40 CFR Table 32 to Subpart G of Part 63
Typical Number of Roof Legs, NF8
June 9, 2020
Open Table
| Tank diameter D (feet)b | Pontoon roof | No. of legs on double-deck roof | |
|---|---|---|---|
| No. of pontoon legs | No. of center legs | ||
| 30 | 4 | 2 | 6 |
| 40 | 4 | 4 | 7 |
| 50 | 6 | 6 | 8 |
| 60 | 9 | 7 | 10 |
| 70 | 13 | 9 | 13 |
| 80 | 15 | 10 | 16 |
| 90 | 16 | 12 | 20 |
| 100 | 17 | 16 | 25 |
| 110 | 18 | 20 | 29 |
| 120 | 19 | 24 | 34 |
| 130 | 20 | 28 | 40 |
| 140 | 21 | 33 | 46 |
| 150 | 23 | 38 | 52 |
| 160 | 26 | 42 | 58 |
| 170 | 27 | 49 | 66 |
| 180 | 28 | 56 | 74 |
| 190 | 29 | 62 | 82 |
| 200 | 30 | 69 | 90 |
| 210 | 31 | 77 | 98 |
| 220 | 32 | 83 | 107 |
| 230 | 33 | 92 | 115 |
| 240 | 34 | 101 | 127 |
| 250 | 34 | 109 | 138 |
| 260 | 36 | 118 | 149 |
| 270 | 36 | 128 | 162 |
| 280 | 37 | 138 | 173 |
| 290 | 38 | 148 | 186 |
| 300 | 38 | 156 | 200 |
| 310 | 39 | 168 | 213 |
| 320 | 39 | 179 | 226 |
| 330 | 40 | 190 | 240 |
| 340 | 41 | 202 | 255 |
| 350 | 42 | 213 | 270 |
| 360 | 44 | 226 | 285 |
| 370 | 45 | 238 | 300 |
| 380 | 46 | 252 | 315 |
| 390 | 47 | 266 | 330 |
| 400 | 48 | 281 | 345 |
aThis table should not supersede information based on actual tank data.
bIf 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.
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