1. Clarify the Tank Type & Service History
- Confirm whether it is a refurbished used tank, a tank made from recycled steel plate, or a new tank with recycled material claims.
- Should have a clear service history, previous contents, cleaning records, and refurbishment scope.
- Tanks that previously held chemicals, waste oil, or unknown liquids carry higher contamination and corrosion risks.
2. Verify Material Grade, Wall Thickness & Coating
- Carbon steel such as Q235B is common, but recycled tanks must be checked for corrosion, pitting, and thinning.
- Measure wall thickness at shell, bottom, welds, and high‑stress areas using ultrasonic testing.
- Internal and external coatings, linings, and corrosion protection must be intact.
- Reject any tank below minimum allowable thickness or with serious weld defects.
3. Require Inspection, Testing & Certification Documents
- Reliable suppliers should provide cleaning certificates, degassing reports, and leak test records.
- Obtain thickness measurement reports, weld inspection results, and coating inspection data.
- For international procurement, ask about API 653 inspection principles, UL 142 for steel tanks, or local requirements.
- Missing documentation is a major red flag.
4. Match Capacity, Fittings & Installation Conditions
- Select tank capacity, orientation, and nozzle layout according to site space and diesel consumption.
- Consider pump connection and ventilation needs.
- Ensure proper vents, flame arresters, level gauges, grounding points, and secondary containment.
- Underground or coastal installations need stronger external corrosion protection.
- Balance cost, safety, compliance, and expected service life.