[9] investigated an actual office fire with a partially impaired automatic sprinkler
system. The first three sprinklers were actuated without water supply, while the last sprinkler was supplied with water at therequired operating pressure for a period of 30 min. Theresultsshowed that the single remaining sprinkler effectively controlled the fire spread for 30 min. The partially impaired sprinkler system does not completely extinguish the fire, but extends the available time for evacuation