How to purge a lubricating oil hydrogenation unit when it is shut down

During shutdowns, the lubricating oil hydrogenation unit requires purging of the side lines of the vacuum tower in order to remove residual substances from the pipelines and ensure safe operation. The specific steps are as follows: 1. Close the valves of the feed system and the discharge system to ensure that there is no liquid flow in the pipes. 2. Connect compressed air to the side line of the pressure reduction tower to purge the pipeline. It should be noted that the air flow rate and pressure need to be increased gradually, in order to avoid liquid splashing inside the pipes or pipe damage caused by an excessively large flow rate at once. 3. Purge section by section based on the pipeline length and the number of elbows, paying special attention to the cleaning of the bottom of the pressure reduction tower and the bottom discharge pipelines. 4. After the purging is complete, open the valves of the feed system and the discharge system to conduct a leak check, and ensure that there are no impurities or residual substances in the pipes. 5. After the operation is completed, conduct timely inspections and maintenance on the equipment to ensure its long-term stable operation. The above are the methods for operating the vacuum tower side stream during the shutdown of the lubricating oil hydrogenation unit; they are provided for reference only. The actual operations must take into account the characteristics of the equipment itself as well as safety requirements. .