Fire extinguishers – Special applications
Patent
1996-06-20
1997-07-22
Hoge, Gary C.
Fire extinguishers
Special applications
169 16, 169 37, A62C 3568
Patent
active
056495986
ABSTRACT:
A shroud for use with a sprinkler assembly in a corrosive environment comprising a secondary bag surrounding the sprinkler head to protect it from the corrosive environment for a minimum period of time, a ribbon-shaped corrosion sensor located adjacent to the outer surface of the secondary bag that corrodes apart to electrically trigger an alarm before the ability of the secondary bag to protect the sprinkler head fails, a primary bag surrounding the secondary bag and the sensor to protect them from the corrosive environment for a minimum period of time, a pair of gaskets with an opening for the sprinkler head, the bags extending through the opening of one of the gaskets and annular skirts extending from the edge of the bag openings being sandwiched between the gaskets and held together by a pressure-sensitive adhesive, the bags melting at a temperature that is higher than the normal temperature of the corrosive environment and lower than the temperature at which the sprinkler head activates.
REFERENCES:
patent: 676221 (1901-08-01), Davis
patent: 2890758 (1959-06-01), Pfalzgraff et al.
patent: 3388747 (1968-06-01), Hodnett
patent: 3727695 (1973-04-01), Danton
patent: 4706759 (1987-11-01), Grasseschi
patent: 4964470 (1990-10-01), Gaulin
patent: 4964471 (1990-10-01), Michalik et al.
Hoge Gary C.
PNM, Inc.
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