First floor: The steel pipe layer for operation generally uses seamless pipes (GB8163-87), spiral welded pipes (GB9711-88; SY/T5038-92), and straight seam welded pipes (GB3092-93) according to the plan and customer requirements. After the shot blasting rust removal process on the surface of the steel pipe, the rust removal grade of the steel pipe can reach Sa2 level in the GB8923-1988 standard, and the surface roughness can reach R=12.5 microns in the GB6060.5-88 standard. The second layer: the polyurethane insulation layer is made by injecting the original liquid of rigid polyurethane foam into the cavity formed between the steel pipe and the outer protective layer with a high-pressure foaming machine at one time. It is commonly known as "pipe in pipe foaming process". Its effect is waterproof, thermal insulation, and supporting the weight of the heat supply network. When the temperature of the transport medium is -50 ℃ -120 ℃, rigid polyurethane foam plastic is used as the insulation layer. The third layer: high-density polyethylene protective layer is prefabricated into black (yellow) plastic pipes with certain wall thickness. Its effect is to protect the polyurethane insulation layer from damage by mechanical hard objects, and its effect is anti-corrosion and waterproof. As the data of major industrial departments, polyurethane insulation pipes are welcomed by people because of their excellent functions and characteristics. Now, many professional planning institutes and manufacturers in China are constantly updating the appearance and functions of insulation pipes with the skills they are using, of course The competition in the market is inevitable. There are also many types of polyurethane insulation pipes. Now let's learn about the advantages of directly buried polyurethane insulation pipes? Polyurethane direct buried insulation pipes have good insulation and sealing effects when used in heating (cooling) projects. When buried underground, they not only save energy, do not occupy land, but also beautify the environment. When used in oil and gas transportation, it can meet the requirements of long-distance transportation and eliminate the need for operational protection,bigSatisfying the insulation and antifreeze requirements to the extreme, reducing heating equipment, lowering project costs, and providing particularly convenient equipment, shortening the construction period. When used for geothermal and hot spring transportation, it meets the cooling requirements and completes long-distance transportation. Used in water conservancy and mining, it meets the requirements of cold and anti freezing, insulation and anti-corrosion. In addition, there is also a wide range of application space in the pipeline transportation of chemical materials.
Overall, polyurethane direct buried insulation pipes have many advantages such as energy saving, waterproof and anti-corrosion, anti freezing and cold resistance, and economic beauty. Moreover, it has been widely used throughout the country and is highly welcomed by users.