Risk Analysis and Management Problems: Fire Protection
According to the NFPA 59A standard: "Provisions shall be made as follows to minimize the possibility of damaging effects of fire reaching beyond a property line that can be built upon and that would result in a distinct hazard."
(a) 5 kw/m2 at the nearest point located outside the owner's property line that, at the time of citing, is used for outdoor assembly by groups of 50 or more persons, for a fire over an impounding area containing volume V of LNG (liquid natural gas).
(b) 30 kw/m2 at a property line that can be built upon for a fire over an impounding area containing a volume V of LNG."
According to Lee's "Chemical Process Safety" ( see Handout #8) ) human and structural fragility to radiation exposure is given by
Determine the amount of damage considered acceptable by NFPA 59A and discuss.
Solution Preview
a) Figure 1 shows how the lethality level depends on the exposure time t, using the probit equation.
The exposure time is ~ 2 min, to cause 1.5 % lethality, at radiation intensity of 5 kw/m2.
After 2 min, the lethality level increases sharply with t.
We can expect that an individual exposed to radiation would run away, ...
Solution Summary
Issues realting to the NFPA 59A standard: "Provisions shall be made as follows to minimize the possibility of damaging effects of fire reaching beyond a property line that can be built upon and that would result in a distinct hazard." are discussed in detail.
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