Exam Question

A waste heat boiler experiencing persistent leakage at the tube/tube plate connection is a critical issue requiring immediate and effective permanent repair to ensure continued safe and efficient operation. Such leaks often stem from thermal cycling, vibration, improper initial expansion or welding, corrosion, or material fatigue. A thorough understanding of the root cause is essential to prevent recurrence.
### I. Safety Precautions (Mandatory Before Any Repair)
Prior to commencing any repair work, stringent safety protocols must be observed:
* **Isolation**: Completely isolate the boiler from all steam, water, and fuel supplies. Lock Out, Tag Out (LOTO) procedures must be rigorously applied.