, 22. It arrange | positioned so that a spacer might be covered in the arrange | positioned location. In addition, a set of upper and lower calcium silicate heat insulating materials (Keical Ace (registered trademark) (Japan) are provided at the front and rear of the place where the spacer is arranged (center area) (that is, where the spacer is not arranged, both end areas). The outer peripheral surface of the pipe 1 was directly coated using an outer diameter of 164 mm × an inner diameter of 64 mm × a length of 500 mm and a semi-cylindrical shape). A through hole having a diameter of 25 mm was provided in the heat insulating material on each upper side of both end regions, one through hole was used as a liquid injection hole, and the other through hole was used for temperature measurement.
　配管１内に加熱したシリコンオイルを循環させた。一方の貫通孔から食塩水（塩素イオン濃度：１００ｐｐｍ）を滴下し、他方の貫通孔には温度計を差し込み、配管の表面の温度を測定した。 The heated silicon oil was circulated in the pipe 1. Saline (chlorine ion concentration: 100 ppm) was dropped from one through hole, a thermometer was inserted into the other through hole, and the temperature of the surface of the pipe was measured.
　合計２１日間腐食試験を行った。その内の１２日間について、１日に約８時間、配管１を直接加熱（温度は約７５～７７℃）しながら、約４０ｍｌ／ｈｒで連続して滴下した。それ以外は食塩水を滴下せず、配管１の加熱を中止し、放置した。 The corrosion test was conducted for a total of 21 days. For 12 days, the pipe 1 was continuously added dropwise at about 40 ml / hr for about 8 hours a day while directly heating the pipe 1 (temperature is about 75 to 77 ° C.). Otherwise, the saline solution was not dripped, and the heating of the pipe 1 was stopped and left standing.
　試験後、保温材およびスペーサーを外し、配管１の外周表面を目視観察したところ、スペーサーを配置した表面に腐食は見られなかった。 After the test, the heat insulating material and the spacer were removed, and the outer peripheral surface of the pipe 1 was visually observed. As a result, no corrosion was observed on the surface on which the spacer was arranged.
　１　配管、２　成形保温材、３　外装板、４　スペーサー、５　水抜き孔、２１，２２　成形保温材、４１　スペーサー、４２　スペーサー、５１　水抜き管。 1 piping, 2 molded heat insulating material, 3 exterior plate, 4 spacers, 5 drainage holes, 21 and 22 molded thermal insulation materials, 41 spacers, 42 spacers, 51 water draining tubes.

Claims (5)

  1. 　保温対象の金属製品の表面にスペーサーを配置する第１工程と、
    　前記金属製品の表面に前記スペーサーを挟んで成形保温材を配置する第２工程と、を有し、
    　前記金属製品の表面と前記成形保温材との間に所定間隔の空間を設ける、金属製品の保温方法。     A first step of arranging a spacer on the surface of the metal product to be kept warm;
    A second step of disposing a shaped heat insulating material across the spacer on the surface of the metal product,
    A method for keeping a metal product warm, wherein a space having a predetermined interval is provided between the surface of the metal product and the molded heat insulating material.
  2. 　前記所定間隔は１～１０ｍｍである、請求の範囲第１項に記載の金属製品の保温方法。 The method for keeping warm a metal product according to claim 1, wherein the predetermined interval is 1 to 10 mm.
  3. 　前記スペーサーと前記金属製品の表面とは、その対向面が同一形状であり、
    　前記スペーサーは、前記成形保温材の略両端部に対応する位置に配置される、請求の範囲第１項に記載の金属製品の保温方法。     The opposite surface of the spacer and the surface of the metal product have the same shape,
    The metal spacer heat insulation method according to claim 1, wherein the spacer is disposed at a position corresponding to substantially both ends of the molded heat insulation material.
  4. 　前記スペーサーと前記成形保温材とが一体に成形されており、第１工程と第２工程とが同一工程である、請求の範囲第１項に記載の金属製品の保温方法。 The method for keeping warm of a metal product according to claim 1, wherein the spacer and the shaped heat insulating material are integrally formed, and the first step and the second step are the same step.
  5. 　前記スペーサーは、可撓性の波状板であり、前記成形保温材が配置される領域の略全体に配置される、請求の範囲第１項に記載の金属製品の保温方法。 2. The method for keeping warm of a metal product according to claim 1, wherein the spacer is a flexible corrugated plate, and is arranged in substantially the entire region where the shaped heat insulating material is placed.
PCT/JP2010/054028 2009-03-11 2010-03-10 Method of retaining temperature of metal product WO2010104126A1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103234096A (en) * 2013-05-28 2013-08-07 滁州晨润工贸有限公司 Heat insulation plate and production method thereof
JP7501208B2 (en) 2020-07-30 2024-06-18 株式会社ジェイテクト Distribution Pipe

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Publication number Priority date Publication date Assignee Title
JPS5899598A (en) * 1981-12-03 1983-06-13 株式会社　大阪パツキング製造所 Metal coated heat insulating material
JPH10332075A (en) * 1997-06-04 1998-12-15 Mitsubishi Heavy Ind Ltd Piping warm-keeping structure
JP2006125646A (en) * 2004-10-26 2006-05-18 Yazawa Sangyo Kk Heat insulating cover for chimney
JP2009009835A (en) * 2007-06-28 2009-01-15 Japan Pionics Co Ltd Planar heating element

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5899598A (en) * 1981-12-03 1983-06-13 株式会社　大阪パツキング製造所 Metal coated heat insulating material
JPH10332075A (en) * 1997-06-04 1998-12-15 Mitsubishi Heavy Ind Ltd Piping warm-keeping structure
JP2006125646A (en) * 2004-10-26 2006-05-18 Yazawa Sangyo Kk Heat insulating cover for chimney
JP2009009835A (en) * 2007-06-28 2009-01-15 Japan Pionics Co Ltd Planar heating element

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103234096A (en) * 2013-05-28 2013-08-07 滁州晨润工贸有限公司 Heat insulation plate and production method thereof
JP7501208B2 (en) 2020-07-30 2024-06-18 株式会社ジェイテクト Distribution Pipe

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