The Snyder Industries 6500 Gallon Vertical Double Wall Liquid Chemical Storage Tank is built for outdoor, secondary-contained chemical service where a spill is not an option. It is a double wall tank: a primary chemical tank nested inside an integral outer containment shell, molded from High Density Linear Polyethylene in opaque white. That outer shell provides the integral 100%-plus secondary containment that 40 CFR 112 (SPCC) requires, which is exactly why operators choose this over a single-wall tank with a separate dike or berm. It carries a 1.9 specific gravity rating, which is what lets it hold dense liquids like 98% sulfuric acid or 50% ferric chloride to its full 6,500-gallon working level without exceeding the wall's design load. Footprint is 120 in by 120 in with an overall height of 199 in, so plan your pad and overhead clearance before it arrives.
Will it work for your application?
Start with weight, because at this size it governs the foundation. Filled with water this tank carries roughly 54,210 lb; at its 1.9 SG rating the primary can hold up to about 102,999 lb of contents. Your concrete pad and any ring wall have to be engineered for that loaded weight on the 120 x 120 in footprint, fully supported edge to edge. The technical drawing on this page shows three molded-in fittings: a flange, an 18" PE threaded/vented fitting, and a manway with 15" access for inspection, gauging, and cleanout. On a tank this size a wrong outlet position is a return-freight disaster, so confirm the exact fitting locations and sizes against the on-page drawing before you order. Match the rest of your fitting hardware to the chemical, not to the tank, since the polyethylene shell is far more chemical-tolerant than most metals and gaskets. This is a classic vertical storage tank / double wall tank configuration for bulk chemical feed and storage.
Chemical compatibility
The tank wall is HDLPE rated to 1.9 specific gravity, which clears the full chemical list below for storage at the stated concentrations and ambient temperature. At 1.9 SG this is the heaviest-duty wall Snyder molds in this size, so there is no higher-SG tank to step up to for dense acids and oxidizers; you are not leaving capability on the table. Always confirm against our Chemical Compatibility Database for your exact concentration and operating temperature, and spec fitting and gasket materials per chemical, not per tank:
- Sulfuric Acid 98% (CPVC fittings, Viton gaskets)
- Hydrochloric Acid 37% (PVC, Viton)
- Phosphoric Acid 85% (PVC, Viton)
- Hydrofluoric Acid 48% (PP/PVC, Viton)
- Hydrofluosilicic Acid 26% (PP/PVC, Viton)
- Acetic Acid 60% (PP/PVC, EPDM)
- Peracetic Acid 30% (316SS, Aflas)
- Hydrogen Peroxide 50% (PVC, Viton)
- Sodium Hypochlorite <16.5% (PVC, Viton)
- Ferric Chloride 50% (PVC, EPDM)
- Ferric Sulfate 60% (PVC, EPDM)
- Ferrous Sulfate 20% (PVC, EPDM)
- Aluminum Sulfate 50% (PVC, EPDM)
- Polyaluminum Chloride (PVC, EPDM)
- Calcium Chloride 40% (PVC, EPDM)
- Magnesium Chloride 30% (PVC, EPDM)
- Sodium Carbonate 30% (PVC, EPDM)
- Potassium Carbonate 50% (PVC, EPDM)
- Potassium Hydroxide saturated (PVC, EPDM)
- Sodium Bisulfate (PVC/PP, EPDM)
- Sodium Bisulfite (PVC/PP, EPDM)
- Sodium Thiosulfate 40% (PVC, EPDM)
- Zinc Orthophosphate (PP/316SS, EPDM)
- DEF 32.5% (316SS fittings, EPDM)
- Urea Solution 50% (PP/PVC, EPDM)
- Ethylene Glycol 100% (PVC, EPDM)
- Propylene Glycol (PP/316SS, EPDM)
- Ozonated Water up to 10 PPM (PVC, EPDM)
Full concentration, temperature, and gasket guidance lives in our Chemical Compatibility Database. The most common and costly mistake on a tank this size is the fitting and gasket pairing: sulfuric acid needs CPVC over standard PVC, and the strong oxidizers want Viton or Aflas rather than EPDM. Get the fitting train wrong and you leak at the bulkhead long before the tank wall ever fails. DEF and urea solution are a special case: both are purity-critical, so every wetted part in the fill and draw train must be 316 stainless or a compatible plastic per ISO 22241 with no carbon steel, brass, or copper anywhere, or you contaminate the fluid.
Freight and ordering
This tank ships LTL from the Snyder plant in Lincoln, NE, with freight quoted live to your ZIP. Run your delivery cost on our Freight Cost Estimator, and use the Tank Sizing Calculator and Tank Sizing Guide to confirm 6,500 gallons is the right working volume for your feed rate and containment requirement. For the double wall containment and SPCC reasoning, see our walkthrough on Snyder Captor double-wall tanks for SPCC 40 CFR 112 compliance, and for instrumenting the manway see Tank Level Gauge Selection for Chemical Service. Note that some published 6500-gallon guides cite slightly different diameters and heights across mold generations; the spec table and drawing on this page govern this exact tank. Questions on fittings, layout, or scheduling a delivery? Call 866-418-1777.
