Insulation large diameter spiral pipe characteristics:
Polyurethane foam has good mechanical properties and thermal insulation properties, usually can withstand temperature 120 ℃, through the modification or combination with other thermal insulation materials can withstand temperature 180 ℃.
Polyurethane buried insulation pipe insulation performance is strong, can ensure that the temperature of the internal transportation material is not subject to external changes, in the winter cold resistance performance is good. Polyurethane buried thermal insulation pipe sound insulation performance is very good, to avoid the transportation of liquid in the pipeline flow through the sound nuisance. At the same time polyurethane buried insulation pipe can do anti-corrosion, and does not absorb water, making the pipe installation location is not restricted, can be used in various locations. Polyurethane buried insulation pipe construction is simple and fast, high efficiency, reduce capital cost investment. Polyurethane buried thermal insulation pipe for low heat loss, can save energy.
According to the relevant departments of the calculation, double control heating pipe, in general, can reduce the project cost of 25% (using glass fiber reinforced plastic to do the protective layer) and 10% (using high-density polyethylene to do the protective layer) or so.
Polyurethane buried heat preservation pipe its thermal conductivity: λ = 0.013-0.03kcal/m?h?oC, than other commonly used in the past pipe insulation material is much lower than the heat preservation effect to improve the heat preservation effect of 4 ~ 9 times. And then its water absorption is very low, about 0.2kg/m2. The reason for low water absorption is due to the closed cell rate of polyurethane foam is as high as 92% or so. Low thermal conductivity and low water absorption, coupled with the insulation layer and outside the waterproof performance of high-density polyethylene or glass fiber reinforced plastic protective shell, changing the traditional trench laying heating pipeline "wearing a wet coat" situation, greatly reducing the overall heat loss of the heating pipeline, heat loss of the heat network of 2%, less than 10% of the international standard requirements.
