The Snyder Industries 12500 Gallon Sodium Hypochlorite (UV) Double Wall Tank (SKU 1031100N52) is a Snyder double wall tank molded in Opaque White HDLPE #880059 and rated to a 1.9 specific gravity. That 1.9 rating is the number that matters most here: it is what lets the primary tank safely hold a dense fluid like sodium hypochlorite rather than plain water. At 274 inches tall on a 142 x 142 inch footprint, this is a large-format containment tank, and its double wall construction provides secondary containment around the primary vessel.
Will it work for your application
Filled with water, the tank carries roughly 104,250 lb; loaded to its maximum rated contents at the 1.9 specific gravity, it can reach about 198,075 lb. Plan the pad and structural support for the loaded figure that matches your actual fluid density, not the water number. Use the Tank Sizing Calculator and the Tank Sizing Guide to confirm the 12,500 gallons line up with your draw rate and required freeboard, and reserve the full 142 x 142 inch footprint on the slab.
Fittings and access
The technical drawing on this page shows the fitting layout for this specific tank: a flange, an 18-inch PE threaded/vented fitting, and a manway with 15-inch access. The vented fitting matters for sodium hypochlorite service, which off-gasses, so plan the vent path deliberately rather than treating it as a spare port. Because the flange is a gasketed connection, confirm the gasket and any bolt or hardware material are rated for your sodium hypochlorite concentration alongside the tank resin. Confirm every fitting location and thread size against the drawing before you set piping, and verify the tank resin and 1.9 SG rating suit your exact concentration and temperature against the manufacturer's chemical-resistance chart before committing.
Sizing and design guidance
Because this is a double wall unit, freeboard and thermal-expansion planning are not optional. Our guide on Snyder Captor double-wall freeboard sizing per ASTM D1998 walks through the real usable volume once density and expansion are accounted for. If this tank supports a containment or spill program, review the SPCC 40 CFR 112 walkthrough, and for the pad itself, the concrete pad sizing framework.
This white double wall tank ships LTL from the Snyder plant in Lincoln, NE. Freight is quoted live to your ZIP, so get your freight rate with the Freight Cost Estimator or call us at 866-418-1777 to confirm fittings, lead time, and delivery access before you order.
