The Snyder Industries 5500 Gallon HDLPE Double Wall Tank is a self-contained primary-and-secondary storage vessel for high-value liquids where a spill cannot be allowed to reach the ground. Built from high-density linear polyethylene with a 1.9 specific gravity rating, the inner tank sits inside an integral outer containment shell, so you get built-in secondary containment without pouring a separate concrete dike. This white, opaque double wall tank stands 172 inches tall on a 120 x 120 inch footprint, and the opaque wall blocks light from the stored contents — a real advantage for liquids that degrade under UV.
Will it work for your site?
This Snyder double wall tank measures 172 in high by 120 in wide by 120 in long, so plan for both the 10-foot square footprint and the overhead clearance before you set a pad location. Filled with water it carries about 45,870 lb; the shell is rated to a maximum contents weight of 87,153 lb, which is simply that full-water figure scaled by the 1.9 SG rating (87,153 ÷ 45,870 ≈ 1.9). That means the 1.9 rating is the ceiling here, and any liquid lighter than 1.9 SG sits comfortably inside spec — no derating needed. That mass makes the slab the critical detail: size a level, engineered pad under the full 120 x 120 footprint using our concrete pad sizing guide. To set usable gallons and freeboard on the inner tank, see the Snyder double-wall freeboard write-up, and match capacity to draw-down with our Tank Sizing Calculator and Tank Sizing Guide.
Fittings, venting, and compatibility
Per the technical drawing on this page, this wall tank is configured with a flange fitting, an 18-inch PE threaded and vented top opening, and a manway with 15-inch access for interior entry, cleaning, and inspection. The vented opening is safety-critical: verify its capacity against your fill rate and any offgassing on the drawing before you plumb the tank. Confirm exact fitting locations, elevations, and thread sizes against the drawing as well. Because the 1.9 SG rating supports liquids heavier than water, confirm that the tank resin and the flange gasket, vent, and manway seal materials are all rated for your specific stored liquid before you fill — the gaskets and seals are the real chemical-contact points, not just the polyethylene wall.
This 5500-gallon white double wall tank ships LTL freight from the Snyder plant in Lincoln, Nebraska, quoted live to your ZIP — get a number in seconds with our Freight Cost Estimator or call 866-418-1777 to lock delivery and offloading. Tell us your ZIP and we will route it from Nebraska on the most cost-effective carrier.
