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Topic Title: Fire detection and suppression system for emergency generator room
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Created On: 18 October 2012 10:00 PM
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 18 October 2012 10:00 PM
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Posts: 62
Joined: 19 October 2002

Could you please advice the appropriate fire detection and suppression system for emergency generator room?
The generator room located in the basement is having 5x 1,700kVA emergency generators and engine room mounted emergency switchboard and control system arranged to start and load as per the power demand.
The room is provided with 10 supply fans, each rated for 40,000 CFM and protected with heat detectors rated for 57deg.C and automatic suppression system using form water sprinkler, reported to be approved by the local authorities.
As the generators are operated on 75% load before insulating the exhaust silencers, the detectors operated the suppression system arranged for total flooding. This spraying water above the running generators caused the generator to trip and inoperative as the winding/ panels became wet.
My questions are:
a) Is form sprinkler system suitable for generator room, especially total flooding on multiple emergency generator room?
b) Is 57Deg.C heat detector suitable, noting that summer ambient in this area cross above 50deg.C? In case the supply fans are stopped during the generators running on load or generators stopped without cooling down, the temperature will shoot above 57deg.C and activate the suppression system
c) What is the best suppression system and detections system as per IEC or BS?
Appreciate your feedback

 19 October 2012 07:59 PM
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Posts: 213
Joined: 10 February 2012

The 57 deg C Heat detector is not suitable, a higher temp detector should have been used.

Nothing wrong with a sprinkler system in a generator room, but normal practice is to use a spray mist system.

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