The Snyder Industries 550 Gallon Vertical Double Wall Liquid Chemical Storage Tank is a containment-rated chemical tank built for liquids up to a 1.9 specific gravity, with the integral secondary wall providing secondary containment of the inner tank. Molded in High Density Linear Polyethylene (HDLPE) in opaque white, it holds 550 gallons in a 76-inch by 76-inch footprint and stands 65 inches tall - a compact double-wall vertical storage tank for acids, caustics, and treatment chemicals where SPCC-style secondary containment is required indoors or out.
Will this tank work for your application?
The 1.9 S.G. rating is the number to plan around, and at 1.9 specific gravity this is the highest density rating offered in this footprint - there is no heavier-rated step up to chase. Filled with plain water, the inner tank carries about 4,587 pounds; loaded to its maximum rated contents at 1.9 specific gravity, it is engineered to hold roughly 8,715 pounds of liquid. That headroom is what lets this tank safely store dense chemistry that a standard 1.5 S.G. water tank cannot. Stock fittings shown on the technical drawing for this configuration include a flange, an 18-inch PE threaded/vented fitting, and a manway with 15-inch access. On a double-wall tank the secondary shell makes inner-tank inspection and cleanout harder, so that 15-inch access manway is a genuine spec advantage when this tank needs periodic interior inspection. Reference the technical drawing on this page for the exact fitting locations and orientations before you plumb it. If you are not certain 550 gallons is the right working volume after freeboard, run the numbers with our Tank Sizing Calculator and Tank Sizing Guide, and review freeboard sizing per ASTM D1998 so thermal expansion does not cost you usable capacity.
Chemical compatibility
This tank is molded in HDLPE and rated to 1.9 specific gravity. Verified compatible chemistry from the OEM chemical-resistance chart - which is concentration and temperature specific - includes Acetic Acid (60%), Aluminum Sulfate (50%), Calcium Chloride (40%), DEF (32.5%), Ethylene Glycol (100%), Ferric Chloride (50%), Ferric Sulfate (60%), Ferrous Sulfate (20%), Hydrochloric Acid (37%), Hydrofluoric Acid (48%), Hydrofluosilicic Acid (26%), Hydrogen Peroxide (50%), Magnesium Chloride (30%), Peracetic Acid (30%), Phosphoric Acid (85%), Polyaluminum Chloride, Potassium Carbonate (50%), Potassium Hydroxide (saturated), Propylene Glycol, Sodium Bisulfate, Sodium Bisulfite, Sodium Carbonate (30%), Sodium Hypochlorite (<16.5%), Sodium Thiosulfate (40%), Sulfuric Acid (98%), Urea Solution (50%), Zinc Orthophosphate, and Ozonated Water (up to 10 PPM, where the 10 PPM ceiling is the governing limit for that oxidizer). Fitting and gasket material matter as much as the tank, and the spread here is wider than "PVC and EPDM": PVC fittings with EPDM gaskets cover most salts and milder acids; 98% Sulfuric Acid calls for CPVC; Hydrofluoric, Hydrofluosilicic, Acetic, and Urea use PP or PP/PVC; and DEF, Peracetic Acid, Propylene Glycol, and Zinc Orthophosphate require 316 stainless fittings rather than plastic. On gaskets, Hydrochloric Acid, Hydrofluoric Acid, Hydrofluosilicic Acid, Hydrogen Peroxide, Phosphoric Acid, Sodium Hypochlorite, and Sulfuric Acid all require Viton, while Peracetic Acid uses Aflas. Confirm your exact concentration and material selection against the OEM chart and our Chemical Compatibility Database before ordering valves and fittings.
The mistake to avoid
The single most expensive error on a double-wall chemical tank is mismatching the gasket and fitting material to the chemical, not the tank itself. The HDLPE shell handles the list above, but installing an EPDM gasket on a Sodium Hypochlorite or Sulfuric Acid line - both of which require Viton - is how a "compatible" tank ends up with a leaking outlet within months, and bolting plastic fittings onto a DEF or Peracetic Acid port that calls for 316 stainless is the same mistake from the other direction. The second mistake is undersizing the secondary containment plan: even with the integral outer wall doing its job, dense 1.9 S.G. loads belong behind layered safeguards. Pair this tank with a proper high-level alarm and cutoff strategy from our spillover redundancy engineering guide, choose your level instrument with the level gauge selection guide, and if this is an SPCC site, walk the Snyder Captor SPCC 40 CFR 112 compliance walkthrough.
This Snyder double wall tank ships LTL freight from the Philippi, WV plant (Snyder also molds at a Mississippi facility), and your live quote reflects the actual origin to your ZIP code - get your number in seconds with our Freight Cost Estimator, or call 866-418-1777 to talk through fittings, gasket selection, and lead time. As a vertical double wall storage tank for chemical service, we can spec it to match your exact chemistry.
