The Snyder Industries 8700 Gallon ASTM Black Double Wall Tank (SKU 1006400N51) is a large-volume double wall tank built for water and other demanding liquid storage where secondary containment matters. It holds 8,700 gallons in a black high density linear polyethylene shell with an integrated outer containment wall, standing 197 inches tall on a 142 x 142 inch square footprint. The tank carries a 1.9 specific gravity rating, meaning the polyethylene is engineered to hold liquids well heavier than water without compromising the wall.
Will this tank work for your site
Start with the load numbers. Filled with water this double wall tank weighs about 72,558 pounds, and the wall is rated to carry contents up to 137,860 pounds at its 1.9 specific gravity ceiling. Use both figures for pad engineering: confirm your foundation is designed for the fully loaded weight before you set it, and plan the 142 x 142 inch footprint into your containment area. The double wall design nests the primary tank inside an outer wall, so a primary breach is caught rather than released to the ground. Factory fittings on this unit include a flange, an 18 inch threaded and vented opening, and a manway with 15 inch access for interior entry and inspection. Match your inlet, vent, and outlet hardware to those exact interfaces (flange bolt pattern, the 18 inch threaded vent connection, and the 15 inch manway access) using the placements and elevations shown on the technical drawing on this page. Also plan for the 197 inch height plus overhead clearance so crews can reach the top fittings and open the 15 inch manway during install and service. For help matching gallonage to your draw and refill cycle, run the Tank Sizing Calculator or read the Tank Sizing Guide.
Freeboard and the mistake to avoid
The most common error on a double wall tank this size is treating the nameplate 8,700 gallons as usable volume and ignoring freeboard. ASTM D1998 sizing accounts for thermal expansion and the density of what you actually store, and on a tall vertical wall that headspace is not optional. Remember that the 1.9 specific gravity figure is a wall-strength ceiling, not a chemical-compatibility clearance, so confirm your specific liquid's density falls under 1.9 before you commit. Our guide on Snyder Captor double-wall freeboard sizing per ASTM D1998 walks through the real volume you can actually use, and the piece on HDPE wall thickness at the vapor-saturated headspace explains why premature failures start above the liquid line where routine liquid-side inspection misses them.
Fire-water and containment service
At 8,700 gallons with secondary containment built in, this black tank suits rural and remote fire-water reservoir duty and other applications where a spill has to be contained. For the design discipline behind that role, see fire-water reservoir tank design for rural and remote sites, and if you are burying a steel outer wall or evaluating interstitial coating integrity, the cathodic disbondment testing methodology covers ASTM G8, G42, and G80.
This black double wall tank ships LTL freight from the Snyder plant in Lincoln, Nebraska, with the rate quoted live to your ZIP code. Get your number with the Freight Cost Estimator or call 866-418-1777 to lock in your tank and coordinate delivery.
