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Description :

　　Overview of polyurethane prefabricated buried insulation pipe:

　　The structure of polyurethane prefabricated buried insulation pipe is divided into three layers from inside to outside. The inner layer is the working core pipe for conveying the medium. The core pipe is generally made of seamless pipe (GB8163-87), spiral welded pipe (GB9711-88; SY/T5038-92), straight seam welded pipe (GB3092-93), galvanized steel pipe and PPR, etc., and the core pipe diameter is selected according to different user requirements. The diameter of the core pipe is φ 22, 25, 32, 38, 45, 57, 76, 89, 108, 133, 159, 219, 273, 325, 377, 426, 478, 529, 630, 720, 820, 920, 1220; The thermal insulation layer is made of polyurethane foam plastic or composite thermal insulation material, with a thickness of 30-150mm; the outer protective layer is made of high-density polyethylene jacket pipe, glass fiber reinforced plastic winding pipe and anti-corrosion steel pipe.

　　Performance of polyurethane prefabricated buried insulation pipe:

　　1. Polyurethane prefabricated buried insulation pipes have good mechanical and thermal insulation properties, and can generally withstand high temperatures up to 120 ° C. By modifying or combining with other insulation materials, they can withstand high temperatures up to 180 ° C. They are suitable for insulation projects of various cold, hot, and low-temperature pipelines.

　　2. Polyurethane prefabricated directly buried insulation pipe, also known as "pipe in pipe", is composed of "two-step method", which is composed of high-density polyethylene outer protective layer, polyurethane rigid foam plastic insulation material and steel pipe. The insulation layer is made of rigid polyurethane foam with a density of 60kg/m3 to 80kg/m3, which can fully fill the gap between the steel pipe and the casing, and has a certain bonding strength, so that the steel pipe, the casing and the insulation layer form a solid whole.

　　Advantages of polyurethane prefabricated buried insulation pipe:

　　1. Polyurethane prefabricated 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. The service life can reach 30-50 years. Pipe diameter: DN15-DN600, used for centralized heating pipelines, refrigeration pipelines, industrial pipelines, etc.

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

　　Development prospects of polyurethane prefabricated buried insulation pipes:

　　Polyurethane prefabricated buried insulation pipes have become a relatively mature technology in some developed countries abroad. In the past decade, heating engineering technicians have been promoting the development of pipeline laying technology to a higher level by digesting and absorbing this technology.

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