NASA-LLIS-0047
Lessons Learned - Mercoid Pressure Switch; Inadvertent Water Deluge Activation
active, Most Current
| Organization: | NASA |
| Publication Date: | 19 December 1991 |
| Status: | active |
| Page Count: | 2 |
scope:
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.
Document History
NASA-LLIS-0047
December 19, 1991
Lessons Learned - Mercoid Pressure Switch; Inadvertent Water Deluge Activation
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...
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