The Snyder Industries 4000 Gallon HDLPE Vertical Double Wall Liquid Chemical Storage Tank is a 1.5 specific-gravity-rated vertical tank built for chemical containment without a separate concrete berm. It stands 178 inches tall on a 102 x 102 inch footprint, holds 4000 gallons, and is molded in white High Density Linear Polyethylene by Snyder Industries. The integral outer wall serves as secondary containment, so this double wall design replaces the cost and footprint of building a containment dike around a single-wall tank.
Will it work for your application?
This is a 1.5 SG vertical tank, meaning the inner wall is engineered for liquids weighing up to 1.5 times the density of water. The 4000 gallons is a nominal volume: full of water the contents alone reach 33,360 lb, and at the maximum rated 1.5 SG the inner tank is built to carry up to 50,040 lb of contents. Because that rated weight assumes the heavier chemical, not water, plan your usable fill below nominal once freeboard for thermal expansion is subtracted, and use the figures to confirm your pad and foundation can support a loaded double wall vertical tank of this size. The tank comes configured with a top flange, an 18-inch PE threaded/vented fitting, and a manway with 15-inch access for entry, gauging, and venting; the exact fitting locations and elevations are shown on the technical drawing on this page. Confirm your fill, vent, and outlet plumbing match the supplied flange and threaded fitting before you order, and run your numbers through the Tank Sizing Calculator and Tank Sizing Guide to verify usable volume after freeboard. Buyers shopping this tank often search it as a vertical storage tank, vertical tank, or simply a double wall tank from Snyder.
Chemical compatibility
This tank is HDLPE rated to 1.5 specific gravity. Within that 1.5 SG rating it pairs with the following chemicals at the listed concentrations, fitting materials, and gasket materials per the Snyder chemical-resistance chart, which is concentration- and temperature-specific:
- Acetic Acid at 60% — PP/PVC fittings, EPDM gaskets
- Aluminum Sulfate at 50% — PVC fittings, EPDM gaskets
- Calcium Chloride at 40% — PVC fittings, EPDM gaskets
- DEF at 32.5% — 316SS fittings, EPDM gaskets
- Ferrous Sulfate at 20% — PVC fittings, EPDM gaskets
- Magnesium Chloride at 30% — PVC fittings, EPDM gaskets
- Sodium Carbonate at 30% — PVC fittings, EPDM gaskets
- Urea Solution at 50% — PP/PVC fittings, EPDM gaskets
- Ozonated Water up to 10 PPM — PVC fittings, EPDM gaskets
Several heavier chemicals are not a match for this 1.5 SG tank and require a 1.9 SG tank instead, and they often demand upgraded wetted materials too. Sulfuric Acid calls for CPVC fittings with Viton gaskets, Sodium Hypochlorite, Hydrochloric Acid, Phosphoric Acid, and Hydrogen Peroxide all need Viton gaskets, and Peracetic Acid needs 316SS fittings with Aflas gaskets. Others on the 1.9 SG list include Ferric Chloride, Ethylene Glycol, and Potassium Hydroxide. If your chemistry is on that list, size up to the 1.9 SG version and re-spec the fittings and gaskets to match. Always confirm your specific concentration and operating temperature in the Chemical Compatibility Database before purchase.
The mistake to avoid
The most common error on a double wall chemical tank is matching the resin and SG rating but ignoring the fitting and gasket metallurgy. Notice that several of the chemicals above call for Viton or Aflas gaskets and PP, CPVC, or 316SS fittings rather than the standard PVC/EPDM package — DEF, for example, wants 316SS. Specify the wetted fitting and gasket materials to match your actual chemical and concentration. Just as important, plan a way to watch the annular space between the walls: locate an interstitial leak-detection or monitoring point and confirm its position against the fitting layout on the technical drawing before installation. For double wall containment design, freeboard, and high-level safeguards, see our guides on Snyder Captor double-wall tanks for SPCC 40 CFR 112 compliance, freeboard sizing per ASTM D1998, tank level gauge selection for chemical service, and spillover redundancy and high-level alarm architecture.
This tank ships LTL freight from the Snyder plant in Lincoln, NE, with freight quoted live to your ZIP. Get your quote with our Freight Cost Estimator, or call 866-418-1777 to confirm fitting configuration, gasket selection, and lead time before you order.
