40 C.F.R. § 63 app Table 30 to Subpart G of Part 63

Current through May 31, 2024

Appendix Table 30 to Subpart G of Part 63 - Roof Fitting Loss Factors, K[Fa], K[Fb], and m, [a] and Typical Number of Fittings, N[T]

Fitting type and construction details	Loss factorsb			Typical number of fittings, NT
	KFa (lb-mole/yr)	KFb (lb-mole/[mi/hr]m-yr)	m (dimensionless)
Access hatch (24-in-diameter well)				1.
Bolted cover, gasketed	0	0	c 0
Unbolted cover, ungasketed	2.7	7.1	1.0
Unbolted cover, gasketed	2.9	0.41	1.0
Unslotted guide-pole well (8-in-diameter unslotted pole, 21-in-diameter well)				1.
Ungasketed sliding cover	0	67	c 0.98
Gasketed sliding cover	0	3.0	1.4
Slotted guide-pole/sample well (8-in-diameter unslotted pole, 21-in-diameter well)				(d).
Ungasketed sliding cover, without float	0	310	1.2
Ungasketed sliding cover, with float	0	29	2.0
Gasketed sliding cover, without float	0	260	1.2
Gasketed sliding cover, with float	0	8.5	1.4
Gauge-float well (20-inch diameter)				1.
Unbolted cover, ungasketed	2.3	5.9	c 1.0
Unbolted cover, gasketed	2.4	0.34	1.0
Bolted cover, gasketed	0	0	0
Gauge-hatch/sample well (8-inch diameter)				1.
Weighted mechanical actuation, gasketed	0.95	0.14	c 1.0
Weighted mechanical actuation, ungasketed	0.91	2.4	1.0
Vacuum breaker (10-in-diameter well)				NF6 (Table 31).
Weighted mechanical actuation, gasketed	1.2	0.17	c 1.0
Weighted mechanical actuation, ungasketed	1.2	3.0	1.0
Roof drain (3-in-diameter)				NF7 (Table 31).
Open	0	7.0	e 1.4	NF8 (Table 32f).
90 percent closed	0.51	0.81	1.0
Roof leg (3-in-diameter)				NF8 (Table 32f).
Adjustable, pontoon area	1.5	0.20	c 1.0
Adjustable, center area	0.25	0.067	c 1.0
Adjustable, double-deck roofs	0.25	0.067	1.0
Fixed	0	0	0
Roof leg (21/2-in-diameter)				NF8 (Table 32f).
Adjustable, pontoon area	1.7	0	0
Adjustable, center area	0.41	0	0
Adjustable, double-deck roofs	0.41	0	0
Fixed	0	0	0
Rim vent (6-in-diameter)				1g.
Weighted mechanical actuation, gasketed	0.71	0.10	c 1.0
Weighted mechanical actuation, ungasketed	0.68	1.8	1.0

^a The roof fitting loss factors, K_Fa, K_Fb, and m, may only be used for wind speeds from 2 to 15 miles per hour.

^b Unit abbreviations are as follows: lb = pound; mi = miles; hr = hour; yr = year.

^c If no specific information is available, this value can be assumed to represent the most common or typical roof fittings currently in use.

^d A slotted guide-pole/sample well is an optional fitting and is not typically used.

^e Roof drains that drain excess rainwater into the product are not used on pontoon floating roofs. They are, however, used on double-deck floating roofs and are typically left open.

^f The most common roof leg diameter is 3 inches. The loss factors for 2¹/₂-inch diameter roof legs are provided for use if this smaller size roof is used on a particular floating roof.

^g Rim vents are used only with mechanical-shoe primary seals.

40 C.F.R. 63 app Table 30 to Subpart G of Part 63