Reasons for heat tightness

Heat tightening refers to raising equipment to a certain temperature before using equipment with a relatively high operating temperature. Under this condition, all sealing surface bolts and other fasteners are re-tightened. Thermal tightness can effectively avoid equipment leakage caused by thermal expansion and contraction. Because equipment is generally installed at room temperature, and when the temperature of equipment working at high temperatures rises, there will be significant thermal expansion and contraction. At this time, because the materials of the fasteners are often inconsistent with the equipment body, resulting in inconsistent thermal expansion, it often happens that the sealing surface does not leak at low temperatures, but leaks when the temperature rises. Performing tightening operations again after the equipment reaches a certain temperature can effectively prevent this phenomenon from occurring.

What I said upstairs makes a lot of sense - to prevent leakage! I think it is because the heat transfer coefficients and expansion coefficients of fasteners and seals are different. The purpose of constant temperature at this temperature is to synchronize the two, and then tighten the bolts to prevent leakage! :handshake