The Snyder Industries 1000 Gallon ASTM XLPE Black Double Wall Tank (SKU 5990102N48) is a crosslinked linear polyethylene double wall tank built to store demanding, dense liquids without a separate containment basin. The black tank carries a 1.9 specific gravity rating, meaning it is engineered to hold contents up to 1.9 times the density of water, and the integrated outer wall provides built-in secondary containment for the full inner-tank volume. It stands 69 inches tall on an 81 x 81 inch square footprint, so it fits a contained pad without the cost and floor space of an external dike. Snyder stocks this XLPE double wall tank at two plants, Chowchilla, CA and Lincoln, NE, so freight ships from whichever is closer to your ZIP. If you are matching tank size against your actual draw and refill schedule, run the numbers through our Tank Sizing Calculator and the Tank Sizing Guide before you commit.
Will this tank work for your application?
Capacity is a nominal 1000 gallons. Plain water at full volume weighs about 8,340 pounds, and the tank is rated to carry contents up to roughly 15,846 pounds at its 1.9 specific gravity ceiling, so confirm your pad, slab, or stand is sized for the loaded weight of the liquid you actually intend to store. The 1.9 SG rating is the heavy-duty tier; it carries dense contents that a standard 1.0 to 1.5 SG single-wall water tank cannot, which is the reason to step up to crosslinked construction here. Stock fittings shown on the technical drawing include an 18 inch PE threaded and vented fitting plus a manway with a 15 inch access opening. The manway with 15 inch access takes a standard gasketed lid for sealed inspection and cleanout, and the 18 inch PE threaded and vented fitting accepts a vented cap or threaded bulkhead for your fill and vent line. Confirm gasket sizing and bulkhead thread against the drawing dimensions before ordering accessories, and review the technical drawing on this page for exact fitting locations and elevations against your plumbing and venting plan.
Double-wall sizing and freeboard
Double wall tanks carry usable-volume and freeboard considerations that are easy to overlook. The interstitial space, vent sizing, and thermal expansion behavior all affect how much liquid you can actually put in versus the nameplate number, and the interstitial space is monitoring and containment volume, not added capacity. Our guide on Snyder Captor double-wall freeboard sizing per ASTM D1998 walks through how density and thermal expansion shape real usable volume, and the companion piece on wall thickness at the vapor-saturated headspace explains where premature failures originate and why liquid-side inspection often misses them. For a contained reservoir feeding a fire-protection or emergency-supply role, the fire-water reservoir design guide covers NFPA 22 sizing discipline and cold-climate freeze protection.
The mistake to avoid
The most common error on a 1.9 SG double wall tank is treating the specific gravity rating as a suggestion rather than a hard limit. The 1.9 figure is the maximum content density the wall is built for; storing a liquid heavier than that, or assuming the rating leaves headroom for surge or overfill, overstresses the wall over time. Match your liquid's density to the rating with margin to spare. At 69 inches tall on an 81 inch square footprint, also confirm doorway and overhead clearance and a contained pad of at least 81 x 81 inches plus working room around the manway. If your service involves a buried steel outer wall or a coated containment boundary, our reference on cathodic disbondment testing per ASTM G8, G42, and G80 explains the coating-adhesion concerns that apply at that boundary.
This double wall tank ships LTL freight from the nearest Snyder plant to your ZIP, either Chowchilla, CA or Lincoln, NE, whichever is closer. Freight is quoted live to your delivery ZIP, so get an exact number through our Freight Cost Estimator or call 866-418-1777 and we will work it out with you. Confirm whether you need a liftgate or limited-access delivery when you request the quote, since a tank this size needs room to come off the truck.
