The Snyder Industries 5500 Gallon Double Wall Tank (SKU 5660000N48) is a black crosslinked linear polyethylene (XLPE) water and heavy-liquid storage tank measuring 120 in W x 120 in L x 172 in H. It carries a 1.9 specific gravity rating, the number that matters most when matching a tank to a dense liquid: the wall is engineered to hold contents up to 1.9 times the density of water. The double-wall construction builds secondary containment into a single unit, so you get the primary vessel and the containment basin together instead of buying and siting a separate berm.
Will it work for your site?
This is a black XLPE double wall tank cataloged for water service, and at 1.9 SG the rating is the ceiling here - it already covers essentially any water-based or heavier liquid you would store in polyethylene. Plan your pad to the loaded numbers, not the empty tank. Full of water it holds roughly 45,870 lb of contents; at its maximum 1.9 SG rating it is engineered for up to about 87,153 lb. Design the foundation to that 87,153 lb maximum if any denser liquid is in play, and make sure the 120 x 120 in footprint sits on a level, fully supporting base. Run your capacity and freeboard math through the Tank Sizing Calculator and the Tank Sizing Guide before you order. The technical drawing on this page shows the fitting layout: a flange, an 18 in PE threaded and vented fitting, and a manway with 15 in access for interior entry and inspection.
The mistake to avoid
The most common error on a tank like this is treating the crosslinked wall as interchangeable with standard HDPE - XLPE is a different resin built for higher-density service, and the 1.9 SG rating is specific to this construction, so do not assume a linear polyethylene tank of the same gallonage carries the same loaded weight. The second miss is hardware: spec a gasket sized to the flange and a matching gasket for the 18 in threaded/vented port so both connections seal, rather than assuming stock parts fit. The third is skipping freeboard and thermal expansion. Our guide on Snyder Captor double-wall freeboard sizing per ASTM D1998 shows why usable volume is less than the nameplate gallons, and the companion piece on wall thickness at the vapor-saturated headspace explains where premature failures actually begin. For buried or fire-protection installs, see our notes on fire-water reservoir design and interstitial-space cathodic disbondment testing.
Freight
This double wall XLPE tank ships by LTL freight from Snyder's plant in Lincoln, NE, quoted live to your ZIP code. A tank this size and weight moves as a dedicated freight item, so get an exact number before you commit: use the Freight Cost Estimator or call 866-418-1777 and we will quote it to your delivery point. Listed price is before freight.
