Class 2 (2nd Engineer) MEKG 📅 Aug 2025

Exam Question

With reference to Flue gas inert gas system:

(a) Sketch a line diagram showing a typical 'Inert Gas System' used for inerting the cargo tanks of oil tankers; Describe the system after labeling the important component parts.

(b) State what oxygen content you would expect in the flue gases if good combustion is achieved.

Reference Answer

### (a) Inert Gas System: Diagram and Description
An Inert Gas (IG) system on an oil tanker is a critical safety system designed to prevent explosions in cargo tanks. It reduces the oxygen content in the tank's atmosphere to a level where combustion cannot be supported (below 8% by volume), a state known as being 'inert'. The system utilizes cooled and cleaned flue gas from the ship's main or auxiliary boilers.
**(i) Labeled Components of a Typical Flue Gas IG System:**
1. **Boiler Uptake Valve:** A high-temperature valve, typically a butterfly valve, located at the boiler exhaust uptake to draw the flue gas. It isolates the IG plant from the boiler when not in use.

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