Exam Question

### (a) Safety Features in a Main Engine Air Starting System
Three principal safety features are incorporated into a marine 2-stroke engine air starting system to protect both personnel and machinery from the high pressures and potential hazards involved.
1. **Flame Trap and/or Bursting Disc:**
* **Description:** This device is fitted in the starting air pipeline leading to each individual cylinder's starting air valve. A flame trap consists of a corrosion-resistant element (e.g., brass or stainless steel gauze/sintered metal) that can quench a flame front. A bursting disc is a calibrated, thin metal disc designed to rupture at a pre-determined pressure, which is significantly lower than the pipeline's test pressure but higher than the normal starting air pressure.