Exam Question
Describe with suitable sketches the starting air system of slow speed two stroke engine and all the components in the system. (16)
Class 4 (4th Engineer)
MEKM
📅 Nov 2022
Reference Answer
### **Principle of Operation**
The starting air system for a slow-speed, two-stroke marine diesel engine is designed to provide the initial rotational force required to turn the crankshaft and bring the engine to its 'firing speed' (typically 20-25 RPM). At this speed, fuel injection is effective, and the heat of compression is sufficient to ignite the fuel, allowing the engine to run under its own power. The system utilizes high-pressure compressed air, typically stored at 30 bar, which is admitted directly into the cylinders in a timed sequence corresponding to the engine's firing order.
### **System Components and Functions**
1. **Air Compressors:**
The starting air system for a slow-speed, two-stroke marine diesel engine is designed to provide the initial rotational force required to turn the crankshaft and bring the engine to its 'firing speed' (typically 20-25 RPM). At this speed, fuel injection is effective, and the heat of compression is sufficient to ignite the fuel, allowing the engine to run under its own power. The system utilizes high-pressure compressed air, typically stored at 30 bar, which is admitted directly into the cylinders in a timed sequence corresponding to the engine's firing order.
### **System Components and Functions**
1. **Air Compressors:**
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