Final answer:
To remove a gasket from a flange, all bolts should be removed to release the compressive force and prevent damage.
Step-by-step explanation:
The removal of a gasket from a flange typically requires the removal of all bolts. Flanges are designed to create a tight seal via the compressive force applied evenly across the gasket by the bolts. Without removing all bolts, this pressure remains on the gasket, making it difficult or impossible to remove without potential damage to the flange surface or the gasket itself. In the practice of flanged joint assembly and maintenance, ensuring all hardware is removed allows for safe and proper service.