The Snyder Industries 5500 Gallon Vertical Double Wall Liquid Chemical Storage Tank is built for full-containment chemical storage where a leak is not an option. It is rotationally molded from high density linear polyethylene (HDLPE) in white, rated to 1.9 specific gravity, and stands 172 inches tall on a 120 x 120 inch footprint. The integrated outer wall acts as built-in secondary containment, the configuration engineers reach for on SPCC sites and anywhere a containment berm would otherwise be required. This is a serious vertical storage tank, and the three questions that decide the purchase are: will it hold your chemical, how does it ship, and what is the one mistake that ruins the install.
Will it work for your chemical and your site
The 1.9 SG rating is the number that matters here. It means the tank wall is engineered to carry contents up to 1.9 times the weight of water, so dense acids and concentrated solutions are within its design envelope rather than at the edge of it. Filled with plain water this tank carries roughly 45,870 lb; at its maximum rated contents weight it is engineered for approximately 87,153 lb. Spread across the 120 x 120 inch footprint, that maximum load works out to roughly 6 lb per square inch of average bearing pressure, a number you can hand to whoever sizes the pad and ring-wall. That load is real and it does not forgive a soft sub-base. This tank ships LTL freight from the Snyder plant in Lincoln, Nebraska, quoted live to your ZIP. Use the Tank Sizing Calculator and the Tank Sizing Guide to confirm 5,500 gallons of usable volume fits your turnover and freeboard needs before you commit the footprint.
The technical drawing on this page is the authority on fitting layout. Per the drawing this tank is configured with a flange, an 18-inch PE threaded, vented fitting or lid, and a manway with 15-inch access for inspection, gauging, and service. Defer to the drawing for whether that 18-inch threaded, vented item is the vented lid itself or a separate port, and do not assume it is an 18-inch pipe nozzle. That vented connection is not optional trim on a double-wall chemical tank; venting has to keep pace with your fastest fill and draw rate, and the manway access governs how you inspect the interior over the tank's life. Confirm the as-built fitting schedule against the drawing before you order valves and piping.
Chemical compatibility
This is an HDLPE tank rated to 1.9 specific gravity. Compatibility below is built from the manufacturer's chemical-resistance chart, which is concentration- and temperature-specific, so verify your exact chemistry, concentration, and operating temperature against that chart and the dedicated Chemical Compatibility Database page for each chemical before you store anything.
Chemicals this HDLPE tank is suited to, with the fitting and gasket materials called out by the chart, include: acetic acid (60%, PP/PVC fittings, EPDM gaskets), aluminum sulfate (50%, PVC, EPDM), calcium chloride (40%, PVC, EPDM), DEF (32.5%, 316SS, EPDM), ethylene glycol (100%, PVC, EPDM), ferric chloride (50%, PVC, EPDM), ferric sulfate (60%, PVC, EPDM), ferrous sulfate (20%, PVC, EPDM), hydrochloric acid (37%, PVC, Viton), hydrofluoric acid (48%, PP/PVC, Viton), hydrofluosilicic acid (26%, PP/PVC, Viton), hydrogen peroxide (50%, PVC, Viton), magnesium chloride (30%, PVC, EPDM), peracetic acid (30%, 316SS, Aflas), phosphoric acid (85%, PVC, Viton), polyaluminum chloride (PVC, EPDM), potassium carbonate (50%, PVC, EPDM), potassium hydroxide (saturated, PVC, EPDM), propylene glycol (PP/316SS, EPDM), sodium bisulfate (PVC/PP, EPDM), sodium bisulfite (PVC/PP, EPDM), sodium carbonate (30%, PVC, EPDM), sodium hypochlorite (under 16.5%, PVC, Viton), sodium thiosulfate (40%, PVC, EPDM), sulfuric acid (98%, CPVC, Viton), urea solution (50%, PP/PVC, EPDM), zinc orthophosphate (PP/316SS, EPDM), and ozonated water (up to 10 PPM, PVC, EPDM). Notice the gasket calls vary by chemical: sodium hypochlorite, hydrogen peroxide, the acids, and peracetic acid drive you to Viton or Aflas rather than EPDM, and several services specify 316SS or CPVC wetted parts instead of PVC. Match every wetted component, not just the tank.
The mistake to avoid
The single most common way buyers get a chemical tank wrong is treating the 1.9 SG rating and the resin as interchangeable across every chemical, and bolting standard EPDM-gasketed PVC fittings onto everything. They are not interchangeable. Sodium hypochlorite, hydrogen peroxide, the strong acids, and peracetic acid each demand specific gasket and fitting materials called out above, and storing a chemical hotter or more concentrated than the chart assumes can move it out of the compatible range entirely. For double-wall containment specifically, read our walkthroughs on SPCC 40 CFR 112 compliance and freeboard sizing per ASTM D1998, plan your high-level alarm and overfill architecture, and choose instrumentation with our level gauge selection guide.
This tank ships LTL freight from the Snyder plant in Lincoln, Nebraska, on a dedicated truck given its size and weight, with cost quoted live to your ZIP code. Get your number with our Freight Cost Estimator or call 866-418-1777 to lock in delivery, confirm the fitting schedule against the technical drawing, and verify chemical compatibility for your exact service before you order.
