1. Reduce the project cost.

经有关部门计算，双管供热管道的造价一般可降低25%（以玻璃钢为保护层）和10%（以高密度聚乙烯为保护层）。γ

According to the calculation of relevant departments, the cost of double pipe heating pipeline can be reduced by 25% (with FRP as the protective layer) and 10% (with HDPE as the protective layer). Gamma

2.热损失小，节约能源。

2. Small heat loss and energy saving.

其热导率是：λ= 0.0130.03kcal /米·H·摄氏度，比过去使用的其它管道保温材料低得多，提高绝缘49倍的效果。再次其吸水率极低，大约0.2千克/。其原因是因为低吸水率的聚氨酯泡沫的闭孔的份额高达92％。低吸水率和低的导热性，加上外绝缘层和杰出的防水性高密度聚乙烯或玻璃纤维的保护壳，改变了传统沟槽敷设加热管“穿湿外套”的情况下，大大减少了加热管总的热丢失，热净2％的水平低于10％的热量丢失。

Its thermal conductivity is: λ = 0.013 to 0.03kcal/m · h · C, which is much lower than other pipeline insulation materials used in the past, and improves the insulation effect by 4-9 times. Again, its water absorption is very low, about 0.2 kg / m2. The reason is that the share of obturator with low water absorption polyurethane foam is as high as 92%. Low water absorption and low thermal conductivity, together with the outer insulation layer and excellent waterproof high-density polyethylene or glass fiber protective shell, changed the traditional groove laying heating pipe "wet coat" situation, greatly reduced the total heat loss of heating pipe, the international level of thermal net 2% is less than 10% of heat loss.

三。防腐，绝缘性能好，使用寿命长。

3. Anticorrosion, good insulation and long service life.

因为聚氨酯硬质泡沫隔热层与钢管外层紧密结合，隔离了空气和水的渗透，聚氨酯硬质泡沫隔热层具有杰出的防腐效果。一起，其泡沫孔都关闭，吸水率小。高密度聚乙烯外壳和玻璃纤维增强塑料外壳均具有杰出的防腐、绝缘和力学性能。因此，工作钢管的外层很难被外部空气和水侵蚀。只需管道内部水质杰出，使用寿命可达50多年，架空敷设的使用寿命是传统沟渠的3-4倍。

Because the polyurethane rigid foam insulation layer is tightly combined with the outer layer of the steel pipe, the air and water penetration is isolated, and the polyurethane rigid foam insulation layer has excellent anticorrosive effect. Together, the foam holes are closed and the water absorption rate is small. High density polyethylene (HDPE) and glass fiber reinforced plastic (GFRP) have excellent corrosion resistance, insulation and mechanical properties. Therefore, the outer layer of working steel pipe is difficult to be eroded by external air and water. As long as the internal water quality of the pipeline is excellent, the service life can reach more than 50 years, and the service life of overhead laying is 3-4 times of that of traditional ditches.

4，占地面积小，施工速度快，有利于。

4. Small floor area, fast construction speed and environmental protection.

直埋供热管道不需要修建巨大的地沟，只需在地下埋设保温管，大大减少了施工面积，减少土方开挖量50%以上，减少了土建砌体和混凝土量90%。一起保温管加工与现场挖沟并行进行，只要现场接头才能将施工周期缩短50%以上。γ

Directly buried heat supply pipeline does not need to build a huge trench, only need to bury insulation pipe underground, which greatly reduces the construction area, reduces the amount of earthwork excavation by more than 50%, and reduces the amount of civil masonry and concrete by 90%. The construction period can be shortened by more than 50% as long as the field joints are made. Gamma

5 .。

5. Safety.

聚氨酯直埋保温管设泄漏报警线，通知渗漏人员快速处理漏水管段，确保供热管网运转。

The polyurethane directly buried insulation pipe is equipped with leakage alarm line to inform the leakage personnel to deal with the leakage pipe section quickly, so as to ensure the safe operation of the heating pipe network.