Suppression concentration of clean agents exposed to a continuously energized heated metal surface
✍ Scribed by E Braun; C.A Womeldorf; W.L Grosshandler
- Book ID
- 104341907
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 284 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0379-7112
No coin nor oath required. For personal study only.
✦ Synopsis
An apparatus for the determination of autoignition temperature of hydrocarbon fuels has been used to measure the change in ignition temperature of a stoichiometric mixture of ethene/ air with and without the addition of a suppressant: N , IG-542, HFC-23, HFC-227ea, FC-218 or FC-3-1-10. When exposed to a heated metal surface of nickel, a fuel/air stream with clean agent added generally required higher temperatures to ignite than when no agent was present.
For some agents at low concentrations, it was found that ignition occurred at temperatures lower than when no agent was present. As agent concentration was increased, ignition became harder, i.e., the temperature required for ignition was higher. For each of these suppressants, with foil temperatures approaching 10003C, the agent concentration necessary to prevent ignition of the ethene/air mixture exceeded the total #ooding and met or exceeded the inerting design concentrations recommended in NFPA 2001, the Standard on Clean Agent Fire Extinguishing Systems.