Table 3 to Subpart HHHHHHH of Part 63 - Summary of Control Requirements for Storage Vessels at New and Existing Sources

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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.

                    
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