All gaskets used on flanges for gas must be full face for what type of flange material?

All gaskets used on flanges for gas must be full face for what type of flange material?

• A. Bronze and cast iron
• B. Steel
• C. Aluminum
• D. Copper

Answer: (A)

Full-face gaskets are used on gas-flange joints made from bronze or cast iron because these materials are softer and more prone to surface imperfections. Using a full-face gasket distributes sealing pressure across the entire flange face, compensating for minor irregularities and ensuring a uniform seal that prevents leaks around the edges or at bolt holes. Steel flanges, often machined with a raised-face, can reliably seal with standard gaskets without needing a full-face gasket.

Full-face gaskets are used on gas-flange joints made from bronze or cast iron because these materials are softer and more prone to surface imperfections. Using a full-face gasket distributes sealing pressure across the entire flange face, compensating for minor irregularities and ensuring a uniform seal that prevents leaks around the edges or at bolt holes. Steel flanges, often machined with a raised-face, can reliably seal with standard gaskets without needing a full-face gasket.