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2209.5.4.3.6 Alternative Venting Systems
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Where alternative venting systems are used in lieu of the requirements of Section 2209.5.4.3.5, an analysis of radiant heat exposures and hydrogen concentrations shall be provided. The analysis of exposure to radiant heat shall assume a wind speed of 30 feet/second (9.14 m/sec) and provide a design that limits radiant heat exposure to the maximum values shown in Table 2209.5.4.3.6(1). The analysis of exposure to hydrogen concentration shall provide a design that limits the maximum hydrogen concentration to the values shown in Table 2209.5.4.3.6(2).
| EXPOSED OBJECT | MAXIMUM RADIANT HEAT | TIME DURATION (minutes) |
| Personnel | 1,500 Btu/hr • ft2 (4732 W/m2) | 3 |
| Noncombustible equipment | 8,000 Btu/hr • ft2 (25 237 W/m2) | Any |
| Lot line | 500 Btu/hr • ft2 (1577 W/m2) | Any |
| EXPOSED OBJECT | MAXIMUM HYDROGEN CONCENTRATION |
| Personnel, buildings or equipment | 50% LFL within a distance of D and H of Table 2209.5.4.3.4 |
| Lot line | 50% LFL within 1.25 times the distance of D and H of Table 2209.5.4.3.4 |
| H | = | Minimum height in feet (mm) of vent pipe above the ground or above any structure or equipment within distance (D) where personnel might be present. |
| D | = | Distance in feet (mm) to adjacent structure or equipment where personnel might be present. |
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