Class 2 (2nd Engineer) MEKG 📅 Mar 2023

Exam Question

With reference to fixed installations for dealing with a machinery space fire:

(a) Describe with the aid of a sketch a typical installation. (5)

(b) Explain the testing procedure for the equipment. (5)

(i) remote shut down

(ii) other equipment to be used in the event of an engine room fire

Reference Answer

### (a) Description of a Typical Bulk CO2 Installation
A typical fixed fire-fighting installation for a machinery space, as mandated by SOLAS, is a high-pressure or low-pressure Carbon Dioxide (CO2) system. The following describes a low-pressure bulk CO2 system, commonly found on larger vessels.
**1. System Concept:**
The system is designed to totally flood the machinery space with CO2, an inert gas, which displaces oxygen, thereby extinguishing the fire. The quantity of CO2 is calculated to achieve a minimum concentration of 34% by volume in the largest machinery space protected, which reduces the ambient oxygen level to below that required for combustion (typically <15%).

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