The Snyder Industries 250 Gallon HDLPE Vertical Double Wall Liquid Chemical Storage Tank is built for active chemical service, pairing a molded high-density linear polyethylene primary tank with an integral secondary containment shell so a leak in the primary is caught without a separate dike or basin. It carries a 1.9 specific gravity rating and stands 83 inches tall on a 34 x 34 inch footprint, holding full-strength solutions while keeping its plan space tight. This is the configuration buyers look for as a vertical storage tank or double wall tank in the 250 gallon class, and Snyder backs it with ASTM certification.
Will this tank work for your application?
The primary tank holds 250 gallons. Water alone fills it at roughly 2,085 pounds, but the 1.9 SG rating means the structure is engineered to carry up to about 3,962 pounds of denser chemical contents - that weight headroom is the whole reason to buy a chemical-rated tank over a water tank. Run your fill weight through the Tank Sizing Calculator and the Tank Sizing Guide against your stand or slab before you order. Per the drawing, access is through two ports: a 14-inch PE threaded and vented lid for fill and venting, and a manway with 11-3/8-inch access for interior reach. There is no separate side or bottom outlet shown on the drawing fittings, so any level gauge, dip tube, or pump return has to tee off or share those two openings - plan your instrumentation around that before ordering. See the technical drawing on this page for the exact layout and dimensions.
Chemical compatibility
The tank wall is HDLPE rated to 1.9 specific gravity, which covers the dense acids and concentrated solutions that overwhelm a standard 1.5 SG water tank - in fact 1.9 SG already handles the heaviest services in the list below, including 98% sulfuric, 85% phosphoric, and 50% ferric chloride, so you will not need a heavier-rated tank for these chemicals. Resin compatibility is only half the picture, though: the fitting and gasket materials below are matched to each chemical, so spec the hardware to the service, not just the tank. Each chemical is confirmed against the OEM chemical-resistance chart at the listed concentration; resistance is always concentration- and temperature-specific, so confirm your exact service conditions first.
- Acetic Acid (60%) - PP/PVC fittings, EPDM gaskets
- Aluminum Sulfate (50%) - PVC fittings, EPDM gaskets
- Calcium Chloride (40%) - PVC fittings, EPDM gaskets
- DEF (32.5%) - 316SS fittings, EPDM gaskets
- Ethylene Glycol (100%) - PVC fittings, EPDM gaskets
- Ferric Chloride (50%) - PVC fittings, EPDM gaskets
- Ferric Sulfate (60%) - PVC fittings, EPDM gaskets
- Ferrous Sulfate (20%) - PVC fittings, EPDM gaskets
- Hydrochloric Acid (37%) - PVC fittings, Viton gaskets
- Hydrofluoric Acid (48%) - PP/PVC fittings, Viton gaskets
- Hydrofluosilicic Acid (26%) - PP/PVC fittings, Viton gaskets
- Hydrogen Peroxide (50%) - PVC fittings, Viton gaskets
- Magnesium Chloride (30%) - PVC fittings, EPDM gaskets
- Peracetic Acid (30%) - 316SS fittings, Aflas gaskets
- Phosphoric Acid (85%) - PVC fittings, Viton gaskets
- Polyaluminum Chloride - PVC fittings, EPDM gaskets
- Potassium Carbonate (50%) - PVC fittings, EPDM gaskets
- Potassium Hydroxide (saturated) - PVC fittings, EPDM gaskets
- Propylene Glycol - PP/316SS fittings, EPDM gaskets
- Sodium Bisulfate - PVC/PP fittings, EPDM gaskets
- Sodium Bisulfite - PVC/PP fittings, EPDM gaskets
- Sodium Carbonate (30%) - PVC fittings, EPDM gaskets
- Sodium Hypochlorite (<16.5%) - PVC fittings, Viton gaskets
- Sodium Thiosulfate (40%) - PVC fittings, EPDM gaskets
- Sulfuric Acid (98%) - CPVC fittings, Viton gaskets
- Urea Solution (50%) - PP/PVC fittings, EPDM gaskets
- Zinc Orthophosphate - PP/316SS fittings, EPDM gaskets
- Ozonated Water (up to 10 PPM) - PVC fittings, EPDM gaskets
The full, regularly updated list lives in our Chemical Compatibility Database.
The mistake to avoid
The most common error on a double-wall chemical tank is matching the tank resin to your chemical but ignoring the gasket. Sodium hypochlorite, hydrogen peroxide, hydrofluoric acid, phosphoric acid, and 98% sulfuric (on CPVC fittings) all call for Viton rather than the EPDM used on most salts - run EPDM on an oxidizer and the gasket degrades long before the polyethylene does. Two harder exceptions are easy to mis-spec: peracetic acid needs 316SS fittings with Aflas gaskets, and DEF needs 316SS fittings even though it still runs EPDM. The other trap is freeboard - the 1.9 SG rating gives you the weight headroom, but ASTM D1998 expansion and thermal sizing still govern how much usable volume you actually get. Our Captor double-wall freeboard sizing guide and the vapor-headspace wall-thickness analysis walk through both. For containment compliance, see our SPCC 40 CFR 112 walkthrough, and for monitoring fill levels, the tank level gauge selection guide.
This SKU is fulfilled and ships LTL freight from the Lincoln, NE plant, with cost quoted live to your ZIP - use our Freight Cost Estimator for a freight estimate. Or call 866-418-1777 with your chemical and concentration and we will confirm the fitting package (PVC, CPVC, PP, or 316SS) and gasket (EPDM, Viton, or Aflas) against the OEM chart before you buy.
