The Snyder Industries 405 Gallon Vertical Double Wall Liquid Chemical Storage Tank pairs an inner primary tank with an integral secondary containment wall in one unit, molded from High Density Linear Polyethylene (HDLPE) and rated to a 1.9 specific gravity. That 1.9 rating is the headline number for a chemical buyer: it tells you this tank is built to hold dense liquids that would overstress a standard 1.5 SG vessel. The tank stands 73 inches tall on a 48 x 48 inch footprint, holds 405 gallons nominal, and carries ASTM certification. Buyers searching for a vertical storage tank, a double wall tank, or a Snyder vertical tank for chemical duty land here for one reason: the double-wall construction gives you built-in spill containment without pouring a separate concrete dike.
Will this tank work for your application?
Start with weight, because that drives both your pad and your freight. Filled with water this tank carries roughly 3,378 lb; loaded to its maximum rated contents at 1.9 SG it reaches about 6,418 lb. Size your foundation and any anchoring for the loaded figure that matches your chemical's density, not the water number. Remember that 405 gallons is the nominal capacity, not the usable working volume: ASTM D1998 freeboard means you fill below the brim, so review our double-wall freeboard sizing guide for the real volume you can actually use before you size to 405. The tank ships with an 18-inch PE threaded/vented fitting and a manway with 15-inch access, so you have a top opening sized for inspection, cleaning, and a level gauge or vent (see our level gauge selection guide for radar, ultrasonic, hydrostatic, and magnetostrictive options). Because this tank ships LTL from Snyder's plant in Chowchilla, California, East Coast buyers should factor both transit time and freight into their planning early. Run your numbers through the Tank Sizing Calculator and the Tank Sizing Guide, and review the technical drawing on this page for exact port locations.
Chemical compatibility
This is an HDLPE resin tank rated to 1.9 specific gravity. Always work from the OEM chemical-resistance chart, which is concentration- and temperature-specific, and match your fitting and gasket materials to the chemical, not just the tank wall. At 1.9 SG this is already the heavy-duty rating for the chemistry below, so for these chemicals you do not need to step up to a denser vessel. Verified-compatible chemicals for this resin and SG rating include:
- Sulfuric Acid at 98% (CPVC fittings, Viton gasket)
- Hydrochloric Acid at 37% (PVC fittings, Viton gasket)
- Phosphoric Acid at 85% (PVC fittings, Viton gasket)
- Hydrofluoric Acid at 48% (PP/PVC fittings, Viton gasket)
- Sodium Hypochlorite at <16.5% (PVC fittings, Viton gasket)
- Hydrogen Peroxide at 50% (PVC fittings, Viton gasket)
- Ferric Chloride at 50% (PVC fittings, EPDM gasket)
- Aluminum Sulfate at 50% (PVC fittings, EPDM gasket)
- Potassium Hydroxide at saturated (PVC fittings, EPDM gasket)
- DEF at 32.5% (316SS fittings, EPDM gasket)
- Urea Solution at 50% (PP/PVC fittings, EPDM gasket)
- Peracetic Acid at 30% (316SS fittings, Aflas gasket)
- Acetic Acid at 60% (PP/PVC fittings, EPDM gasket)
- Calcium Chloride at 40% (PVC fittings, EPDM gasket)
- Ethylene Glycol at 100% (PVC fittings, EPDM gasket)
- Ferric Sulfate at 60%, Ferrous Sulfate at 20%, Magnesium Chloride at 30%, Sodium Carbonate at 30%, Potassium Carbonate at 50%, Sodium Thiosulfate at 40% (all PVC fittings, EPDM gasket)
- Hydrofluosilicic Acid at 26% (PP/PVC fittings, Viton gasket)
- Polyaluminum Chloride (PVC fittings, EPDM gasket), Sodium Bisulfate and Sodium Bisulfite (PVC/PP fittings, EPDM gasket)
- Propylene Glycol and Zinc Orthophosphate (PP/316SS fittings, EPDM gasket)
- Ozonated Water up to 10 PPM (PVC fittings, EPDM gasket)
Confirm your exact concentration and operating temperature against the OEM chart, then browse our full Chemical Compatibility Database for the entry that matches your service.
The mistake to avoid
The most common error on a double-wall chemical tank is under-rating the gasket. The wall resin is only half the seal. Use this quick rule from the table above: strong acids and oxidizers (sulfuric, hydrochloric, phosphoric, hydrofluoric, hydrofluosilicic, hydrogen peroxide, sodium hypochlorite) take Viton; peracetic acid takes Aflas; everything else on the list takes EPDM. Pairing an aggressive oxidizer with an EPDM gasket is how operators get a tank that passes initial inspection and then leaks at the fitting months later. Match the fitting and gasket material to your chemical, and verify the loaded SG of your chemical does not exceed the 1.9 rating. For deeper compliance reading, see our walkthroughs on SPCC 40 CFR 112 compliance and HDPE wall thickness at the vapor-saturated headspace, where premature failures originate.
This tank ships LTL freight from the Snyder plant in Chowchilla, California, with shipping quoted live to your ZIP code. Get a real number now with our Freight Cost Estimator, or call 866-418-1777 to confirm fittings, gasket selection, and delivery for your project.
