250 Gallon Cone Bottom Tank

The Norwesco 250 Gallon Cone Bottom Tank (SKU N-41478) is a 1.5 specific-gravity polyethylene tank built for chemical service where you need to fully drain the contents - the cone bottom geometry empties the tank without a low-spot dead zone. It stands 67 inches tall on a 36-inch diameter footprint, holding 250 gallons. At a 1.5 SG rating it carries any liquid up to a maximum rated contents weight of 3,128 pounds. Plain water fills it to roughly 2,085 pounds, so the headroom above that number is what lets it handle denser chemicals safely. This is the kind of cone bottom tank operators reach for when settling solids, batch mixing, or controlled draw-down matters more than maximizing footprint.

Will it work for your application?

Match the tank's 1.5 SG rating to your liquid's specific gravity before anything else - that single number is the dividing line between a tank that lasts and one that bulges. The cone bottom needs a support stand (the tank does not free-stand on its cone), and you'll want to size the bottom outlet to your solids load. If you're storing anything that settles or thickens, our guide on cone-bottom outlet sizing for high-solids vs low-solids service walks through cone-angle and outlet geometry so the cone actually empties instead of bridging and plugging. For top connections, the tank top fitting placement strategy guide covers vent, fill, and level layout. Refer to the technical drawing on this page for fitting locations and dimensional detail, and use the Tank Sizing Calculator or Tank Sizing Guide to confirm 250 gallons is the right volume for your batch.

Chemical compatibility

This tank is polyethylene with a 1.5 specific-gravity rating. Confirm whether your construction is HDLPE or XLPE before committing it to chemical service, since resin type drives the chemical-resistance profile. Compatibility below is driven by the specific chemical, concentration, and temperature, so confirm those against the linked data before service. At the 1.5 SG rating, the following are compatible per our chemical compatibility data: Acetic Acid at 60% (PP/PVC fittings, EPDM gaskets), Aluminum Sulfate at 50% (PVC, EPDM), Calcium Chloride at 40% (PVC, EPDM), DEF at 32.5% (316SS, EPDM), Ferrous Sulfate at 20% (PVC, EPDM), Magnesium Chloride at 30% (PVC, EPDM), Sodium Carbonate at 30% (PVC, EPDM), Urea Solution at 50% (PP/PVC, EPDM), and Ozonated Water up to 10 PPM (PVC fittings, EPDM gaskets). Match your fitting and gasket materials to the chemical, not just to the tank. The full Chemical Compatibility Database has the per-chemical detail.

Chemicals that need a higher-SG tank

Several common chemicals exceed what a 1.5 SG tank should hold and require a 1.9 specific-gravity tank instead - storing them in this 250-gallon unit is the mistake to avoid. Those include Ethylene Glycol, Ferric Chloride, Ferric Sulfate, Hydrochloric Acid (Viton gaskets), Hydrofluoric Acid (Viton), Hydrofluosilicic Acid (Viton), Hydrogen Peroxide (Viton), Peracetic Acid (316SS fittings, Aflas gaskets), Phosphoric Acid (Viton), Polyaluminum Chloride, Potassium Carbonate, Potassium Hydroxide, Propylene Glycol, Sodium Bisulfate, Sodium Bisulfite, Sodium Hypochlorite (Viton), Sodium Thiosulfate, Sulfuric Acid (CPVC fittings, Viton gaskets), and Zinc Orthophosphate. If your liquid is on this list, you need a 1.9 SG cone bottom tank - call 866-418-1777 and we'll match you to the right SG rating before you order rather than running this tank at the edge of its rating.

Level monitoring and labeling

For chemical storage you'll want reliable level indication and correct hazard signage. Our guides on level gauge selection for chemical service and tank label and signage compliance cover the gauge technology and NFPA 704 / GHS placement decisions that keep the installation compliant and the operators safe.

This cone bottom tank ships LTL freight from the Norwesco plant in Burnet, TX, quoted live to your ZIP. Get a freight estimate with our Freight Cost Estimator, or call 866-418-1777 to talk through fittings, the cone support stand, and SG selection before you order.