High-density polyethylene shell prefabricated direct buried insulation pipe application? Dacheng Xiangdong Insulation Refractory Material Factory 13473696600 15731614448
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High-density polyethylene shell prefabricated direct buried insulation pipe application? Dacheng Xiangdong Insulation Refractory Material Factory 13473696600 15731614448
High-density polyethylene shell prefabricated direct-buried insulation pipe is divided into three layers from the inside to the outside. The first layer: working steel pipe layer, according to the design and customer requirements, generally use seamless pipe (GB8163-87) spiral welded pipe (GB9711-88; SY /T5038-92) and straight seam welded pipe (GB3092-93). After the surface of the steel pipe is treated by advanced shot blasting and descaling process, the steel pipe has a derusting grade up to Sa2 grade in GB8923-1988 standard, and the surface roughness can reach R=12.5 micron in GB6060.5-88 standard.
The second layer: a polyurethane insulation layer, which is formed by injecting a rigid polyurethane foam raw liquid into the cavity formed between the steel pipe and the outer sheath by a high-pressure foaming machine. That is commonly known as the "tube tube foaming process." Its role is to waterproof, but to keep warm, and the third is to support the weight of the heating network. When the temperature of the conveying medium is: -50 ° C - 120 ° C, a rigid polyurethane foam is used as the insulating layer.
The third layer: high-density polyethylene protective layer, pre-made into a certain wall thickness of black (yellow) plastic pipe, after the corona process treatment. Its role is to protect the polyurethane insulation layer from mechanical hard objects, and the second is anti-corrosion and waterproof.
The high-density polyethylene shell prefabricated direct-buried insulation pipe is suitable for the insulation and cold preservation project of various media in the range of -50 °C - 150 °C. It is widely used in thermal insulation and cold preservation projects in urban central heating, warm rooms, cold storage, coal mines, oil ports, and chemical industries. However, high-density polyethylene is inferior in weather resistance to glass steel and has low heat resistance. High-density polyethylene heat resistance is 60 ° C -70 ° C, and FRP heat resistance is 100-120 degrees Celsius, therefore, should pay attention to the application!
Product advantages:
1 Reduce project cost.
According to the calculation of the relevant departments, the double-regulated heating pipeline can generally reduce the construction cost by 25% (using FRP as a protective layer) and 10% (using high-density polyethylene as a protective layer).
2 Low heat loss and energy saving.
Its thermal conductivity is: λ=0.013—0.03kcal/m?h?oC, which is much lower than other commonly used pipe insulation materials, and the thermal insulation effect is increased by 4~9 times. Further, its water absorption rate is very low, about 0.2 kg/m2. The reason why the water absorption rate is low is because the lowest price of the tube-buried tube is buried in the tube. The closed cell rate of the polyurethane foam tube is about 92%. The low thermal conductivity and low water absorption, plus the high-density polyethylene or FRP protective shell with good insulation and outer waterproofing, change the condition of the traditional ditch laying heating pipe “wet cotton quiltingâ€, greatly reducing the heating pipe. The overall heat loss, heat network heat loss is 2%, less than the international standard of 10%.
3 anti-corrosion, good insulation performance and long service life.
Since the polyurethane rigid foam insulation layer is tightly bonded to the outer skin of the steel pipe, the penetration of air and water is isolated, and a good anticorrosive effect can be achieved. At the same time, its foaming holes are closed and the water absorption is small. The high-density polyethylene casing and the FRP casing have good corrosion resistance, insulation and mechanical properties. Therefore, the outer skin of the working steel pipe is hardly eroded by the outside air and water. As long as the internal water quality of the pipeline is well treated, according to Dacheng Rongbang Anti-corrosion Insulation Materials Co., Ltd., the service life can reach more than 50 years, which is 3~4 times higher than the traditional trench laying and overhead laying.
4. Pipe insulation. It occupies less land and has faster construction and is environmentally friendly.
Tube-in-tube direct-buried insulation pipe insulation does not require masonry to build a huge trench, and only needs to bury the insulation pipe underground, thus greatly reducing the project land occupation, reducing the earthwork excavation volume by more than 50%, and reducing the amount of civil construction and concrete. 90%. At the same time, the lowest price of the tube buried pipe insulation pipe / / pipe pipe directly buried insulation pipe manufacturers offer polyurethane insulation pipe insulation pipe processing and on-site trenching in parallel, only on-site joints, can shorten the construction period of about 50%.
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