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]