Polyurethane direct buried pipe, polyurethane insulation direct buried pipe, polyurethane direct buried pipe factory

Description :

　　Classification of direct buried polyurethane insulation pipes:

　　1. According to the temperature of the conveying medium, it can be divided into: normal temperature polyurethane direct buried insulation pipe, high temperature polyurethane direct buried insulation pipe, and deep cold polyurethane direct buried insulation pipe;

　　2. According to the different outer protective layers, it can be divided into: fiberglass outer protective layer polyurethane direct buried insulation pipe, high-density polyethylene outer protective layer polyurethane direct buried insulation pipe, steel outer protective layer polyurethane direct buried insulation pipe, and other outer protective layer direct buried insulation pipes;

　　3. There are many kinds of different transmission media: such as polyurethane prefabricated insulation pipe for water supply, high-temperature resistant polyurethane insulation pipe, directly buried polyurethane composite prefabricated insulation pipe for steam transmission, and buried rigid polyurethane foam plastic anti-corrosion insulation pipe for oil, etc. There are many other names such as polyurethane buried pipe, polyurethane prefabricated pipe, polyurethane direct buried prefabricated pipe, polyurethane jacket pipe, polyurethane foam insulation pipe, and so on.

　　Polyurethane direct buried insulation pipe structure:

　　Inner layer: working steel pipe layer

　　According to the design and customer requirements, seamless pipes (GB8163-87), spiral welded pipes (GB9711-88; SY/T5038-92), and straight seam welded pipes (GB3092-93) are generally selected. After advanced shot blasting and rust removal process, the rust removal grade of the steel pipe can reach Sa2 level in GB8923-1988 standard, and the surface roughness can reach R=12.5 microns in GB6060.5-88 standard.

　　Middle layer: polyurethane insulation layer

　　It 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. It is commonly known as the "pipe in pipe foaming process". Its functions include waterproofing, insulation, and supporting the self weight of the heating network. When the temperature of the conveying medium is -50120, rigid polyurethane foam is selected as the insulation layer.

　　Outer layer: high-density polyethylene protective layer

　　Prefabricated black (yellow) plastic pipes with a certain wall thickness are used to protect the polyurethane insulation layer from mechanical damage and to prevent corrosion and waterproofing.

　　Polyurethane direct buried insulation pipes have outstanding advantages:

　　1. Polyurethane direct buried insulation pipes have good insulation performance, with heat loss only 25% of traditional pipes. Long term operation can save energy and reduce energy costs.

　　2. It has strong waterproof and corrosion-resistant capabilities, does not require a pipe trench, can be directly buried underground or in water, is easy and fast to construct, and has a low overall cost.

　　3. It also has good corrosion resistance and impact resistance under low temperature conditions, and can be directly buried in frozen soil underground.

　　4. The service life can reach 30-50 years, and correct installation and use can reduce the maintenance cost of the pipeline network.

　　5. An alarm system can be set up to automatically detect pipeline leakage faults, accurately indicate the fault location, and automatically sound an alarm.

　　6. Diameter: DN15- DN600 Thickness: 15-50mm Application: Central heating and cooling pipelines Industrial pipelines, etc.

　　7. Oxygen index: 27 Density: 40-70kg/cubic meter Hydrophobicity: cubic centimeter Thermal conductivity:

　　Polyurethane insulated buried pipes have become a relatively mature technology in some developed countries abroad. In recent years, Chinese heating engineering technicians have been promoting the development of domestic pipeline laying technology to a higher level by digesting and absorbing this technology. The practical achievements in recent years have fully proved that the laying method of polyurethane insulation buried pipes has many advantages compared to traditional trench and overhead laying. This is also the intrinsic driving force behind the rapid development of polyurethane insulated buried pipes in China's heating engineering.

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