聚氨酯保温管施工特点
Construction Characteristics of Polyurethane Thermal Insulation Pipe
1.下降工程造价
1. reduce project cost
据有关部门测算，双管制供热管道，一般情况下能够下降工程造价的25%(选用玻璃钢做保护层)和10%(选用高密度聚乙烯做保护层)左右。
According to the calculation of relevant departments, the cost of double-pipe heating pipeline can generally be reduced by 25% (using FRP as protective layer) and 10% (using high-density polyethylene as protective layer).
2.热损耗低，节约能源
2. Low Heat Loss and Energy Conservation
高温预制直埋保温管其导热系数为：λ=0.013-0.03kcalm·h·oC，比其他过去常用的管道保温材料低得多，保温效果提高4~9倍。再有其吸水率很低，约为0.2kgm2。吸水率低的原因是因为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功能好的高密度聚乙烯或玻璃钢保护壳，改变了传统地沟敷设供热管道“穿湿棉袄”的情况，大大削减了供热管道的整体热损耗，热网热损失为2%，小于10%的标准要求。
The thermal conductivity of high temperature prefabricated directly buried insulating pipe is as follows: lambda = 0.013-0.03kcalm 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. And its water absorption is very low, about 0.2 kgm2. The reason of low water absorption is that the obturator rate of polyurethane foam is as high as 92%. Low thermal conductivity and low water absorption, together with high density polyethylene or fiberglass reinforced plastic protective shell with good insulation layer and external waterproof function, have changed the situation of traditional trench laying heating pipeline "wearing wet cotton jacket", greatly reduced the overall heat loss of heating pipeline, heat loss of heating network is 2%, less than the international standard requirement of 10%.
3.防腐，绝缘功能好，运用寿命长
3. Anti-corrosion, good insulation function, long service life
高温预制直埋保温管因为聚氨酯保温管保温层紧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。一起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，作业钢管外皮很难遭到外界空气和水的腐蚀。只要管道内部水质处理好，据国外资料介绍，高温预制直埋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。
High-temperature prefabricated direct-buried insulating pipe has good anti-corrosion effect because the insulating layer of polyurethane insulating pipe is tightly bonded to the outer skin of steel pipe, which isolates the infiltration of air and water. Together, its foam 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, it is very difficult for the outer skin of the working steel pipe to be corroded by the outside air and water. As long as the internal water quality of the pipeline is well treated, according to foreign information, the service life of the high temperature prefabricated directly buried insulation pipe can reach more than 50 years, which is 3-4 times longer than that of the traditional trench laying and overhead laying.
4.占地少，施工快，有利环境保护
4. It occupies less land, constructs quickly, and is beneficial to environmental protection.
直埋供热管道不需要砌筑巨大的地沟，只需将保温管埋人地下，因而大大削减了工程占地，削减土方开挖量约50%以上，削减土建砌筑和混凝土量90%。一起，保温管加工和现场挖沟平行进行，只需现场接头，能够缩短工期约50%以上,预制直埋保温管广泛用于液体、气体的运送管网，化工管道保温工程石油、化工、集中供热热网、空调通风管道、市政工程等。直埋保温管是一种保温功能好，加可靠，工程造价低的直埋预制保温管。有用的了乡镇集中供热中130℃－600℃高温输热用预制直埋保温管的保温、滑动光滑和裸露管端的防水问题。直埋保温管不只具有传统地沟和架空敷设管道难以比较的技术、有用功能，并且还具有显著的社会效益和经济效益，也是供热的有力办法。预制直埋保温管选用直埋供热管道技术，标志着供热聚氨酯保温管技术发展现已进入了新的起点。
Directly buried heating pipelines do not need to build huge trenches. They only need to bury heat preservation pipelines 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%. Together, heat preservation pipe processing and digging ditches are carried out in parallel with each other. Only field joints can shorten the construction period by more than 50%. Prefabricated directly buried heat preservation pipes are widely used in liquid and gas transportation network, chemical pipeline heat preservation engineering petroleum, chemical industry, central heating and heating network, central air conditioning and ventilation pipeline, municipal engineering, etc. Direct buried insulation pipe is a kind of prefabricated insulation pipe with good thermal insulation function, safety and reliability, and low cost. The problems of heat preservation, smooth sliding and waterproofing of bare pipe ends of prefabricated directly buried insulating pipes for heat transfer at 130-600 (?) C in Township Central heating are solved. Direct buried insulation pipe not only has advanced technology and useful functions that are difficult to compare with traditional trench and overhead pipeline laying, but also has significant social and economic benefits, and is also a powerful way to save energy for heating. The prefabricated direct buried insulation pipe adopts the technology of direct buried heating pipe, which indicates that the development of polyurethane insulation pipe technology for heating in China has entered a new starting point.
聚氨酯保温管壳：用于室内外各种管道，空调管道、化工、医药等工业管道的保温、保冷。
Polyurethane insulation pipe shell: used for indoor and outdoor pipelines, central air-conditioning pipelines, chemical industry, medicine and other industrial pipelines to keep warm and cold.
选用高功能聚醚多元醇和多次甲基多苯基多异氰酸酯为主要原料，在催化剂、发泡剂、表面活性剂等作用下，经化学反映发泡而成
Highly functional polyether polyols and polymethylene polyphenyl polyisocyanate were selected as the main raw materials, and foamed by chemical reaction under the action of catalyst, foaming agent and surfactant.
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