The Snyder Industries 4000 Gallon ASTM XLPE Black Double Wall Tank (SKU 5610000N48) is a crosslinked polyethylene tank built for high-density liquid storage where secondary containment matters. It holds 4,000 gallons in a black XLPE shell rated to 1.9 specific gravity, standing 178 inches tall on a 102 x 102 inch footprint. The integral outer wall gives you built-in containment without a separate berm, which is why operators searching for a heavy-duty double wall black tank land here.
Will this tank work for your site?
Start with weight and space. Filled with water this tank carries roughly 33,360 pounds of contents, and its 1.9 specific gravity rating means it is engineered to hold up to about 63,384 pounds of denser liquid at full capacity. Spread across the 102 x 102 inch base, that is about 3.2 lb/in² at full water and up to roughly 6.1 lb/in² at max rated density, so bring that number to whoever pours your pad and confirm your structural support before the tank arrives. The 178 inch height plus that footprint set your door and overhead clearance for placement. Run your figures through the Tank Sizing Calculator and the Tank Sizing Guide to match capacity and freeboard to your actual liquid before you commit.
Fittings and access
Per the technical drawing on this page, this tank is configured with a flange fitting, an 18-inch PE threaded and vented fitting, and a manway with 15-inch access. Those three ports are your connection and service points: plumb your inlet and outlet to the flange and the 18-inch vented PE port, and treat the 15-inch manway as your only interior-access and inspection opening. Size your inlet, outlet, and vent hardware to those ports before ordering, because XLPE penetrations should be set once and not reworked. For the mechanics of why double wall freeboard and thermal expansion drive usable volume, the guide on Snyder Captor double-wall freeboard sizing per ASTM D1998 is worth reading before you finalize fittings.
The mistake to avoid
Understand what you are buying: this is crosslinked (XLPE) resin, not standard linear HDPE. The crosslink network is what earns the 1.9 specific gravity rating and the double-wall service listing, and it also means the shell cannot be field-welded or repaired like some linear tanks. At 1.9 SG this is the highest-density-rated configuration in this size class, so it covers water at SG 1.0 with a large margin and handles liquids up to about 1.9 SG and 63,384 pounds. Treat that rating as a ceiling, not a target. Also account for the vapor-saturated headspace where wall stress concentrates over time; the analysis of HDPE wall thickness at the vapor-saturated headspace explains why liquid-side inspection alone misses early problems. If this is fire-water or emergency reserve duty, the fire-water reservoir design guide covers NFPA 22 sizing discipline and cold-climate protection.
This tank ships LTL freight, and depending on stock and your ZIP it may ship from our Nebraska plant in Lincoln, NE or from our West Virginia location, so the live quote reflects the fulfilling plant. Get a freight number in seconds with our Freight Cost Estimator, or call 866-418-1777 and we will quote it by phone. Listed price is before freight.
