Class 4 (4th Engineer) MEKG 📅 Aug 2022

Exam Question

Sketch and describe an independent two-stage air compressor. Draw a set of typical indicator diagrams and insert the various pressures and temperatures. Indicate the effect of a leaking H.P. suction valve and excess H.P clearance volume (16)

Reference Answer

### **Two-Stage Independent Air Compressor**
#### **1. Principle and Description**
Multi-stage compression is employed to increase efficiency, reduce the final air temperature, and minimize the work required to compress air to high pressures (typically 30 bar for main engine starting). Compressing air in a single stage to 30 bar would result in excessively high temperatures, leading to material stress, lubrication oil breakdown, and potential ignition of oil vapour. By dividing the compression into two stages with intercooling, these issues are mitigated.
**Construction & Operation:**

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