Table 28 - Deck Seam Length Factorsa (SD) for Internal Floating Roof Tanks

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Deck constructionTypical deck seam length factorContinuous sheet construction b:5-feet wide sheets0.2c6-feet wide sheets0.177-feet wide sheets0.14Panel construction d:5 × 7.5 feet rectangular0.335 × 12 feet rectangular0.28a 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).

                    
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