The Snyder Industries 3900 Gallon Heavy Duty Cone Bottom Tank is built for full-drain bulk chemical service where you cannot afford settled solids or a flat-bottom dead leg. Molded in black High Density Linear Polyethylene with a 1.9 specific gravity rating, this cone bottom tank stands 180 inches tall on a 90.0 x 90.0 inch footprint and forces every gallon toward the cone outlet. The 1.9 SG rating is the number that matters most here: it is the densest standard polyethylene rating, the ceiling that lets you run heavy process chemistry a lighter-walled vessel could not carry.
Will it handle your chemical and your weight?
Filled with water this tank carries roughly 32,526 pounds; at its maximum rated contents weight it holds up to 61,799 pounds of product. Those two numbers are the same 1.9 SG spec viewed two ways - the wall is engineered for liquids up to 1.9 specific gravity, and at that density the contents alone reach about 61,800 pounds before you add tank tare. Spec the steel stand and pad off the loaded number, not the water weight, or you will under-build the support. A 3900 gallon cone bottom tank must sit in a matching stand rated for the full loaded weight, never on grade. Run your fill volume through the Tank Sizing Calculator and review the Tank Sizing Guide to confirm the cone-and-stand combination matches your duty cycle.
Chemical compatibility
This is an HDLPE tank rated to 1.9 specific gravity. The resin handles a broad slate of process chemicals, but compatibility depends on resin, concentration, temperature, and the fitting and gasket materials you pair with it. Two confirmed chemicals break the PVC/PP pattern and require stainless: DEF (32.5%, 316SS fittings, EPDM gaskets) and Peracetic Acid (30%, 316SS, and the only Aflas gasket on the list). The rest of the verified slate from the manufacturer chemical-resistance chart: Acetic Acid (60%, PP/PVC, EPDM), Aluminum Sulfate (50%, PVC, EPDM), Calcium Chloride (40%, PVC, 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), Phosphoric Acid (85%, PVC, Viton), Potassium Carbonate (50%, PVC, EPDM), Potassium Hydroxide (saturated, PVC, EPDM), Sodium Carbonate (30%, PVC, EPDM), Sodium Hypochlorite (PVC, Viton), Sodium Thiosulfate (40%, PVC, EPDM), Sulfuric Acid (98%, CPVC, Viton), and Urea Solution (50%, PP/PVC, EPDM).
Two entries carry a hard ceiling, not just a tested point: Sodium Hypochlorite is rated only up to 16.5% (requalify above that), and Ozonated Water only up to 10 PPM (PVC, EPDM). Several chemicals are listed without a pinned concentration on the chart - Polyaluminum Chloride (PVC, EPDM), Propylene Glycol (PP/316SS, EPDM), Sodium Bisulfate (PVC/PP, EPDM), Sodium Bisulfite (PVC/PP, EPDM), and Zinc Orthophosphate (PP/316SS, EPDM) - so treat those as resin-compatible but confirm your specific concentration before you order. Hydrofluoric Acid (48%) is on the verified list but is uniquely hazardous to handle and demands special PPE and engineering beyond gasket choice. Always verify your exact chemical, concentration, and operating temperature against the OEM concentration- and temperature-specific chemical-resistance chart and our Chemical Compatibility Database before you commit.
The mistake to avoid
The single most common error on a tank this size is the gasket. The slate above splits between EPDM and Viton, with Aflas on peracetic acid - putting an EPDM gasket on a strong oxidizer like sodium hypochlorite, hydrogen peroxide, or concentrated sulfuric acid will fail the seal long before the polyethylene shows any wear. The wall material can be right and the fitting still leak. Note too that fittings, bulkhead, and cone outlet hardware are specified and ordered separately from this tank - they are not included - which is exactly why matching the gasket and fitting alloy to the chemical matters. Spec the gasket and fitting off the chemical line above, and review the level gauge selection guide and the tank labeling and NFPA 704 signage requirements for bulk chemical installs. For stand pairing, see the cone bottom tank stand compatibility matrix. If your chemistry exceeds 1.9 specific gravity, the answer is dual-wall containment or a different material, not a heavier poly tank - this is already the densest standard poly rating.
This cone bottom tank ships LTL freight from the Snyder plant in Lincoln, NE, quoted live to your ZIP. Get a freight estimate now with our Freight Cost Estimator, compare containment options in the Snyder Captor Plus 110% containment vs UL-142 SPCC guide, or call 866-418-1777 to confirm fittings, stand, and freight before you order.
