Class 4 (4th Engineer) MEKG 📅 Jun 2023

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 excessive H.P. clearance volume. (16)

Reference Answer

### **Independent Two-Stage Air Compressor**
#### **1. Concept and Principle**
An independent two-stage reciprocating air compressor is a standard machinery component on board vessels, primarily used to supply high-pressure air (typically 30 bar) for starting main and auxiliary engines. The principle of multi-stage compression is employed to enhance efficiency, reduce thermal stresses, and improve safety.
**Advantages of Two-Stage Compression:**

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