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直埋供热管道采用硬质聚氨酯泡沫保温已很普遍，为进一步提高介质温度，以节约能源，取得显著经济效益，需要解决好管道的保温、防水等问题。本文介绍采用复合保温层的小试情况，并对保温方案进行了分析。
It is very common to use heat-insulated polyurethane foam to insulate heat pipes directly. In order to further increase the temperature of the medium to save energy and achieve significant economic benefits, it is necessary to solve problems such as insulation and waterproofing of pipes. This article describes the use of composite insulation layer of the small test situation, and analysis of the insulation program.