350 Gallon Cone Bottom Tank

The Norwesco 350 Gallon Cone Bottom Tank (SKU N-41485) is a white polyethylene tank built for batching, settling, and full-drain dispensing where you need the contents to flow out completely instead of leaving a heel in a flat bottom.It stands 58 inches tall on a 52 x 52 inch footprint and carries a 1.5 specific gravity rating, which is the number that decides whether this cone bottom tank is right for your chemical.Full of water it holds about 2,919 lb; at its maximum rated contents weight it is engineered for roughly 4,378 lb, the figure that corresponds to a fluid sitting at the 1.5 SG ceiling.Size your stand and outlet hardware to that 4,378 lb number, not the 2,919 lb water weight, if you are storing a near-1.5-SG fluid.To match capacity to your process volume and refill cycle, run the Tank Sizing Calculator or read the Tank Sizing Guide.

Will it work for your application?

Cone bottom geometry is chosen for one reason: it drains.The sloped floor moves liquid and settled solids toward the center outlet, which is why this style is favored for mixing, chemical metering, and dosing where you want every batch to clear.See the technical drawing on this page for the cone angle, outlet location, and overall dimensions, and use those to plan your stand and plumbing.Because a cone bottom tank carries its load through a stand rather than sitting flat, the 4,378 lb max rated weight and the 52 x 52 inch footprint both feed directly into your structural design.The fill, vent, and outlet port sizes are not listed in our data here, so confirm your exact port configuration by phone at 866-418-1777 or from the technical drawing before you order plumbing.Outlet sizing on a cone is its own discipline if you are running solids, settling sludge, or precipitate, so review our guide on cone-bottom outlet sizing for high-solids vs low-solids service before you commit to a valve size.

Chemical compatibility

This is a 1.5 specific gravity polyethylene tank.The resin is recorded as HDLPE in our data but flagged for confirmation, so confirm whether the actual wall is HDLPE or XLPE with us at 866-418-1777 before any chemical goes in it.That confirmation matters most for the oxidizers and strong acids, where linear and crosslinked polyethylene diverge sharply in service life.The chemicals below are compatible with a 1.5 SG tank like this one at the listed concentrations.Note that this tank is rated for DEF (diesel exhaust fluid) at 32.5% and urea solution at 50% on 316SS fittings with EPDM gaskets, which makes the cone bottom geometry a clean fit for full-drain dispensing of those fluids.Always size fittings and gaskets from the chemical, not the tank, and verify against the OEM chemical-resistance chart for your exact concentration and operating temperature:

• Acetic Acid at 60% - PP/PVC fittings, EPDM gaskets
• Aluminum Sulfate at 50% - PVC fittings, EPDM gaskets
• Calcium Chloride at 40% - PVC fittings, EPDM gaskets
• DEF (diesel exhaust fluid) at 32.5% - 316SS fittings, EPDM gaskets
• Ferrous Sulfate at 20% - PVC fittings, EPDM gaskets
• Magnesium Chloride at 30% - PVC fittings, EPDM gaskets
• Sodium Carbonate at 30% - PVC fittings, EPDM gaskets
• Urea Solution at 50% - PP/PVC fittings, EPDM gaskets
• Ozonated Water up to 10 PPM - PVC fittings, EPDM gaskets

The mistake to avoid: SG, not gallons

The most common cone bottom sizing error is buying to gallons and ignoring specific gravity.This tank is rated to 1.5 SG.Several chemicals you might expect to store here actually require a heavier-walled 1.5 SG tank, and putting them in a 1.5 SG shell is how walls fatigue early.If your service is 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, or Zinc Orthophosphate, step up to a 1.5 SG tank.Several of those also need non-EPDM seals: Viton on hydrochloric, hydrofluoric, hydrofluosilicic, hydrogen peroxide, phosphoric, sodium hypochlorite, and sulfuric acid (CPVC fittings on sulfuric), and Aflas on peracetic acid.Call 866-418-1777 and we will spec the right tank, fitting, and gasket combination.The full picture lives in our Chemical Compatibility Database.

Get the right top and gauge layout

Where the fill, vent, level gauge, and drain land on the top affects cross-contamination, maintenance access, and operator error far more than most buyers expect.Plan it with our guide on top fitting placement strategy, choose the right instrument with our level gauge selection guide, and label the installation correctly using our tank label and signage compliance reference.

This tank ships LTL freight from Burnet, TX, with the rate quoted live to your ZIP.Get a number in seconds with our Freight Cost Estimator, or call 866-418-1777 and we will confirm the resin, match the right SG rating and gasket to your chemical, and arrange delivery.