What is the gasket factor 'm' used to determine in flange design?

• A. Required bolt load to maintain seal
• B. Gasket material hardness
• C. Bolt diameter
• D. Gasket seating temperature

Answer: (A)

The gasket factor m is a quantity used in the gasketed joint sealing equation to determine the bolt load needed to maintain a leak-tight seal. It represents how effectively the gasket material and geometry convert bolt preload into a seal under internal pressure. In flange design, you combine m with the gasket area and the operating pressure to calculate the minimum bolt preload required to prevent leakage. This concept is specifically about establishing the necessary bolt force to keep the joint sealed; it is not about gasket hardness, bolt diameter, or seating temperature.