The ANSI flange is a dynamic joint which, when bending forces and tensile loads are applied, become loose and weak.

• Complex bolting requiring complex bolting equipment - Result : High Cost.
• Large flange diameters are difficult to work with, require more space and result in a complex handling
• Gap created by raised face introduces corrosion problems
• Large bolt forces to maintain gasket integrity
• Excessive costs for large flange diameters in exotic materials
• Regular re-tightening incurs increased life cycle costs