The Snyder Industries 5500 Gallon ASTM Black Double Wall Tank (SKU 5660000N49) is a large-volume polyethylene black double wall tank built for bulk water storage where secondary containment matters. It holds 5,500 gallons, stands 172 inches tall on a 120 x 120 inch footprint, and carries a 1.5 specific gravity rating. The black wall blocks light to slow algae growth, a practical advantage for outdoor water storage, and the double wall construction puts an outer containment shell around the primary tank.
Will it work for your site?
Start with weight, because that governs the pad and the ground under it. Filled with water, expect roughly 45,870 lb of contents; loaded to the full 1.5 SG rating, the tank can carry up to 68,805 lb. That 1.5 SG rating is the ceiling feature here: it accepts denser rated liquids that a standard 1.0 or 1.35 SG water tank cannot, so sizing this unit for water leaves headroom you would give up by downsizing. Those weights dictate a properly engineered, level foundation — a reinforced concrete pad sized for the 120 x 120 inch footprint is the norm at this scale. Use the Tank Sizing Calculator and Tank Sizing Guide to confirm capacity and pad requirements before you order, and plan usable volume below the 5,500-gallon nominal once you account for freeboard.
Fittings and tie-ins
The drawing shows three connection points: a flange for bolt-up plumbing, an 18-inch PE threaded/vented fitting for fill and venting, and a manway with 15-inch access for inspection. See the technical drawing on this page for exact fitting locations before you plan your tie-ins. Bolt-through flange connections need field-supplied gaskets sized to the flange, so verify gasket material against your stored liquid before assembly. On a double wall tank of this scale, freeboard and thermal expansion are real design inputs — our guide on Snyder Captor double-wall freeboard sizing per ASTM D1998 walks through the difference between nominal and usable volume so you don't overfill. It's also worth understanding where wall stress concentrates at the vapor-saturated headspace when you set an inspection routine. For cold-climate or rural fire-water duty, the fire-water reservoir design guide covers NFPA 22 sizing and freeze protection.
Freight and next steps
This double wall tank ships LTL from Snyder's plant in Lincoln, Nebraska, with freight quoted live to your ZIP. At 172 inches tall and 120 inches square, it exceeds standard van height and moves as an oversized flatbed load, so plan a forklift or crane rated for the empty-tank offload at your delivery point along with the lead time and access that go with a tank this size. Get a real number with our Freight Cost Estimator or call 866-418-1777 and we'll quote it to your delivery point.
