Table 10 Reported reasons for sprinkler systems to fail to operate
Source | Years | Types of systems | Number of tires | Percent effective | System shut off | Inappropriate system | Lack of maintenance | Manual intervention | Damaged component | System frozen |
|---|---|---|---|---|---|---|---|---|---|---|
(Tryon and McKinnon 1969) | 1925-1964 | Not specified | 75290 | 96.2% | 63% | 15% | 15% | Â | 3% | 2% |
(Hall 2006) | 1999-2002 | All sprinklers | Not reported | 89.3% | 65% | 5% | 11% | 16% | 3% | Â |
(Hall 2007) | 2002-2004 | All sprinklers | Not reported | 90% | 66% | 10% | 10% | 20% | 2% | Â |
(Hall 2010) | 2003-2007 | All sprinklers | 44310 | 91% | 53% | 20% | 15% | 9% | 2% | Â |
(Hall 2012) | 2006-2010 | All sprinklers | 47520 | 88% | 63% | 5% | 6% | 18% | 8% | Â |
(US Department of Energy 2004) | 1955-2003 | Water-based | 251 | 98.8% | 33% | 33% | Â | Â | 33% | Â |
(Powers 1979) | 1969-1978 | High-rise office buildings | 254 | 98.8% | 100% | Â | Â | Â | Â | Â |
(Powers 1979) | 1969-1978 | High-rise buildings (excl. office) | 1394 | 98.4% | 100% | Â | Â | Â | Â | Â |
(Powers 1979) | 1969-1978 | Low rise buildings | 4061 | 95.8% | 85% | 12% | 3% | Â | Â | Â |
(Marryatt 1988) | 1886-1986 | All sprinklers | 9022 | 99.5% | 100% | Â | Â | Â | Â | Â |
| Â | Â | Â | Mean | 94.7% | 73% | 14% | 10% | 15% | 9% | 2% |
| Â | Â | Â | St. dev. | 4.4% | 23% | 10% | 5% | 4% | 12% | N/A |