Venting of low pressure gas locations

Thread Content

During the recent equipment maintenance, the low-pressure gas system was purged yesterday and the process was opened up. When the high-altitude venting was turned on, there was some residual oil (I guess it was naphtha). However, after looking at the entire low-pressure gas pipeline, there was no venting anywhere, and venting from high altitudes would spray oil all over the place. It will cause pollution. After discussing with the production director, we decided to open the last burner connection where the low-pressure gas enters the furnace, and then purge it. When steam was seen at this connection for half an hour, oil was still sprayed out after opening the vent at a high place. The amount of oil was very small. I wonder if anyone has encountered such a problem and how to solve it? Also, can the low-pressure gas system be vented at a designed location? Why? I guess the oil coming out of the low-pressure gas system is because the gas is relatively dirty. After a long period of silence, there is sedimentation on the pipe wall. When the steam is introduced, it is blown to the back and emptied. But how should this residual oil be connected? I still can't figure it out, I hope someone can give me some advice!