A weather seal is constructed in order to prevent the risk of high temperature flanges leaking during rain, for example, due to a temperature difference between the flanges and their bolts. From the point of view of saving energy, an adequate scal is essential to reduce the amount of heat that dissipates from the flange. However, the better the seal makes the greater the bolt temperature increase, and hence, the higher the risk of leakage. Thus there is a great demand for an optimal seal design.

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