| 摘要 |
A device for protection of pipeline against defreezing includes tubes filled with water. From above at the whole lengths of the tubes a spiral insulation is laid, with separation not larger than , made of heating resistive cables with constant resistance, whose outer shells are made of a thermo-stable plastic, those comprise an end cast hermetic socket, a long flat heating cable. Each line is screened with a copper screen, connecting the cast hermetic socket to a built-in thermo-controller, there a network cable is built in, of power cable with a cast euro-plug at the end. |
