40 CFR Part 63, Subpart G, Table 31 to Subpart G of Part 63 - Typical Number of Vacuum Breakers, NF6 and Roof Drains, a NF7

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There are 10 Updates appearing in the Federal Register for 40 CFR Part 63. View below or at eCFR (GPOAccess)
View PDF at GPOPt. 63, Subpt. G, Table 31
Table 31 to Subpart G of Part 63—Typical Number of Vacuum Breakers, NF6 and Roof Drains, a NF7
Tank diameter D (feet) b No. of vacuum breakers, NF6 No. of roof drains, N F7 double-deck roof c
Pontoon roof Double-deck roof
a This table should not supersede information based on actual tank data.
b If the actual diameter is between the diameters listed, the closest diameter listed should be used. If the actual diameter is midway between the diameters listed, the next larger diameter should be used.
c 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.
d For tanks more than 300 feet in diameter, actual tank data or the manufacturer's recommendations may be needed for the number of roof drains.
50 1 1 1
100 1 1 1
150 2 2 2
200 3 2 3
250 4 3 5
300 5 3 7
350 6 4 d
400 7 4 d

Title 40 published on 2015-07-01.

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.

  • 2015-12-04; vol. 80 # 233 - Friday, December 4, 2015
    1. 80 FR 75817 - NESHAP for Brick and Structural Clay Products Manufacturing; and NESHAP for Clay Ceramics Manufacturing: Correction
      GPO FDSys: XML | Text
      ENVIRONMENTAL PROTECTION AGENCY
      Final rule; correction.
      This action is effective December 28, 2015.
      40 CFR Part 63

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United States Code

Title 40 published on 2015-07-01

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

  • 2015-12-04; vol. 80 # 233 - Friday, December 4, 2015
    1. 80 FR 75817 - NESHAP for Brick and Structural Clay Products Manufacturing; and NESHAP for Clay Ceramics Manufacturing: Correction
      GPO FDSys XML | Text
      ENVIRONMENTAL PROTECTION AGENCY
      Final rule; correction.
      This action is effective December 28, 2015.
      40 CFR Part 63