Home › CFR › Title 46 › Part 154 › §154.44546 CFR §154.445 — Design vapor pressure.Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy linkIf the surfaces of an independent tank type B are mostly flat surfaces, the Po must not exceed 69 kPa gauge (10 psig).