Buried insulating pipe structure is divided into three levels from the inside out, the first layer is the transmission medium core tube, core tube is generally made of seamless pipe (GB8163-87) spiral welded pipe (GB9711-88; SY/T5038-92 ) and Longitudinal (GB3092-93) and galvanized steel pipe and PPR, etc. according to the user asked to select the core tube diameter is [φ22, 25,32,38,45,57,76,89,108,133 159,219,273,325,377,426,478,529,630,720,820,920,1220; insulation layer material for the polyurethane foam composite insulation materials, [its insulation thickness of 30-150mm]; The outer casing of high density polyethylene jacket tube, FRP Pipe and anti-corrosion steel pipe buried insulating pipe, also known as "tube in tube" constitute "two-step method" is a layer of protection from high density polyethylene, polyurethane rigid The foam plastic insulation materials and steel. Density of 60kg/m3 to 80kg/m3 rigid polyurethane foam insulation material, fully fill up the gap between the steel pipe and casing, and the bonding strength of steel pipe, coat pipe and the insulation layer between the three to form a solid whole. Polyurethane buried insulating pipe foam with good mechanical properties and thermal insulation properties, usually can be high temperature of 120 ° C through modification or other insulating material combinations can be high temperature of 180 ° C, for a variety of cold, hot water, high and low temperature piping insulation works outer casing of polyethylene tube using high-density polyethylene material, with high mechanical strength and excellent corrosion resistance, to protect the pipe to avoid in the process of transportation, installation and use of the damage caused by external factors. 
 Manufacturing jacket tube should be added antioxidants, UV stabilizers and carbon black. 
 Production process 
 1, material 2, extrusion, mold, to cool for 5 traction 6, the inner surface of the corona treatment 7, cutting eight test 9, finished 
 Note A. polyethylene pipe easy to aging, such as open storage to use the tarpaulin and other items covered, dumps should stay away from high heat and sources of ignition, made of insulating pipe to prohibit the exposure to sudden cold, or polyethylene pipe easy to crack. affect product performance and service life. 
 B. Transport and wear tube, avoid rough handling, hook too small, excellent, excessive force, otherwise easily lead to the polyethylene pipe break, scratch or tear. 
 C. The pipe wall thickness adjustable, wall thickness, color according to user requirements, the wall thickness of pipe insulation layer thickness is approximately the number should be the actual thickness. 
 D. Working with pipe supporting bracket, plastic plugs, two flanges, welding rods, welding torch, heat shrink bands complete. 
 E. table tolerances CJ/114-2000 industry standard developed. 
 Calculated as follows: outer diameter ≤ 400mm, upper and lower deviation = 0.1 × the nominal wall thickness of 0.2 {direct burial industry information polyurethane insulation tube} {direct buried polyurethane insulation pipe price} 
 Outside diameter ≥ 400mm, upper and lower deviation = 0.15 × nominal wall thickness of 0.2 high density polyethylene jacket insulation tube prefabricated directly buried polyurethane foam bubble buried insulating tube very prominent advantages: 
 1, polyurethane buried insulating tube, good insulation properties, heat loss is only 25% of the traditional pipe, long run can save a lot of energy and significantly reduce energy costs. 
 2, has a strong, waterproof and corrosion-resistant ability, do not need to include a trench can be directly buried in the ground or water, the construction is simple, rapid, and lower total cost. 
 3, at low temperatures also has good resistance to corrosion and impact resistance can be directly buried in the underground permafrost. 
 Life of up to 30-50 years, the right to install and low maintenance costs allows the pipe network. 
 Can be set to alarm systems, automatic detection of leakage of the pipe network failure, accurately indicates the fault location and automatic alarm. 
 6, the service life of up to 30-50 years. Diameter: DN15 - DN600 thickness :15 - 50mm use: central heating pipes, cooling pipes, industrial pipes. 
 7 oxygenated Index: ≥ 27 Density :40 - 70kg / cubic m hydrophobic rate: 0.03 kg / cubic cm thermal conductivity: 0.022kcal/mh 
 {Buried polyurethane insulation tube} and industry information {Buried polyurethane insulation pipe price} 

 Polyurethane insulating buried pipe in foreign countries, some developed countries has become a more mature advanced technology. Over the last decade, our heating engineers and technicians through digestion, absorption of this advanced technology is driving the development of the domestic pipe network laying technology to a higher level. Ten years of practical results dramatically demonstrate that polyurethane casein insulation compared with the traditional trench and aerial laying buried pipe laying method has many advantages. Buried insulating pipe steel pipe by the transmission medium, high density polyethylene jacket tube, and steel pipe and jacket tube between rigid polyurethane foam insulation layer in close combination. 

 Buried insulating pipe from the inside out a three-tier structure 
 First layer: the work of steel pipe layer design and customer requirements is generally used in seamless pipe (GB8163-87) spiral welded pipe (GB9711-88; SY/T5038-92) and Longitudinal (GB3092-93). The processing of the steel pipe surface after shot blasting process, rust, steel grade up to GB8923-1988 standard of Sa2, surface roughness up to GB6060.5-88 R = 12.5 microns. 
 The second layer: polyurethane insulation with high-pressure foaming machine in the cavity formed by the pipe between the outer casing of a one-time injected into the liquid of rigid polyurethane foam made. Commonly known as the "tube in tube foaming process." Its role in First waterproof, insulation, support hot net weight. When the transmission medium temperature: -50 ℃ -120 ℃, the choice of rigid poly semicarbazide ester foam as insulation layer. 
 The third layer: high-density polyethylene protective layer prefabricated into a certain wall thickness of the black plastic pipe (yellow), and its role one is to protect the polyurethane insulation from mechanical hard object damage, and second, anticorrosion and waterproof. 
 Steam pipe directly buried buried steam insulation tube insulation pipe is steel pipe by the transmission medium, the insulating layer and the outer casing pipe close combination central heating prefabricated steam buried pipe steam; which the insulating layer according to the pipeline demand selection of different insulation materials generally divided into a polyurethane foam insulation, rockwool insulation silicate thrown silk carpet + calcium silicate watt + polyurethane foam composite insulation; outer protection tube can be divided into the steel sets of steel insulation pipe and fiberglass shell insulation tube; Langfang Xin large insulation materials Limited is a brief introduction to the structure and production process of the composite tube steam insulation. 

 Steel sets of steel steam buried insulating pipe 
 Work of steel pipe 
 The work of the steel pipe selected second inorganic zinc-rich primer (temperature ≥ 400 ° C) and anti-corrosion coatings, pipe port selection of polyethylene film or layer PE wrapping sealed to prevent moisture or construction prior to installation into the into the water. The multi-layer of insulation material wrong seam dressing, effective in reducing heat loss, while controlling coat the surface of measures to prevent the generation of a cold bridge, so that the jacket coating temperature control is guaranteed. Multi-layer aluminum foil reflective layer of insulation material wrapped effective in reducing heat loss, so that the steam pipe is more economical. 
 The outer casing pipe anti-corrosion coat steel pipe is a kind of anti-corrosion performance of steel pipe, and has good insulation properties, is widely used in the construction and promotion, and continuous improvement and popularization. The anti-corrosion pipe insulation have different processing types and methods of different processing methods to determine the steel pipe has a different performance and functionality, and the use of the range will change. 
 # Anti-corrosion pipe insulation production needs to be produced in accordance with national standards, different processing methods follow different standards, but must comply with national production standards, and to strictly follow and implement 
 Insulating layer of rigid polyurethane foam or rock wool coil 
 A rigid polyurethane foam polyurethane insulation materials, density 60kg/m3 to 80kg/m3 rigid polyurethane foam, fully fill up the gap between the steel pipe and casing, and the bonding strength, so that the steel pipe, anti-corrosion coat steel pipe and the insulation layer between the three form a solid whole. Polyurethane buried insulating pipe foam with good mechanical properties and thermal insulation properties, temperature 120 ℃ usually modified or combination of insulation materials can be temperature 180 ° C 
 Two the rockwool membrane rockwool performance characteristics: 
 Insulation properties: thermal insulation performance, the basic characteristics of the rock wool, slag wool products, rock wool thermal conductivity at room temperature (25 ° C or so), usually in the 0.03 ~ 0.047W / (moK) between the buried insulating tube of the application: 

 The insulation of polyurethane buried insulating pipe suitable for conveying the range of -50 ℃ -150 ℃, the medium is cold works. It is widely used in urban central heating Nuanshi, cold storage, coal, oil pipelines, ports, chemical, natural gas pipelines, electricity buried, central air-conditioning pipe insulation, conduit, steam insulation of the insulated pipeline and other industries to cold works. The advantage of the characteristics of a polyurethane buried insulating pipe to reduce the project cost. According to estimates, the control of heating pipes, under normal circumstances can be reduced by 25% of the project cost (using glass, steel protective layer) and 10% (high-density polyethylene protection layer) around. 2 heat loss and save energy. Thermal conductivity: λ = 0.013-0.03kcal / m? H? OC, much lower than other previously used pipe insulation materials, insulation effect is increased by 4-9 times. Low water absorption, approximately 0.2kg/m2. The low water absorption is due to the polyurethane foam closed-cell rate of 92%. Low thermal conductivity and low water absorption, high density polyethylene or fiberglass protective shell with the insulation layer and the outside water resistance good, changed the traditional trench laying heating pipes to wear wet cotton-padded jacket "situation, greatly reducing the heating pipe The overall heat loss, heat loss of the heating network of 2%, 10% less than the international standard requirements. 3 anti-corrosion, good insulation properties, long service life. Polyurethane rigid foam insulation layer closely bonded in the skin of the steel pipe, cut off from air and water infiltration, can play a good anti-corrosion effect. Its foam holes are closed, water absorption is very small. High density polyethylene shell, fiberglass shell has a good corrosion protection, insulation and mechanical properties. Therefore, the steel skin is difficult to subject to outside air and water erosion. According to data from abroad, the service life of up to 50 years or more, than the traditional trench laying as long as the water quality of the pipeline internal processing overhead installation service life of three to four times higher. 4. The small footprint and fast construction is conducive to environmental protection. Buried heating pipe does not require laying a huge trench, simply insulating pipe buried people underground, thus greatly reducing the project covers an area, reducing earthwork excavation is about 50%, 90% to reduce civil masonry and concrete. The same time, the insulation tube processing and on-site trenching parallel, just the scene joints, can shorten the duration of about 50%.