The Enduraplas 550 Gallon Green Cone Bottom Tank with Stand (SKU THC00550KG) is a full-drain chemical storage and mixing tank built for operations that need to empty completely between batches. The cone bottom drives every drop toward the outlet, and the included stand elevates the vessel so the cone tip drains clear of the floor. It stands 69 inches tall on a 60-inch diameter footprint, weighs 150 pounds empty, and carries an FDA-approved polyethylene build rated to a 1.9 specific gravity - one of the heaviest content ratings offered in this cone-bottom family, which makes it the right pick when your product is dense.
Will it work for your process?
The tank ships with a 3-inch PP female NPT bulkhead fitting at the cone tip for drain or transfer, and a 16-inch threaded vented manway up top for filling, dosing, and inspection. The vent on the manway matters: it lets the tank breathe as you draw down so you do not pull a vacuum against the walls. Sizing is the number that decides your stand and slab: full of water this tank carries about 4,587 pounds, and at its maximum 1.9 SG rating the contents can reach roughly 8,715 pounds. Size your floor and any anchoring against that 8,715-pound figure, not the water weight. The 1.9 rating is also a hard fill ceiling - if your product is denser than 1.9 specific gravity, you cannot fill to the top; drop the fill line so total contents stay under the rated load. If you are still choosing between capacities or stand types, our Tank Sizing Calculator, Tank Sizing Guide, and the 550 gallon cone bottom buyer's guide walk through the decision. For steel-frame versus polyethylene stand tradeoffs and cross-brand fit, see the stand selection decision tree and the Norwesco, Snyder, and Enduraplas compatibility matrix.
Chemical compatibility
This is a polyethylene tank with a 1.9 specific gravity rating. The resin is recorded as HDLPE but not fully confirmed, so verify HDLPE versus XLPE with us before committing to chemical service - crosslinked and linear polyethylene do not carry identical chemical resistance. Compatibility below is drawn from the Snyder Industries OEM chemical resistance chart and is concentration- and temperature-specific; confirm your exact chemical, concentration, temperature, and both fitting and gasket material before ordering.
At the full 1.9 SG rating this tank handles heavy contents such as Ethylene Glycol (100%), Ferric Chloride (50%), Ferric Sulfate (60%), Hydrochloric Acid (37%), Hydrofluoric Acid (48%), Hydrofluosilicic Acid (26%), Hydrogen Peroxide (50%), Peracetic Acid (30%), Phosphoric Acid (85%), Polyaluminum Chloride, Potassium Carbonate (50%), Potassium Hydroxide (saturated), Propylene Glycol, Sodium Bisulfate, Sodium Bisulfite, Sodium Hypochlorite (<16.5%), Sodium Thiosulfate (40%), Sulfuric Acid (98%), and Zinc Orthophosphate. The wetted-part callouts vary sharply: Sulfuric Acid at 98% needs CPVC fittings with Viton, several acids and Sodium Hypochlorite call for Viton gaskets rather than EPDM, and Peracetic Acid needs 316SS fittings with Aflas.
Lower-density chemicals also run in this tank - Acetic Acid (60%), Aluminum Sulfate (50%), Calcium Chloride (40%), Magnesium Chloride (30%), Sodium Carbonate (30%), Ferrous Sulfate (20%), DEF (32.5%), Urea Solution (50%), and ozonated water (up to 10 PPM). DEF is the one to watch on fittings: the chart specifies 316SS wetted parts with EPDM to keep the fluid uncontaminated, so the tank's as-shipped 3-inch PP bulkhead is not DEF-appropriate and must be swapped. Urea Solution runs on PP or PVC with EPDM. See the full Chemical Compatibility Database to match your fitting and gasket build.
The mistake to avoid
Do not assume the included fittings carry across every chemical. The polyethylene wall is compatible with a long list of acids, but the metal or plastic at the outlet and the gasket at every seal fail first - PVC where Viton is required, PP where the chart calls for 316SS or CPVC. The as-shipped 3-inch PP bulkhead is not universal: Sulfuric Acid at 98% needs CPVC with Viton, Peracetic Acid needs 316SS with Aflas, and DEF needs 316SS. Match the wetted-part callouts above to your exact chemical, plan to replace the outlet fitting where the chart requires it, and confirm the HDLPE-versus-XLPE resin question with us before you fill. Reference the technical drawing on this page for fitting locations and manway placement.
This tank ships LTL freight from the Enduraplas plant in Neche, ND, quoted live to your ZIP - get your number with the Freight Cost Estimator or call 866-418-1777. Buyers commonly search this unit as a 550 gallon tank, Enduraplas green cone bottom, and cone bottom tank with stand.
