- 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 bb ≥13.1 38 ≤ capacity <151 cc ≥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]