1. Initial Drainage & Safety Preparation
- Open drainage valves to transfer waste oil into approved collection containers.
- Ensure all connections are secure to prevent accidental spills.
- Ventilate thoroughly and test internal atmosphere for personnel safety before cleaning.
2. Steam Washing & Sludge Removal
- Steam washing softens thickened oil and grease, making deposits easier to dislodge.
- For heavy buildup, technicians using non‑sparking tools manually scrape sludge following strict safety protocols.
- Ensures tank bottom and sides are free of thick, caked‑on residues.
3. High‑Pressure Water Rinsing
- High‑pressure washing blasts away remaining oil film and particulate matter.
- Wastewater generated must be carefully collected and disposed of according to environmental regulations.
- Prevents oily residue from contaminating future batches of waste oil.
4. Final Drying & Quality Inspection
- Mechanical ventilation circulates fresh air to dry tank walls completely.
- Thorough visual inspection confirms interior is free of oil, sludge, and moisture.
- Only after passing quality check can the tank be safely returned to service.