The Snyder Industries 3000 Gallon Sulfuric Acid Captor Double Wall Tank (SKU 5590000N30) is a secondary-contained storage tank built for aggressive chemical duty: an integral outer wall captures the full volume of the primary tank if the primary is ever compromised. It is molded in HDLPE (resin #880046) in Opaque White, stands 142 inches tall on a 102 x 102 inch square footprint, and carries a 1.9 specific gravity rating — the number that tells you what density of liquid the walls are engineered to hold. This is a double wall tank for sulfuric acid service, and the SG rating is the reason it exists.
Will it hold your chemical
The 1.9 specific gravity rating is the headline spec. Concentrated sulfuric acid is far heavier than water — roughly 1.84 times the density — so a standard 1.5 SG polyethylene tank is under-rated for it on density alone. This Captor is rated to 1.9 SG, which brings a dense chemical like sulfuric acid within its density design envelope. At 3000 gallons the primary tank holds about 25,020 pounds of plain water when full; rated to its maximum contents, the structure is engineered for up to 47,538 pounds of liquid weight. The specific gravity rating covers density loading, not chemical resistance — confirm your acid's actual concentration and density against that 1.9 ceiling before you order, and match your gaskets, fittings, and vent hardware to your specific sulfuric-acid service, since the tank shell is only one part of a compliant system. If you are working through freeboard, thermal expansion, and the real usable volume on a Captor double-wall, our guide on Captor freeboard sizing per ASTM D1998 walks the calculation, and the Tank Sizing Calculator and Tank Sizing Guide help you fit the footprint and height to your pad and containment area.
The double-wall advantage for compliance
The Captor's built-in outer containment wall is what makes it a fit for sites operating under SPCC rules, where secondary containment for oil and chemical storage is not optional. Instead of pouring a separate concrete dike, the tank brings its own containment volume. Our walkthrough on Captor double-wall tanks for SPCC 40 CFR 112 covers how that factors into a compliance plan. When you set the tank, plan the concrete pad for the loaded weight — a fully rated 47,538-pound tank demands real structural support, which our concrete pad sizing framework addresses. For exact fitting locations, wall configuration, and dimensional detail, see the technical drawing on this page before finalizing your layout.
The mistake to avoid
The costly error on a tank like this is treating specific gravity as a formality. Sizing a 1.5 SG tank for a 1.84 SG acid, or filling a 1.9-rated tank with a liquid heavier than its rating, overstresses the wall and shortens tank life. Buy to the density you are actually storing, and keep the double-wall interstitial space clear for its containment job.
This 3000 gallon double wall tank ships LTL from Snyder's Lincoln, NE plant (Snyder also molds from West Virginia — whichever origin serves your ZIP sets the freight lane), quoted live to your delivery ZIP. Get a number in minutes with the Freight Cost Estimator or call 866-418-1777 to talk through your sulfuric acid install with a specialist.
