40 CFR Appendix Table 30 to Subpart G of Part 63, Roof Fitting Loss Factors, KFa, KFb, and m, a and Typical Number of Fittings, NT
|Fitting type and construction details||Loss factors b||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 32 f).|
|90 percent closed||0.51||0.81||1.0|
|Roof leg (3-in-diameter)||NF8 (Table 32 f).|
|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|
|Roof leg (2
||NF8 (Table 32 f).|
|Adjustable, pontoon area||1.7||0||0|
|Adjustable, center area||0.41||0||0|
|Adjustable, double-deck roofs||0.41||0||0|
|Rim vent (6-in-diameter)||1 g.|
|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, KFa, KFb, 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 2 1/2-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.