Code of Federal Regulations > Title 40 > Chapter I > Part 63 > Subpart G > Appendix - Table 28 to Subpart G of Part 63—Deck Seam Length Factors a (SD) for Internal Floating Roof Tanks

Regulations last checked for updates: May 18, 2024

Title 40 - Protection of Environment last revised: May 16, 2024

Appendix - Table 28 to Subpart G of Part 63—Deck Seam Length Factors a (SD) for Internal Floating Roof Tanks

Deck construction	Typical deck seam length factor
Continuous sheet construction ^b:
5-feet wide sheets	0.2 ^c
6-feet wide sheets	0.17
7-feet wide sheets	0.14
Panel construction ^d:
5 × 7.5 feet rectangular	0.33
5 × 12 feet rectangular	0.28

^a Deck seam loss applies to bolted decks only. Units for S ^D are feet per square feet.

^b SD = 1/W, where W = sheet width (feet).

^c If no specific information is available, these factors can be assumed to represent the most common bolted decks currently in use.

^d SD = (L + W)/LW, where W = panel width (feet), and L = panel length (feet).

authority: 42 U.S.C. 7401

source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.