The Enduraplas 3000 Gallon 15 Degree Plastic Cone Bottom Tank with Stand (SKU EP-THC03000KWH) is a closed-top, 15-degree cone-bottom polyethylene tank built for full-drain chemical and process service. It stands 146 inches tall on a 90-inch diameter footprint, holds a nominal 3000 gallons, ships in white, and weighs about 1000 lb empty. The 15-degree cone drains toward a 3-inch outlet, and a 16-inch lid sits on the closed top. This tank carries a 1.9 specific gravity rating — the ceiling for a poly tank — so it is engineered for dense liquids that a standard 1.5 SG water tank cannot safely hold. If you are cross-shopping an enduraplas tank against other 3000 gallon cone bottom options, the drain angle and SG rating are the two specs that matter most.
Will it hold your liquid and mount correctly?
Full of water this tank carries roughly 25,020 lb, and at its 1.9 SG rating the closed top is engineered for contents up to about 47,538 lb. That headroom is why the cone-and-stand design suits heavier chemistries rather than plain water storage. The stand supports the cone so the tank drains completely through the bottom 3-inch outlet, and the closed top with 16-inch lid keeps the contents sealed and accessible for fill and inspection. Confirm your pad can carry the loaded weight over the 90-inch diameter footprint before you set it. Use the Tank Sizing Calculator and the Tank Sizing Guide to match your volume and turnover to this vessel, and see the technical drawing on this page for exact cone geometry and outlet placement.
Chemical compatibility
This tank is molded polyethylene with a 1.9 SG rating. The resin is recorded as HDLPE but is not yet confirmed, so before any chemical service confirm HDLPE versus XLPE with us, since the two crosslink grades resist different chemistries. Compatibility below is drawn from the Snyder Industries OEM chemical resistance chart and is concentration- and temperature-specific — verify your exact chemical, concentration, temperature, and the fitting and gasket materials before committing. Because this tank is rated at the full 1.9 SG, it covers every chemistry below — including lighter, lower-SG-rated liquids — so if you are sizing for a 1.5-SG chemical you have full headroom to spare rather than a compatibility gap.
Chemistries that need the full 1.9 rating include ethylene glycol (100%, PVC fittings, EPDM gaskets), ferric chloride (50%, PVC/EPDM), ferric sulfate (60%, PVC/EPDM), hydrochloric acid (37%, PVC fittings with Viton gaskets), hydrofluoric acid (48%, PP/PVC with Viton), hydrofluosilicic acid (26%, PP/PVC with Viton), hydrogen peroxide (50%, PVC/Viton), peracetic acid (30%, 316SS fittings with Aflas gaskets), phosphoric acid (85%, PVC/Viton), polyaluminum chloride (PVC/EPDM), potassium carbonate (50%, PVC/EPDM), potassium hydroxide (saturated, PVC/EPDM), propylene glycol (PP/316SS with EPDM), sodium bisulfate and sodium bisulfite (PVC/PP with EPDM), sodium hypochlorite (under 16.5%, PVC/Viton), sodium thiosulfate (40%, PVC/EPDM), sulfuric acid (98%, CPVC with Viton), and zinc orthophosphate (PP/316SS with EPDM). Lower-SG-rated chemistries this tank also covers with room to spare include acetic acid (60%), aluminum sulfate (50%), calcium chloride (40%), ferrous sulfate (20%), magnesium chloride (30%), sodium carbonate (30%), and ozonated water (up to 10 PPM). Match every fitting and gasket to your chemical — see our full Chemical Compatibility Database.
DEF and urea bulk storage
If you are shopping this 3000 gallon tank for DEF, note the details. DEF (32.5%) and urea solution (50%) both run against EPDM gaskets, but DEF calls for 316SS fittings while urea takes PP or PVC. DEF is purity-sensitive, so keeping the wetted metal and gasket materials correct protects the fluid as much as the tank. The full 1.9 SG rating gives these lighter fluids ample headroom on a vessel this size.
The mistake to avoid
The most common error on a cone-bottom chemical tank is pairing the right vessel with the wrong gasket or fitting. Sodium hypochlorite, hydrochloric acid, phosphoric acid, and sulfuric acid all need Viton gaskets — not the EPDM used for glycols and salts — and sulfuric acid specifically steps the outlet fitting up to CPVC. Peracetic acid is a further outlier: it requires an Aflas gasket with a 316SS fitting, so neither EPDM nor Viton is correct there. Get the outlet fitting material and gasket right for your specific chemistry and concentration, and confirm the resin grade before you order.
This tank ships LTL freight from the nearest Enduraplas plant — Converse, TX or Neche, ND — quoted live to your ZIP. Get your number instantly with the Freight Cost Estimator or call 866-418-1777. For sizing and selection help, read our 3000 Gallon 15 Degree Cone Bottom Tank: Complete Buyer's Guide.
