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63.3.7 Oxidizing Gases
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The storage or use of oxidizing compressed gases exceeding the quantity thresholds for gases requiring special provisions as specified in Table 63.2.3.1.1 shall be in accordance with Chapters 1 through 6 of NFPA 55 and 63.3.1 through 63.3.3 and 63.3.7. [55:7.7.1]
The outdoor storage or use of oxidizing compressed gas shall be in accordance with Table 63.3.7.2. [55:7.7.2]
Table 63.3.7.2 Distance to Exposures for Oxidizing Gases
| Quantity of Gas Stored (at NTP) | Distance to a Building Not Associated with the Manufacture or Distribution of Oxidizing Gases or to a Public Way or Property Line | Minimum Distance Between Storage Areas | |||||
|---|---|---|---|---|---|---|---|
| scf | Nm3 | ft | m | ft | m | ||
| 0—50,000 | 0—1416 | 5 | 1.5 | 5 | 1.5 | ||
| 50,001—100,000 | 1417—2832 | 10 | 3.0 | 10 | 3.0 | ||
| ≤100,001 | ≤2833 | 15 | 4.6 | 15 | 4.6 | ||
[55: Table 7.7.2]
The distances shall not apply where fire barriers having a minimum fire resistance of 2 hours interrupt the line of sight between the container and the exposure. [55:7.7.2.1]
Where a fire barrier is used to protect compressed gas systems, the system shall terminate downstream of the source valve. [55:7.7.2.1.1]
The fire barrier wall shall be either an independent structure or the exterior wall of the building adjacent to the storage or use area. [55:7.7.2.1.2]
The fire barrier shall be at least 5 ft (1.5 m) from the storage or use area perimeter. [55:7.7.2.2]
The configuration of the fire barrier shall allow natural ventilation to prevent the accumulation of hazardous gas concentrations. [55:7.7.2.3]
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