The Snyder Industries 4000 Gallon ASTM Black Double Wall Tank (SKU 5610000N51) is a 4000-gallon double wall tank molded in high density linear polyethylene with a 1.9 specific gravity rating. It stands 178 inches tall on a 102 x 102 inch square footprint, giving you full containment in a compact ground area. The black exterior resists UV, and the interstitial tank-in-a-tank construction provides built-in secondary containment, so if the primary wall is ever compromised the outer wall holds the contents. Rated to 1.9 SG, it carries a large safety margin on water (1.0) and is qualified for heavier, denser contents up to a 1.9 specific gravity without derating.
Will it work for your site?
Confirm three things before you commit: vertical clearance, footprint, and the loaded weight your pad has to carry. At 178 inches of height you need overhead room for the tank plus fill access, and the 102 x 102 inch footprint has to sit on a level, fully supported base. Filled with water this black double wall tank carries roughly 33,360 lb of contents; at its full 1.9 SG rating it can hold up to about 63,384 lb, so pad engineering matters. Use the Tank Sizing Calculator and the Tank Sizing Guide to match capacity to your draw and refill cycle.
Fittings and access
Per the technical drawing on this page, this tank is configured with a bolt-on flange, an 18-inch PE threaded and vented fitting, and a manway with 15-inch access for interior inspection and cleanout of the primary tank. The 18-inch fitting is vented, which relieves pressure and vacuum during rapid fill and draw-down so the wall is not stressed. Confirm your bulkhead, gasket, and thread pitch match your plumbing before install; the flange and 15-inch manway are your primary points for gasketed connections and interior service. Review the drawing for exact fitting placement and orientation before you plumb the site, and call 866-418-1777 if you need help confirming a connection matches your existing lines.
Freight and ordering
This double wall tank ships LTL from Snyder's plant in Lincoln, NE, with freight quoted live to your ZIP - use the Freight Cost Estimator or call 866-418-1777. A tank this size and weight requires accessorial planning (liftgate, limited access, jobsite delivery), so account for that in your schedule. For sizing discipline on double-wall freeboard and usable volume, read our guide on Snyder Captor double-wall freeboard sizing per ASTM D1998, and for why tall tank walls fail first at the headspace, see HDPE tank wall thickness at the vapor-saturated headspace. If you are specifying for fire-water storage, our fire-water reservoir design guide covers NFPA 22 sizing and cold-climate freeze protection.
