The Snyder Industries 6500 Gallon ASTM Black Double Wall Tank (SKU 5670000N51) is a containment-ready reservoir molded in high density linear polyethylene with a 1.9 specific gravity rating, giving you real margin for dense contents in a double wall configuration. At 6,500 gallons it stands 199 inches (16.6 feet) tall on a 120 x 120 inch footprint - a 10-foot square pad - and the outer wall provides secondary containment without a separate lined berm. Filled with water it carries roughly 54,210 pounds; the wall is rated to hold contents weighing up to 102,999 pounds at its 1.9 SG ceiling. Use those two numbers together when you plan your slab and setbacks.
Will it work for your site?
This black double wall tank turns the exterior wall into built-in secondary containment, useful where a single-wall tank would otherwise need a lined berm - and it's the reason to read up on interstitial-space integrity before you buy; our cathodic disbondment testing guide covers how those spaces are validated. The molded-in fittings shown on the technical drawing on this page include a flange, an 18" PE threaded/vented opening, and a manway with 15" access for interior inspection and service. The black resin blocks light to limit algae growth in stored water. Because the wall is engineered to ASTM D1998, confirm your usable volume against the freeboard the standard requires rather than assuming the full 6,500-gallon nameplate; our Snyder Captor double-wall freeboard sizing guide walks through that math. To match this size against your demand, run the Tank Sizing Calculator or read the Tank Sizing Guide.
The mistake to avoid
The 1.9 specific gravity rating is a ceiling, not a target - it means the wall can safely hold contents up to 1.9 times the density of water, which is why the rated contents weight reaches 102,999 pounds. For water service at roughly 1.0 SG the wall runs with a large margin, a genuine advantage for a long-life reservoir; the real error is undersizing the foundation, since a 10-foot square pad has to carry that full load without settling. If this is a fire-water reservoir or other cold-climate standby application, plan freeze protection into the design; our fire-water reservoir design guide covers NFPA 22 sizing and freeze engineering. It's also worth knowing where double-wall tanks actually fail - the vapor-saturated headspace wall-thickness guide explains why inspecting only the liquid side misses early problems.
Freight and ordering
This tank ships LTL from Snyder's plant in Lincoln, NE, with freight quoted live to your ZIP - a 6500 gallon black double wall tank this size moves as a dedicated flatbed or oversize load, so get an accurate number before you commit. Enter your ZIP in the Freight Cost Estimator or call 866-418-1777 to lock in delivery and confirm offload access for a 199-inch-tall unit, including overhead clearance at the pad. We can also match the flange, 18" PE threaded/vented fitting, and manway - along with the right gaskets - to your plumbing before the tank leaves Nebraska.
