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Watermist fire fighting MV electrical safety

David Gorshkov

I am reviewing the fixed watermist fire fighting installations in a new fleet of hybrid ships we are building . The water mist based fixed fire fighting appliances (FFFA) we are using extends into the main propulsion areas as well as the power generating areas.

Water Mist heads are used instead of sprinklers these days as these are more effective, however I can find no definitive tests or regulations that state water mist is safe to use in Medium Voltage switchboard areas?  Appreciate that if I have a fire the main objective is to extinguish it but it is not unusual for FFFA to be set off accidentally in a technical space so I must then consider IP ratings of equipments in these spaces in order that equipment is not damaged during an accidental discharge and that engineers investigating the incident are not at risk of electrocution from the MV systems which may still be live or charged!

Does anyone have any reference information regarding any testing done on Watermist systems to validate their safety levels with LV, MV and indeed HV systems?

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    Based on my experience over the years on ships, water mist fixed fire fighting system have been designed to rarely activate accidentally based on two fire detectors simultaneously activating. That is, both smoke and flame detectors of the same zone/area must be active before the FFFA will release water mist to that particular area/zone. Furthermore, warning alarm precede the release of water mist to make time for evacuation. 

    The water mist system does cover/protect the auxiliary boiler area , the main engine, auxiliary engines area, incinerator area and purifier area. 

    Nonetheless, the IP rating of equipments in these areas must be of concern. 

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  • 0

    Based on my experience over the years on ships, water mist fixed fire fighting system have been designed to rarely activate accidentally based on two fire detectors simultaneously activating. That is, both smoke and flame detectors of the same zone/area must be active before the FFFA will release water mist to that particular area/zone. Furthermore, warning alarm precede the release of water mist to make time for evacuation. 

    The water mist system does cover/protect the auxiliary boiler area , the main engine, auxiliary engines area, incinerator area and purifier area. 

    Nonetheless, the IP rating of equipments in these areas must be of concern. 

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