The Snyder Industries 360 Gallon ASTM XLPE Double Wall Tank is a crosslinked polyethylene double-wall vessel built for demanding water and liquid storage where secondary containment matters. It holds 360 gallons in a 53-inch by 53-inch footprint and stands 63 inches tall, so it fits tight equipment pads and containment areas without sprawling across a site. The natural white XLPE exterior wraps an integrated outer wall, giving you built-in secondary containment without pouring a separate concrete dike.
Will it work for your site?
This is a crosslinked linear polyethylene (XLPE) double wall tank with a 1.9 specific gravity rating, so the shell is engineered for contents well heavier than water. For plain water, plan around roughly 3,002 pounds of contents; the 1.9 SG rating exists so the same tank can carry a denser liquid up to 5,705 pounds. Size your pad and hold-downs to those weights, not the empty shell. Access and venting come from an 18-inch PE fitting that is both threaded and vented, plus a manway with a 15-inch clear access opening for interior inspection and cleaning. Before commissioning, confirm the manway lid gasket seats cleanly, since a double-wall interstitial space only stays sealed if the lid does. Check the technical drawing on this page for exact fitting placement before you set piping, and run your volume through our Tank Sizing Calculator and Tank Sizing Guide if you are still deciding between sizes.
The double-wall advantage
The double-wall build puts an interstitial space between the primary tank and the outer shell, which is why these Snyder units get specified for sites that need containment without external berms. For how Snyder sizes freeboard and usable volume per ASTM D1998, see our Captor double-wall freeboard sizing guide. If you plan to monitor the interstitial space over the tank's life, our interstitial-space and disbondment testing guide covers the methodology that matters at the polyethylene boundary.
The mistake to avoid
Do not undersize the foundation for the rated load. Buyers see the water weight and forget this XLPE shell is rated to 1.9 SG, so if you ever store a denser liquid the pad and anchoring have to handle up to 5,705 pounds. Match your hold-downs to the rated content weight, not the water figure.
This 53 x 53-inch double wall XLPE tank is a heavy LTL item, shipping from the Snyder plant in Marked Tree, Arkansas with freight quoted live to your ZIP. Pre-check your dock and forklift access for the footprint, then get a rate with our Freight Cost Estimator or call 866-418-1777 to lock in your order.
