KR100509108B1 - method for coating inner surface of tube - Google Patents

method for coating inner surface of tube Download PDF

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Publication number
KR100509108B1
KR100509108B1 KR10-2003-0000590A KR20030000590A KR100509108B1 KR 100509108 B1 KR100509108 B1 KR 100509108B1 KR 20030000590 A KR20030000590 A KR 20030000590A KR 100509108 B1 KR100509108 B1 KR 100509108B1
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South Korea
Prior art keywords
tube
coating
winding
string
pipe
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KR10-2003-0000590A
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Korean (ko)
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KR20040063241A (en
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강신규
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강신규
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Priority to KR10-2003-0000590A priority Critical patent/KR100509108B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/30—Processes for applying liquids or other fluent materials performed by gravity only, i.e. flow coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/002—Pretreatement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/005—Repairing damaged coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
    • B05D7/222—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes of pipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2254/00—Tubes
    • B05D2254/04—Applying the material on the interior of the tube

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

본 발명은 코팅될 관에 대한 준비공정이 완료된 관의 내면에 코팅을 수행하는 방법에 관한 것으로서, 관(1)의 길이, 관의 내경, 코팅두께 등에 근거한 코팅에 필요될 코팅제(3)인 수지량의 체적에 상당하는 구획된 공간을 상기 관내의 상부에 형성시키도록, 상기 관(1)의 상부 부근에 외력에 의해 슬라이드 가능하게 피그(2)를 삽입하는 단계, 상기 구획된 공간에 코팅제(3)를 충전시키는 단계, 그리고 상기 충전된 코팅제(3)가 자연낙하하는 속도와 동일한 속도로 상기 권취/해권기(6)에 의해 줄(4)을 당기는 단계를 포함하고 있으며, 여기에서, 상기 피그(2)는 상기 줄(4)의 일단에 연결해제가능하게 연결되어 있고, 상기 줄의 타단은 아일들 롤러(5)를 경유하여 권취/해권기(6)에 연결되어 있으며, 상기 권취/해권기(6)는 상기 줄의 권취속도를 조절하여 세팅할 수 있는 제어장치가 구비되어 있는 것으로 되어 있다.The present invention relates to a method for performing a coating on an inner surface of a tube in which a preparation process for a tube to be coated is completed, wherein the resin is a coating agent (3) required for coating based on the length of the tube (1), the inner diameter of the tube, the coating thickness, and the like. Inserting the pigment 2 slidably by an external force in the vicinity of the upper part of the tube 1 so as to form a partitioned space corresponding to an amount of volume in the upper part of the tube, 3) filling and pulling the string 4 by the winding / unwinding machine 6 at the same rate as the filled coating 3 falls naturally, wherein The pig 2 is releasably connected to one end of the cord 4, the other end of the cord is connected to the winding / unwinding machine 6 via an isle roller 5, and the winding / The reciprocator 6 can be set by adjusting the winding speed of the rope. Is that which is provided with a control device.

Description

관의 내면을 코팅하는 방법{method for coating inner surface of tube}Method for coating inner surface of tube

본 발명은 관 내면을 코팅하는 방법에 관한 것이며, 보다 상세하게는 열교환기관 및 각종배관(금속, 비금속관) 내면의 내열, 방식 코팅의 제작 또는 보수 시공에 적용되는 방법에 관한 것이다.The present invention relates to a method for coating the inner surface of the tube, and more particularly to a method applied to the heat resistance of the heat exchanger and the inner surface of the various pipes (metal, non-metallic tube), the production or repair of the anticorrosive coating.

열교환기는 본체인 외관 내에 내관인 다수의 관이 배치되어 있다. 열교환기는 일정 기간 사용하게 되면, 그 관의 내면에 부식방지제인 수지(예를 들면, 에폭시 수지)로 코팅된 코팅부가 벗겨져 관의 내면이 부식되거나 관 내부에 이물질이 존재하게 된다.The heat exchanger is arranged with a plurality of tubes which are inner tubes in the outer body which is the main body. When the heat exchanger is used for a certain period of time, the inner surface of the tube is coated with a resin (for example, an epoxy resin) which is a corrosion inhibitor, so that the inner surface of the tube is corroded or foreign matter is present inside the tube.

이를 위해, 내관인 관을 코팅시키도록 또는 재생시키도록 관의 내면에서 제작시공 또는 보수시공하는 방법이 각종 제안되어져 있다. 이와 같은 제작시공 또는 보수시공 시에는, 먼저, 관내의 청소를 행하고, 샌드 블래스트 등에 의해 관의 내면을 연마하고, 내면의 녹이나 부착물을 제거하고, 에폭시 수지 등의 경화성의 수지를 이용하여 다음과 같은 방식으로 관의 내면에 코팅을 시행하고 있다.To this end, various methods for manufacturing or repairing the inner surface of the tube to coat or regenerate the inner tube are proposed. At the time of such manufacturing or repair work, first, the inside of the pipe is cleaned, the inner surface of the pipe is polished by sand blasting, the rust and deposits on the inner surface are removed, and the curable resin such as epoxy resin is used as follows. In the same way, the inner surface of the tube is coated.

소구경, 장척의 관내면에 수지 등을 코팅 또는 라이닝할 때, 종래에는, 예를 들면, 관면에 액상 코팅제를 출입시키는 침적법, 관을 회전시키면서 액상코팅체를 관내면을 따라 흐르게 하여 코팅하는 회전법 등이 행하여 지고 있으며, 또한 치수에 따라, 스프레이, 솔칠, 인두칠 등과 같은 방법이 가능한 경우가 있지만, 간편하게 그리고 신속하게 균일 코팅층을 형성시키는 방법은 없다.When coating or lining a resin or the like on a small diameter or a long inner tube surface, conventionally, for example, a method of depositing a liquid coating agent in and out of a tube surface, and coating the liquid coating body by flowing along the inner surface while rotating the tube Although a rotating method or the like is performed, and methods such as spraying, brushing, and ironing may be possible depending on the dimensions, there is no method of forming a uniform coating layer simply and quickly.

상기 종래법은, 하기의 결점을 가지고 있다.The said conventional method has the following faults.

1. 균일 두께 코팅층을 얻는 것과 코팅층 두께의 조절이 곤란하다.1. It is difficult to obtain a uniform thickness coating layer and to control the coating layer thickness.

2. 침적법의 경우는 비교적 간단하지만, 잔액을 빼내는 처리에 수고가 들고, 얼룩 등의 결함이 형성되기 쉽다.2. In the case of the immersion method, it is relatively simple, but it takes a lot of work to remove the balance, and defects such as stains are likely to be formed.

3. 솔칠, 인두칠 등의 경우에는 줄무뉘 형상의 얼룩이 형성되기 쉽고, 코팅층 두께 조절도 곤란하다.3. In the case of brushing or iron coating, it is easy to form a stripe-shaped stain, and it is difficult to control the thickness of the coating layer.

또한, 상기 침적법이나 회전법의 경우, 1회의 코팅으로 형성되는 수지층의 두께는 한계가 있고, 고점도 수지로도 소정의 수지층으로 하는 것은 곤란하다. 이것은 1회분의 코팅에서 상당하는 층의 수지층을 형성하도록 하면, 수지의 경화의 과정에서 자연낙하가 생겨, 관내 아래측으로 물방울이 생겨서, 라이닝층 두께가 불균일하게 되므로, 층두께의 균일성이 유지되지 않는다. 이 때문에, 몇회 코팅을 반복하여 소정 두께층을 얻는 것이 가능하지만, 앞서 수지층의 경화을 얻고 나서 코팅을 행하므로, 시간 손실이 크고, 또한, 코팅을 반복하기 때문에 작업성이 좋지 않다. 이 결과 코스트가 높게 되다는 결점이 있다.Moreover, in the case of the said immersion method and the rotation method, the thickness of the resin layer formed by one coating has a limit, and it is difficult to set it as a predetermined resin layer even with high viscosity resin. If a resin layer of a corresponding layer is formed in one coating, a natural fall occurs during the curing of the resin, water droplets are generated in the lower part of the tube, and the thickness of the lining layer becomes uneven, so that the uniformity of the layer thickness is maintained. It doesn't work. For this reason, although a predetermined thickness layer can be obtained by repeating several times of coating, since coating is performed after obtaining the hardening of the resin layer previously, since time loss is large and coating is repeated, workability is not good. As a result, the cost is high.

본 발명은 종래기술의 결점을 해소하기 위해, 직선형 열교환기의 내관인 관이나 각종 직선형 관을 수직으로 배치시킨 상태에서, 상기 관의 상단부에 충전된 코팅제의 자연낙하 속도에 맞추어, 상기 관내의 충전된 코팅제 바로 밑에 배치되어 있는 피그를 하강시킴으로써, 상기 관내에 코팅제를 균일하게 코팅할 수 있는 관의 내면 코팅 방법을 제공하는 것이다.The present invention, in order to solve the drawbacks of the prior art, in the state in which the inner tube of the linear heat exchanger or various linear tubes are arranged vertically, in accordance with the natural dropping rate of the coating agent filled in the upper end of the tube, the filling in the tube It is to provide a method for coating the inner surface of the tube that can be uniformly coated with the coating agent in the tube by lowering the pigs disposed directly below the coated coating.

본 발명은 상기 목적을 달성하기 위해, 제작시공될 또는 보수시공될 열교환기의 내부의 직선형 관 또는 각종의 직선형 관 내면을 코팅하기 전에 상기 관내에 제습 및 가열된 건조공기를 취입하여 상기 관에 존재하는 수분을 제거하고, 연마제가 함유된 압축공기를 상기 관내에 투입하여, 상기 관내의 내면에 붙어 있는 녹이나 이물질을 상기 내면으로부터 분리시키고, 그리고 상기 관내에 압축공기를 취입시켜 관내에 남아 있는 이물질이나 수분을 제거하여, 코팅될 관에 대한 준비공정이 완료된 관의 내면에 코팅을 수행하는 방법에 있어서, 관의 길이, 관의 내경, 코팅두께 등에 근거한 코팅에 필요될 코팅제인 수지량의 체적에 상당하는 구획된 공간을 상기 관내의 상부에 형성시키도록, 상기 관의 상부 부근에 외력에 의해 슬라이드 가능하게 피그를 삽입하는 단계, 상기 구획된 공간에 코팅제를 충전시키는 단계, 그리고 상기 충전된 코팅제가 자연낙하하는 속도와 동일한 속도로 권취/해권기에 의해 줄을 당기는 단계를 포함하고 있으며, 여기에서, 상기 피그는 상기 줄의 일단에 연결해제가능하게 연결되어 있고, 상기 줄의 타단은 아이들 롤러를 경유하여 상기 권취/해권기에 연결되어 있으며, 상기 권취/해권기는 상기 줄의 권취속도를 조절하여 세팅할 수 있는 제어장치가 구비되어 있는 것을 특징으로 하는 관의 내면을 코팅하는 방법으로 되어 있다.In order to achieve the above object, the present invention provides a dehumidified and heated dry air in the tube before coating the inner surface of the linear tube or various linear tubes of the heat exchanger to be manufactured or repaired and present in the tube. Removes moisture, and injects compressed air containing abrasives into the pipe to separate rust or foreign matter adhering to the inner surface of the pipe from the inner surface, and blows compressed air into the pipe so that foreign matter remains in the pipe. In the method of coating the inner surface of the tube where the preparation process for the tube to be coated is completed by removing water or moisture, the volume of the resin amount, which is a coating agent required for coating based on the length of the tube, the inner diameter of the tube, the coating thickness, and the like, is applied. In order to form a corresponding partitioned space in the upper part of the tube, the pigtail is slidably moved by an external force near the upper part of the tube. Incorporating the coating, filling the partitioned space with a coating, and pulling the string by the winding / unwinding machine at the same rate as the filled coating falls freely. It is connected to one end of the string so as to be disconnectable, the other end of the string is connected to the winding / defroster via an idle roller, the winding / decoiler is a control device that can be set by adjusting the winding speed of the string It is a method of coating the inner surface of the tube, characterized in that the provided.

이하, 본 발명에 따른 관의 내면 코팅 방법의 실시예를 구체적으로 설명하면, 다음과 같다. Hereinafter, an embodiment of the inner surface coating method of the tube according to the present invention will be described in detail.

먼저, 제작시공될 또는 보수시공될 직선형 관내를 코팅하기 전에, 관내에 제습 및 가열된 건조공기를 소정된 조건(공기온도; 약 40℃, 공기압력; 1.8㎏/㎠~3.5㎏/㎠, 풍속; 70m/sec~90m/sec)에서 취입하여 상기 관에 존재하는 수분을 제거한다.First, before coating a straight pipe to be manufactured or repaired, the dehumidified and heated dry air in the pipe is subjected to predetermined conditions (air temperature; about 40 ° C., air pressure; 1.8 kg / cm 2 to 3.5 kg / cm 2, wind speed). Blown at 70 m / sec to 90 m / sec) to remove moisture present in the tube.

그 다음, 연마제(그리트 또는 금강사)가 함유된 압축공기를 상기 관내에 소정된 조건(풍속; 40m/sec~90m/sec, 관내부압력; 1.8㎏/㎠~3.5㎏/㎠)에서 투입하여, 관내부압력이 1.8㎏/㎠이 될 때까지 상기 관내면을 연마하여서 상기 관내의 내면에 붙어 있는 녹이나 이물질을 상기 내면으로부터 분리시킨다. 이 때 관 입구에서 관 내부를 눈으로 육안 검사하거나, 관의 내경과 동일한 피그를 상기 관내로 삽입통과시켜 검사하여도 좋은 것은 물론이다.Then, compressed air containing an abrasive (grit or diamond) was introduced into the tube at predetermined conditions (wind speed; 40 m / sec to 90 m / sec, tube internal pressure: 1.8 kg / cm 2 to 3.5 kg / cm 2). The inner surface of the tube is polished until the inner pressure of the tube is 1.8 kg / cm 2 to separate rust or foreign matter from the inner surface of the tube. At this time, the inside of the tube may be visually inspected at the entrance of the tube, or the same pig as the inner diameter of the tube may be inserted into the tube to be inspected.

그 다음, 상기 관내에 2㎏/㎠~3㎏/㎠의 압력과 70m/sec~90m/sec의 풍속을 가진 압축공기를 매회 2~3초의 간격을 갖고서 10초동안 취입시켜 관내에 남아 있는 이물질이나 수분을 제거하여, 코팅될 관에 대한 준비공정을 완료한다.Then, the foreign matter remaining in the pipe by blowing compressed air having a pressure of 2 kg / cm 2 to 3 kg / cm 2 and a wind speed of 70 m / sec to 90 m / sec for 10 seconds at an interval of 2 to 3 seconds each time. Water is removed to complete the preparation process for the tube to be coated.

그 다음, 도 1에 도시된 바와 같이, 열교환기(10)의 코팅될 직선형 관(1)의 길이, 관의 내경, 코팅두께 등에 근거한 코팅에 필요될 코팅제(3)인 수지량의 체적에 상당하는 구획된 공간을 상기 관내의 상부에 형성시키도록, 상기 관의 상부 부근에 외력에 의해 슬라이드 가능하게 피그(pig)(2)를 삽입한다. 여기에서, 상기 피그(2)는 낚시줄과 같은 줄(4)의 일단에 연결해제가능하게 연결되어 있고, 상기 줄의 타단은 아이들 롤러(5)를 경유하여 권취/해권기(6)에 연결되어 있다. 이 권취/해권기(6)는 줄의 권취속도를 조절하여 세팅할 수 있는 제어장치가 구비되어 있다.Next, as shown in FIG. 1, the volume corresponds to the volume of the resin amount, which is the coating agent 3 required for coating based on the length of the straight tube 1 to be coated of the heat exchanger 10, the inner diameter of the tube, the coating thickness, and the like. A pig 2 is slidably inserted by an external force near the upper portion of the tube so as to form a partitioned space at the upper portion of the tube. Here, the pig 2 is releasably connected to one end of the line 4, such as fishing line, the other end of the line is connected to the winding / unwinding machine 6 via the idle roller 5 It is. This winding / unsealing machine 6 is equipped with a control apparatus which can be set by adjusting the winding speed of a string.

상기와 같이 구획된 공간에 코팅제(3)를 충전시킨 상태에서, 상기 충전된 코팅제(3)가 자연낙하하는 속도와 동일한 속도로 상기 권취/해권기(6)에 의해 상기 줄을 당기면, 상기 관(1)에는 상단에서 하단까지 균일한 두께의 코팅층이 형성되게 된다.In the state in which the coating agent 3 is filled in the partitioned space as described above, when the cord is pulled by the winding / unsealing machine 6 at the same speed as the rate at which the filled coating agent 3 naturally falls, the tube In (1), a coating layer having a uniform thickness is formed from the top to the bottom.

만약, 상기 코팅층을 검사하여 상기 코팅층에 핀홀이 형성되어 있으면, 상기 핀홀을 제거하기 위해 상기와 같은 코팅공정을 다시 한번 반복하여도 바람직한 것은 물론이다.If the pinhole is formed in the coating layer by inspecting the coating layer, it is of course preferable to repeat the above coating process once again to remove the pinhole.

상기와 같은 코팅 방법에 의해 직선형의 열교환기의 내관인 직선형 관이나 각종 직선형 관의 내면을 균일하게 그리고 신속하게 코팅제로 도포할 수 있게 되었다.By the coating method as described above, it is possible to uniformly and quickly apply the inner surface of the linear tube or the various linear tubes that are the inner tubes of the linear heat exchanger.

도 1은 본 발명의 실시예에 따라 관의 내면을 코팅하는 장치를 도시한 개략도.1 is a schematic diagram illustrating an apparatus for coating an inner surface of a tube according to an embodiment of the present invention.

Claims (1)

보수시공될 또는 제작시공될 열교환기의 내부의 직선형 관 또는 각종의 직선형 관 내면을 코팅하기 전에 상기 관내에 제습 및 가열된 건조공기를 취입하여 상기 관에 존재하는 수분을 제거하고, 연마제가 함유된 압축공기를 상기 관내에 투입하여, 상기 관내의 내면에 붙어 있는 녹이나 이물질을 상기 내면으로부터 분리시키고, 그리고 상기 관내에 압축공기를 취입시켜 관내에 남아 있는 이물질이나 수분을 제거하여, 코팅될 관에 대한 준비공정이 완료된 관의 내면에 코팅을 수행하는 방법에 있어서,Before coating the inner surface of the straight pipe or various straight pipes of the heat exchanger to be repaired or manufactured, the dehumidified and heated dry air is blown into the pipe to remove moisture present in the pipe, Compressed air is introduced into the tube to remove rust or foreign matter adhering to the inner surface of the tube from the inner surface, and blown compressed air into the tube to remove foreign substances or moisture remaining in the tube, and to the tube to be coated. In the method for performing the coating on the inner surface of the tube is completed for the preparation process, 관(1)의 길이, 관의 내경, 코팅두께 등에 근거한 코팅에 필요될 코팅제(3)인 수지량의 체적에 상당하는 구획된 공간을 상기 관내의 상부에 형성시키도록, 상기 관(1)의 상부 부근에 외력에 의해 슬라이드 가능하게 피그(2)를 삽입하는 단계,Of the tube 1 so as to form a partitioned space on the upper part of the tube corresponding to the volume of the resin amount, which is the coating agent 3 to be used for the coating based on the length of the tube 1, the inner diameter of the tube, the coating thickness, and the like. Inserting the pigtail 2 slidably by an external force near the upper portion, 상기 구획된 공간에 코팅제(3)를 충전시키는 단계, 그리고Filling the partitioned space with a coating agent (3), and 상기 충전된 코팅제(3)가 자연낙하하는 속도와 동일한 속도로 권취/해권기(6)에 의해 줄(4)을 당기는 단계를 포함하고 있으며,And pulling the string 4 by the winding / unwinding machine 6 at the same speed as the filling coating 3 falls naturally, 여기에서, 상기 피그(2)는 상기 줄(4)의 일단에 연결해제가능하게 연결되어 있고, 상기 줄의 타단은 아이들 롤러(5)를 경유하여 상기 권취/해권기(6)에 연결되어 있으며, 상기 권취/해권기(6)는 상기 줄의 권취속도를 조절하여 세팅할 수 있는 제어장치가 구비되어 있는 것을 특징으로 하는 관의 내면을 코팅하는 방법.Here, the pig 2 is releasably connected to one end of the string 4, the other end of the string is connected to the winding / unwinding machine 6 via the idle roller (5) , The winding / unsealing machine (6) is a method for coating the inner surface of the tube, characterized in that it is provided with a control device that can be set by adjusting the winding speed of the rope.
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