The Snyder Industries 405 Gallon HDLPE Vertical Double Wall Storage Tank is a containment-grade vertical built for dense, aggressive chemical service, carrying a 1.9 specific gravity resin rating that puts it at the highest SG-rated end of the plastic-tank range in this footprint. This is Snyder's high-SG containment resin, selected for heavy chemical duty, which is why the wall is rated to 1.9 SG rather than the 1.5 typical of a standard chemical vertical. The 405-gallon primary vessel sits inside a secondary containment wall, so a primary breach is captured rather than spilled. It stands 73 inches tall on a 48 x 48 inch footprint in white High Density Linear Polyethylene, engineered for a maximum rated contents weight of 6,418 pounds.
Will it work for your application
Filled with plain water, this vertical storage tank carries roughly 3,378 pounds of contents at full volume. The 1.9 specific gravity rating means the wall is built for liquids up to 1.9 times the density of water, which is why the maximum rated contents weight climbs to 6,418 pounds for a heavier fill. In practice that headroom lets you fill all 405 gallons of any fluid up to 1.9 SG and stay inside rated weight, so confirm your fluid's specific gravity against that 1.9 ceiling before you size it. Use the Tank Sizing Calculator and Tank Sizing Guide to match working volume and freeboard to your duty cycle. Because this is a double wall design, size the contained chemical to the primary vessel, not the outer containment shell.
Dimensions, fittings and access
At 73 inches tall on a 48 x 48 inch footprint, check door, ceiling, and curb clearance plus pad size against those numbers before delivery. Per the technical drawing on this page, this double wall tank is configured with an 18-inch PE threaded and vented lid and a manway with 15-inch access for entry, inspection, and cleanout. The two elastomer points to verify against your chemical are the manway gasket and the 18-inch lid seal, since those wetted, non-polyethylene surfaces are the real-world failure point on a containment tank. Match those seals, plus any inlet, outlet, or vent hardware, to your stored fluid. See the technical drawing on this page for fitting locations and orientation before you plumb the install.
The mistake to avoid
The single biggest error on a double-wall containment tank is treating specific gravity as a formality. This vessel is rated to 1.9 SG, and undersizing against the actual density of your stored chemical is how a plastic tank gets overloaded. For Snyder Captor double-wall freeboard discipline, work through our guide on Captor freeboard sizing per ASTM D1998; for spill-containment regulatory work, see Captor tanks for SPCC 40 CFR 112 compliance; and if this is going on a pad, the concrete pad sizing framework covers foundation work for a tank this heavy. Rural fire-water buyers can also reference our fire-water reservoir design guide.
This double wall tank ships LTL freight from the Snyder plant in Chowchilla, California, with freight quoted live to your ZIP. Get your rate with the Freight Cost Estimator, or call 866-418-1777 to confirm fittings, lead time, and freight before you order.
