entech. WKP Magazine Explosion Simulation – Gas Dispersal Study P a g e | 15 It takes approximately 16 hours to exhaust NO2 at safe levels from the Plant Portal, with residual gases clearing after two days. Figure 4-4 – Gas concentration in ppm over time, exhausting Willows Portal. It takes a similar amount of time to exhaust NO2 at safe levels from the Willows Portal, with residual gases clearing after two days. Figure 4-5 – Gas concentration in ppm over time, exhausting Rise 1 in Winter.
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