Polyurethane direct buried insulation pipe, steel sleeve, steel insulation pipe

Description :

　　The polyurethane insulation pipe is mainly composed of anti-corrosion steel pipe conveying fluid medium as the working pipe, rigid polyurethane foam material with low thermal conductivity and excellent thermal insulation effect as the thermal insulation layer, high-density polyethylene pipe with high strength, aging resistance, corrosion resistance, sealing, waterproof and leakage resistance and other characteristics as the external protective layer of thermal insulation, and the trinity high-density polyethylene outer protective pipe polyurethane foam prefabricated directly buried insulation pipe produced by advanced high-pressure complete polyurethane mixed foaming equipment has excellent overall performance. The production process strictly implements the shot blasting and rust removal treatment on the surface of steel pipe and the corona treatment process on the internal surface of high-density polyethylene outer protective pipe, thus further improving the overall adhesion performance of plastic sheathed steel insulation pipe, making its thermal pipeline more energy-saving and operating life Longer term. Suitable for insulation pipe networks with conveying media not exceeding 140 ℃, occasional peak temperature not exceeding 150 ℃, and working pressure not exceeding 2.5MPa. The pipe materials comply with the Ministry of Construction's CJ/T114, CJ/T115, and GB/T29047 standards, and refer to the European EN253 (pipeline) and GB/T29046 (pipe fittings) standards.

　　The laying method of the polyurethane insulation pipe series products produced by our company:

　　The laying methods of insulation pipes are mainly divided into two types: underground laying and above ground laying. Underground laying is further divided into trench laying and direct burial laying. Trench laying refers to laying insulation pipes in underground pipe trenches; Direct burial laying refers to burying insulation pipes directly into the soil (direct burial laying methods are divided into compensated direct burial laying methods and uncompensated direct burial laying methods); Ground laying refers to the installation of insulation pipes on independent or truss style supports on the ground, also known as overhead laying.

　　1. Low thermal conductivity:

　　The thermal insulation layer material uses rigid polyurethane foam with excellent thermal insulation performance and extremely low thermal conductivity as the thermal insulation material. According to the user's needs, it can provide fluorine free all water environmental friendly foam. This product not only has low thermal conductivity, good mechanical performance, high long-term heat resistance, but also has excellent thermal insulation performance. When 130 ℃ high temperature water is transported 40 kilometers away after normal operation, the temperature drop is only about 1 ℃. The thermal conductivity of polyurethane foam is the smallest among all thermal insulation materials, so it can reduce the heat loss of materials to the limit. With excellent thermal insulation performance, polyurethane foam is widely used in the thermal insulation layer of various hot water prefabricated directly buried pipelines.

　　2. Save energy

　　The closed cell rate of polyurethane foam is up to 88%. The extremely low water absorption and thermal conductivity, coupled with the insulation layer and high-density polyethylene outer protective pipe or fiberglass protective shell with reliable and tight waterproof performance, have changed the traditional situation of "wet cotton jacket" for laying heating pipelines in underground trenches, greatly reducing the overall heat loss performance of the heating pipeline. The heat loss of the heating pipeline network is 2%, which is less than the international standard requirement of 10%.

　　3. Easy and fast construction:

　　Polyurethane insulation pipes are prefabricated and tested by the manufacturer as finished composite insulation pipes, and then transported to the construction site for direct underground installation. The method is simple and efficient.

　　4. Low comprehensive engineering cost:

　　According to relevant departments' calculations, double pipe heating pipelines can generally reduce project costs by about 25% (using fiberglass as a protective layer) and 10% (using high-density polyethylene as a protective layer).

　　5. Strong applicability:

　　Polyurethane foam can be firmly bonded with a variety of materials. Therefore, using polyurethane foam as the insulation layer of directly buried prefabricated polyurethane insulation pipeline does not need to consider the adhesion of anti-corrosion layer and insulation layer.

　　6. Waterproof, anti-corrosion, long service life:

　　Due to the tight adhesion of the insulation layer of the polyurethane insulated pipeline to the outer surface of the steel pipe, it isolates the infiltration of air and water and can have a good anti-corrosion effect. At the same time, its foam pores are all closed, and its water absorption rate is very low. High density polyethylene outer protective pipes or fiberglass shells have good anti-corrosion, insulation properties, and high-strength mechanical properties. Therefore, the outer surface of the working pipe is difficult to be eroded by external air and water. As long as the water quality inside the pipeline is well treated, the service life of directly buried prefabricated polyurethane insulation pipelines can be over 50 years, which is 3-4 times longer than traditional trench laying and overhead laying.

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• Polyurethane direct buried insulation pipe