The Norwesco 7500 Gallon 30 Degree Cone Bottom Tank (SKU N-40551) is built for full-drain chemical and process service where the contents need to evacuate completely under gravity. Molded in white polyethylene with a 1.5 specific gravity rating, this 7,500-gallon cone bottom tank measures 149 inches tall on a 141 x 141 inch footprint. The steep 30-degree cone forces solids and slurries toward the outlet instead of leaving residue pooled on a flat floor, which is why cone bottom buyers reach for this geometry for batching, mixing, dosing, and settle-out applications.
Will it hold your process?
The 1.5 SG rating governs what you can store. Full of plain water this tank carries roughly 62,550 lb; at its maximum rated contents weight it is engineered to 93,825 lb, which is what the 1.5 specific gravity allows. Match your chemical's specific gravity against that 1.5 ceiling before you commit - if your fluid is denser than 1.5 SG, this is the wrong tank, no matter how well the chemistry matches the resin. The 149 in height and 141 in diameter are the tank body alone, not the installed top-of-fill height once it sits in a stand, so check the technical drawing on this page for cone height and required stand clearance before you spec a door, ceiling, or pad. Use the Tank Sizing Calculator and the Tank Sizing Guide to confirm the cone, stand height, and fill weight work for your site and your pump.
Chemical compatibility
This cone bottom tank is rated to 1.5 specific gravity. Confirm the resin grade for your specific chemical at 866-418-1777 before you order - whether HDLPE or XLPE is correct depends on the service, and we will verify it against your chemistry. The chemicals below are compatible with a 1.5 SG polyethylene cone bottom at the listed concentrations; always confirm against the OEM chemical-resistance chart, which is concentration- and temperature-specific:
- Acetic Acid (60%) - PP/PVC fittings, EPDM gaskets
- Aluminum Sulfate (50%) - PVC fittings, EPDM gaskets
- Calcium Chloride (40%) - PVC fittings, EPDM gaskets
- DEF (32.5%) - 316SS fittings, EPDM gaskets
- Ferrous Sulfate (20%) - PVC fittings, EPDM gaskets
- Magnesium Chloride (30%) - PVC fittings, EPDM gaskets
- Sodium Carbonate (30%) - PVC fittings, EPDM gaskets
- Urea Solution (50%) - PP/PVC fittings, EPDM gaskets
- Ozonated Water (up to 10 PPM) - PVC fittings, EPDM gaskets
The fitting and gasket materials are not interchangeable, and this tank ships without a pre-spec'd fitting package - fittings and gaskets are selected per chemical and are not included by default, so specify them when you order. DEF, for example, calls for 316 stainless steel fittings with EPDM gaskets, not PVC. Several common chemicals are not safe in this 1.5 SG tank and require a higher 1.9 SG cone bottom instead: Ethylene Glycol, Ferric Chloride, Ferric Sulfate, Hydrochloric Acid, Hydrofluoric Acid, Hydrofluosilicic Acid, Hydrogen Peroxide, Peracetic Acid, Phosphoric Acid, Polyaluminum Chloride, Potassium Carbonate, Potassium Hydroxide, Propylene Glycol, Sodium Bisulfate, Sodium Bisulfite, Sodium Hypochlorite, Sodium Thiosulfate, Sulfuric Acid, and Zinc Orthophosphate. Several of those also call for Viton or Aflas gaskets rather than EPDM. If your chemical is on that 1.9 SG list, request the 1.9 SG equivalent cone bottom in the same 7,500-gallon class - call 866-418-1777 and we will source it. Full concentration and material detail lives in our Chemical Compatibility Database.
The mistake to avoid
The single most common cone bottom error is treating the cone as a self-supporting tank. A 30-degree cone bottom does not stand on its own - it is designed to sit in a matching steel or poly support stand that carries the full 93,825 lb of rated contents. Order or confirm your stand before the tank arrives, level the pad, and check the outlet and fitting materials against the chemical you are running. See the technical drawing on this page for fitting locations, outlet position, and cone dimensions, and reference the Norwesco cone bottom buyer's guide on 15 vs 30 vs 45 degree selection and the complete 7500 gallon buyer's guide to size the system correctly.
This Norwesco cone bottom tank ships LTL freight, quoted live to your ZIP from the nearest stocking plant - Shawnee, OK; St. Bonifacius, MN; or Washington Court House, OH - so lead time and cost vary by destination. At 7,500 gallons it moves as a flatbed-scale LTL load that needs equipment on site to offload and set in its stand, so plan your rigging. Get a freight quote to your ZIP in seconds with our Freight Cost Estimator, or call 866-418-1777 to confirm resin, fittings, and the right support stand for your install.
3 Year Warranty
