The Snyder Industries 5000 Gallon Double Wall Tank (SII-5630000N30) is a containment tank rated to 1.9 specific gravity, molded in white high-density linear polyethylene. The inner tank holds 5,000 gallons and sits inside an integral outer wall, so a leak in the primary is caught by the secondary rather than reaching your pad or the ground around it. It stands 216 inches tall on a 102 by 102 inch footprint, and the 1.9 s.g. rating means the wall is engineered to carry a dense-liquid load that a standard water-rated tank cannot.
Will it work for your site
Size the tank to the contents, not just the volume. Filled with water this double wall tank weighs about 41,700 lbs, and it is rated to carry up to 79,230 lbs of contents at its full 1.9 specific gravity. That spread tells you the shell is built for roughly 1.9 times water density, so any product between 1.0 and 1.9 s.g. is inside the envelope. It also sets the ceiling: 1.9 is the top structural rating here, not a mid-tier step, so a liquid heavier than 1.9 s.g. needs a different tank entirely. Confirm your product's specific gravity before you commit, and run the numbers through our Tank Sizing Calculator and Tank Sizing Guide.
Pad, rigging, and containment role
Because this is a double wall design, it plays a defined part in a secondary-containment stack rather than a plain storage role. Our walkthrough on Snyder Captor double-wall tanks for SPCC 40 CFR 112 compliance covers where that containment fits the regulation, and the freeboard sizing guide per ASTM D1998 explains how density and thermal expansion cut into the volume you can actually use. Size the pad and your rigging plan to the loaded 79,230 lb worst case on the 102 by 102 inch footprint, not the lighter water figure - our concrete pad sizing framework lays out the foundation math for a load this heavy.
The mistake to avoid
The costliest error on a 1.9 s.g. double wall tank is treating the rating as a suggestion. The 79,230 lb contents ceiling is a hard limit tied to that specific gravity - overfilling with a denser product, or ignoring the reduced usable volume once you account for freeboard, is where these tanks get into trouble. Bulkhead fitting and gasket materials are not carried in this record, so confirm the fitting and elastomer selection against your chemistry by phone before ordering. Verify your liquid's specific gravity, set your fill accordingly, and match the fittings to the service.
This double wall tank ships LTL freight from the Snyder plant in Lincoln, NE, quoted live to your ZIP. Get a real number with our Freight Cost Estimator, or call 866-418-1777 and we will size the tank, confirm the specific gravity match, and quote freight to your delivery address.
