What is the design principle of Ground Double Wall Diesel Fuel Storage Tank

Core Design Philosophy

The design principle of a ground double-wall diesel fuel storage tank revolves around redundancy, containment, and risk mitigation to ensure safe fuel storage while minimizing environmental and operational hazards. Its core features and design logic include:

1. Dual-Wall Containment

The tank consists of two concentric walls:

Primary Wall: Directly holds the diesel fuel, constructed from robust materials (e.g., steel, fiberglass-reinforced plastic) resistant to corrosion, fuel degradation, and mechanical stress.
Secondary Wall: Encloses the primary tank, creating an annular space (gap) between the two layers. This secondary barrier is designed to withstand the same environmental and mechanical stresses as the primary wall.

2. Leak Detection and Monitoring

The annular gap is critical for early leak detection. Designers integrate sensors or monitoring systems to:

Detect fuel accumulation in the annulus (e.g., via liquid-level sensors, pressure differential gauges, or vapor sensors).
Alert operators to breaches in the primary wall before a catastrophic failure occurs.
Some systems use negative pressure in the annulus (vacuum monitoring) to enhance leak sensitivity.

3. Material and Structural Integrity

Corrosion Resistance: Both walls are often coated with epoxy, polyethylene, or other linings to resist diesel's corrosive effects.
Structural Redundancy: The double-wall design distributes mechanical loads across both layers.
Fire and Impact Resistance: Outer walls may include fireproofing materials to comply with safety codes.

4. Environmental Compliance

The design aims to meet regulations like the U.S. EPA's SPCC rule or EU's Seveso Directive, which mandate secondary containment for hazardous liquids.

5. Operational Accessibility

Above-ground designs prioritize ease of inspection, maintenance, and fuel management with visible placement and integrated components.