Aflex Metal Bellows Maintenance Procedures

Metal bellows assemblies are designed for long-term operation under specified conditions with minimal intervention. When installed and operated within design parameters, bellows are generally considered maintenance-free. However, periodic
inspections are recommended to ensure continued safe operation and to identify any signs of abnormal wear, damage, or environmental factors that may affect performance.

General Guidelines

• Bellows assemblies require no routine maintenance under normal operating conditions.
• Scheduled visual inspections should form part of the site’s general piping or plant maintenance routines.
• Maintenance actions are typically limited to inspection and ensuring surroundingequipment does not impose unexpected loads or movements on the bellows.

Inspection Procedure

Recommended Frequency:
Visual inspection during routine shutdowns or at least annually, unless site conditions suggest otherwise.

Inspection Steps:

1. Visual Examination:
   1. Inspect bellows convolutions for deformation, cracks, corrosion, or leaks.
2. Attachment Points:
   1. Check welds, flanges, and tie rods for cracks, corrosion, or loose fasteners.
3. Alignment and Supports:
   1. Verify pipe alignment remains within design tolerances. Confirm supports are intact.
4. Movement Check:
   1. Ensure bellows are free to absorb designed movement and are not restricted.
5. Protective Components:
   1. Inspect liners, covers, and insulation for damage or corrosion.

Corrective Actions

• If leaks, cracks, severe deformation, or excessive corrosion are detected:
  • Isolate the system.
  • Replace the bellows assembly (bellows are generally non-repairable components).
• If alignment or support issues are identified:
  • Rectify pipe misalignment or faulty supports before restarting the system.

Operational Considerations

• Ensure system pressure, temperature, and movement stay within the bellows design limits.
• Avoid excessive vibration, torsional loads (unless designed for torsion), or overextension beyond rated movement.

Record Keeping

• Document inspection findings, including:
• Date of inspection
• Observations
• Corrective actions (if any)
• Retain inspection records as part of the plant maintenance log.

Important Notes

• Bellows are not designed for field modification.
• If damage or defects are suspected, consult the manufacturer before attempting repairs or replacements.
• Replacement bellows should match the original design specifications to maintain system integrity.