The prefabricated directly buried insulation pipe is composed of a conveying medium steel tube, a polyurethane rigid foam pipe insulation layer and a high-density polyethylene external protection pipe.

　　Layer: working steel pipe layer

　　According to the design and customer's requirements, we can choose seamless spiral welded pipe and straight welded pipe. After the surface of steel pipe is treated by advanced shot blasting, the rust removal of steel pipe can reach SA2 of gb8923-1988 standard, and the surface roughness can reach gb6060. At 5-88, R equals 12. 5 microns.

　　Second floor: polyurethane insulation

　　A rigid polyurethane foam was formed by injecting the original solution into the cavity formed between the steel pipe and the outer sheath two times by using the high-pressure foaming machine. Commonly known as "tube in tube foaming process". Its function is waterproof, the second is heat preservation, and the third is to support the thermal net weight. Rigid polyurethane foam is selected as the insulation layer when the conveying medium temperature is -50 C -120 C.

　　Three layers: high density polyethylene protective layer

　　The prefabricated black (yellow) plastic pipe has a fixed wall thickness. Its function is to protect the polyurethane insulation layer from mechanical damage. Secondly, it is anti-corrosion and waterproof. Advanced equipment, excellent technical personnel, scientific management mode, perfect quality assurance system and reasonable price.

　　Prefabricated directly buried insulation pipe

　　The advantages of prefabricated directly buried insulation pipe are mainly reflected in the following aspects:

　　1. Corrosion resistance: chemical inert material, with excellent corrosion resistance, and can choose different corrosion-resistant pipes according to different transmission medium.

　　2. High mechanical strength: it has good resistance to ultra-high water pressure, external pressure and impact, and can be designed and manufactured according to the required pressure.

　　3. Strong temperature adaptability: the temperature range of prefabricated directly buried insulation pipe is more than - 70 ℃, less than 250 ℃, and it will not break under the freezing medium.

　　4. Low fluid resistance: the inner wall of the pipe is smooth, and the roughness coefficient is 0. Under the same flow rate, the pipe diameter can be reduced.

　　5. Light weight, long service life: light weight, convenient transportation, low construction cost, no maintenance, service life up to more than 50 years.

　　6. Ensure the water quality: ensure the water quality is non-toxic, ensure the delivery of drinking water, can maintain the long-term health of water quality.

　　The above is the introduction of the black jacket direct buried straight seam steel tube. If you want to know more, please visit the website: https://www.sdhpgy.com