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Steel sleeve steel insulation pipe
Direct buried insulation pipe, also known as "pipe pipe", is composed of "two-step method", which is composed of high density polyethylene outer protective layer, polyurethane hard foam plastic insulation material and steel pipe. The insulation layer material is a rigid polyurethane foam with a density of 60 kg/m3 to 80 kg/m3, which fully adds the gap between the steel pipe and the casing, and has a certain bonding strength, so that the steel pipe, the jacket pipe and the insulation layer form a solid whole. Polyurethane directly buried thermal insulation pipe foam has good mechanical properties and thermal insulation properties, usually can withstand high temperature 120℃ through modification or combination with other thermal insulation materials can withstand high temperature 180℃, suitable for all kinds of cold, hot water high and low temperature pipeline thermal insulation engineering.
Polyurethane directly buried thermal insulation pipe is suitable for the thermal insulation engineering of various media in the range of-50℃ - -150℃. It is widely used in urban central heating, heating room, cold storage, coal mine, oil pipeline port, chemical industry, natural gas pipeline, power directly buried, central air conditioning pipeline insulation, cable pipe, steam insulation pipe and other industries of thermal insulation and cold protection engineering.
The advantages of polyurethane directly buried thermal insulation tube
1. Reduce the project cost. According to the calculation of the relevant departments, the double control heating pipeline, under normal circumstances, can reduce the project cost of 25%, the use of FRP as a protective layer.
2. Low heat loss and energy saving. Its thermal conductivity is: λ = 0.013—0.03kcal/
The mhoC is much lower than other commonly used pipe insulation materials in the past, and the insulation effect is 4~9 times higher. Moreover, its water absorption rate is very low, at about 0.2 kg/m2. The reason for the low water absorption is that the closure rate of polyurethane foam is up to about 92%. Low thermal conductivity and low water absorption, coupled with the insulation layer and good waterproof performance of high density polyethylene or FRP protective shell, changed the traditional trench laying heating pipeline "wear wet padded jacket" situation, greatly reduce the overall heat loss of heating pipeline, heat network heat loss is 2%, less than the international standard requirements of 10%.
3. Anti-corrosion resistance, good insulation performance, and long service life. Because the polyurethane hard foam insulation layer is closely bonded to the skin of the steel pipe, isolated from the infiltration of air and water, it can play a good anti-corrosion effect. At the same time, its foaming holes are closed, and the water absorption is very small. High density polyethylene shell, glass RP shell have good corrosion, insulation and mechanical properties. Therefore, the outer skin of the working steel pipe is difficult to be eroded by the external air and water. As long as the internal water quality of the pipeline is well treated, according to foreign data, the service life can reach more than 50 years, which is 3~4 times higher than the traditional trench laying and overhead laying.
4. Less land area, fast construction, and favorable for environmental protection. Direct buried heating pipeline does not need to build a huge trench, only to bury the insulation pipe underground, so greatly reducing the project area, reducing the excavation of earthwork by more than 50%, reduce the amount of civil masonry and concrete by 90%. At the same time, the insulation pipe processing and on-site trench parallel, only the site joint, can shorten the construction period by more than 50%.
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