Before installing a gasket, which two items should be checked on the flange?

Before installing a gasket, which two items should be checked on the flange?

• A. Size and rating stamped on the flanges
• B. Material type
• C. Color
• D. Date of manufacture

Answer: (A)

Check the flange size and its pressure rating stamped on the flange before installing a gasket. The size tells you the nominal pipe size and matches the gasket bore and bolt pattern, ensuring a proper mechanical fit. The pressure rating indicates the class the flange is designed for, guiding gasket material choice and bolt loading so the joint can safely handle the system pressure. If either the size or the rating is incorrect, the gasket won’t seal properly and the joint could fail under pressure. Other details like material type, color, or date of manufacture aren’t used to determine the gasket fit or performance at installation, though they may matter for corrosion considerations or traceability.

Check the flange size and its pressure rating stamped on the flange before installing a gasket. The size tells you the nominal pipe size and matches the gasket bore and bolt pattern, ensuring a proper mechanical fit. The pressure rating indicates the class the flange is designed for, guiding gasket material choice and bolt loading so the joint can safely handle the system pressure. If either the size or the rating is incorrect, the gasket won’t seal properly and the joint could fail under pressure. Other details like material type, color, or date of manufacture aren’t used to determine the gasket fit or performance at installation, though they may matter for corrosion considerations or traceability.