Generella standarder inom brandskydd

This document is to provide guidance for fire safety engineering that are applicable for enclosed fires. It is intended to be used in conjunction with models for analysis of the initiation and development of fire, fire spread, smoke formation and movement, chemical species generation, transport and decay, and people movement, as well as fire detection and suppression. This document is to be used only within this context.

This document establishes procedures to evaluate the effects of life-threatening components from fire environments in terms of the probability of compromised tenability of a targeted human population at accumulated time intervals. It makes possible the estimation of the time at which people can experience compromised tenability due to smoke, heat and toxic fire effluent. The most critical hazard is that which causes compromised tenability at the earliest time. The time-dependent production of smoke and toxic fire effluent and the thermal environment of a fire are determined by the rate of fire growth, the yields of the various fire gases produced from the involved fuels, the decay characteristics of those fire gases and the ventilation pattern (see A.1). Once these are determined, the methodology presented in this International Standard can be used for the estimation of the time at which individuals can be expected to experience compromised tenability.

This document establishes procedures to evaluate the life-threatening components from fire environments in terms of the probability of a targeted human population at accumulated time intervals. It makes possible the estimation of the time at which people in enclosed spaces can experience compromised tenability (see A.2). It enables an estimation of compromised tenability for each predicted Ct of components from fire environments. That leading to attain compromised tenability at FED = 1 earliest is considered the most critical. The non-lethal threshold-based derivation of the occurrence of compromised tenability also protects from post-exposure mortality.