1. Reduce the project cost.

經有關部門計算，雙管供熱管道的造價一般可降低25%（以玻璃鋼為保護層）和10%（以高密度聚乙烯為保護層）。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.熱損失小，節約能源。

2. Small heat loss and energy saving.

其熱導率是：λ= 0.013至0.03kcal /米·H·攝氏度，比過去使用的其它管道保溫材料低得多，提高絕緣4至9倍的效果。再次其吸水率極低，大約0.2千克/平方米。其原因是因為低吸水率的聚氨酯泡沫的閉孔的份額高達92％。低吸水率和低的導熱性，加上外絕緣層和杰出的防水性高密度聚乙烯或玻璃纖維的保護殼，改變了傳統溝槽敷設加熱管“穿濕外套”的情況下，大大減少了加熱管總的熱丟失，熱凈2％的水平低于10％的熱量丟失。

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，絕緣性能好，使用壽命長。

3. Anticorrosion, good insulation and long service life.

因為聚氨酯硬質泡沫隔熱層與鋼管外層緊密結合，隔離了空氣和水的滲透，聚氨酯硬質泡沫隔熱層具有杰出的防腐效果。一起，其泡沫孔都關閉，吸水率小。高密度聚乙烯外殼和玻璃纖維增強塑料外殼均具有杰出的防腐、絕緣和力學性能。因此，工作鋼管的外層很難被外部空氣和水侵蝕。只需管道內部水質杰出，使用壽命可達50多年，架空敷設的使用壽命是傳統溝渠的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，占地面積小，施工速度快，有利于環保。

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

直埋供熱管道不需要修建巨大的地溝，只需在地下埋設保溫管，大大減少了施工面積，減少土方開挖量50%以上，減少了土建砌體和混凝土量90%。一起保溫管加工與現場挖溝并行進行，只要現場接頭才能將施工周期縮短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 .安全。

5. Safety.

聚氨酯直埋保溫管設泄漏報警線，通知滲漏人員快速處理漏水管段，確保供熱管網安全運轉。

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.