Hot work on pipelines
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How is work involving hot work on the pipelines of pressure relief devices typically handled? It’s not light oil (gasoline or diesel)
First, perform displacement, then use nitrogen purging to remove any residual oil inside. After that, disconnect the flanges of the relevant equipment or install blind flanges, and carry out steam purging for 8 hours. Work can proceed with flame ignition only after combustible gas levels have been checked
Make sure the valve connected to the tower wall can be closed tightly to prevent air from flowing back in
Thoroughly isolate the hot work area from other equipment and pipelines, install blind flanges, and treat the pipelines and equipment before carrying out hot work.
The eight-key principles for working with fire: reduce temperature and pressure, isolate the area, and implement proper fire prevention measures on site before starting work with fire.
The area where welding will take place must be completely isolated from the equipment; if possible, use blind flanges. The oil stored in the pipelines should be blown out, and the areas should be steamed for a day. Ashbestos should be laid in the surface ditches and wells, followed by the application of sand. Before welding, combustible gases should be analyzed, and the area should be covered with a small amount of steam to ensure safety
I agree with everyone’s view: a thorough purge is sufficient, the blind flange on the flange can be removed, and as long as the monitoring results are satisfactory, there is no need for nitrogen purging
Replace it thoroughly with steam, then add a blind flange to isolate it from the system – that’s all