Pipeline welding
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Pressure inside the tube: 2. 0Mpa, pipe diameter 89*5. 4. Is it safe to perform welding externally on the pipe wall when the internal medium is gasoline? Urgently need an answer
It’s definitely not safe anymore; it’s better to drain the gasoline, purge it first, and then carry out welding
When performing pressure-containing hole opening, pressure welding is often required. But I’m not sure if such high pressure is okay?
The chemical plant, and the hot work team, won’t agree to it. Danger!
It is generally not allowed to carry out maintenance on equipment while it is under pressure; in a situation like the one described by the poster, this should indeed be prohibited. It is best to empty the pipes before welding
It’s definitely not possible; after all, it’s a flammable substance. Safety comes first. Our factory has experienced similar accidents – welding work was carried out on methanol tanks without proper analytical tests after they had been washed. As a result, the tanks exploded and people lost their lives. No one wants such things to happen. I advise my colleagues to take all necessary precautions when working with such materials. Safety first! !
I advise you that doing this is too dangerous; it’s definitely not safe. You can use a pressure-sealing clamp instead. I also work in a chemical plant, where I am frequently exposed to such flammable and explosive pipelines; however, professional tools are necessary
Safety first – when working on flammable and explosive pipelines, no one can guarantee that no accidents will occur. If it’s not possible to seal the leak while the pipeline is under pressure, then it’s necessary to stop operations, remove the material from the pipeline, clean it thoroughly, and conduct tests to ensure safety before proceeding with work. Alternatively, it’s safer to stop operations and remove a section of the pipeline before carrying out any work.
Thank you all for your suggestions; this leak has been fixed by welding a cover outside, which prevented an unplanned shutdown. During the discussions, it was taken into account that 1) the gasoline inside the pipes contains no air or oxygen, so it does not form an explosive mixture and will not catch fire. 2. The penetration depth during spot welding is 2. 0mm, 89*3. The pressure rating for 4 pipes is 2. Above 0Mpa. 3. During welding, nitrogen is filled inside the sleeve for displacement, preventing the formation of explosive gases. It is relatively safe to get involved, despite certain risks.