Regulations last checked for updates: Sep 23, 2025

Title 40 - Protection of Environment last revised: Nov 23, 2025
All TitlesTitle 40Chapter IPart 63Subpart GAppendix -
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Appendix -
Tank diameter range (D in feet) Typical number of columns, (NC)
0 <D ≤851
85 <D ≤1006
100 <D ≤1207
120 <D ≤1358
135 <D ≤1509
150 <D ≤17016
170 <D ≤19019
190 <D ≤22022
220 <D ≤23531
235 <D ≤27037
270 <D ≤27543
275 <D ≤29049
290 <D ≤33061
330 <D ≤36071
360 <D ≤40081

a Data in this table should not supersede information on actual tanks.

authority: 42 U.S.C. 7401
source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.
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