The paper introduces the craft principle for the electric preheating of the long-distance heat-supply pipelines,illustrates its construction points from the excavation of the working pits,the welding of the one-off compensators,installation of the temperature sensor,and connection between the preheating equipment and pipelines,and points out the electric preheating is featured with higher safety,stronger flexibility,and obvious economic beneftis.%介绍了长输供热管道电预热的工艺原理,从工作坑开挖、一次性补偿器焊接、温度传感器安装、预热设备与管道连接等方面,阐述了管道电预热施工要点,指出电预热具有安全性高、灵活性强、经济效益显著等优势.
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