The Snyder Industries 550 Gallon Sulfuric Acid Captor Double Wall Tank (SKU 5040000N30) is a tank-within-a-tank containment vessel: an inner storage tank nested inside an outer wall that captures the full inner volume if the primary ever leaks. It is molded from HDLPE #880046 in opaque white, stands 65 inches tall on a 76 x 76 inch square footprint, and carries a 1.9 specific gravity rating, so it is built for dense, aggressive contents rather than plain water.
Will this double wall tank work for your install?
The 1.9 specific gravity rating is the number that matters here. It means the walls are engineered to hold liquids up to 1.9 times the density of water, which is why Snyder pairs this shell with sulfuric acid service. Filled with water the tank weighs about 4,587 lb; at its maximum rated contents it is designed for roughly 8,715 lb, so plan your pad and anchoring around the heavier figure, not the water figure. Size that foundation for the loaded weight using the ACI 360R-10 concrete pad-sizing framework, and run your fill line and freeboard through our Tank Sizing Calculator and Tank Sizing Guide before you order. For the integrated secondary containment role this cap tank plays under a spill plan, the Snyder Captor SPCC 40 CFR 112 walkthrough and the Captor freeboard sizing guide per ASTM D1998 cover the density, thermal-expansion, and usable-volume math directly.
Fittings and access
Per the technical drawing on this page, the tank carries a flange fitting, an 18-inch PE threaded and vented opening, and a manway with 15-inch access for inspecting and maintaining the inner tank. Those openings sit on top of the 65-inch shell, so leave overhead clearance above the tank for filling and for pulling the manway cover during inspection. Confirm placement against the drawing when you lay out your fill and vent runs.
The mistake to avoid
Do not spec this by capacity alone. A double wall tank rated to 1.9 SG is a deliberate choice for heavy or corrosive liquids, and pairing it with the wrong fitting or gasket material is the common miss. The gasket and fitting elastomers must be rated for your specific acid concentration and temperature. Before the tank ships, call 866-418-1777 to confirm every wetted material against your contents, and size the pad for the loaded weight, not the empty shell.
This double wall tank ships LTL freight, quoted live to your ZIP; the destination determines which Snyder plant serves your order. Get a freight quote with our Freight Cost Estimator or call 866-418-1777 to talk through your double wall containment project before you buy.
