The Snyder Industries 4500 Gallon HDPE Vertical Double Wall Liquid Chemical Storage Tank in White is a containment-rated vertical storage tank engineered for chemical service where a secondary wall is a code or insurance requirement. It holds 4,500 gallons, stands 197 inches tall on a 102.0 x 102.0 inch footprint, and is molded from high density linear polyethylene with a 1.9 specific gravity rating - meaning it is built to hold dense chemicals, not just water. As a double wall tank, it combines a primary tank inside an outer containment shell, which is why operators searching for an hdpe double wall vertical storage tank land on this size for tank farms, water treatment buildings, and chemical feed rooms.
Will it work for your installation?
Start with the weight math, because that is where double wall vertical tanks surprise people. Filled with water for a hydrostatic test, this tank carries roughly 37,530 lb. At its full 1.9 specific gravity rating, the contents alone can reach about 71,307 lb. Your pad, anchoring, and floor loading have to be designed for the heaviest fluid you will actually store, not for water. Confirm the slab and any seismic or wind anchoring against those figures before you commit. At 197 inches tall, also verify door, ceiling, and rigging clearance for both delivery and future maintenance access, and see the technical drawing on this page for the outer-shell dimensions. Use the Tank Sizing Calculator and the Tank Sizing Guide to match capacity and footprint to your room and turnover rate.
Chemical compatibility
This tank is molded in high density linear polyethylene (HDLPE) and carries a 1.9 specific gravity rating, which is what lets it hold the dense acids and salt solutions below. Every chemical listed here falls within that 1.9 SG rating, so you are not buying at the margin of the tank's density limit - 1.9 is the rated ceiling for this model, and no chemical below requires more. The tank shell handling a chemical is only half the system, though: the fittings and gaskets in contact with that chemical have to match it too. Note the split - salt solutions and bases run on PVC fittings with EPDM gaskets, while oxidizers and strong acids (hypochlorite, peroxide, sulfuric, hydrofluoric) call for Viton or Aflas gaskets and CPVC fittings. A few entries - DEF, peracetic acid, propylene glycol, zinc orthophosphate - call for 316 stainless fittings, not PVC, so don't default to plastic hardware. Always verify against the OEM chemical-resistance chart for your exact concentration and temperature, since polyethylene compatibility shifts with both. Representative chemicals this resin and SG rating support, with the wetted materials they call for:
- 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 Chemical Compatibility Database covers concentration and temperature specifics for each of these.
The mistake to avoid on a double wall chemical tank
The most common error is treating the secondary containment as a free pass on freeboard and chemistry. The interstitial space buys you spill capture, not extra working volume - size your fill level for thermal expansion and headspace, not the nameplate gallons. For sodium hypochlorite specifically, note the <16.5% concentration ceiling above, and remember that off-gassing concentrates in the vapor-saturated headspace where wall stress is highest; our guide on HDPE tank wall thickness at the vapor-saturated headspace explains why liquid-side inspection misses those failures. For SPCC-driven installs, the Snyder Captor double-wall tanks for SPCC 40 CFR 112 walkthrough and the freeboard sizing per ASTM D1998 guide walk through usable volume, and the tank level gauge selection guide covers monitoring both the primary and interstitial spaces.
This tank ships LTL freight from the Snyder plant in Lincoln, Nebraska, with the rate quoted live to your ZIP. A tank this size and weight typically moves as a dedicated LTL or flatbed delivery, so get a real number before budgeting - use the Freight Cost Estimator for your ZIP or call 866-418-1777 to talk through rigging and offload. List price shown is before freight.
