聚氨酯保溫鋼管在熱力管道中的劣勢
Disadvantage of Polyurethane Thermal Insulation Pipe in Thermal Pipeline
1、降低工程造價據(jù)有關(guān)部門測算，普通狀況下聚氨酯保溫鋼管可以降低工程造價的25%（采用玻璃鋼做維護層）和10%（采用高密度聚乙烯做維護層）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、熱損耗低，浪費動力聚氨酯導(dǎo)熱系數(shù)爲(wèi)：λ=0．013—0．03kcal/m·h·oC，比其他過來常用的管道保溫資料低得多，保溫效果進步4~9倍。再有其吸水率很低，約爲(wèi)0．2kg/m2。吸水率低的緣由是由于聚氨酯泡沫的閉孔率高達92%左右。低導(dǎo)熱系數(shù)和低吸水率，加上保溫層和里面防水功能好的高密度聚乙烯或玻璃鋼維護殼，改動了傳統(tǒng)地溝敷設(shè)供熱管道“穿濕棉襖”的情況，大大增加了供熱管道的全體熱損耗，熱網(wǎng)熱損失爲(wèi)2%，遠遠小于10%的規(guī)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、防腐蝕、絕緣功能好，運用壽命長 由于聚氨酯硬質(zhì)泡沫保溫層嚴密地粘結(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、絕緣和機械功能。因而，任務(wù)鋼管外皮很舒服到外界空氣和水的腐蝕。只需管道外部水質(zhì)處置好，據(jù)國外材料引見，運用壽命可達50年以上，比傳統(tǒng)的地溝敷設(shè)、架空敷設(shè)運用壽命高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.
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