GroundRules
40 CFR Table 27 to Subpart G of Part 63: Table 27 to Subpart G of Part 63—Summary of Internal Floating Deck Fitting Loss Factors (KF) and Typical Number of Fittings (NF)
Where this section sits in the code
- Title 40—Protection of Environment
- CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY
- SUBCHAPTER C—AIR PROGRAMS
- PART 63—NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS FOR SOURCE CATEGORIES
- Subpart G—National Emission Standards for Hazardous Air Pollutants From the Synthetic Organic Chemical Manufacturing Industry for Process Vents, Storage Vessels, Transfer Operations, and Wastewater
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 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 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.
Collected 2026-08-27T02:26:04Z. Source file · JSON