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Gasoline Transfer Tank Fire Safety Spacing Guide
Selecting the correct fire safety spacing for gasoline transfer tanks is critical to prevent ignition risks and comply with OSHA, NFPA 30, and local fire codes. Here’s a step-by-step guide:
1. Regulatory Standards
- NFPA 30 (Flammable Liquids Code):
- Aboveground Tanks: Minimum 5 ft (1.5 m) from property lines or buildings.
- Tank-to-Tank Spacing: At least 3 ft (0.9 m) between tanks to limit fire spread.
- OSHA 1910.106: Requires spacing based on tank capacity and firewall protection.
- Local Jurisdictions: Some areas mandate stricter rules (e.g., California’s 10 ft rule near ignition sources).
| Standard | Key Requirement |
|---|---|
| NFPA 30 | 5 ft from buildings, 3 ft between tanks |
| OSHA 1910.106 | Capacity-based spacing with firewall allowances |
| Local Codes | May require >10 ft from ignition sources |
2. Key Spacing Factors
- Tank Size: Larger tanks (>1,000 gal) may need greater distances (e.g., 10–25 ft).
- Ventilation: Outdoor tanks require 3 ft clearance from walls for airflow.
- Ignition Sources: Maintain 10–25 ft from electrical panels, engines, or welding areas.
- Firewalls: Non-combustible barriers (2-hour fire rating) can reduce spacing by 50%.
3. Special Scenarios
- Indoor Storage: Use UL 142-approved safety cabinets with 1-hour fire resistance.
- Dike Requirements: Secondary containment (per EPA SPCC rules) may alter spacing.
4. Compliance Checklist
- Consult NFPA 30 Table 22.4.1 for exact spacing based on tank type.
- Verify local amendments (e.g., city fire marshal rules).
- Document spacing plans for inspections.
Example Calculation
A 500-gallon transfer tank near a workshop:
- 5 ft from buildings (NFPA 30).
- 10 ft from electrical equipment (OSHA).
- 3 ft from other fuel containers.