Black jacket insulation pipe is a kind of directly buried prefabricated insulation pipe with good thermal insulation performance, safety and reliability, and low engineering cost. The directly buried insulation pipe not only has the advanced technology and practical performance that traditional trench and overhead laying pipeline can't match, but also has remarkable social and economic benefits, which is also a powerful measure of heating and energy saving.
The insulation pipe of black jacket is divided into three layers from inside to outside
Near the front layer: according to the design and customer requirements, seamless pipe (gb8163-87), spiral welded pipe (gb9711-88; SY / t5038-92) and longitudinal welded pipe (gb3092-93) are generally selected for the working steel pipe layer. After the surface of steel pipe is treated by advanced shot blasting technology, the rust removal grade of steel pipe can reach SA2 grade in gb8923-1988 standard, and the surface roughness can reach r = 12.5 μ m in gb6060.5-88 standard.
The second layer: the polyurethane insulation layer is made of high pressure foaming machine in the cavity formed between the steel tube and the outer sheath. It is commonly known as "tube in tube foaming process". Its function is waterproof, thermal insulation, and supporting the self weight of heat supply network. When the conveying medium temperature is -50 - 120 - C, rigid polyurethane foam is chosen as insulation layer.
The third layer: HDPE protective layer is prefabricated into a certain wall thickness of black (yellow) plastic pipe. Its function is to protect the polyurethane insulation layer from mechanical hard objects damage, and the other is anti-corrosion and waterproof. Polyethylene outer pipe is made of high density polyethylene material, which has high mechanical strength and excellent corrosion resistance. It can protect the pipe from damage caused by external factors during transportation, installation and use. Antioxidants, UV stabilizers and carbon black should be added to the outer casing. Production process 1, feeding 2, extrusion 3, die 4, cooling 5, traction 6, corona treatment of inner surface 7, cutting 8, inspection 9, finished product
Advantages of black jacket insulation pipe
(1) The project cost is low
(2) It has the advantages of less land occupation, fast construction and environmental protection.
(3) The jacket tube has the advantages of energy saving, anticorrosion, good insulation and long service life.
(4) There are leakage alarm lines for safety. Once there is leakage in the pipeline, through the conduction of the alarm line, the accurate position and degree of leakage of the insulation pipeline can be displayed on the special detection instrument, so as to inform the leakage inspection personnel to deal with the leaking pipe section quickly and ensure the safe operation of the heating pipe network.
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