Consider replacing flanges under the following conditions:
• Flange is near the ASME tmin for the operating conditions.
• Flange is so badly corroded the repair costs are greater than or equal to the replacement costs.
• Flange is rotated causing the gasket not to seat properly.
• The right gasket cannot be used because of flange configuration problems.
• Flange is a chronic leaker. ASME flange design may not be adequate.