Exam Question

### (a) Explanation for Frequent Draining of Starting Air Receivers
Starting air receivers must be drained frequently to remove accumulated moisture and oil, preventing a range of detrimental effects that compromise safety, operational integrity, and equipment longevity. The primary reasons are rooted in the physics of air compression and its interaction with atmospheric conditions:
* **Condensation Due to Compression and Cooling:**
* **Water Vapour in Atmospheric Air:** Atmospheric air, drawn into the compressor, always contains a certain amount of water vapour. The quantity depends on ambient temperature and relative humidity.