Code of Federal Regulations > Title 40 > Chapter I > Part 63 > Subpart HHHHHHH > Appendix - Table 3 to Subpart HHHHHHH of Part 63—Summary of Control Requirements for Storage Vessels at New and Existing Sources

Regulations last checked for updates: Nov 22, 2024

Title 40 - Protection of Environment last revised: Nov 20, 2024

Appendix - 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.

authority: 42 U.S.C. 7401

source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.