CFR › Title 46 › Part 154 › §154.175046 CFR §154.1750Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy linkA refrigeration system for butadiene or vinyl chloride must not use vapor compression unless it:(a)Avoids any stagnation points where uninhibited liquid can accumulate; or(b)Has inhibited liquid from the cargo tank added to the vapor upstream of the condenser.