3900 Gallon 30 Degree Plastic Cone Bottom Tank

The 3900 Gallon 30 Degree Plastic Cone Bottom Tank from Snyder Industries is a 3,900-gallon white polyethylene cone bottom tank built for full-drain chemical and process duty. It carries a 1.9 specific gravity rating, stands 180 inches (about 15 feet) tall on a 90 x 90 inch footprint, and the 30-degree cone discharges heavy solids and slurries instead of letting them settle and cake on a flat floor. The high SG rating is the headline: at 1.9, this tank is built to hold dense chemistry, not just water.

Will it work for your application?

The first install gotcha at this size is not the cone angle - it is the column itself. At 180 inches tall on a 90 x 90 inch footprint, this is a roughly 15-foot vertical column that needs real overhead clearance and a tall, engineered cone-support stand; the tank does not free-stand. The second gotcha is weight. Filled with plain water this tank weighs about 32,526 lb, but its maximum rated contents weight is 61,799 lb - that headroom is exactly what the 1.9 SG rating buys you. As a planning rule, your liquid must weigh under about 15.8 lb per gallon (61,799 lb over 3,900 gallons) to stay inside the rating. Run your specific liquid's weight through the Tank Sizing Calculator and the Tank Sizing Guide before you finalize stand and foundation design. For cone-angle selection across 15, 30, and 45 degree designs, the cone bottom tank buyer's guide walks through how angle affects drain behavior, and the poly-stand guides for the 300 gallon and 310 gallon 30-degree tanks show how the stand pairs with the cone.

Chemical compatibility

This is a polyethylene tank with a 1.9 specific gravity rating - the top SG rating offered in this size and family, so there is no heavier-duty version to step up to. Confirm the exact resin type (such as HDLPE or XLPE) with the manufacturer before placing the tank in chemical service - crosslinked and linear polyethylene behave differently with certain chemistries, and that distinction matters more than any single fitting choice. Based on the OEM chemical-resistance chart - which is concentration and temperature specific - this tank pairs with the following at the noted concentrations:

• 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
• Ethylene Glycol (100%) - PVC fittings, EPDM gaskets
• Ferric Chloride (50%) - PVC fittings, EPDM gaskets
• Ferric Sulfate (60%) - PVC fittings, EPDM gaskets
• Ferrous Sulfate (20%) - PVC fittings, EPDM gaskets
• Hydrochloric Acid (37%) - PVC fittings, Viton gaskets
• Hydrofluoric Acid (48%) - PP/PVC fittings, Viton gaskets
• Hydrofluosilicic Acid (26%) - PP/PVC fittings, Viton gaskets
• Hydrogen Peroxide (50%) - PVC fittings, Viton gaskets
• Magnesium Chloride (30%) - PVC fittings, EPDM gaskets
• Peracetic Acid (30%) - 316SS fittings, Aflas gaskets
• Phosphoric Acid (85%) - PVC fittings, Viton gaskets
• Polyaluminum Chloride - PVC fittings, EPDM gaskets
• Potassium Carbonate (50%) - PVC fittings, EPDM gaskets
• Potassium Hydroxide (saturated) - PVC fittings, EPDM gaskets
• Propylene Glycol - PP/316SS fittings, EPDM gaskets
• Sodium Bisulfate - PVC/PP fittings, EPDM gaskets
• Sodium Bisulfite - PVC/PP fittings, EPDM gaskets
• Sodium Carbonate (30%) - PVC fittings, EPDM gaskets
• Sodium Hypochlorite (<16.5%) - PVC fittings, Viton gaskets
• Sodium Thiosulfate (40%) - PVC fittings, EPDM gaskets
• Sulfuric Acid (98%) - CPVC fittings, Viton gaskets
• Urea Solution (50%) - PP/PVC fittings, EPDM gaskets
• Zinc Orthophosphate - PP/316SS fittings, EPDM gaskets
• Ozonated Water (up to 10 PPM) - PVC fittings, EPDM gaskets

Watch how the fitting and gasket spec shifts with chemistry rather than defaulting to PVC. EPDM holds up to most salts and bases, but the oxidizers and strong acids (hydrogen peroxide, hydrochloric, phosphoric, sulfuric, sodium hypochlorite) call for Viton, peracetic acid demands Aflas, and DEF, peracetic acid, propylene glycol, and zinc orthophosphate move to 316 stainless fittings instead of PVC. Match both the fitting body and the elastomer to the chemical. Ozonated water is the one exception in this list with no dedicated database page yet and a hard cap of 10 PPM - call before ordering for that service. Cross-check your exact concentration and temperature in the Chemical Compatibility Database before ordering.

The mistake to avoid

The costliest error on a tank this size is treating the 1.9 SG rating as a license to skip verification. The SG rating governs the wall thickness the tank was built to - run a liquid heavier than about 15.8 lb per gallon and you risk wall failure under static head, especially near the cone where pressure concentrates. Do not assume the resin type either: confirm both the SG rating and the resin against the technical drawing on this page and the OEM chart before you commit a chemical to it.

This 3900 Gallon 30 Degree Cone Bottom Tank ships LTL freight from Snyder Industries in Lincoln, NE, quoted live to your ZIP. Get your exact rate with the Freight Cost Estimator or call 866-418-1777 - our team can confirm the cone-stand pairing, fitting package, and lead time for your chemistry before you order.