KR100441497B1 - Ceramic coated insulation pipe in inner surface - Google Patents

Ceramic coated insulation pipe in inner surface Download PDF

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Publication number
KR100441497B1
KR100441497B1 KR10-2002-0003620A KR20020003620A KR100441497B1 KR 100441497 B1 KR100441497 B1 KR 100441497B1 KR 20020003620 A KR20020003620 A KR 20020003620A KR 100441497 B1 KR100441497 B1 KR 100441497B1
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KR
South Korea
Prior art keywords
tube
present
pipe
inner tube
ceramic coated
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KR10-2002-0003620A
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Korean (ko)
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KR20020019492A (en
Inventor
김광수
이갑용
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김광수
이갑용
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Priority to KR10-2002-0003620A priority Critical patent/KR100441497B1/en
Publication of KR20020019492A publication Critical patent/KR20020019492A/en
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Publication of KR100441497B1 publication Critical patent/KR100441497B1/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
    • F16L9/00—Rigid pipes
    • F16L9/18—Double-walled pipes; Multi-channel pipes or pipe assemblies
    • 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
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/14—Coatings characterised by the materials used by ceramic or vitreous materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a general shape other than plane
    • B32B1/08—Tubular products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material

Abstract

본 발명은 단열성을 배가시킴과 동시에 관석 및 결로현상을 억제시킨 내면 세라믹 코팅 이중보온관에 관한 것이다.The present invention relates to an inner surface ceramic coated double insulated tube which doubles the heat insulating property and suppresses the capillarity and condensation phenomenon.

본 발명은 유체를 이송하는 내관과, 상기 내관에 삽입되는 외관과, 상기 내관과 외관 사이에는 경질의 폴리우레탄폼이 발포 충전되고, 상기 내관의 내주면에는 SiO2: 46~47%; Al2O3: 12.0~12.8%; CaCO3: 8.0~8.4%; Fe2O3: 0.5%이하; K20: 1.6%; MgO: 2.1~2.3%; CaO: 7.0~7.8%; Ca(OH)2: 3.3~3.5%; TiO2: 1.5% 이하; Na2O: 1.0% 이하; SO3: 0.4% 이하; (COONa)n-(CH2-CH)n: 12.5~12.7% 및 기타 불가피한 불순물로 이루어진 세라믹 코팅재가 0.5~2.0mm의 두께로 더 코팅되어서 이루어진다.The present invention is characterized in that rigid polyurethane foam is foamed and filled between the inner tube and the outer tube, and between the inner tube and the outer tube, 46 to 47% of SiO 2 is contained in the inner circumferential surface of the inner tube; Al 2 O 3 : 12.0 to 12.8%; CaCO 3: 8.0 ~ 8.4%; Fe 2 O 3 : not more than 0.5%; K 2 O: 1.6%; MgO: 2.1 to 2.3%; CaO: 7.0 to 7.8%; Ca (OH) 2 : 3.3 to 3.5%; TiO 2: 1.5% or less; Na 2 O: not more than 1.0%; SO 3 : not more than 0.4%; (COONa) n- (CH 2 -CH) n : 12.5 to 12.7% and other unavoidable impurities is further coated to a thickness of 0.5 to 2.0 mm.

본 발명에 따르면, 결로방지, 관석억제는 물론 박테리아, 바이러스, 곰팡이 등 세균의 서식을 방지하여 관의 활용도를 높이고, 그 수명을 연장하는 효과를 제공한다.According to the present invention, it is possible to prevent the formation of germs such as bacteria, viruses and fungi, as well as to prevent condensation and to inhibit the growth of capillarity, thereby increasing the utility of the tube and prolonging its service life.

Description

내면 세라믹 코팅 이중보온관{CERAMIC COATED INSULATION PIPE IN INNER SURFACE}{CERAMIC COATED INSULATION PIPE IN INNER SURFACE}

본 발명은 물, 온수, 증기, 기름 등 온도변화에 민감한 유체를 이송하는 배관계통에 사용되는 관의 내관과 외관 사이에 경질의 폴리우레탄폼을 일정압력으로 발포하여 단열성을 배가시킴과 동시에 내관의 내면에는 세라믹 코팅재를 도포시켜 관석 및 결로현상을 억제시킨 내면 세라믹 코팅 이중보온관에 관한 것이다.The present invention relates to a method for expanding a heat insulating property by foaming a rigid polyurethane foam at a constant pressure between an inner pipe and an outer pipe of a pipe used for piping system for transferring a fluid sensitive to temperature change such as water, hot water, steam, oil, The present invention relates to an inner surface ceramic coated double insulated tube which is coated with a ceramic coating material on the inner surface thereof to suppress a capillarity and condensation phenomenon.

일반적으로, 관(파이프)은 부정형의 유체를 이송시키는 안내부재이다.Generally, a pipe (pipe) is a guide member for conveying an irregular fluid.

이러한 관에는 그 재질에 따라 강관, 동관, 주철관 및 수지(플라스틱)관으로 대별되며, 고온의 유체를 이송시킬 때에는주로 강관이 사용되고 이송대상물의 온도범위에 따라 동관, 주철관, 수지관 등이 사용된다.Such pipes are generally divided into steel pipes, copper pipes, cast iron pipes and resin (plastic) pipes according to their materials. In transferring high temperature fluids, steel pipes are mainly used and copper pipes, cast iron pipes and resin pipes are used depending on the temperature range of the conveying objects .

특히, 냉수, 온수, 증기, 기름 등 온도변화에 민감한 유체를 이송시킬 때에는 방청, 방식, 보온, 보냉 등의 성능이 우수한 재질의 관을 사용하여야만 내구성의 증대 및 이송대상 유체의 물성을 보존할 수 있다.In particular, when transporting fluids sensitive to temperature changes such as cold water, hot water, steam, and oil, it is necessary to use pipes of excellent performance such as rustproofing, method, warming, and cold storage to increase the durability and preserve the physical properties of the fluid to be transferred have.

기존에는 관의 외면에 방청도장을 실시하여 녹발생을 방지하고자 하였으나 결로현상에 의해 방청도장의 효과를 충분히 달성할 수 없었고, 또한 보냉을 위해 관 배설시에 보온재를 이용하여 별도의 동파방지작업을 수행하여야 하는 불편함이 있었다.Conventionally, it was tried to prevent rust by applying anti-rust coating on the outer surface of the pipe. However, the effect of anti-rust coating could not be sufficiently achieved due to the condensation phenomenon. Also, There was an inconvenience to perform.

특히, 내관과 외관의 두개의 관으로 된 이중보온관의 경우에는 내관과 외관 사이에 경질의 폴리우레탄 재질로 된 보온재만을 발포충전하여 관의 보온성, 즉 단열성의 향상을 도모하고 있었다.In particular, in the case of a double insulated tube having two tubes of an inner tube and an outer tube, only a heat insulating material made of a rigid polyurethane material is filled between the inner tube and the outer tube to improve the thermal insulation of the tube.

그러나, 이와 같은 관 내부에 생기는 관석(SCALE)을 효과있게 제거할 수 있는 방법이 없어 관의 수명이 짧다는 단점을 해결하지는 못하였다.However, since there is no effective way to remove the scales generated inside the tube, it has not solved the drawback that the life of the tube is short.

본 발명은 상술한 바와 같은 종래 기술이 갖는 제반 문제점을 감안하여 이를 해결하고자 창출한 것으로, 보온재의 두께는 대폭 감소시키되 단열성능은 현저히 향상되도록 하여 배관의 작업성을 개선하고 고온에서도 충분히 사용가능하며 생산원가도 절감시킬 수 있으면서 관석을 억제하고 세균의 서식을 방지하여 관의 수명연장은 물론 그 활용도를 극대화시킨 내면 세라믹 코팅 이중보온관을 제공함에 그 목적이 있다.SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and it is an object of the present invention to provide a method for manufacturing a heat insulating material, which can significantly reduce the thickness of a heat insulating material, The object of the present invention is to provide a double insulated tube with an inner surface ceramic coating which can reduce production costs and inhibit the formation of germs and inhibit the formation of germs, thereby maximizing the life of the tube.

도 1은 본 발명에 따른 세라믹 코팅 이중보온관의 외관 사시도,1 is an external perspective view of a ceramic coated double insulated tube according to the present invention,

도 2는 본 발명에 따른 세라믹 코팅 이중보온관의 측단면도.2 is a side cross-sectional view of a ceramic coated double insulated tube according to the present invention.

* 도면의 주요 부분에 대한 부호의 설명 *Description of the Related Art [0002]

10 : 내관 30 : 폴리우레탄폼10: inner pipe 30: polyurethane foam

40 : 외관 50 : 세라믹 코팅재40: Appearance 50: Ceramic coating material

본 발명의 상기한 목적은 유체를 이송하는 내관과, 상기 내관에 삽입되는 외관과, 상기 내관과 외관 사이에는 경질의 폴리우레탄폼이 발포충전되고, 상기 내관의 내주면에는 SiO2: 46~47%; Al2O3: 12.0~12.8%; CaCO3: 8.0~8.4%; Fe2O3: 0.5%이하; K20: 1.6%; MgO: 2.1~2.3%; CaO: 7.0~7.8%; Ca(OH)2: 3.3~3.5%; TiO2: 1.5% 이하; Na2O: 1.0% 이하; SO3: 0.4% 이하; (COONa)n-(CH2-CH)n: 12.5~12.7% 및 기타 불가피한 불순물로 이루어진 세라믹 코팅재가 0.5~2.0mm의 두께로 더 코팅되어서 이루어진 것을 특징으로 하는 내면 세라믹 코팅 이중보온관을 제공함에 의해 달성된다.The above object of the invention between for conveying the fluid inner tube and exterior that is inserted into the inner pipe and the inner pipe and the appearance is polyurethane foam of the rigid and filled foam, the inner peripheral surface of the inner tube SiO 2: 46 ~ 47% ; Al 2 O 3 : 12.0 to 12.8%; CaCO 3: 8.0 ~ 8.4%; Fe 2 O 3 : not more than 0.5%; K 2 O: 1.6%; MgO: 2.1 to 2.3%; CaO: 7.0 to 7.8%; Ca (OH) 2 : 3.3 to 3.5%; TiO 2: 1.5% or less; Na 2 O: not more than 1.0%; SO 3 : not more than 0.4%; (COONa) n- (CH 2 -CH) n : 12.5 to 12.7% and other unavoidable impurities is further coated to a thickness of 0.5 to 2.0 mm. Lt; / RTI >

본 발명에서 사용되는 관은 냉수, 온수, 증기, 기름 등 온도변화에 민감한 유체의 배송에 사용되는 관으로써 사용온도범위가 약 -18∼1200℃에서 사용되는 강관, 동관, 주철관을 그 대상으로 한다.The tube used in the present invention is a tube used for the delivery of fluids sensitive to temperature changes such as cold water, hot water, steam, oil and the like, and is a steel pipe, a copper pipe, and a cast iron pipe used at a temperature range of about -18 to 1200 ° C .

본 발명에 따른 관의 외면에 피복재를 코팅하는 방법은 이미 공지된 기술로서, 이를테면 붓이나 로울러로 직접 칠하여 코팅층을 형성한다든지 혹은 노즐에 의한 스프레이 방식으로 할 수 있는 바, 스프레이방식이 특히 바람직하다.The method of coating the outer surface of the tube according to the present invention is well known in the art, for example, by coating directly with a brush or a roller to form a coating layer or by a spray method using a nozzle, and a spraying method is particularly preferable .

이하에서는, 본 발명에 따른 선호된 일 실시예를 첨부도면에 의거하여 보다 상세하게 설명한다.In the following, a preferred embodiment according to the present invention will be described in more detail with reference to the accompanying drawings.

도 1은 본 발명에 따른 내면에 세라믹이 코팅된 이중보온관의 바람직한 일 예를 도시한 외관 사시도이고, 도 2는 본 발명에 따른 이중보온관의 측단면도이다.FIG. 1 is a perspective view showing an example of a double insulated tube coated with a ceramic on the inner surface according to the present invention, and FIG. 2 is a side sectional view of a double insulated tube according to the present invention.

도 1 내지 도 2에 도시된 바와 같이, 본 발명은 유체를 이송하는 통로인 내관(10)이 마련되고, 상기 내관(10)과 거리를 두고 상기 내관(10)이 삽입되는 외관(40)이 구비되며, 상기 내관(10)과 외관(40) 사이에는 폴리우레탄폼(30)이 충전되어서 이루어진 이중보온관의 내관(10) 내주면에 세라믹 코팅재(50)를 일정두께로 도포하여 이루어진다.1 and 2, the present invention includes an inner tube 10, which is a path through which a fluid is transferred, and an outer tube 40 into which the inner tube 10 is inserted at a distance from the inner tube 10 And a ceramic coating material 50 is applied to the inner circumferential surface of the inner tube 10 of the double insulated tube filled with the polyurethane foam 30 between the inner tube 10 and the outer tube 40 to a predetermined thickness.

내관(10)은 그 재질에 따라 구분되는 강관, 동관, 주철관 중에서 선택된 어느 하나이며, 바람직하게는가장 많이 사용되고 있는 강관으로 하여줌이 바람직하다.The inner pipe 10 is any one selected from a steel pipe, a copper pipe and a cast iron pipe which are classified according to the material thereof, and it is preferable that the inner pipe 10 be a steel pipe which is used most preferably.

세라믹 코팅재(50)는 SiO2, Al2O3, CaCO3, Fe2O3, K20, MgO, CaO, Ca(OH)2, TiO2, Na2O, SO3및 (COONa)n-(CH2-CH)n을 주성분으로 하여, 무해성 및 내염해성, 무결로성을 갖도록 조성된다.Ceramic coating material 50 is SiO 2, Al 2 O 3, CaCO 3, Fe 2 O 3, K 2 0, MgO, CaO, Ca (OH) 2, TiO 2, Na 2 O, SO 3 and (COONa) n - (CH 2 -CH) n as a main component, and is formed so as to have harmlessness, salt resistance, and integrity.

그 조성비에 있어, SiO2: 46~47%; Al2O3: 12.0~12.8%; CaCO3: 8.0~8.4%; Fe2O3: 0.5%이하; K20: 1.6%; MgO: 2.1~2.3%; CaO: 7.0~7.8%; Ca(OH)2: 3.3~3.5%; TiO2: 1.5% 이하; Na2O: 1.0% 이하; SO3: 0.4% 이하; (COONa)n-(CH2-CH)n: 12.5~12.7% 및 기타 불가피한 불순물로 조성됨이 바람직하다.SiO 2 : 46 to 47% in the composition ratio; Al 2 O 3 : 12.0 to 12.8%; CaCO 3: 8.0 ~ 8.4%; Fe 2 O 3 : not more than 0.5%; K 2 O: 1.6%; MgO: 2.1 to 2.3%; CaO: 7.0 to 7.8%; Ca (OH) 2 : 3.3 to 3.5%; TiO 2: 1.5% or less; Na 2 O: not more than 1.0%; SO 3 : not more than 0.4%; (COONa) n- (CH 2 -CH) n : 12.5 to 12.7% and other unavoidable impurities.

이와 같은 각 성분의 조성은 세라믹 도장재에서 주로 사용되는 성분으로 그 조성비에 있어 약간의 차이를 보이고 있으나, 그 성분차이에 의한 파급효과는 상당히 크다.The composition of each component is mainly used in the ceramic coating material, and the composition ratio thereof is slightly different, but the effect of the component difference is considerably large.

특히, 본 발명에서는 결로방지 및 관석억제 이외에도 식수를 공급하는 파이프에 적당하도록 SiO2, Al2O3, Fe2O3, K20, Na2O와 같은 황백색 천연합성광물의 성분에 의한 바이러스, 박테리아, 곰팡이 등의 서식을 억제하고; 수중에 존재하는 중금속이온, 유기질이온, 부패 유기질의 악취 등을 흡착하는 기능도 구유하게 된다.In particular, in the present invention, in addition to anti-condensation and Capstone inhibition SiO 2, so as to suitable for a pipe for supplying drinking water Al 2 O 3, Fe 2 O 3, K 2 0, the virus according to the component of the yellow-white natural synthetic minerals, such as Na 2 O , Bacteria, fungi and the like; It also absorbs odor of heavy metal ions, organic ions, and decaying organic substances present in the water.

즉, 상기 황백색 천연합성광물의 성분은 3~25 마이크론의 파장을 갖는 원적외선을 85~95% 정도 방사하는 것으로 알려져 있으므로 이 원적외선은 관을 따라 관류되는 냉수 혹은 온수의 체감온도를 5℃ 정도 향상시킬 뿐만 아니라 바이러스, 박테리아, 곰팡이 등의 세균성 독소를 분해 제거하게 된다.That is, since the component of the yellowish white natural synthetic mineral is known to emit 85 to 95% of far infrared rays having a wavelength of 3 to 25 microns, the far infrared ray improves the sensation temperature of the cold water or hot water flowing through the tube by 5 ° C In addition, bacterial toxins such as viruses, bacteria and fungi are decomposed and removed.

아울러, 상기 세라믹 코팅재(50)는 0.5~2.0mm의 피복두께(T)를 갖고 도포됨이 바람직한 바, 이는 그 도포두께(T)가 0.5mm 이하로 되면 관의 굽힘이나 충격 및 관을 따라 관류되는 고열을 함유한 온수의 영향으로 균열과 박리가 쉽게 유발되므로 최소한 0.5mm 이상 피복되어야 하며; 또한 2.0mm 이상이 되면 피복작업이 용이치 않음은 물론 관경을 대폭 축소시키게 되므로 적당하지 않기 때문이다.It is preferable that the ceramic coating material 50 has a coating thickness T of 0.5 to 2.0 mm. When the coating thickness T is less than 0.5 mm, bending or impact of the tube, The cracks and delamination are easily caused by the influence of the hot water containing the high heat, so that they should be coated at least 0.5 mm or more; In addition, when the diameter is 2.0 mm or more, the coating operation is not only useless, but also the diameter of the pipe is greatly reduced.

아울러, 통상 세라믹의 융점은 1800℃ 정도이므로 내열성, 즉 고온에서 충분히 견딜 수 있다.In addition, since the melting point of ceramics is usually about 1800 ° C, it can withstand heat resistance, that is, it can withstand a high temperature.

피복 과정은 먼저, 내관(10)과 외관(40) 사이에 폴리우레탄폼(30)를 발포충전시킨 상태에서, 상기 내관(10)의 내면에 부착 혹은 고착되어 있는 기름, 흙 등의 이물질들을 제거한 후 완전 건조시킨다.The coating process is performed by first removing foreign substances such as oil and soil adhering or sticking to the inner surface of the inner pipe 10 while filling the polyurethane foam 30 between the inner pipe 10 and the outer pipe 40 And then completely dried.

이 상태에서 세라믹 코팅재(50)를 붓, 로울러 혹은 스프레이 등을 이용하여 피복함으로써 본 발명의 목적을 달성할 수 있게 된다.In this state, the object of the present invention can be achieved by coating the ceramic coating material 50 by using a brush, a roller, a spray or the like.

1차 피복후 재피복시에는 완전히 건조한 상태(약 4~5시간 후)에서 피복하도록 함이 바람직하다.It is preferable that the coating is carried out in a completely dry state (after about 4 to 5 hours) at the time of coating the primary coating.

이상에서 상세히 설명한 바와 같이, 본 발명에 따른 내면 세라믹 코팅 이중보온관은 다음과 같은 효과를 제공한다.As described in detail above, the inner surface ceramic coating double insulated tube according to the present invention provides the following effects.

첫째, 보온재의 두께는 줄어들면서 단열성능은 향상되기 때문에 이중보온관의 부피가 감소되어 시공이 간편하여 작업능률이 현저히 증대되는 장점을 제공한다.First, since the insulation is improved by reducing the thickness of the insulating material, the volume of the double insulating tube is reduced, thereby providing a merit that the work efficiency is remarkably increased due to the simple construction.

둘째, 관의 내면에는 세라믹 코팅재가 피복되어 있어 결로방지는 물론 내염해성에 의한 관석의 부착이 억제되어 관의 수명을 연장하는 장점을 제공한다.Second, since the inner surface of the tube is coated with a ceramic coating material, it is possible to prevent the condensation and to prevent the attachment of the tube by the salt resistance, thereby prolonging the life of the tube.

Claims (1)

유체를 이송하는 내관(10)을 구비하고,And an inner pipe (10) for transferring the fluid, 상기 내관(10)에 삽입되는 외관(40)을 구비하며,And an outer tube (40) inserted into the inner tube (10) 상기 내관(10)과 외관(40) 사이에는 경질의 폴리우레탄폼(30)을 발포 충전하고,A rigid polyurethane foam 30 is foamed and filled between the inner pipe 10 and the outer pipe 40, 상기 내관(10)의 내주면에는 SiO2: 46~47%; Al2O3: 12.0~12.8%; CaCO3: 8.0~8.4%; Fe2O3: 0.5%이하; K20: 1.6%; MgO: 2.1~2.3%; CaO: 7.0~7.8%; Ca(OH)2: 3.3~3.5%; TiO2: 1.5% 이하; Na2O: 1.0% 이하; SO3: 0.4% 이하; (COONa)n-(CH2-CH)n: 12.5~12.7% 및 기타 불가피한 불순물로 이루어진 세라믹 코팅재(50)를 0.5~2.0mm의 두께로 피복하여서 이루어진 것을 특징으로 하는 내면 세라믹 코팅 이중보온관.46 to 47% of SiO 2 is formed on the inner peripheral surface of the inner pipe 10; Al 2 O 3 : 12.0 to 12.8%; CaCO 3: 8.0 ~ 8.4%; Fe 2 O 3 : not more than 0.5%; K 2 O: 1.6%; MgO: 2.1 to 2.3%; CaO: 7.0 to 7.8%; Ca (OH) 2 : 3.3 to 3.5%; TiO 2: 1.5% or less; Na 2 O: not more than 1.0%; SO 3 : not more than 0.4%; (COONa) n- (CH 2 -CH) n : 12.5 to 12.7% and other inevitable impurities is coated to a thickness of 0.5 to 2.0 mm.
KR10-2002-0003620A 2002-01-22 2002-01-22 Ceramic coated insulation pipe in inner surface KR100441497B1 (en)

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KR20090026842A (en) * 2007-09-11 2009-03-16 주식회사 엠티마스타 Steel pipe repair and reinforcement work method
KR101174309B1 (en) * 2011-11-16 2012-08-16 신이피엔씨 주식회사 Insulation pipe with multipipe including nano seramic coating layer, apparatus and method for manufacturing of the insulation pipe with multipipe
KR101174307B1 (en) * 2011-09-01 2012-08-16 신이피엔씨 주식회사 Frame-retardant double insulation pipe, apparatus and method for manufacturing frame-retardant poly ethylen outside pipe

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CN106917918B (en) * 2015-12-28 2019-05-14 中国科学院金属研究所 With silicon carbide ceramic abrasion-proof, the pipeline of erosion lining or pipe fitting and preparation method thereof

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KR20090026842A (en) * 2007-09-11 2009-03-16 주식회사 엠티마스타 Steel pipe repair and reinforcement work method
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KR101174309B1 (en) * 2011-11-16 2012-08-16 신이피엔씨 주식회사 Insulation pipe with multipipe including nano seramic coating layer, apparatus and method for manufacturing of the insulation pipe with multipipe

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