Indian Boiler Course presents this topic in a plant-oriented, examination-ready format. The lesson combines principles, construction, operation, safety, inspection points, troubleshooting and revision questions.
Function
Raises saturated steam temperature above saturation at the same pressure. Covers radiant/convective types, attemperation, tube metal temperature and protection during start-up.
Construction and Working
Identify the body, flow path, moving parts, sealing surfaces, actuation method, instrumentation and isolation provisions. Relate each component to the failure it prevents.
Operating Checks
- Correct line-up and accessibility
- No leakage, blockage, abnormal vibration or overheating
- Valid calibration or functional test where applicable
- Clear identification and documented maintenance history
Common Faults
Typical faults arise from deposits, corrosion, erosion, misalignment, wrong adjustment, instrument failure, sticking, leakage or unsuitable operating conditions.
Exam Questions
- State the purpose and explain working.
- Draw a labelled sketch.
- List failure modes and safety consequences.
- Describe testing and inspection.