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Regulations last checked for updates: Apr 03, 2025
Title 40 - Protection of Environment last revised: Nov 03, 2025
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Title 40
Chapter I
Part 63
Subpart G
Appendix - Table 24 to Subpart G of Part 63—Typical Number of Columns as a Function of Tank Diameter for Internal Floating Roof Tanks With Column Supported Fixed Roofs a
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Appendix - Table 24 to Subpart G of Part 63—Typical Number of Columns as a Function of Tank Diameter for Internal Floating Roof Tanks With Column Supported Fixed Roofs a
Tank diameter range (D in feet)
Typical number of columns, (N
C
)
0 <D ≤85
1
85 <D ≤100
6
100 <D ≤120
7
120 <D ≤135
8
135 <D ≤150
9
150 <D ≤170
16
170 <D ≤190
19
190 <D ≤220
22
220 <D ≤235
31
235 <D ≤270
37
270 <D ≤275
43
275 <D ≤290
49
290 <D ≤330
61
330 <D ≤360
71
360 <D ≤400
81
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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