Enduraplas 550 Gallon Black Cone Bottom Tank

The Enduraplas 550 Gallon Black Cone Bottom Tank is a 550-gallon polyethylene cone-bottom tank built for processes that need to drain completely - the angled bottom empties to the center outlet so solids and sediment don't settle and stay behind. Molded in black at a 1.9 specific gravity rating, this is a high-SG vessel engineered for heavier chemical contents, not just water. It stands 59 inches tall on a 60 x 60 inch footprint, so plan your stand and overhead clearance to that envelope before ordering.

Will it work for your job?

This cone bottom tank holds 550 gallons. At a 1.0 specific gravity (water), a full tank carries about 4,587 pounds; the 1.9 SG rating means the tank shell is engineered to support contents up to roughly 8,715 pounds, which is what lets it handle dense chemicals rather than just water. Use that max-contents figure to size the stand, the slab, and any anchoring - a cone bottom tank must sit in a matched stand or structural ring, never directly on a flat pad. The 60 x 60 inch footprint and 59-inch height define your space; confirm both before ordering. For help matching this body to the right support, see our Cone Bottom Tank Stand Compatibility Matrix, and run your contents through the Tank Sizing Calculator or the Tank Sizing Guide. Buyers cross-shopping the 20-degree cone configuration will also find the 550 Gallon 20 Degree Cone Bottom Tank buyer's guide and the poly-stand version useful for spec'ing the full assembly. This tank ships without pre-installed bulkheads or valves - fittings are selected to match your chemical (see the pairing below) and are not factory-installed, so confirm outlet size and fitting locations on the technical drawing on this page.

Chemical compatibility

This tank is molded from high-density polyethylene at a 1.9 specific gravity rating - the heaviest-duty body in the cone-bottom line, so no higher-SG step-up is needed for any chemical listed here. The OEM lists the resin as HDLPE; confirm the resin against the technical drawing on this page before committing it to aggressive chemical service. The compatibility below is drawn from the OEM chemical-resistance chart and is concentration- and temperature-specific - always match your exact concentration and operating temperature to that chart before ordering.

Gasket and fitting rule first: EPDM is the default gasket for most of the list; oxidizers and strong acids - hydrogen peroxide, sodium hypochlorite, sulfuric acid, phosphoric acid, hydrochloric acid, hydrofluoric acid, and hydrofluosilicic acid - require Viton, and peracetic acid requires Aflas. Four chemicals need metal rather than plastic fittings: DEF and Peracetic Acid call for 316 stainless steel, and Propylene Glycol and Zinc Orthophosphate call for PP or 316 stainless. A buyer spec'ing PVC for DEF will fail - match the fitting material to the chemical, not just the tank.

Chemicals this tank can hold, with the fitting and gasket materials to pair with each: Acetic Acid 60% (PP/PVC fittings, EPDM gaskets), Aluminum Sulfate 50% (PVC, EPDM), Calcium Chloride 40% (PVC, EPDM), DEF 32.5% (316SS, 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), Peracetic Acid 30% (316SS, Aflas), Phosphoric Acid 85% (PVC, Viton), Polyaluminum Chloride (PVC, EPDM), Potassium Carbonate 50% (PVC, EPDM), Potassium Hydroxide saturated (PVC, EPDM), Propylene Glycol (PP/316SS, EPDM), Sodium Bisulfate (PVC/PP, EPDM), Sodium Bisulfite (PVC/PP, EPDM), Sodium Carbonate 30% (PVC, EPDM), Sodium Hypochlorite under 16.5% (PVC, Viton), Sodium Thiosulfate 40% (PVC, EPDM), Sulfuric Acid 98% (CPVC, Viton), Urea Solution 50% (PP/PVC, EPDM), Zinc Orthophosphate (PP/316SS, EPDM), and Ozonated Water up to 10 PPM (PVC, EPDM). Click any chemical in our Chemical Compatibility Database to confirm the detail for your service.

The mistake to avoid

The most common error on a high-SG chemical tank is matching the right tank body to the wrong fittings and gaskets. The 1.9 SG shell carries the weight, but the bulkhead, valve, and gasket materials must independently match the chemical - Sulfuric Acid 98% needs CPVC fittings and Viton gaskets, while DEF and Peracetic Acid call for 316 stainless. The second error is treating the tank as a closed question on resin and level: this tank is black, so you cannot gauge fluid level visually, and you should confirm the HDLPE resin against the technical drawing before storing any aggressive chemical. When in doubt, confirm against the OEM resistance chart and our database.

This tank ships LTL freight from the Enduraplas plant in Neche, ND, with the rate quoted live to your ZIP - get your number from the Freight Cost Estimator or call 866-418-1777. Searching for a black cone bottom tank or a high-SG cone tank for chemical service? This 550-gallon Enduraplas is built for it. Verify your chemical, concentration, and fittings against the Chemical Compatibility Database and the technical drawing on this page before you order.