1、降低工程造價。 據(jù)有關(guān)部門測算，雙管制供熱管道，一般情況下可以降低工程造價的25%（采用玻璃鋼做保護(hù)層）和10%（采用高密度聚乙烯做保護(hù)層）左右。
1. Reduce project cost. According to the calculation of relevant departments, the double pipe heating pipeline can reduce the project cost by about 25% (using FRP as the protective layer) and 10% (using HDPE as the protective layer) in general.
2 熱損耗低，節(jié)約能源。
2. Low heat loss and energy saving.
預(yù)制聚氨酯直埋保溫管其導(dǎo)熱系數(shù)為：λ=0．013—0．03kcal/m·h·oC，比其他過去常用的管道保溫材料低得多，保溫效果提高4~9倍。再有其吸水率很低，約為0．2kg/m2。吸水率低的原因是由于聚氨酯泡沫的閉孔率高達(dá)92%左右。低導(dǎo)熱系數(shù)和低吸水率，加上保溫層和外面防水性能好的高密度聚乙烯或玻璃鋼保護(hù)殼，改變了傳統(tǒng)地溝敷設(shè)供熱管道“穿濕棉襖”的狀況，大大減少了供熱管道的整體熱損耗，熱網(wǎng)熱損失為2%，小于10%的標(biāo)準(zhǔn)要求。
The thermal conductivity of prefabricated polyurethane direct buried insulation pipe is λ = 0.013-0.03kcal/m · h · OC, which is much lower than other commonly used pipeline insulation materials in the past, and the insulation effect is increased by 4-9 times. Moreover, its water absorption is very low, about 0.2kg/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 thermal insulation layer and high-density polyethylene or fiberglass protective shell with good waterproof performance, have changed the situation of "wet padded jacket" of traditional heat supply pipeline laid in trench, greatly reducing the overall heat loss of heat supply pipeline. The heat loss of heat supply network is 2%, which is less than the international 10% standard requirements.
3、防腐，絕緣性能好，使用壽命長。
3. Anticorrosion, good insulation and long service life.
預(yù)制聚氨酯直埋保溫管由于聚氨酯硬質(zhì)泡沫保溫層緊密地粘結(jié)在鋼管外皮，隔絕了空氣和水的滲入，能起到良好的防腐作用。同時它的發(fā)泡孔都是閉合的，吸水性很小。高密度聚乙烯外殼、玻璃鋼外殼均具有良好的防腐、絕緣和機(jī)械性能。因此，工作鋼管外皮很難受到外界空氣和水的侵蝕。只要管道內(nèi)部水質(zhì)處理好，據(jù)國外資料介紹，預(yù)制聚氨酯直埋保溫管的使用壽命可達(dá)50年以上，比傳統(tǒng)的地溝敷設(shè)、架空敷設(shè)使用壽命高3~4倍。
The rigid polyurethane foam insulation layer is tightly bonded to the outer surface of the steel pipe, and the air and water infiltration can be isolated from the prefabricated polyurethane insulation pipe. At the same time, its foam pores are closed and its water absorption is very small. HDPE shell and FRP shell have good anticorrosion, insulation and mechanical properties. Therefore, the outer skin of the working steel pipe is hard to be eroded by the outside air and water. As long as the internal water quality of the pipeline is well treated, according to foreign data, the service life of the prefabricated polyurethane direct buried insulation pipe can be more than 50 years, 3-4 times longer than that of the traditional trench laying and overhead laying.
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