40 CFR Part 63, Table 27 — Summary of Internal Floating Deck Fitting Loss Factors (KF) and Typical Number of Fittings (NF)
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
| Deck fitting type | Deck fitting loss factor (KF) a | Typical number of fittings (NF) |
|---|---|---|
| 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 4710 | |
| 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 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.