The mating flanges are pre-installed on the equipment flanges; can the flanges and pipes be welded on-site without removing them?
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There are flanges on the equipment; matching flanges are installed before leaving the factory, and these flanges are buttwelded flanges. Since disassembly affects the seal, can the flange not be removed on-site, and can the steel pipe be welded to the already installed flange? Is that okay? If possible, where are the relevant regulations? No, please let the expert also explain why.
If you don’t remove the flange and weld directly, will the high temperature of welding affect the seal of the flange? It’s okay as long as it doesn’t cause any problems, right? I can’t think of any others for now
American standard butt weld flanges, with a very high weld neck and thick thickness as well. It seems so too; the temperature must be high, but I don’t think it will be that extremely high
Are there a lot of typos in your question? It’s a bit confusing to read
First, check the temperature that the seal can withstand, and then ask the welding engineer about the expected temperature. Try to get a rough estimate first; also, consider whether post-weld heat treatment is necessary, as that will also result in high temperatures.
It is possible as long as the seal is not affected
Well, it seems so; basically, what it means is that the mating flanges allow the steel pipes to be welded after installation?
Since it is for export, I’m not sure if there is any basis for this. Could you tell me which standard it is?
First of all, thank you for your analysis. I’ll go check it. Rubber R01 for sealing.
It seems that I really haven’t noticed any evidence for this
Generally speaking, it would be better to weld the flanges on the pipelines first, and then install the equipment or valves, etc