StacksVerified U.S. regulatory reference

40 CFR Part 63, Table 6

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov
Vessel capacity (cubic meters)Vapor pressure a (kilopascals)
38 ≤ capacity <151b≥13.1b
38 ≤ capacity <151c≥6.9c
151 ≤ capacity≥0.7

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

b For each source as defined in § 63.101, beginning no later than the compliance dates specified in § 63.100(k)(10), these vessel capacity and vapor pressure criterion no longer apply.

c For each source as defined in § 63.101, beginning no later than the compliance dates specified in § 63.100(k)(10), these vessel capacity and vapor pressure criterion apply.

[89 FR 43216, May 16, 2024]