CN86207500U

CN86207500U - Direct buried insulation tube for resisting corrosion and high temperature

Info

Publication number: CN86207500U
Application number: CN 86207500
Authority: CN
Inventors: 周学禹
Original assignee: Individual
Current assignee: Individual
Priority date: 1986-10-24
Filing date: 1986-10-24
Publication date: 1988-04-13

Abstract

The utility model discloses a direct buried insulation tube which adopts the lacquer of the pipelines of epoxy coal tar or fluorocarbon lacquer as an anticorrosive layer, adopts rigid polyurethane foam plastic and extra-fine glass-wool felts without alkali as heat-insulating materials, and adopts the glass fibre reinforced plastic of chlorosulfonated polyethylene as a protecting layer. The utility model has the advantages of favorable heat-insulating property, low cost, convenient construction, long service life, water prevention, corrosion prevention, and anti-natural weathering. The direct buried insulation tube can be used for the direct buried pipelines of the areas of high underground water levels, and can also be used for pipe ditches and overhead laying.

Description

Direct buried insulation tube for resisting corrosion and high temperature

The utility model belongs to heat supply pipeline equipment.

Since 1954, the pipeline of municipal heating systems or district heating has generally used RPUF to make thermal insulation layer abroad, and plastic bushing is made the direct-burried heat supply pipeline of protective layer.University Of Tianjin has also proposed polyurethane direct-burried heat supply pipeline nineteen eighty-three, has solved the problem that waterproof, corrosion protection and the Wu Gou of direct-burried heat supply pipeline lay, and applies for a patent to Patent Office of the People's Republic of China.Announced with the 85.2.01017 application number." polyurethane " direct-burried heat supply pipeline has following four problems to fail to satisfactorily resolve: 1. pipeline serviceability temperature only limits to the cryotronl below 120 ℃; 2. the cyanogen price of coagulating is higher; 3. it is limited to make the glass fibre reinforced plastics anti-corrosion capacity with unsaturated polyester, and is afraid of solar radiation; 4. because cyanogen coagulates and polyurethane between secure bond together, when the steel pipe occurrence temperature be out of shape, can make thermal insulation layer occur rupturing, make it to lose waterproof and etch-proof ability.

The purpose of this utility model is to provide a kind of temperature limitation that is not subjected to, and strengthens corrosion protection, waterproof, anti-natural weathering, increases toughness, cheap heat supply thermal insulation pipe.

Characteristics of the present utility model are: direct-buried insulated pipe is made up of anticorrosive coat, thermal insulation layer and etch-proof protective layer three parts.Wherein, anticorrosive coat is to adopt the outer wall at metal tube to be coated with epoxide coal bituminous pipe paint of one deck or fluorine carbon lacquer equably, and it has the performance of acid-fast alkali-proof and the variation of heatproof degree, and has antimicrobial corrosion, the advantage of good insulation preformance; Thermal insulation layer adopts RPUF and alkali-free extra-fine glass-wool felt, or alumina silicate, and it has, and thermal conductivity is little, and water absorption rate is little, the advantage of the good and acid-fast alkali-proof of compression and tensile strength; Protective layer be direct-buried insulated pipe directly with extraneous contact segment, adopt chlorosulfonated polyethylene glass fibre reinforced plastics, it has wear-resistant, resistance to compression, waterproof, anti-strong acid and strong base and the etch of salt and the advantage that prevents natural weathering.

Structure of the present utility model is as shown in the figure: Fig. 1 is a low temperature thermal insulation pipe shaft side figure, and Applicable temperature is below 180 ℃, and Fig. 2 is the high temperature heat insulation pipe shaft side figure, and Applicable temperature is more than 180 ℃.Wherein, Fig. 1: 1-steel conduit; The epoxide coal bituminous pipe paint of 2-, and brush one deck pitch (or oil of the cold end) again on its surface; The 3-RPUF; 4-chlorosulfonated polyethylene glass fibre reinforced plastics.Fig. 2: 1-steel conduit; 2-fluorine carbon is painted brush one deck bituminous paint; The 3-RPUF; 4-chlorosulfonated polyethylene glass fibre reinforced plastics; 5-asphalt-bonded glass blanket, or alkali-free extra-fine glass-wool felt, or alumina silicate.

The utility model with heat supply pipeline be divided into 120 ℃, 150 ℃, 180 ℃, 300 ℃, various classifications more than 400 ℃ and 400 ℃.Corrosion-resistant coating and thermal insulation layer should be looked medium temperature and be different.A, when the fed sheet of a media temperature is below 180 ℃ the time, make anticorrosive with epoxide coal bituminous pipe paint, make thermal insulation layer with RPUF, polyurethane the upper limit temperature of heat tolerance is 133 ℃, serviceability temperature is 120 ℃, confirm when temperature surpasses 133 ℃ through test, polyurethane generation carbonization, structure there is no destruction, still plays insulation effect, along with the thickening of increase in temperature carburization zone, temperature is in the time of 180 ℃, carburization zone thickness is 1～1.5 centimeter, and 1.5 centimeters polyurethane foam no changes in addition are so the serviceability temperature limit of RPUF can be brought up to 180 ℃; B, when serviceability temperature is 180 ℃～300 ℃, make corrosion-resistant coating with fluorine carbon lacquer, with the composite heat-insulating layer insulation, composite heat-insulating layer is divided into two-layer: first layer alkali-free extra-fine glass-wool felt, or asphalt-bonded glass blanket, or alumina silicate.The second layer is still made thermal insulation layer with RPUF.Be the difference of composite bed according to the thermal insulation pipe temperature, the number of plies structure of decision composite heat-insulating layer; C, when the fed sheet of a media temperature is more than 400 ℃ or 400 ℃ the time, this pipeline mostly is built on stilts and lays, and can not make corrosion-resistant coating, thermal insulation layer still adopts lamination layer structure; D, between anticorrosive coat and thermal insulation layer, be coated with one deck pitch or oil of the cold end, when pipeline is not worked, this layer plays the anticorrosive effect of waterproof, when pipeline is worked, the temperature oil of the cold end that raises dissolves, make between pipeline and the thermal insulation layer to form one and can make pipeline free, to guarantee not reason pipe deforming and rupturing of thermal insulation layer along the space of stretching.

The anticorrosive paint that the utility model adopts, solidifying better than cyanogen from comprehensive comparison, and also cost is low, makes protective layer with chlorosulfonated polyethylene fiberglass, is that other resistant material is incomparable, and low price. This insulating tube can be in the factory process moulding, and the assembled in situ construction improves speed of application.

The utility model can be widely used in the industrial departments such as national defence, electric power, oil, chemical industry, urban construction, metallurgical heat supply network engineering, underground heat, refrigeration, be applicable to direct-burried underground pipings such as carrying various heating installation, hot water, natural gas, liquefied gas, oil product and other aqueous medium, also can be used as the usefulness of various empty frame pipelines.

Claims

1, a kind of direct-buried insulated pipe of forming by conduit, anticorrosive coat, thermal insulation layer and etch-proof protective layer; it is characterized in that conduit is a steel pipe; the anticorrosive coat of outer wall of steel pipe is made anticorrosive coating with epoxide coal bituminous pipe paint or fluorine carbon lacquer; protective layer used RPUF and alkali-free extra-fine glass-wool felt; or alumina silicate is made thermal insulating material, waterproof, etch-proof protective layer used chlorosulfonated polyethylene glass fibre reinforced plastics.

2,, it is characterized in that said anticorrosive coat is according to the described direct-buried insulated pipe of claim 1: when fed sheet of a media below 180 ℃ the time, make anticorrosive coating with epoxide coal bituminous pipe paint; When fed sheet of a media during, make anticorrosive coating with fluorine carbon lacquer at 180 ℃～300 ℃.

3, according to the described direct-buried insulated pipe of claim 1, it is characterized in that: when fed sheet of a media more than 180 ℃ the time, make thermal insulating material with RPUF; When fed sheet of a media more than 180 ℃ the time, adopt composite heat-insulating layer, first layer alkali-free extra-fine glass-wool felt, or asphalt-bonded glass blanket, or alumina silicate; Second layer RPUF.