Code of Federal Regulations > Title 40 > Chapter I > Part 63 > Subpart PPP > Appendix - Table 3 to Subpart PPP of Part 63—Group 1 Storage Vessels at Existing and New Affected Sources

Regulations last checked for updates: Mar 28, 2026

Title 40 - Protection of Environment last revised: Dec 15, 2026

Appendix - Table 3 to Subpart PPP of Part 63—Group 1 Storage Vessels at Existing and New Affected Sources

Vessel capacity (cubic meters)	Vapor pressure ^a (kilopascals)
75 ≤ capacity <151 ^b	^b ≥13.1
38 ≤ capacity <151 ^c	^c ≥6.9
capacity ≥151	≥5.2

^a Maximum true vapor pressure of total organic HAP at storage temperature.

^b Beginning no later than the compliance dates specified in § 63.1422(h), these vessel capacity and vapor pressure criteria no longer apply.

^c Beginning no later than the compliance dates specified in § 63.1422(h), these vessel capacity and vapor pressure criteria apply.

[91 FR 13185, Mar. 18, 2026]

authority: 42 U.S.C. 7401

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