The polyurethane direct buried heat preservation pipe is a direct buried preheating heat preservation pipe with good heat preservation performance, safety and reliability, and low engineering cost. The buried thermal insulation pipe not only has the advanced technology and practical performance that is difficult to compare with the traditional trench and overhead laying pipeline, but also has obvious social and economic benefits, and is also a powerful measure for heating and energy saving. The prefabricated direct buried thermal insulation pipe adopts the direct buried heating pipeline technology, which indicates that the development of China’s heating pipeline technology has entered a new starting point. With the world’s energy reduction and increasing demand, energy conservation, emission reduction and environmental protection have become the global development trend. The state and local governments also vigorously promote the development, application and industrialization of energy conservation, emission reduction and environmental protection products. The use of polyurethane rigid foam insulation is an important branch of the polyurethane industry. It is characterized by a multi-purpose use to prevent the spread of fire and good fire safety performance. Black jacket insulation pipe includes spiral steel pipe, straight seam steel pipe and无缝钢管。外层由黑色聚乙烯制成，称为黑套绝缘管。聚氨酯保温管速度快。这种现象通常发生在春夏或中午施工，因为温度突然上升，温度过高。黑色材料可以用冷水冷却，或者晚上放置在室外以避免阳光直射。泡沫强度小，泡沫柔软。这种现象是由黑白材料比例不平衡造成的。适当增加黑色料的比例(1:1-1.05)。注意黑色材料的比例不要太大，否则泡沫会变脆。它也会影响泡沫的性能。

　　As the only new building materials for thermal insulation and waterproof integration, the application of polyurethane rigid foam insulation materials in the domestic construction industry is still in the initial stage. Fortunately, in order to speed up the innovation of building insulation materials and promote the promotion and application of polyurethane rigid foam in the field of building energy conservation, the Ministry of Construction has specially established the “Polyurethane Building Energy Saving Application Working Group” to promote the energy saving of polyurethane rigid foam insulation materials in China’s industry applications.

聚氨酯发泡保温钢管具有突出的优点：

　　Polyurethane foam insulation steel pipe has good insulation performance, and the heat loss is only 25% of the traditional pipe. Long-term operation can save a lot of energy and significantly reduce energy costs.

　　Polyurethane foam insulation steel pipe has strong waterproof and腐蚀抵抗性。它并不需要配备管沟内。它可直接埋入地下或水中。施工简便，快速，综合成本低。

　　Polyurethane foam insulation steel pipe also has good corrosion resistance and impact resistance under low temperature conditions, and can be directly buried in underground frozen soil.

　　Proper installation and use of polyurethane foam insulation steel pipe can make pipe network maintenance costs extremely low.

　　The polyurethane foam insulation steel pipe can be equipped with an alarm system to automatically detect the leakage of the pipe network, accurately indicate the fault location and automatically alarm.

　　The service life of polyurethane foam insulation steel pipe can reach 30-50 years. Pipe diameter: DN15–DN600 Thickness: 15-50mm Uses: Central heating pipes, refrigeration pipes, industrial pipes, etc.

　　Oxygen index of polyurethane foam insulated steel pipe: ≥27 Density: 40–70kg/cubic m Water-repellent rate: 0.03kg/cmcm Thermal conductivity: 0.022kcal/mh°C