The Norwesco N-40797 is a 3000 gallon, 30-degree cone bottom tank molded from polyethylene, standing 134 inches tall on a 96-inch (8-foot) diameter footprint. The steep 30-degree cone is built to drain solids and slurries that a flat-bottom tank would leave behind, which is why it shows up under searches for "cone bottom tank," "Norwesco cone tank," and "cone tank." It carries a 1.5 specific gravity rating, meaning the wall is engineered to hold contents up to 1.5 times the weight of water - the line that decides which chemicals it can safely store.
Will it work for your application?
At 3000 gallons, water alone weighs roughly 25,020 lb, and the tank is rated for contents up to 37,530 lb (3000 gallons at 1.5 specific gravity). Use both numbers when you spec the support: a 30-degree cone tank is always elevated on a stand or saddle, and that structure has to carry the full 37,530 lb rated load, not just the water weight. The 96-inch diameter sets an 8-foot circular footprint - size your concrete pad and any secondary containment basin around that circle - and the 134-inch overall height drives the overhead clearance you need for fill access and venting. Confirm your contents' specific gravity against the 1.5 rating before you fill; anything heavier than 1.5 SG needs a heavier tank, covered below. Dimensions, fitting locations, and the cone geometry are documented on the technical drawing on this page; read it alongside our Tank Sizing Calculator and Tank Sizing Guide to match cone height and stand clearance to your discharge plumbing.
Chemical compatibility
This is a polyethylene tank rated to 1.5 specific gravity. The resin is recorded as HDLPE in our data with a pending verification flag, so confirm whether your unit is HDLPE versus crosslinked (XLPE) with us before committing it to chemical service - the two resins behave differently against certain chemistries. Within the 1.5 SG rating, the chemicals below are compatible at the listed concentrations, each with the fitting and gasket material it requires; always cross-check against the OEM chemical-resistance chart, which is concentration- and temperature-specific. One worth calling out: this tank holds DEF (diesel exhaust fluid) at 32.5% with 316 stainless fittings and EPDM gaskets - a clean fit for a high-demand fluid that falls inside the 1.5 SG envelope.
- 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 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 tank's outlet and bulkhead configuration is not documented in our structured data, so read fitting locations and sizes directly off the technical drawing on this page - and order your bulkheads and gaskets to match the chemistry, not the default. The milder chemicals above run on EPDM, but several of the heavier-tank chemistries below call for Viton or Aflas; spec those sealing parts separately so they match what you are storing.
Chemicals that need a heavier tank
Several common chemicals exceed what a 1.5 SG tank should hold and require a higher 1.9 specific gravity tank instead. Do not store these here: 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. The gasket changes too: sodium hypochlorite and hydrochloric acid call for Viton, sulfuric acid calls for Viton on CPVC fittings, and peracetic acid calls for Aflas - not the EPDM used on the milder list. If you came here for one of these, call 866-418-1777 and we will route you to a 1.9 SG tank that fits. Verify every chemical against our Chemical Compatibility Database before you order.
This tank ships LTL freight from Norwesco's plant in St. Bonifacius, MN, with the rate quoted live to your ZIP - get your number from our Freight Cost Estimator or call 866-418-1777. For a full walkthrough of cone-bottom selection and the 15-degree versus 30-degree versus 45-degree tradeoffs, see our 3000 gallon 30-degree buyer's guide and the Norwesco cone bottom angle selection guide.
3 Year Warranty
