聚氨酯保温钢管在热力管道中的劣势
Disadvantage of Polyurethane Thermal Insulation Pipe in Thermal Pipeline
1、降低工程造价据有关部门测算，普通状况下聚氨酯保温钢管可以降低工程造价的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。
1. According to the calculation of relevant departments, polyurethane insulating steel pipe can reduce the project cost by 25% (using FRP as maintenance layer) and 10% (using high density polyethylene as maintenance layer) under normal conditions.
2、热损耗低，浪费动力聚氨酯导热系数爲：λ=0．013—0．03kcal/m·h·oC，比其他过来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，约爲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，加上保温层和里面防水功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，大大增加了供热管道的全体热损耗，热网热损失爲2%，远远小于10%的规范要求。
2. Low heat loss, waste power polyurethane thermal conductivity: lambda = 0.013-0.03kcal/m.h.oC, much lower than other commonly used pipeline thermal insulation data, thermal insulation effect 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 insulation layer and waterproof high-density polyethylene or fiberglass reinforced plastics maintenance shell, have changed the traditional trench laying of heating pipeline "wearing wet cotton jacket", greatly increased the overall heat loss of heating pipeline, heat loss of heating network is 2%, far less than the international norms of 10%.
3、防腐蚀、绝缘功能好，运用寿命长 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、绝缘和机械功能。因而，任务钢管外皮很舒服到外界空气和水的腐蚀。只需管道外部水质处置好，据国外材料引见，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。
3. Anticorrosion, good insulation function and long service life. The polyurethane rigid foam insulation layer is tightly bonded to the outer skin of the steel pipe, and the air and water infiltration can be isolated. 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 functions. Therefore, the outer skin of the task steel pipe is very comfortable to the corrosion of the outside air and water. According to foreign materials, the service life of the pipeline can reach more than 50 years, which is 3-4 times longer than that of traditional trench laying and overhead laying.
In summary, all the above-mentioned Shandong Hipper Pipe Technology Development Co., Ltd. provides, want to know more about polyurethane insulation pipe manufacturers, welcome to pay attention to our website: http://www.sdhpgy.com Thank you for your support!
