Determining thresholds for different chemicals in interconnected vessels (EPA RMP FAQ)

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According to the definition of “process” in 40 CFR ยง68.3, any group of vessels that are interconnected is considered to be a single process.

If a stationary source has two interconnected vessels and one contains 6,000 pounds of BUTANE while the other contains 6,000 pounds of PROPANE, is this a covered process under 40 CFR Part 68?

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