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Will It Support a Self-Propagating Fire? (Abstract/Presentation)


pdf icon Will It Support a Self-Propagating Fire? (Abstract/Presentation) (273 K)
DeRis, J. L.

NIST SP 998; May 2003.

Keywords:

fire growth; fire spread; fire resistant materials; equations; heat release rate

Abstract:

Regulators need to know whether (or not) a fire resistive material will ignite rather than how long it takes to ignite when subjected to a given heat flux. The former (i.e. go/no go) question can be addressed as a steady state process, and thus is easier to answer both experimentally and theoretically. In a similar manner regulators need to know whether (or not) a fire resistive material can support a self-propagating fire rather than how fast the fire might propagate when subjected to a given exposure fire. Once again the former (i.e. go/no go) question is easier to answer both experimentally and theoretically because it can be addressed as a steady state process. Here we develop a mathematical model for whether or not a fire resistive material can support a self-propagating fire in the parallel panel geometry shown in Figure 3. It is a simple geometry. It subjects the test material to its own flame heat flux. It is a large enough to be realistic, yet uses a minimum of test material. The test is regarded as conservative by FM Global engineers.