Summary of Internal Floating Deck Fitting Loss Factors (K F ) and Typical Number of Fittings (N F )

Deck fitting type Deck fitting loss factor (K F ) a Typical number of fittings (N F ) Access hatch 1. Bolted cover, gasketed 1.6 Unbolted cover, gasketed 11 Unbolted cover, ungasketed b 25 Automatic gauge float well 1. Bolted cover, gasketed 5.1 Unbolted cover, gasketed 15 Unbolted cover, ungasketed b 28 Column well (see Table 24). Builtup column-sliding cover, gasketed 33 Builtup column-sliding cover, ungasketed b 47 10 Pipe column-flexible fabric sleeve seal 19 Pipe column-sliding cover, gasketed 32 Pipe column-sliding cover, ungasketed Ladder well 1. Sliding cover, gasketed 56 Sliding cover, ungasketed b 76 Roof leg or hanger well (5 + D/10 + D 2 /600) c . Adjustable b 7.9 Fixed 0 Sample pipe or well 1. Slotted pipe-sliding cover, gasketed 44 Slotted pipe-sliding cover, ungasketed 57 Sample well-slit fabric seal, 10 percent open area b 12 Stub drain, 1-in diameter d 1.2 (D 2 /125) c . Vacuum breaker 1. Weighted mechanical actuation, gasketed b 0.7 Weighted mechanical actuation, ungasketed 0.9 a Units for K F are pound-moles per year. b If no specific information is available, this value can be assumed to represent the most common/typical deck fittings currently used. c D = Tank diameter (feet). d Not used on welded contact internal floating decks.