Heat Exchanger Maintenance: Inspection, Testing, and Reliability Guide

Heat Exchanger Maintenance Overview

Heat exchanger maintenance is essential for reliable operation, maximizing equipment life, and maintaining thermal efficiency.

Inspection Procedures

External Inspection:
- Shell corrosion and damage
- Flange leakage
- Support condition
- Instrument calibration

Internal Inspection:
- Tube bundle examination
- Baffle condition
- Deposit accumulation
- Corrosion patterns

Testing Methods

Tube Testing:
- Eddy current testing (wall loss, pits)
- Ultrasonic (wall thickness)
- Remote visual inspection
- Hydrostatic testing

Eddy Current:
- Insert probe in each tube
- Compare to baseline
- Wall loss under 40% acceptable

Common Problems

Vibration Damage:
- Tube wear at baffles
- Reduce velocity or add supports
- Install vibration dampers

Leakage Issues:
- Re-expansion or welding
- Gasket replacement
- Tube plugs (temporary)

Preventive Schedule

Daily:
- Operating parameters
- Visible leaks, noises

Monthly:
- Bolt tightness
- Gasket inspection
- Instrument verification

Annual:
- Open and inspect
- Tube testing
- Replace gaskets
- Clean bundle

Documentation

Essential Records:
- Nameplate data
- Test reports
- Inspection reports
- Maintenance history
- Operating logs

Retention: Equipment life plus 5 years

Conclusion

Heat exchanger maintenance combines inspection, testing, and prevention. Well-maintained units deliver reliable performance.