40 CFR Table 27 to Subpart G of Part 63
Summary of Internal Floating Deck Fitting Loss Factors (KF) and Typical Number of Fittings (NF)
June 9, 2020
Open Table
| 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 | b25 | |
| Automatic gauge float well | 1. | |
| Bolted cover, gasketed | 5.1 | |
| Unbolted cover, gasketed | 15 | |
| Unbolted cover, ungasketed | b28 | |
| Column well | (see Table 24). | |
| Builtup column-sliding cover, gasketed | 33 | |
| Builtup column-sliding cover, ungasketed |
b47 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 | b76 | |
| Roof leg or hanger well | (5 + D/10 + D2/600)c. | |
| Adjustable | b7.9 | |
| 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 | b12 | |
| Stub drain, 1-in diameterd | 1.2 | (D2/125)c. |
| Vacuum breaker | 1. | |
| Weighted mechanical actuation, gasketed | b0.7 | |
| Weighted mechanical actuation, ungasketed | 0.9 |
aUnits for KF are pound-moles per year.
bIf no specific information is available, this value can be assumed to represent the most common/typical deck fittings currently used.
cD = Tank diameter (feet).
dNot used on welded contact internal floating decks.
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