Exam Question
Where a waste heat boiler is subject to persistent leakage at the tube / tube plate connection, suggest with sketches, methods of effecting a permanent repair. (16)
Class 4 (4th Engineer)
MEP
📅 Aug 2025
Reference Answer
### Introduction
Persistent leakage at the tube/tube plate connection in a waste heat boiler is a serious issue that compromises boiler efficiency and safety. The leaks typically arise from thermal cycling stress, vibration from the main engine exhaust, poor initial manufacturing (improper tube expansion), or corrosion/erosion. Effecting a permanent repair is critical to restore the boiler's integrity and requires skilled execution according to established procedures and classification society rules. The chosen method depends on the accessibility of the leak, the extent of the damage, and the available time and resources.
### Method 1: Tube Plugging (Semi-Permanent / Temporary Repair)
This method is employed when a permanent repair like welding or replacement is not immediately feasible due to lack of time, access, or resources. It involves taking the affected tube out of service.
Persistent leakage at the tube/tube plate connection in a waste heat boiler is a serious issue that compromises boiler efficiency and safety. The leaks typically arise from thermal cycling stress, vibration from the main engine exhaust, poor initial manufacturing (improper tube expansion), or corrosion/erosion. Effecting a permanent repair is critical to restore the boiler's integrity and requires skilled execution according to established procedures and classification society rules. The chosen method depends on the accessibility of the leak, the extent of the damage, and the available time and resources.
### Method 1: Tube Plugging (Semi-Permanent / Temporary Repair)
This method is employed when a permanent repair like welding or replacement is not immediately feasible due to lack of time, access, or resources. It involves taking the affected tube out of service.
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