Summary of Control Requirements for Storage Vessels at New and Existing Sources

If the storage vessel capacity (gallons) is . . . And the vapor pressure a (psia) is . . . Then, you must use the following type of storage vessel . . . ≥20,000 but <40,000 ≥4 Internal floating roof, external floating roof, or fixed roof vented to a closed vent system and control device achieving 95 percent reduction. b ≥40,000 ≥0.75 Internal floating roof, external floating roof, or fixed roof vented to a closed vent system and control device achieving 95 percent reduction. b Any capacity. >11.1 Pressure vessel. c All other capacity and vapor pressure combinations Fixed roof. d a Maximum true vapor pressure of total HAP at storage temperature. b If using a fixed roof storage vessel vented to a closed vent system and control device, you must meet the requirements in § 63.11910(a) for fixed roof storage vessels. If using an internal floating roof storage vessel or external floating roof storage vessels, you must meet the requirements in § 63.11910(b) for internal floating roof storage vessels or external floating roof storage vessels, as applicable. c Meeting the requirements of § 63.11910(c) for pressure vessels. d Meeting the requirements in § 63.11910(a) for fixed roof storage vessels.