2 December 2022

APH Tube Failure

APH Tube Failure

How find the APH leakage?

Apply air or nitrogen pressure to the tube s, not exceeding the design working pressure, and swab the joints with a soap solution and watch for bubbles.

Any leakage will be readily apparent from both the pressure drop and the visible leakage (likely a spray), including the likely location of the leak. Finding and fixing will be much easier.

When fixing, just preheat that area with a fan-flame torch to burn off any dye without harming more fins that necessary before you start brazing process.

Reason for APH leakage :

1. Due point corrosion
2. Scaling inside the tube
3. Erosion in tube
4. Fire side corrosion.

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