Class 4 (4th Engineer) SSEP 📅 Sep 2025

Exam Question

(a) Illustrate with a diagram, how the engine room's hyper mist or high-pressure fog firefighting system works. Describe the sequence of events that occurs during automatic activation of a Hyper Mist system. (12)

(b) List the machinery spaces and equipment on a ship where a Hyper Mist system is typically installed. (4)

(c) Explain the manual activation procedure for the Hyper Mist system, both from the local control point and the main control panel. (4)

Reference Answer

### (a) Working Principle and Automatic Activation Sequence of a Hyper Mist System
#### Principle of Operation
The Hyper Mist (or High-Pressure Water Fog) system is a fixed firefighting installation designed for machinery spaces. Its operation is based on discharging fresh water at very high pressure through specially designed nozzles, which atomize the water into a fine mist with a droplet size typically between 50-200 micrometers.
The fire extinguishing mechanism is threefold:

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