How is flange thermal fastening accomplished?
Thread Content
After the equipment and pipelines are heated and pressurized, thermal tightening is required. Is it necessary to depressurize the system first before tightening the flanges during thermal tightening?
Equipment and pipelines need to be thermally tightened after heating and pressurization; there is no need to depressurize the system during this process
The heat tightening process does not require pressure release; it tightens directly
No need! For example, when a reboiler is put into use, the heat exchanger head must be thermally tightened after filling it; it’s not possible to remove the material from there again
Fastening requires not only temperature control but also pressure control; can fastening be achieved with high pressure?
Well, we’re performing thermal tightening while it’s in operation. . By pressure, you mean high system pressure, which needs to be relieved. I don’t know if there’s a big difference between high and low stress. Wait for others to reply
It’s hard to say exactly; for example, it is strictly prohibited by regulations to tighten ammonia gas-liquid pipelines under pressure... I also wonder whether gas-water pipelines can be tightened under pressure when there are differences in temperature and pressure This is too common
Is there a rule for this? At what temperature is it necessary to impose a lockout once?