The steel sleeve steel insulation pipe is made up of conveying medium, working steel pipe, foam insulation layer and polyethylene plastic external protection pipe, and is sequentially integrated outwardly through the equipment. Polyurethane insulation layer has the functions of waterproof and thermal insulation. It can support the self weight of heat supply network. When the conveying medium temperature is -50 - 120 - C, the steel sleeve steel steam insulation pipe is made of rigid polyurethane urea foam as insulation layer.
Plastic pipe, its role is to protect the polyurethane insulation layer from mechanical damage, the other is anti-corrosion and waterproof.
The steel sleeve steel directly buried insulation pipe is a kind of directly buried prefabricated insulation pipe with good thermal insulation performance, safety and reliability, and low engineering cost. It can effectively solve the problems of heat preservation, sliding lubrication and waterproof of exposed pipe end for 130 ℃ - 600 ℃ high temperature heat transfer in urban central heating. Steel insulated steel pipe not only has the advanced technology and practical performance that traditional trench and overhead laying pipeline can't match, but also has remarkable social and economic benefits, which is also a powerful measure of heating and energy saving.
The steel insulated steel pipe is composed of working steel pipe, insulation layer, rolling guide pipe bracket, outer sleeve (steel pipe) and anti-corrosion layer. The thermal insulation material is bound on the working steel pipe and moves by integral thermal expansion in the outer sleeve supported by the rolling guide pipe. Therefore, the insulation layer is not damaged. The fixed support is built-in fixed support instead of the huge reinforced concrete buttress of the original "three-way fixed support" It is an ideal way to lay steam pipe. After many years of practice and relevant testing centers, the service life can reach more than 30 years.
Hydrophobic composite silicate pipe shell or xn-3 aluminum silicate (moisture-proof ceramic products) insulation pipe shell shall be selected as thermal insulation material for thermal insulation layer, and other materials can also be selected according to customer requirements. The thermal insulation material is bound on the working steel pipe to reduce the heat loss and avoid friction with the steel sleeve, thus prolonging the service life of the insulation layer. The thickness of the insulation layer depends on the temperature of the medium.
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