Self-Bunded Fuel Tank Cleaning Procedure

1Preparation & Safety

Thoroughly cleaning a self-bunded fuel tank requires a systematic approach to address both the inner storage compartment and the outer bund, ensuring removal of contaminants, debris, and residue without damaging critical components.

Never proceed with cleaning if gas detector shows explosive vapor levels exceeding safety thresholds

Pre-Cleaning Checklist:

Empty the tank completely, flushing remaining fuel into temporary storage
Disconnect all valves, pumps, and electrical connections
Ventilate the tank by opening hatches and using fans
Test for explosive vapors with a gas detector
Wear proper PPE: chemical-resistant gloves, goggles, and respirator

Required Cleaning Equipment

High-pressure washer with fuel-tank cleaning nozzle
Biodegradable solvent compatible with tank material
Non-abrasive brushes for delicate surfaces
Wet/dry vacuum for debris removal
Mild detergent solution for bund cleaning
Compressed air system for drying
Fuel-system disinfectant for sanitation
Gas detector for safety monitoring
Personal protective equipment (full set)

2Inner Tank Cleaning

Use a high-pressure washer with a specialized fuel-tank cleaning nozzle to dislodge sludge, rust, and sediment. For stubborn deposits, circulate a biodegradable solvent (compatible with the tank's material) through the tank for 2–4 hours, then drain and rinse thoroughly with clean water.

Scrub hard-to-reach areas (e.g., corners or weld seams) with a non-abrasive brush to avoid scratching the inner lining, which could lead to corrosion.

3Outer Bund Cleaning

Remove any accumulated water, dirt, or debris using a wet/dry vacuum. Inspect for signs of fuel residue (indicating a leak) and use a mild detergent solution to scrub the bund's interior, rinsing with water to remove soap.

Ensure drainage points (if equipped) are clear to prevent standing water, which can cause rust in steel bunds or microbial growth in polymer systems.

4Post-Cleaning Procedures

After cleaning, dry all components completely—use compressed air to blow out moisture from crevices, especially in valves and fittings. Reconnect disconnected parts and conduct a pressure test to check for leaks.

Finally, sanitize the inner tank with a fuel-system disinfectant (if storing gasoline or diesel) to prevent bacterial growth, which can clog filters.

Regular thorough cleaning—recommended annually, or more frequently for tanks storing biodiesel or in dusty environments—preserves structural integrity, ensures accurate sensor readings, and extends the tank's lifespan while maintaining compliance with environmental regulations.