The 750 Gallon 20 Degree Cone Bottom Tank from Norwesco (SKU N-40811) is a closed-top, full-drain vessel molded in white polyethylene, rated to a specific gravity of 1.5. It holds 750 gallons, stands 56 inches tall on a 72 by 72 inch footprint, and the 20-degree cone bottom drives sediment and slurry toward a single low point so the tank empties cleanly without a flat floor trapping product. For batching, dosing, and chemical storage where you need to drain to the last gallon, the cone geometry is the whole point.
Will it work for your application
Read the rating before you fill it. This tank carries a 1.5 specific gravity rating, meaning it is engineered to hold contents up to 1.5 times the weight of water. Full of water (SG 1.0), the contents weigh about 6,255 pounds; at the full 1.5 rating the contents can reach roughly 9,382 pounds. Match your fluid's specific gravity against that 1.5 ceiling. A cone-bottom tank empties only when it is elevated, so it needs a stand under the cone, and here is the detail buyers get wrong: size that stand to the full 9,382 pound rated load, not the 6,255 pound water weight, or you will overload the frame the first time you run a heavy fluid at 1.5 SG. Our 750 gallon 20 degree cone bottom tank with poly stand buyer's guide walks through the stand requirement. Use the Tank Sizing Calculator or Tank Sizing Guide to confirm 750 gallons fits your throughput, and lay out the closed-top ports per our tank top fitting placement guide so fill, level, vapor, and drain lines do not cross-contaminate.
Chemical compatibility
This is a polyethylene tank with a 1.5 specific gravity rating. The resin is recorded as HDLPE but flagged unconfirmed, so verify HDLPE versus crosslinked (XLPE) construction with us before committing it to chemical service. Always confirm against the OEM chemical-resistance chart, which is concentration- and temperature-specific. Within the 1.5 SG rating, this tank is compatible with the following at the listed concentrations: acetic acid at 60% (PP or PVC fittings, EPDM gaskets), aluminum sulfate at 50% (PVC, EPDM), calcium chloride at 40% (PVC, EPDM), DEF at 32.5% (316SS fittings, EPDM), ferrous sulfate at 20% (PVC, EPDM), magnesium chloride at 30% (PVC, EPDM), sodium carbonate at 30% (PVC, EPDM), urea solution at 50% (PP or PVC, EPDM), and ozonated water up to 10 PPM (PVC, EPDM). Watch the fitting and gasket call-outs, because the wrong elastomer fails before the tank does: DEF is the trap here, it needs 316 stainless fittings, not the PVC most of this list runs, while acetic acid and urea allow PP or PVC.
Chemicals that need a higher-SG tank
Several common process chemicals exceed the 1.5 rating and require a 1.9 specific gravity tank instead, not this one: 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, not Viton), 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, not PVC), and zinc orthophosphate. If your service falls here, self-qualify it against the full Chemical Compatibility Database, then talk to us about the 1.9 SG version of this tank before you order.
The mistake to avoid
The number one error on cone-bottom chemical tanks is buying on capacity alone and ignoring specific gravity. A fluid heavier than 1.5 SG will overload the wall, an under-rated stand sized to water weight will buckle under the full 9,382 pound load, and an aggressive chemical at the wrong concentration or with the wrong fitting and gasket materials will fail at the bulkhead long before the tank body does. Confirm your fluid's SG, its concentration, and the called-out fitting and gasket elastomer against the OEM chart, and verify the HDLPE versus XLPE resin question with us first.
This tank ships LTL freight, quoted live to your ZIP, from the nearest Norwesco plant to you: Hanford, CA, St. Bonifacius, MN, or Tooele, UT. Get a real number now with our Freight Cost Estimator, or call 866-418-1777 and we will quote it by phone. If you are searching cone bottom tanks or a Norwesco cone tank specifically, this 750 gallon 20 degree unit is built for full-drain bulk storage. See the technical drawing on this page for fitting locations and exact dimensions before you plumb it.
3 Year Warranty
