Secondary Containment Regulations
Understanding regulatory requirements for double-wall diesel tanks is essential for compliance and environmental protection. This guide outlines key considerations for secondary containment systems.
1 Regulatory Definitions of Secondary Containment
- Secondary containment refers to systems designed to capture leaks or spills from primary storage tanks
- EPA (U.S.) and EU directives recognize the outer wall as built-in secondary containment
- Outer layer creates a physical barrier that contains leaks from the inner tank
- Specific rules vary by region - local codes must always be verified
- Aligns with core purpose of secondary containment requirements
2 Built-In Design as Compliance Tool
- Modern double-wall tanks engineered to meet secondary containment standards inherently
- Interstitial space (typically 2–6 inches) designed to hold leaked fuel
- Capacities often exceed 10% of tank's total volume (meeting EPA requirement)
- Many jurisdictions waive additional containment for properly certified double-wall tanks
- Integrated design reduces need for external containment systems
3 Exceptions in High-Risk Environments
- Stricter rules apply near drinking water sources, wetlands, or populated zones
- May require supplementary containment (concrete dikes, berms, liners)
- Extra protection mitigates risks of simultaneous wall failure
- Addresses extreme scenarios like severe corrosion or physical damage
- Regulators assess site-specific environmental risks
4 Maintenance and Compliance Obligations
- Regular inspection of interstitial space required (sensors/visual checks)
- Damaged outer wall can invalidate secondary containment status
- Failure to maintain may result in non-compliance
- Documentation of inspections often required for regulatory audits
- Proper maintenance ensures continued compliance with standards
5 Comparison with Single Wall Tank Requirements
- Single wall tanks almost universally require separate containment (vaults/liners)
- Double-wall design reduces installation costs and compliance burdens
- Never eliminates all compliance obligations - site-specific rules apply
- Demonstrates double-wall's regulatory advantage
- Always consult local authorities for specific requirements
Important Note: While double-wall tanks offer significant compliance advantages, regulations evolve and vary by jurisdiction. Always verify current requirements with local environmental agencies and consult with certified tank professionals for your specific installation.