Deck Seam Length Factors a (S D ) 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 S D = 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 S D = (L + W)/LW, where W = panel width (feet), and L = panel length (feet).