What is the thermal tightening temperature at the start-up of the device?
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What is the thermal tightening temperature at the start-up of the device? What does heat setting temperature refer to?
Due to the thermal expansion of metal materials, the flange and the bolts expand at different rates, which may cause the flange surface to loosen and lead to leaks. Generally, it is heat-tightened once at over 150 degrees, and again at over 250 degrees.
It refers to the process of retightening the bolts and nuts of flange connections once, when the equipment and pipelines are heated to a certain temperature during testing or operation, as the equipment is at a cold state during installation or maintenance.
To prevent leaks in high-temperature pipes, the bolts on these pipes must be tightened under heat after they are heated; the bolts on high-temperature pipes need to be tightened under heat every time the system is started up. Especially the bolts on the steam pipes.