The Snyder Industries 5000 Gallon ASTM XLPE Double Wall Tank (SKU 5630000N40) is a 5,000-gallon double-wall containment tank built from crosslinked linear polyethylene (XLPE) and rated to a 1.5 specific gravity. It stands 216 inches tall on a 102-by-102-inch square footprint, with the inner primary tank nested inside an outer secondary wall so a failure of the primary is captured in the interstitial space rather than reaching the floor or ground. For water and high-density liquid storage where a single-wall tank cannot be trusted to fail safely, this is the configuration that buys you a second chance.
Will it work for your application
The primary tank holds 5,000 gallons. Filled with water, the contents weigh about 41,700 lb, and at the tank's full 1.5 SG rating the maximum contents weight climbs to 62,550 lb. Size your pad, ring wall, or slab for the loaded weight, not the empty shell, and confirm the 102 x 102-inch footprint clears your access and setback before you commit the site. The 1.5 SG rating means this tank is built for liquids up to one-and-a-half times the density of water, so a buyer storing only water is not paying for unused capability - that rating is structural margin. If your fluid runs heavier than 1.5 SG, this is not the right unit. The Tank Sizing Calculator and Tank Sizing Guide walk you through matching capacity, weight, and freeboard to your fluid.
Per the technical drawing on this page, the tank carries a flange fitting, an 18-inch PE threaded and vented fitting, and a manway with 15-inch access for entry and inspection. The flange and threaded connections require you to match gasket material and bolt pattern to your fluid and pipe spec, and note that the 18-inch PE fitting is vented - it cannot be capped or plumbed as a sealed pressure port. Confirm your plumbing and vent runs against those locations early. This is a crosslinked (XLPE) wall, the right choice for the structural toughness and stress-crack resistance double-wall service demands.
Sizing and freeboard discipline
Double-wall tanks built to ASTM D1998 are not meant to be filled to the brim. Thermal expansion and density both eat into usable volume, and the freeboard you leave is part of the engineering, not an afterthought. The practical consequence: your working volume sits below the 5,000-gallon nameplate once freeboard is subtracted, so if you need a true 5,000 gallons of usable capacity, size up. The guide on Snyder Captor double-wall freeboard sizing per ASTM D1998 covers how thermal expansion, chemistry, and density set the real volume you can actually use. If you are spec'ing this tank for fire-water reserve, the writeup on fire-water reservoir tank design for rural and remote sites covers NFPA 22 sizing discipline and freeze protection for cold-climate service.
The mistake to avoid
The failure most operators miss on a tall double-wall tank happens at the vapor-saturated headspace, not the liquid line. Wall stress and premature cracking originate above the fill, where routine liquid-side inspection never looks. Read why wall failures originate at the vapor-saturated headspace before you set your inspection routine on a 216-inch-tall tank. And verify the rated interstitial capacity on the drawing rather than assuming it - the outer wall is the second chance, and you want to know exactly what it holds. For background on coating-adhesion test methodology in double-wall interstitial spaces, the writeup on cathodic disbondment testing for double-wall interstitial spaces (ASTM G8, G42, and G80) is worth reviewing.
This tank ships LTL freight from the Snyder plant in Lincoln, NE, the nearest named origin, and at 41,700 lb water weight on a 102-inch square footprint it is a dedicated heavy haul. At 216 inches - 18 feet - tall, it exceeds standard dock-door and many indoor clearances, and even the empty shell needs equipment to set on the pad, so confirm crane or forklift offload and overhead clearance before delivery. Freight is quoted live to your ZIP: get your exact number from the Freight Cost Estimator or call 866-418-1777 to lock in delivery and offload details before you order.
