Condensate outlet pipeline of steam heating equipment (such as oil tank heater and heat exchanger);
The lower part of the steam separator and the flash tank;
The end or lowest point of saturated steam pipeline, the lower end of riser and steam pipe network every 200 ~ 300 m;
The lower part of the steam distribution pipe;
Pressure reducing valve or (and) regulating valve in front of steam pipeline;
End of steam tracing pipe.