The Snyder Industries 500 Gallon ASTM XLPE Black Double Wall Tank (SKU 5780102N48) is a self-contained double wall vertical tank built for sites that need secondary containment without a separate dike or basin. The inner tank holds 500 gallons; the integral outer wall captures any inner-tank leak so the contents stay off the ground. It stands 81 inches tall on a 53 x 53 inch footprint, is molded in black crosslinked linear polyethylene (XLPE), and carries a 1.9 specific gravity rating.
Will it work for your site?
The footprint is 53 by 53 inches, so plan a level pad at least that size plus working clearance around the manway. At 81 inches tall it will not pass through a standard 80-inch doorway upright, so plan placement and rigging before delivery. Filled with water, the inner tank carries roughly 4,170 pounds; the structure is rated to a maximum contents weight of 7,923 pounds. That 1.9 specific gravity rating is the buying advantage: it is the same 53 x 53 footprint rated for liquids nearly twice the weight of water, so you are not forced up to a larger or heavier-duty model for a dense chemistry. A 1.5 specific-gravity fluid puts you near 6,250 pounds, still inside the 7,923 pound ceiling. Confirm your pad and any platform can carry the full filled load before you set the tank. If you are not sure 500 gallons is the right size, run the numbers in our Tank Sizing Calculator or read the Tank Sizing Guide.
Fittings and access
The drawing for this double wall tank shows an 18-inch PE threaded and vented lid plus a manway with 15-inch access for filling, inspection, and cleanout. The 18-inch threaded lid is the primary fill and vent point, so match your fill line and any vent piping to it and confirm gasket compatibility on the threaded connection before you plumb it. Use the technical drawing on this page to confirm fitting locations and clearances against your plumbing before you order. The double-wall design adds an interstitial space between the inner and outer walls, and that boundary is what does the containment work; if you want to understand how that space is monitored and tested, see our guide on interstitial-space testing methodology.
The mistake to avoid
The most common error on a double wall XLPE tank is treating the 1.9 specific gravity rating as the usable fill line. That rating is the structural ceiling, not a license to fill to the brim with a dense liquid. ASTM D1998 sizing calls for freeboard above the working level for thermal expansion and density, so the volume you can actually use sits below the nameplate. Before you commit to this 500 gallon black double wall tank for anything heavier than water, work through our guide on Snyder Captor double-wall freeboard sizing per ASTM D1998 so the real working volume matches your job.
This double wall tank ships LTL from one Snyder plant in Marked Tree, Arkansas, so freight scales with distance to your site. Run your ZIP in our Freight Cost Estimator for a live number before you compare total cost against a closer-sourced tank, or call 866-418-1777 and we will quote freight and answer any sizing questions before you buy.
