Polyurethane insulation direct buried pipe prefabricated polyurethane insulation pipe manufacturer

Description :

　　Polyurethane direct buried insulation pipe with a three-layer structure from inside to outside

　　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.

　　Application of polyurethane buried insulation pipe:

　　Polyurethane direct buried insulation pipes are suitable for insulation and cooling projects that transport various media within the range of -50150. It is widely used in insulation and cooling projects for urban centralized heating, warm rooms, cold storage, coal mines, oil ports, chemical industries, and other industries.

　　Advantages and characteristics of polyurethane buried insulation pipe:

　　1. Reduce project costs.

　　According to relevant departments' calculations, double pipe heating pipelines can generally reduce project costs by about 25% (using fiberglass as a protective layer) and 10% (using high-density polyethylene as a protective layer).

　　Low heat loss and energy conservation.

　　Its thermal conductivity is λ=0.0130.03kcal, which is much lower than other commonly used pipeline insulation materials in the past, and the insulation effect is improved by 49 times. Moreover, its water absorption rate is very low, about 0.2kg/m2. The reason for low water absorption is that the closed cell rate of polyurethane foam is up to 92%. Low thermal conductivity and low water absorption, combined with insulation layer and high-density polyethylene or fiberglass protective shell with good waterproof performance on the outside, have changed the traditional situation of "wet cotton jacket" for laying heating pipes in underground trenches, reducing the overall heat loss of heating pipes, and the heat loss of the heating network is 2%.

　　3. Anti corrosion, good insulation performance, and long service life.

　　As the polyurethane rigid foam insulation layer is closely bonded to the outer skin of the steel pipe, it can isolate the infiltration of air and water and play a good anti-corrosion role. At the same time, its foam pores are all closed, and its water absorption is very low. The high-density polyethylene shell and fiberglass shell both have good anti-corrosion, insulation, and mechanical properties. Therefore, the outer skin of the working steel pipe is difficult to be eroded by external air and water. As long as the water quality inside the pipeline is treated well, according to foreign data, the service life can reach more than 50 years, which is 34 times longer than the service life of traditional trench laying and overhead laying.

　　4. Less land occupation, faster construction, and favorable environmental protection.

　　Directly buried heating pipelines do not require the construction of large trenches, only the insulation pipes need to be buried underground, thus reducing project land occupation, reducing excavation volume by more than 50%, and reducing civil engineering masonry and concrete volume by 90%. At the same time, the processing of insulation pipes and on-site trenching are carried out in parallel, and only on-site joints are required, which can shorten the construction period by more than 50%.

　　Polyurethane direct buried insulation pipes are made of high-density polyethylene material, which has strong waterproof and corrosion-resistant capabilities. Polyurethane direct buried insulation pipes do not require pipe trenches and can be directly buried underground or in water. The construction is simple and fast, and the overall cost is low. Made with various additives such as antioxidants, and strictly inspected for the quality of raw materials and products to ensure that the product quality meets the CJ/1142000 standard and the technical requirements for direct buried pipe outer protective pipes, improving the overall quality of the outer protective pipes. Polyurethane direct buried insulation pipe is a hard polyurethane insulation material with low thermal conductivity and good thermal insulation performance, which has excellent thermal insulation properties. The on-site joint insulation of polyurethane buried insulation pipes must be carried out after passing the pressure test. The on-site joint insulation construction is unique to the construction of polyurethane buried insulation pipes, and the quality of construction directly affects the service life. There are two methods for insulation layer: on-site foaming construction and insulation tile construction. Regardless of which method is used for construction, defects such as circular space, cracking, and delamination must not occur. There are various methods for protective layer (such as high-density polyethylene and fiberglass protective layer), but the integrity, tightness, and waterproofness of the joint must be ensured.

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