The application of China's PE-RT pipeline in the field of cold and hot water pipelines in buildings has developed rapidly, and the raw materials have also been further developed. In 2002, the industry standard "Heat-resistant Polyethylene (PE-RT) Piping System for Hot and Cold Water" was released, but because the industry standard at that time referred to the German standard "Heat-resistant Polyethylene (PE-RT) Piping-General Quality Requirements" "And "Heat-resistant Polyethylene (PE-RT) Piping-Dimensions", these two standards are based on the performance indicators of Type I PE-RT materials. With the development of materials, the performance indicators of type II PE-RT materials are far higher than those of the first generation materials. The international standard ISO22391 "Heat-resistant Polyethylene (PE-RT) Piping System for Hot and Cold Water" has also been revised and updated. , Increasing the requirements for type II PE-RT pipes. [1]
With the development of materials, PE-RT pipes are updated and upgraded to PE-RTⅡ type pipes, which are divided into three types according to their comonomers:
1. Copolymerization of ethylene and octene-heat-resistant polyethylene (C2+C8);
2. Copolymerization of ethylene and hexene-heat-resistant polyethylene (C2+C6);
3. Heat-resistant polyethylene copolymerized with ethylene and butene (C2+C4)
The introduced (PE-RT Ⅱ type pipe) material is suitable for industrial and civil building cold and hot water pipeline systems, drinking water systems, thermal embedded pipes, ground radiant heating systems and high-temperature ground source heat pump systems, etc., especially in northern applications Used in the secondary pipe network of the urban heating system-PE-RT II type prefabricated direct-buried thermal insulation pipe.
