What should be done to properly fit a new gasket to a flange?

To properly fit a new gasket to a flange, it is essential to remove excess gasket material by trimming. This ensures that the gasket fits snugly within the flange without overhang or undue stress. When a gasket is too large, it can interfere with the proper sealing function and may lead to leaks or other failures. Trimming the gasket helps maintain a proper sealing surface, allowing the flange to be properly torqued and ensuring that fluids do not escape.

Using extra adhesive could lead to complications, as it might create a scenario where the gasket is overly bonded, making future removal difficult. Heating a gasket prior to installation is generally not advised, as it can alter the material properties or dimensions of the gasket, risking an improper fit. Leaving the gasket without modifications is not recommended, as it likely would not create a reliable seal due to size or fit issues.