The Chem-Tainer 385 Gallon Double Wall Waste Oil Tank (SKU TC6440DC) is built for jobs where a single-wall tank is not enough: the tank-within-a-tank design provides integral secondary containment, so a primary leak is caught by the outer wall instead of reaching your floor or the ground. It holds 385 gallons, stands 40 inches tall on a 64 x 64 inch square footprint, and is molded from polyethylene in yellow with a 1.9 specific gravity rating. An oil level gauge is included so operators can read inventory at a glance. For anyone shopping double wall tank, waste oil tank, or vertical tank options, this is a self-contained answer that skips the separate spill pallet or berm.
Will it work for your job
The square 64 x 64 inch footprint and 40 inch height make this a low, stable tank that fits under a shed roof or against a wall in a shop bay. Used motor oil runs roughly 0.9 specific gravity, so at 385 gallons your real working load is only about 2,900 pounds. The slab still has to be rated to the full picture, though: filled with water for testing the tank carries about 3,211 pounds, and at its 1.9 specific gravity rating the maximum rated contents weight is about 6,101 pounds. Build the pad or stand to that 6,101 pound number if there is any chance you switch to a denser listed fluid later. Check the technical drawing on this page for the gauge position, and because outlet and bulkhead-fitting details are not published for this model, confirm outlet size and fitting thread before ordering valves or accessories - call 866-418-1777 and we will check. Use our Tank Sizing Calculator and Tank Sizing Guide if you are matching tank volume to a collection schedule.
Chemical compatibility
This tank is molded polyethylene with a 1.9 specific gravity rating - the highest density rating Chem-Tainer offers, so for the strong fluids below no heavier-wall tank upgrade is needed; the gating factor is fitting and gasket choice, not the tank wall. The resin is listed as HDLPE, but that mark is unverified, so confirm HDLPE versus XLPE before chemical service - the two cross-link differently and that changes long-term resistance. For the strongest acids and oxidizers listed (sulfuric 98%, hydrogen peroxide 50%, sodium hypochlorite, peracetic acid) the resin grade materially changes durability, so require written OEM resin confirmation before you buy for those duties. Compatibility below is from the OEM chemical-resistance chart and is concentration- and temperature-specific; verify your exact conditions before ordering, and match every fitting and gasket to your fluid - the wrong elastomer at a fitting is the most common failure point on a chemical tank.
Within the 1.9 SG rating, the OEM chart supports service with these fluids at the noted concentrations and recommended fitting/gasket materials: Acetic Acid (60%, PP/PVC fittings, EPDM gaskets), Aluminum Sulfate (50%, PVC, EPDM), Calcium Chloride (40%, PVC, EPDM), DEF (32.5%, 316SS fittings, EPDM), Ethylene Glycol (100%, PVC, EPDM), Ferric Chloride (50%, PVC, EPDM), Ferric Sulfate (60%, PVC, EPDM), Ferrous Sulfate (20%, PVC, EPDM), Hydrochloric Acid (37%, PVC, Viton), Hydrofluoric Acid (48%, PP/PVC, Viton), Hydrofluosilicic Acid (26%, PP/PVC, Viton), Hydrogen Peroxide (50%, PVC, Viton), Magnesium Chloride (30%, PVC, EPDM), Peracetic Acid (30%, 316SS, Aflas), Phosphoric Acid (85%, PVC, Viton), Polyaluminum Chloride (PVC, EPDM), Potassium Carbonate (50%, PVC, EPDM), Potassium Hydroxide (saturated, PVC, EPDM), Propylene Glycol (PP/316SS, EPDM), Sodium Bisulfate (PVC/PP, EPDM), Sodium Bisulfite (PVC/PP, EPDM), Sodium Carbonate (30%, PVC, EPDM), Sodium Hypochlorite (under 16.5%, PVC, Viton), Sodium Thiosulfate (40%, PVC, EPDM), Sulfuric Acid (98%, CPVC, Viton), Urea Solution (50%, PP/PVC, EPDM), Zinc Orthophosphate (PP/316SS, EPDM), and Ozonated Water (up to 10 PPM, PVC, EPDM). One operational note for a yellow waste-oil tank: DEF is contamination-sensitive and any prior oil residue ruins it, so dedicate this tank to one fluid - never run DEF and waste oil in the same vessel. See the full chemical compatibility reference and match every fitting and gasket to your fluid before you order.
Containment and compliance
Because the double wall design supplies built-in secondary containment, this tank fits the layered-safeguard approach that regulators expect for oil and hazardous-waste storage. If your site falls under federal or state rules, review our walkthroughs on RCRA 40 CFR 264.193 secondary containment, Florida DEP Chapter 62-762 aboveground storage tank compliance, SPCC 40 CFR 112 compliance, and high-level alarm and spillover redundancy engineering. The single most common mistake on a tank like this is treating the integral containment as a substitute for the rest of the program - you still need leak detection in the interstitial space and a documented inspection cadence.
This tank ships LTL from Marked Tree, Arkansas, with freight quoted live to your ZIP. Get a number in seconds with our Freight Cost Estimator, or call 866-418-1777 and we will help you size the tank, confirm fittings and gaskets for your fluid, and lock in delivery.
