The Snyder Industries 5500 Gallon Double Wall Liquid Chemical Storage Tank is built for double-wall chemical service, including dense, aggressive acids such as 98% sulfuric acid, where the cost of a release far exceeds the cost of the tank. This is a Snyder Captor-style double wall tank molded in high density linear polyethylene (HDLPE), white, rated to a specific gravity of 1.9. The integral secondary containment surrounds the primary tank, so the engineered containment travels with the tank rather than relying on a separate berm. It stands 172 inches tall on a 120 x 120 inch footprint, making it a tall, large-volume storage tank for tank farms, water treatment plants, and industrial chemical installations.
Will this tank handle my chemical?
The primary tank is HDLPE rated to a 1.9 specific gravity, which is what lets it hold dense acids that would exceed a standard 1.5 SG water-grade tank. Because the resin family designation reads as HDLPE here, confirm HDLPE versus crosslinked (XLPE) construction with us before you place it into chemical service, since the two resins do not share the same chemical-resistance envelope. Then verify your chemical's specific gravity against the 1.9 rating as a hard pass/fail check: 98% sulfuric acid runs near 1.84 SG, which is precisely why a 1.5 SG tank is disqualified and this 1.9 SG tank is the right call. At 5,500 gallons nominal, plan for the loaded weight: full of water (SG 1.0) the contents alone run about 45,870 lb, and at the maximum rated contents the tank carries roughly 87,153 lb of liquid. Your pad, anchoring, and structural support must be designed for that loaded mass, not the empty shell. Note that 5,500 gallons is nominal, not usable, volume; once you reserve freeboard for thermal expansion you will have less working volume to size your deliveries against. Use the Tank Sizing Calculator, the Tank Sizing Guide, and our Captor freeboard sizing guide to land on the working volume you can actually use.
Chemical compatibility
Compatibility always depends on concentration, temperature, fitting material, and gasket material together, not the resin alone. The following chemicals are compatible at the listed concentrations when paired with the correct fitting and gasket materials, per the OEM chemical-resistance chart, which is concentration- and temperature-specific:
- Sulfuric Acid at 98% with CPVC fittings and Viton gaskets
- Hydrochloric Acid at 37% with PVC fittings and Viton gaskets
- Hydrofluoric Acid at 48% with PP/PVC fittings and Viton gaskets
- Hydrofluosilicic Acid at 26% with PP/PVC fittings and Viton gaskets
- Phosphoric Acid at 85% with PVC fittings and Viton gaskets
- Acetic Acid at 60% with PP/PVC fittings and EPDM gaskets
- Peracetic Acid at 30% with 316SS fittings and Aflas gaskets
- Hydrogen Peroxide at 50% with PVC fittings and Viton gaskets
- Sodium Hypochlorite at <16.5% with PVC fittings and Viton gaskets
- Ferric Chloride at 50% with PVC fittings and EPDM gaskets
- Ferric Sulfate at 60%, Ferrous Sulfate at 20%, and Aluminum Sulfate at 50%, all with PVC fittings and EPDM gaskets
- Calcium Chloride at 40% and Magnesium Chloride at 30% with PVC fittings and EPDM gaskets
- Sodium Carbonate at 30%, Potassium Carbonate at 50%, and Potassium Hydroxide saturated, with PVC fittings and EPDM gaskets
- Sodium Thiosulfate at 40%, Sodium Bisulfate, and Sodium Bisulfite, with PVC/PP fittings and EPDM gaskets
- Polyaluminum Chloride and Zinc Orthophosphate with PVC or PP/316SS fittings and EPDM gaskets
- DEF at 32.5% and Urea Solution at 50% with 316SS or PP/PVC fittings and EPDM gaskets
- Ethylene Glycol at 100% and Propylene Glycol with PVC or PP/316SS fittings and EPDM gaskets
- Ozonated Water up to 10 PPM with PVC fittings and EPDM gaskets
Match the fitting and gasket to the chemical you are storing, not to a generic default, and verify every selection in our Chemical Compatibility Database.
The mistake to avoid
The most common error on a tank this size is treating the double wall as a license to skip layered safeguards. The integral outer wall provides the engineered secondary containment SPCC buyers need, so the containment can travel with the tank instead of a separate berm; confirm the containment volume satisfies your 40 CFR 112 sizing before you design out the berm. What the double wall does not do is stop an overfill that runs out the top. Engineer your high-level alarm, automatic cutoff, and gauging before loadout, and pick instrumentation rated for the chemical and the fitting materials above. Our guides on tank spillover redundancy engineering and level gauge selection for chemical service walk through the alarm architecture and gauging choices for double wall chemical storage, and our Captor SPCC 40 CFR 112 walkthrough covers the containment sizing in detail. Fittings and bulkhead penetrations are specified per order and must be matched to the chemical per the table above; see the technical drawing on this page for the tank profile.
This double wall tank ships LTL freight from Snyder's plant in Lincoln, Nebraska, given its size and loaded weight class, with freight quoted live to your ZIP code. Get an exact number with our Freight Cost Estimator, or call 866-418-1777 to talk through delivery, offload, and placement for a vessel this large. Listed before freight.
