The Snyder Industries 6500 Gallon ASTM XLPE Double Wall Tank (SKU 5670000N40) is a crosslinked polyethylene double wall tank built for demanding bulk storage where secondary containment is required. Molded in natural white crosslinked linear polyethylene, it uses tank-within-a-tank construction: the inner primary vessel holds the liquid, the outer wall captures a leak, and the interstitial space between them is the safety margin that keeps a spill off your pad. At 6,500 gallons it is also sized for high-volume water duty, including the kind of on-site fire-water reservoir covered in our fire-water reservoir tank design guide.
Quick specs: 199 in tall (about 16.6 ft) on a 120 x 120 in square footprint; natural white XLPE; 1.5 specific gravity rating. Full of water it carries about 54,210 lb of contents, and at its maximum 1.5 SG the primary holds up to roughly 81,315 lb.
Will it work for your site
Plan your slab, ring wall, or foundation around the loaded weight, not the empty shell, and confirm the 120 x 120 in footprint has level, continuous bearing across the full base. Because this is a tall vessel at roughly 16.6 ft, verify overhead clearance and tilt-up or crane access at the site before you schedule the LTL delivery. Run your capacity numbers through our Tank Sizing Calculator and the Tank Sizing Guide if you are still comparing this double wall tank to other sizes.
Fittings and the connections that drive your plumbing
The factory layout on this unit includes a flange, an 18-inch polyethylene threaded and vented fitting, and a manway with 15-inch access for interior entry, gauging, and maintenance. Match your gasket material and bolt pattern to the flange, and size your vent and valve to the 18-inch threaded fitting before ordering hardware. Review the exact fitting positions, elevations, and sizes against the technical drawing on this page, since outlet placement drives your piping runs.
Crosslinked polyethylene and the 1.5 SG ceiling
Crosslinked linear polyethylene (XLPE) is the resin Snyder molds for this double wall tank. The 1.5 specific gravity rating is the ceiling to respect: water is 1.0 SG, so you have real margin, but verify your stored liquid stays at or below 1.5 SG at your service temperature. The common mistake on a tank this large is sizing to the nameplate gallons and ignoring freeboard and thermal expansion. Our guide on Captor double-wall freeboard sizing per ASTM D1998 covers real usable volume versus rated volume, and the vapor-saturated headspace wall thickness discussion explains where these tanks actually get inspected.
Interstitial monitoring
A double wall only pays off if the interstitial space is monitored. Keep the annular space clear and set up leak detection so a breach in the primary is caught before it becomes a release. For buried steel outer-wall systems, the cathodic disbondment testing methodology guide covers the boundary-condition details worth understanding.
This double wall XLPE tank ships LTL freight from Snyder's plant in Lincoln, NE, with the rate quoted live to your ZIP. Get an exact number through our Freight Cost Estimator, or call 866-418-1777 and we will help you spec fittings, confirm the drawing, and lock in delivery.
