The Snyder Industries 12,500-gallon double wall tank is built for bulk water and dense-liquid storage where secondary containment has to be part of the tank itself, not a separate berm. The primary tank is crosslinked linear polyethylene (XLPE) rated to 1.5 specific gravity, standing 274 inches tall on a 142 x 142-inch square footprint. That 1.5 SG rating is the number that matters here: the wall is engineered to hold contents up to 1.5 times the weight of water, so the same tank that stores 12,500 gallons of water can also hold denser solutions without exceeding its structural rating.
Will it work for your site?
Plan your pad and clearances around real dimensions and real loaded weight, not gallons. The tank stands 274 inches tall (H) with a 142 x 142-inch footprint (W and L), so verify overhead and access clearance before it arrives. Filled with water, it carries 104,250 pounds of contents; at its maximum rated 1.5 SG loading it carries 156,375 pounds. Spread across the 142 x 142-inch footprint, that is a heavy, concentrated load, so a properly sized and level concrete pad is not optional. The double wall construction gives you an integral outer containment shell, which is why operators reach for this configuration when a spill would reach soil, groundwater, or a fire-water reserve. If you are still comparing capacities and footprints across your options, run the numbers through our Tank Sizing Calculator and the Tank Sizing Guide before you commit.
Fittings and access
The tank is configured with a flange, an 18-inch PE threaded and vented fitting, and a manway with 15-inch access for entry and inspection. Exact fitting locations, elevations, and orientations are shown on the technical drawing on this page - confirm those against your plumbing and any existing tie-ins before ordering, because on a tank this size relocating a fitting after the fact is not practical. This is the XLPE double wall that search shoppers know as the "black double wall tank" from Snyder, and the black pigment provides UV protection and light blockout to discourage algae in outdoor water service.
The mistake to avoid
Do not treat the 1.5 SG rating as a chemical-service clearance. XLPE and the 1.5 SG number tell you the tank can carry a heavier-than-water load structurally; they do not by themselves qualify the tank, its gaskets, and its fittings for a specific chemical. For any non-water solution, confirm the flange gasket and the 18-inch PE threaded fitting seal materials against the OEM chemical-resistance chart at your actual concentration and temperature, and match the service to the tank rather than assuming it. For the freeboard and thermal-expansion math behind double wall sizing, our guide on Snyder double-wall freeboard sizing per ASTM D1998 walks through the real usable volume, and the write-up on wall thickness at the vapor-saturated headspace covers where these tanks are most often inspected too late. For fire-water reserve applications, see our fire-water reservoir design guide.
This tank ships LTL from Snyder's plant in Lincoln, NE, and freight is quoted live to your ZIP - get a number from our Freight Cost Estimator or call 866-418-1777. At 156,375 pounds of maximum rated contents over a 142 x 142-inch pad, confirm your delivery site can accept and offload a large LTL shipment before you order, and our team can help you plan the drop.
