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NASA-LLIS-0047
Lessons Learned - Mercoid Pressure Switch; Inadvertent Water Deluge Activation
Year: 1991
Abstract: Description of Driving Event:
The primary cause of the mishap was an activation (closing) of the fire pump mercoid pressure switch which prematurely started the fire pump. This produced transient pressures that exceeded the 2:1 mechanical advantage of the deluge valves, forcing them open. The switch activation was caused by potable water system pressure fluctuations external to the local facility.
The primary cause of the mishap was an activation (closing) of the fire pump mercoid pressure switch which prematurely started the fire pump. This produced transient pressures that exceeded the 2:1 mechanical advantage of the deluge valves, forcing them open. The switch activation was caused by potable water system pressure fluctuations external to the local facility.
Subject: Facilities
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T18:19:07Z | |
| date available | 2017-09-04T18:19:07Z | |
| date copyright | 33591 | |
| date issued | 1991 | |
| identifier other | AFYCQCAAAAAAAAAA.pdf | |
| identifier uri | http://yse.yabesh.ir/std;jsery=autho162s7D8308/handle/yse/201818 | |
| description abstract | Description of Driving Event: The primary cause of the mishap was an activation (closing) of the fire pump mercoid pressure switch which prematurely started the fire pump. This produced transient pressures that exceeded the 2:1 mechanical advantage of the deluge valves, forcing them open. The switch activation was caused by potable water system pressure fluctuations external to the local facility. | |
| language | English | |
| title | NASA-LLIS-0047 | num |
| title | Lessons Learned - Mercoid Pressure Switch; Inadvertent Water Deluge Activation | en |
| type | standard | |
| page | 2 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1991 | |
| contenttype | fulltext | |
| subject keywords | Facilities | |
| subject keywords | Fire Protection | |
| subject keywords | Ground Equipment | |
| subject keywords | Ground Operations | |
| subject keywords | Hardware |