Safety, Fire & Survival · Fire — Fixed Water-Mist / Sprinkler
A fixed water-mist or automatic sprinkler system suppresses fire mainly by:
- ACooling and producing steam that displaces oxygen, using far less water than a hose stream✓ Correct
- BAdding fuel vapor
- CRaising the compartment oxygen level
- DElectrically charging the smoke
Explanation
Water mist breaks water into fine droplets with large surface area that flash to steam, rapidly cooling the fire and locally displacing oxygen, while using a fraction of the water of a conventional system (limiting flooding and stability concerns). Sprinklers operate automatically when heat opens the heads.
Authority: SOLAS II-2; FSS Code
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