ERPGs Guidelines

The results indicate that 2000 people will be exposed to a concentration of ammonia greater than the emergency response planning guideline concentration (e.g., ERPG-2). 

A system of guidelines for air concentrations of toxic materials prepared by the American Industrial Hygiene Association. An ERPG is the maximum airborne concentration below which it is believed that nearly all individuals could be exposed for up to 1 hour with the following results ... 

AIIIA Emergency Response Planning Guidelines (ERPGs) ERPG-1 ERPG-2 ERPG-3 0.1 ppm 30 ppm 100 ppm AIHA 1991... 

AIHA (American Industrial Hygiene Association). 1993. Emergency Response Planning Guideline (ERPG) for Arsine. Fairfax, VA AIHA. 

Table 5-6 Emergency Response Planning Guidelines (ERPGs)1 (all values are in ppm unless otherwise noted) ...

Craig et al.13 provided a hierarchy of alternative concentration guidelines in the event that ERPG data are not available. This hierarchy is shown in Table 5-9. 

The Dow indexes are useful for determining equipment spacing requirements. The F EI uses an empirical correlation based entirely on the F EI value to estimate the radius of exposure. It is assumed that any equipment located outside this distance would not be damaged by a fire or explosion. The CEI estimates the hazard distance for chemical exposure based on the emergency response planning guideline (ERPG) values for the particular material released. 

Emergency response, to hazardous materials incidents, 25 343 Emergency Response Planning Guidelines (ERPGs), for sulfuric acid, 23 795 values in, 13 156 Emery, dental abrasive, 8 339 Emetine, 2 74, 100 (—)-Emetine, 2 84, 85 Emission, from OLEDs, 22 215, 218-219. See also Emissions... 

Figure 6 Cloud footprint to an atmospheric concentration of 20 ppm resulting from the rupture of a 50-mm-diameter chlorine pipe containing either chlorine liquid or chlorine vapor. Release conditions Complete rupture of pipe without shutoff, pipe elevation is 5 m above grade, wind speed is 5 m/sec, atmospheric stability class D, 20 ppm is the Emergency Response Planning Guideline-3 (ERPG-3) concentration for chlorine, the concentration at which life-threatening effects might result from exposure for 1 hour.

Other means of evaluating the toxic effects of vapors, and their potential impact on exposed people, can be found in the Emergency Response Planning Guidelines for Air Contaminants (ERPGs), issued by the American Industrial Hygiene Association (1992). The documents define values of exposure to toxic vapors needed to produce specific health effects. Three levels of vapor concentration are defined ... 

For illustrative purposes, the hazardous properties of the materials used in the examples have been modeled to the Emergency Response Planning Guideline, ERPG-2 (see Section 3.1.1) concentration for toxic materials, or to one half of the lower flammable limit (LFL/2) for flammable material. Lastly, only the first 3600 seconds of the event are considered in these examples. For an actual situation, different concentration levels for toxic or flammable concentrations may be considered and different durations as well. 

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