Regulations last checked for updates: Jan 30, 2025

Title 40 - Protection of Environment last revised: Nov 08, 2025
All TitlesTitle 40Chapter IPart 63Subpart GAppendix - Table 25 to Subpart G of Part 63—Effective Column Diameter (Fc)
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Appendix - Table 25 to Subpart G of Part 63—Effective Column Diameter (Fc)
Column type Fc (feet)
9-inch by 7-inch built-up columns1.1
8-inch-diameter pipe columns0.7
No construction details known1.0
authority: 42 U.S.C. 7401
source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.
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