General Industries’ Double-wall tanks are UL-142 and F-921® labeled and designed for storing flammable and combustible liquids. Manufactured as horizontal or vertical, the tank can be cylindrical or rectangular, using carbon or stainless steel. Tank capacity up to 50,000 gallons is available in single or multi-compartments, having an interstitial space between the inner and outer tanks that can be monitored for leakage. All double wall petroleum tanks can be provided with FLAMESHIELD® and with a STI 30-year warranty. All General Industries products are fabricated using our ISO 9001:2015 Quality Management System., complying with NFPA-30, Steel Tank Institute and International Fire Code requirements. Custom fabrication is available.