Hot work on hydrogen pipelines – please provide corrections
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This post was last edited by Zizai Youyu-Xu on 2011-8-16 at 10:12. Welding work on hydrogen pipelines: A DN100 hydrogen branch pipe was connected to the hydrogen main pipeline; during leak testing, it was found that there was a leak in the pipe behind the flange at the connection to the main hydrogen pipeline, and then a welder was used to repair the leak. Fire prevention measures: (1) Disconnect the flange and install a blind plate. (2) The DN100 hydrogen pipeline is not in use, with no flammable gases present. (3) Connect the welding machine to the power source as close as possible. (3) The analysis near the main pipe is satisfactory. (4) The hydrogen main pipe is in continuous operation with no signs of leakage. (5) Operators must strictly follow the safety operating procedures. (6) Safety officers and fire supervisors are in place. Because it is very close to the hydrogen main pipe, fire work must be carried out with caution. However, there are still some shortcomings with this ignition process; please feel free to point them out.
It’s best to take that section of pipe out and weld it separately!
1. The pipeline where welding is to be carried out must be completely separated from the pipeline in use. 2. The pipelines where welding will take place need to be purged, preferably with nitrogen, and samples taken for analysis to confirm compliance. 3. Isolate the system at both ends of the pipeline where welding will take place; with these three points met, it’s sufficient, as all the blind flanges that need to be installed on the main pipes have been added.
It must be disconnected from it; even when in use, there can be leaks. Purge with nitrogen for 12 hours, and conduct a hot work analysis to verify that it is satisfactory before proceeding with hot work.
Whether the pipeline is in use or not, a hot work analysis must be conducted, and work may only proceed once it is approved.
Although the DN100 hydrogen pipeline is not in use, it still needs to be purged with nitrogen, and the sample analysis showed satisfactory results. The work is a bit tricky; some tasks may seem like unnecessary hassle, but don’t rely on luck. The disconnected one is disconnected; the blind plate is a blind plate. Wish all my colleagues who are working hard to ensure safe production a year of safety! Work is going well! !
Pipelines exposed to fire are continuously purged with nitrogen, while fire trucks remain on standby at their positions
It is protected with nitrogen inside the pipeline; it can be sealed with a wet cloth, with the interior filled with nitrogen at a slight positive pressure