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  • Worst-case Scenario for Flammable Mixtures

    For the risk management program, where the concentration of the regulated flammable substance in the mixture is one percent or more by weight of the mixture, the entire weight of the mixture must be applied toward the 10,000 pound threshold quantity for the flammable substance unless the owner or operator…

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  • Do quantities in co-located vessels have to be aggregated for worst-case release scenarios?

    Pursuant to the risk management program (RMP) regulations, a facility owner or operator must conduct an off-site consequence analysis that includes modeling of a worst-case release. If a single process is comprised of several co-located vessels, must the total quantity in all the vessels be aggregated to determine the worst-case…

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  • For toxic endpoints, are milligrams per liter (mg / L) equivalent to parts per million (ppm)?

    The endpoint concentrations for regulated toxic substances under the risk management program rule (40 CFR Part 68 Appendix A) are listed in units of milligrams per liter (mg/L). Is this equivalent to parts per million (ppm)? No, mg/L is not always equivalent to ppm. Whereas ppm is a volume-to-volume or…

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  • What does "relief system design basis" mean?

    Relief systems include, but are not limited to, relief valves, relief headers, relief drums, and rupture disks. Design basis means documenting how the loads and sizes of the relief system, as well as inlet and outlet sizes, were determined. This includes a description of overpressure scenarios considered, the scenario that…

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