Code of Federal Regulations > Title 40 > Chapter I > Part 63 > Subpart G > Appendix - Table 27 to Subpart G of Part 63—Summary of Internal Floating Deck Fitting Loss Factors (KF) and Typical Number of Fittings (NF)

Regulations last checked for updates: May 18, 2024

Title 40 - Protection of Environment last revised: May 16, 2024

Appendix - 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 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.

authority: 42 U.S.C. 7401

source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.