Exam Question
(a) Describe uses of compressed air onboard the ship. (6)
(b) Describe maintenance schedule of various systems on main air compressor. (6)
(c) Describe Isolation procedure of main air compressor before starting any work. (4)
Class 4 (4th Engineer)
MEP
📅 Jan 2026
Reference Answer
### (a) Uses of Compressed Air Onboard Ship (6 Marks)
Compressed air is a vital utility onboard a marine vessel, utilized across various systems and categorized by its pressure and quality. The primary uses are as follows:
**1. Main/High-Pressure Air (~30 bar):**
* **Main and Auxiliary Engine Starting:** This is the most critical use. High-pressure air is admitted into the engine cylinders in a specific sequence via the starting air distributor, forcing the pistons down and rotating the crankshaft to achieve the required ignition speed. At least two independent compressors must be available to charge the main air receivers (bottles) as per SOLAS requirements.
Compressed air is a vital utility onboard a marine vessel, utilized across various systems and categorized by its pressure and quality. The primary uses are as follows:
**1. Main/High-Pressure Air (~30 bar):**
* **Main and Auxiliary Engine Starting:** This is the most critical use. High-pressure air is admitted into the engine cylinders in a specific sequence via the starting air distributor, forcing the pistons down and rotating the crankshaft to achieve the required ignition speed. At least two independent compressors must be available to charge the main air receivers (bottles) as per SOLAS requirements.
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