Table 4 Data on sprinkler system valve reliability
Description | Source | Unit | Minimum | Mean | Maximum |
|---|---|---|---|---|---|
Sector control valve mishandled | (Watanabe 1979) | per demand |  | 2.08 × 10 -3 |  |
Priming tank gate valve | (Watanabe 1979) | per demand |  | 2.47 × 10 -3 |  |
Deluge fail to open | (Moelling et al. 1980) | per demand | 8.9 × 10 -4 | 1.9 × 10 -3 | 3.6 × 10 -3 |
Check fail to open | (Moelling et al. 1980) | per demand | 3.0 × 10 -5 | 1.0 × 10 -4 | 3.0 × 10 -4 |
Closed inadvertently (ICV) | (Moelling et al. 1980) | failures per hour | 6.3 × 10 -7 | 6.3 × 10 -6 | 6.3 × 10 -5 |
Alarm | (Moinuddin et al. 2009) | per demand |  | 2.0 × 10 -3 | 2.94 × 10 -3 |
Main stop | (Moinuddin et al. 2009) | per demand |  | 2.3 × 10 -3 | 3.19 × 10 -3 |
Zone isolation | (Moinuddin et al. 2009) | per demand |  | 2.2 × 10 -2 | 3.17 × 10 -2 |
due to tenancy changes | Â | Â | Â | Â | Â |
Ordinary stop | (Moinuddin et al. 2009) | per demand |  | 6.7 × 10 -4 | 9.60 × 10 -4 |
Non-return | (Moinuddin et al. 2009) | per demand |  | 1.1 × 10 -3 | 1.76 × 10 -3 |
Pressure reducing | (Moinuddin et al. 2009) | per demand |  | 4.77 × 10 -3 | 1.04 × 10 -2 |
Wet alarm | (Nash and Young 1991) | failures/year |  | 4.0 × 10 -5 |  |
Alternative alarm | (Nash and Young 1991) | failures/year |  | 8.0 × 10 -5 |  |
Main sprinkler stop | (Nash and Young 1991) | failures/year |  | 2.0 × 10 -4 |  |
Non-return | (Nash and Young 1991) | failures/year |  | 1.0 × 10 -2 |  |
Main stop | (Finucane and Pinkney 1988) | failures/year |  | 2.3 × 10 -3 |  |
Non-return | (Finucane and Pinkney 1988) | failures/year |  | 1.0 × 10 -2 |  |
Main sprinkler stop | (Finucane and Pinkney 1988) | failures/year |  | 2.0 × 10 -3 |  |
Wet alarm | (Finucane and Pinkney 1988) | failures/year |  | 4.0 × 10 -4 |  |
Alternative alarm | (Finucane and Pinkney 1988) | failures/year |  | 8.0 × 10 -4 |  |
Post indicating | (Budnick 2001) | failures/hour | Â | 0 | Â |
Alarm check | (Budnick 2001) | failures/hour | Â | 0 | Â |
Outside stem and yoke | (Budnick 2001) | failures/hour | 7.5 × 10 -8 | 3.6 × 10 -7 | 8.7 × 10 -7 |
Main drain | (Budnick 2001) | failures/hour | Â | 0 | Â |
Inspector’s test | (Budnick 2001) | failures/hour | 2.3 × 10 -6 | 8.3 × 10 -6 | 1.8 × 10 -5 |
Alarm | (Ronty and Keski-Rahkonen 2004) | failures/year | 6.5 × 10 -4 | 1.2 × 10 -3 | 2.0 × 10 -3 |
Deluge (Critical) | (SINTEF 2009) | failures/ | 2.8 | 5.8 | 9.4 |
| Â | Â | 106 calendar hours | Â | Â | Â |
Deluge (All Modes) | (SINTEF 2009) | failures/ | 12 | 21 | 31 |
| Â | Â | 106 calendar hours | Â | Â | Â |