Snyder Industries 4500 Gallon HDLPE Vertical Double Wall Liquid Chemical Storage Tank (1.9 SG)

The Snyder Industries 4500 Gallon HDLPE Vertical Double Wall Liquid Chemical Storage Tank is a Captor-style containment vessel built for chemical service where a secondary barrier is not optional. The primary tank and integral outer wall are molded from high density linear polyethylene (HDLPE) in white, carrying a 1.9 specific gravity rating - the heaviest-duty standard rating Snyder offers in this vertical double wall line, so no step-up tank is needed even for process chemistry well denser than water. It stands 197 inches tall on a 102 x 102 inch footprint, so plan your pad, anchoring, and overhead clearance around a tank just over 16 feet to the top fitting.

Will it work for your application?

The 1.9 SG rating is the number that matters on this double wall tank. Filled with plain water (SG 1.0) the contents weigh roughly 37,530 lb; loaded to its maximum rated density the tank is engineered for contents up to about 71,307 lb - which is the same 4500 gallons of a fluid 1.9 times the density of water. Run the math against your own chemistry: a fluid at 1.4 SG lands near 52,500 lb, comfortably inside the rating; a fluid heavier than 1.9 SG overloads the wall even when the tank "looks" full. Confirming your chemical's specific gravity against the 1.9 rating before you fill is the single most common mistake to avoid on a chemical tank. Note too that 4500 gallons is the primary nameplate volume - your actual fillable volume is lower once freeboard for thermal expansion and overfill is accounted for, so size usable capacity with the freeboard guide below and the Tank Sizing Calculator and Tank Sizing Guide.

Chemical compatibility

This is an HDLPE tank rated to 1.9 specific gravity. The chemicals below are storable in this resin at the concentrations shown, each with the fitting and gasket material it requires - match the fitting AND gasket to the chemical, not just to the tank, because a Viton gasket where the chart calls for EPDM, or PVC where it calls for 316SS or CPVC, is the failure point that takes out an otherwise sound install. Always verify against the manufacturer's chemical-resistance chart, which is concentration- and temperature-specific, before committing to a service.

Watch the non-standard pairings: DEF and Peracetic Acid call for 316SS metal fittings, Sulfuric Acid at 98% wants CPVC rather than PVC, and the Viton-gasket services - Hydrochloric, Hydrofluoric, Hydrofluosilicic, Hydrogen Peroxide, Phosphoric, Sulfuric, and Sodium Hypochlorite - will chew through an EPDM seal. Those rows are where chemical installs most often go wrong. Full data lives in our Chemical Compatibility Database.

Engineering the containment correctly

A double wall tank is only as good as the freeboard and overfill protection around it. Size the usable volume with thermal expansion and chemistry density in mind per our Captor freeboard sizing guide, plan SPCC documentation with the 40 CFR 112 compliance walkthrough, and design layered safeguards using the spillover redundancy and high-level-alarm guide. For instrumentation, our level gauge selection guide walks radar vs ultrasonic vs hydrostatic vs magnetostrictive for chemical service. For the exact fitting and manway layout on this vertical storage tank, request the configuration drawing by phone.

This Snyder vertical double wall tank ships LTL from the Snyder plant in Lincoln, Nebraska, with freight quoted live to your ZIP - get your number from our Freight Cost Estimator or call 866-418-1777. At 197 inches tall and over 16 feet on delivery, confirm site access and unloading equipment before the truck arrives; a tank this size needs the right crane or forklift on the receiving end. Questions on fittings, double wall configuration, or matching this vessel to your chemistry - call and we will spec it with you.