The Snyder Industries 500 Gallon Vertical Double Wall Liquid Chemical Storage Tank is built for aggressive chemical service, with a 1.9 specific-gravity rating that covers dense acids and concentrated solutions most standard 1.5 SG tanks cannot hold. Molded in white High Density Linear Polyethylene as a tank-within-a-tank, the primary vessel carries the chemical while the outer wall provides integral secondary containment - the same Captor-style configuration engineered for SPCC 40 CFR 112 spill-prevention setups. Listed at this price before freight, it stands 81 inches tall on a 53 by 53 inch footprint and ships LTL from Marked Tree, Arkansas, so plan your pad, overhead clearance, and delivery access before you order.
Will this 500 gallon double wall tank work for your application?
The 1.9 SG rating is the headline number, and the weight math is the engineering check. Filled with plain water this tank carries about 4,170 pounds; filled to its rated limit with dense chemistry it carries up to 7,923 pounds. That entire 7,923-pound load sits on a 53 x 53 inch base, so confirm your slab, saddle, or skid rating handles both the weight and the footprint pressure before installation. That margin is exactly why this size is specified for sulfuric acid, ferric chloride, and other heavy chemicals. To match tank volume to your application, run the Tank Sizing Calculator or read the Tank Sizing Guide, and see the technical drawing on this page for exact dimensions and port layout.
Chemical compatibility
This is an HDLPE vessel rated to 1.9 specific gravity, which is already the top SG rung in this family - there is no heavier-rated version to step up to. Because the resin is HDLPE, confirm HDLPE versus XLPE before placing it into chemical service, since cross-link versus linear polyethylene changes resistance for some chemistries. Compatibility also depends on the fitting and gasket materials you select, and every pairing below should be verified against the manufacturer's chemical-resistance chart at your specific concentration and service temperature.
Chemicals this tank can handle with the noted fitting and gasket materials include Sulfuric Acid at 98% (CPVC fittings, Viton gaskets), Hydrochloric Acid at 37% (PVC, Viton), Phosphoric Acid at 85% (PVC, Viton), Hydrofluoric Acid at 48% (PP/PVC, Viton), Hydrofluosilicic Acid at 26% (PP/PVC, Viton), Acetic Acid at 60% (PP/PVC, EPDM), Peracetic Acid at 30% (316SS, Aflas), Hydrogen Peroxide at 50% (PVC, Viton), Sodium Hypochlorite below 16.5% (PVC, Viton), Ferric Chloride at 50% (PVC, EPDM), Ferric Sulfate at 60%, Ferrous Sulfate at 20%, Aluminum Sulfate at 50%, Calcium Chloride at 40%, Magnesium Chloride at 30% (all PVC, EPDM), Sodium Carbonate at 30%, Potassium Carbonate at 50%, Potassium Hydroxide saturated, Sodium Thiosulfate at 40%, Sodium Bisulfate, Sodium Bisulfite (both PVC/PP, EPDM), Polyaluminum Chloride (PVC, EPDM), Zinc Orthophosphate (PP/316SS, EPDM), Ethylene Glycol at 100%, Propylene Glycol (PP/316SS, EPDM), Urea Solution at 50%, DEF at 32.5% (316SS fittings, EPDM gaskets), and ozonated water up to 10 PPM (PVC, EPDM). For full concentration and temperature data, see our Chemical Compatibility Database.
The mistake to avoid
The most common error on double wall chemical tanks is matching the wrong fitting and gasket to the chemistry. Sulfuric acid here calls for CPVC fittings, not the PVC used for milder chemicals, and several oxidizers require Viton over EPDM gaskets. Pairing a 1.9 SG tank with an underrated fitting package undermines the whole install. One thing to know up front: this tank is not sold with a pre-set factory fitting schedule, so confirm bulkhead and outlet sizes and the right fitting/gasket combination for your chemical by phone before ordering rather than assuming a configuration. And do not treat the search-term language - "double wall tank," "vertical storage tank," "500 gallon tank" - as interchangeable specs; verify the actual SG rating and resin against your chemical first. If you are building toward spill-containment compliance, the Snyder Captor double-wall SPCC 40 CFR 112 walkthrough covers the regulatory side, and the tank level gauge selection guide helps you instrument it correctly.
This tank ships LTL freight from the Snyder plant in Marked Tree, Arkansas, quoted live to your ZIP code. Get a freight estimate with the Freight Cost Estimator, or call our team at 866-418-1777 to confirm fittings, SG rating, and lead time for your chemical before you order.
