1、降低工程造价。
1. Reduce the cost of construction.
据有关部门测算，双管制供热管道，普通状况下能够降低工程造价的25%（采用玻璃钢做维护层）和10%（采用高密度聚乙烯做维护层）左右。
According to the calculation of relevant departments, double-pipe heating pipeline can reduce the cost of construction by 25% (using FRP as maintenance layer) and 10% (using high density polyethylene as maintenance layer) under normal conditions.
2 热损耗低，节约能源。
2. Low heat loss and energy saving.
直埋式保温管其导热系数为：λ=0．013—0．03kcal/m·h·oC，比其他过去常用的管道保温资料低得多，保温效果进步4~9倍。再有其吸水率很低，约为0．2kg/m2。吸水率低的缘由是由于聚氨酯泡沫的闭孔率高达92%左右。低导热系数和低吸水率，加上保温层和外面防水性能好的高密度聚乙烯或玻璃钢维护壳，改动了传统地沟敷设供热管道“穿湿棉袄”的情况，大大减少了供热管道的整体热损耗，热网热损失为2%，小于10%的规范请求。
The thermal conductivity of directly buried heat preservation pipes is 0.013-0.03kcal/m.h.oC, which is much lower than other commonly used heat preservation data in the past, and the heat preservation effect is improved by 4-9 times. And its water absorption is very low, about 0.2 kg/m2. The reason for low water absorption is that the polyurethane foam has a closed porosity of about 92%. Low thermal conductivity and low water absorption, together with high density polyethylene (HDPE) or fiberglass reinforced plastics (FRP) maintenance shell with good insulation layer and external waterproofing performance, have changed the situation of traditional trench laying heating pipeline "wearing wet cotton jacket", greatly reducing the overall heat loss of heating pipeline, heat loss of heating network is 2%, less than the international standard requirements of 10%.
3、防腐，绝缘性能好，运用寿命长。
3. Anti-corrosion, good insulation performance and long service life.
直埋式保温管由于聚氨酯硬质泡沫保温层严密地粘结在钢管外皮，隔绝了空气和水的渗入，能起到良好的防腐作用。同时它的发泡孔都是闭合的，吸水性很小。高密度聚乙烯外壳、玻璃钢外壳均具有良好的防腐、绝缘和机械性能。因而，工作钢管外皮很难遭到外界空气和水的腐蚀。只需管道内部水质处置好，据国外材料引见，直埋式保温管的运用寿命可达50年以上，比传统的地沟敷设、架空敷设运用寿命高3~4倍。
The directly buried insulation pipe is tightly adhered to the outer skin of the steel pipe because of the rigid polyurethane foam insulation layer, which can isolate the infiltration of air and water, and can play a good anti-corrosive effect. At the same time, its foaming holes are closed and its water absorption is very small. High density polyethylene shell and FRP shell have good anti-corrosion, insulation and mechanical properties. Therefore, it is very difficult for the outer skin of the working steel pipe to be corroded by the outside air and water. According to foreign materials, the service life of directly buried insulation pipe can reach 50 years, which is 3-4 times longer than that of traditional trench laying and overhead laying.
4．占地少，施工快，有利环境维护和减少施工扰民。
4. It occupies less land, constructs quickly, maintains favorable environment and reduces construction disturbance to the people.
直埋供热管道不需求砌筑庞大的地沟，只需将保温管埋人公开，因而大大减少了工程占地，减少土方开挖量约50%以上，减少土建砌筑和混凝土量90%。同时，保温管加工和现场挖沟平行停止，只需现场接头，能够大幅度缩短工期。由于减少了砖、水泥、砂石、余土等的运输，从而减少了施工过程中汽车尾气排放量、扬尘量、噪声排放量，从而维护了环境。
Directly buried heating pipelines do not need to build huge trenches. They only need to bury insulating pipes openly, 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%. At the same time, the processing of insulating pipes and digging ditches on site are stopped in parallel, only the on-site joints are needed, which can greatly shorten the construction period. Because the transportation of bricks, cement, sand and gravel, residual soil, etc. is reduced, the emission of automobile exhaust, dust and noise in the construction process are reduced, thus the environment is maintained.
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