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Table 27 to Subpart G of Part 63—Summary of Internal Floating Deck Fitting Loss Factors (K<sub>F</sub>) and Typical Number of Fittings (N<sub>F</sub>)

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

  1. CFR
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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 27 to Subpart G of Part 63
CorpusDaily eCFR
Displayed edition2026-04-27
Last updated2026-04-27

Table 27 to Subpart G of Part 63—Summary of Internal Floating Deck Fitting Loss Factors (KF) and Typical Number of Fittings (NF)

Deck fitting typeDeck fitting loss factor (KF) aTypical number of fittings (NF)
Access hatch1.
Bolted cover, gasketed1.6
Unbolted cover, gasketed11
Unbolted cover, ungasketedb 25
Automatic gauge float well1.
Bolted cover, gasketed5.1
Unbolted cover, gasketed15
Unbolted cover, ungasketedb 28
Column well(see Table 24).
Builtup column-sliding cover, gasketed33
Builtup column-sliding cover, ungasketedb 47

10
Pipe column-flexible fabric sleeve seal19
Pipe column-sliding cover, gasketed32
Pipe column-sliding cover, ungasketed
Ladder well1.
Sliding cover, gasketed56
Sliding cover, ungasketedb 76
Roof leg or hanger well(5 + D/10 + D 2/600) c.
Adjustableb 7.9
Fixed0
Sample pipe or well1.
Slotted pipe-sliding cover, gasketed44
Slotted pipe-sliding cover, ungasketed57
Sample well-slit fabric seal, 10 percent open areab 12
Stub drain, 1-in diameter d1.2(D 2/125) c.
Vacuum breaker1.
Weighted mechanical actuation, gasketedb 0.7
Weighted mechanical actuation, ungasketed0.9
a Units for KF 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.