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Table 28 to Subpart G of Part 63—Deck Seam Length Factors <sup>a</sup> (S<sub>D</sub>) for Internal Floating Roof Tanks

Deck Seam Length Factors <sup>a</sup> (S<sub>D</sub>) for Internal Floating Roof Tanks

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  3. Title 40
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  5. Chapter I
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  7. Part 63
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  9. Subpart G
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  11. Appendix Table 28 to Subpart G of Part 63
CorpusDaily eCFR
Displayed edition2026-04-27
Last updated2026-04-27

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

Deck constructionTypical deck seam length factor
Continuous sheet construction b:
5-feet wide sheets0.2 c
6-feet wide sheets0.17
7-feet wide sheets0.14
Panel construction d:
5 × 7.5 feet rectangular0.33
5 × 12 feet rectangular0.28
a Deck seam loss applies to bolted decks only. Units for SD 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).