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External protective layer: high density polyethylene external protective tube insulation layer: polyurethane rigid foam insulation layer work steel pipe: straight seam steel pipe.
The prefabricated directly buried insulation pipe can be directly buried in 0.6-1.2m frozen soil layer, the heat loss can be reduced by more than 40% compared with ordinary pipes, and the service life can be increased by more than 3-5 times compared with other heat insulation and anti-corrosion materials, and the service life can reach 30 years.
The polyurethane insulated pipe is made of high density polyethylene outer tube, polyurethane foam insulation layer and seamless steel pipe. The straight seam steel pipe has hollow section, which is a kind of welded steel pipe. It refers to the steel pipe whose weld is parallel to the longitudinal direction of the steel pipe. It is widely used as the pipeline for conveying fluid, such as the pipeline for transporting oil, natural gas, gas, water and some solid materials. The pipe diameter of straight seam pipe is dn25-dn150, and the material is Q235B, so the price is lower than that of seamless pipe.
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