40 CFR Part 63, Subpart G, Table 30 to Subpart G of Part 63 - Roof Fitting Loss Factors, KFa, KFb, and m, a and Typical Number of Fittings, NT

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View PDF at GPO Pt. 63, Subpt. G, Table 30
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)
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 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.
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
Fixed 0 0 0
Roof leg (21/2-in-diameter) 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
Fixed 0 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

Title 40 published on 2013-07-01

The following are only the Rules published in the Federal Register after the published date of Title 40.

For a complete list of all Rules, Proposed Rules, and Notices view the Rulemaking tab.

  • 2014-02-27; vol. 79 # 39 - Thursday, February 27, 2014
    1. 79 FR 11228 - Revisions to Test Methods and Testing Regulations
      GPO FDSys XML | Text
      ENVIRONMENTAL PROTECTION AGENCY
      Final rule.
      This final rule is effective on February 27, 2014. The incorporation by reference materials listed in the rule are approved by the Director of the Federal Register as of February 27, 2014.
      40 CFR Parts 51, 60, 61, and 63

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United States Code

Title 40 published on 2013-07-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 40 CFR 63 after this date.

  • 2014-02-27; vol. 79 # 39 - Thursday, February 27, 2014
    1. 79 FR 11228 - Revisions to Test Methods and Testing Regulations
      GPO FDSys XML | Text
      ENVIRONMENTAL PROTECTION AGENCY
      Final rule.
      This final rule is effective on February 27, 2014. The incorporation by reference materials listed in the rule are approved by the Director of the Federal Register as of February 27, 2014.
      40 CFR Parts 51, 60, 61, and 63