The Snyder Industries 1500 Gallon ASTM Black Double Wall Tank is a tank-within-a-tank built for bulk liquid storage where a containment failure cannot become a spill. The inner and outer shells are molded from High Density Linear Polyethylene to ASTM standards, with the outer wall acting as integral secondary containment so you skip the separate concrete or steel berm. It holds 1500 gallons nominal, stands 76 inches tall, and sits on a 93 x 93 inch footprint. The black resin blocks light to discourage algae growth in stored water, and the tank carries a 1.9 specific gravity rating, giving it substantial headroom above the 1.0 density of water.
Will this double wall tank work for your site?
Plan your slab around the 93.0 x 93.0 inch footprint and the 76 inch height. Filled with water at 1.0 specific gravity, the tank and contents weigh about 12,510 pounds, so the pad and any structure underneath must be rated accordingly. The 1.9 specific gravity rating means the shell is engineered to carry contents up to a maximum rated weight of 23,769 pounds, which is the structural ceiling for denser liquids rather than a target for water. That rating is also a future-proofing lever: if you ever convert this tank to a heavier liquid down the road, the shell already has the density headroom, though that is a structural rating and never a substitute for confirming chemical compatibility. One sizing note before you commit: the 1500 gallon figure is nominal, and usable volume is less once you reserve freeboard, so size against the working volume rather than the label. Run the numbers through our Tank Sizing Calculator and the Tank Sizing Guide, and for the double wall freeboard and real usable volume question, the Snyder Captor double-wall freeboard sizing guide walks through the ASTM D1998 math. Our wall-thickness at the vapor headspace guide covers where premature failures actually start.
Fittings and the mistake to avoid
Bulkhead and outlet sizes, fill, vent, gasket details, and any interstitial monitoring or access points are not specified in this listing, so confirm fitting layout against the technical drawing on this page or by calling 866-418-1777 before you plumb the tank. The biggest error on a double wall tank this size is treating the outer wall as a free upgrade and ignoring the interstitial space in your inspection routine. The vapor-saturated headspace between liquid fills is where wall stress concentrates, so monitor it the same way you would the wetted shell. The second mistake is reading the 1.9 specific gravity rating as a green light for any liquid. That rating describes how dense a contents this shell can structurally hold; it does not certify chemical compatibility. This listing carries no potable, NSF, or food-grade certification and no chemical-compatibility data, so do not assume it for drinking water or any chemical service without confirmation. If you are sizing this as part of a private fire-protection stack, the fire-water reservoir design guide covers NFPA 22 sizing discipline and cold-climate freeze protection. For buried installations where the outer wall meets steel and coatings, the cathodic disbondment testing guide explains the ASTM G8, G42, and G80 methodology.
Freight and ordering
This Snyder double wall tank ships LTL freight, quoted live to your ZIP, from the nearest Snyder plant: Chowchilla, California or Lincoln, Nebraska. West and Mountain ZIPs quote against Chowchilla, Central and Eastern ZIPs against Lincoln, and our Freight Cost Estimator picks the nearest plant automatically, so eastern-seaboard buyers should expect a longer LTL lane and quote early. Because it is a large double wall unit, freight is calculated by destination, so get your real number before you order. To confirm fitting layout, lead time, or which plant ships to you, call us at 866-418-1777.
