40 CFR Table 3 to Subpart HHHHHHH of Part 63: Table 3 to Subpart HHHHHHH of Part 63—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.