The Snyder Industries 12500 Gallon ASTM Black Double Wall Tank (SKU 1031100N51) pairs a 12,500-gallon primary vessel with an integral secondary containment wall, giving you a self-contained double wall tank for large-volume water and bulk-liquid storage without building a separate berm or dike. It is molded in high density linear polyethylene, carries a 1.9 specific gravity rating, and stands 274 inches tall on a roughly 11.8-foot-square footprint (142 x 142 inches) - a genuinely tall black tank at more than 22 feet, so plan your site, canopy clearance, and fill access around that height before it arrives.
Will it work for your site?
Rated capacity is 12,500 gallons of primary storage. Filled with water at roughly 8.34 pounds per gallon, contents alone run about 104,250 pounds, and the tank's maximum rated contents weight at its 1.9 specific gravity is 198,075 pounds. Those are the numbers your pad and foundation engineer needs: a slab under this tank is carrying about 52 tons at full water, and nearly 100 tons if you ever store a liquid at the full 1.9 specific gravity rating. The 1.9 SG rating is the ceiling - it tells you the wall was built to hold liquids up to 1.9 times the density of water, not that any given fluid is appropriate. Run your dimensions and target volume through our Tank Sizing Calculator and Tank Sizing Guide to confirm freeboard and usable volume before you commit; ASTM D1998 tanks are sized with expansion headspace in mind, and our Snyder double-wall freeboard sizing guide walks through why the number on the label is not always the number you can actually use.
Fittings and access
Per the technical drawing on this page, this tank is configured with a flange, an 18-inch PE threaded and vented fitting, and a manway with 15-inch access - all serving the primary vessel. That vented top fitting matters on a tank this tall: a sealed 12,500-gallon vessel that cannot breathe during rapid fill or draw-down can deform, so keep the vent clear and unobstructed. Make up field connections at the flange and 18-inch threaded fitting with gaskets rated to your stored fluid, and reseat the 15-inch manway lid gasket after any interior inspection. Confirm the flange and outlet locations against the drawing before you set the tank and plumb it, because repositioning fittings on a vessel this size is not a field job. Because this is a double wall tank, plan a separate leak-detection port so the interstitial (annular) space between the primary and secondary walls stays accessible for monitoring - the outer wall is your last line of containment, not a spare.
Freight and next steps
This double wall tank ships LTL from Snyder's plant in Lincoln, Nebraska, quoted live to your ZIP - at this height and weight it moves as an oversized load, so delivery logistics and offload equipment are part of the plan, not an afterthought. Listed at list price before freight; get a real number with our Freight Cost Estimator or call 866-418-1777 and we will quote it to your delivery address. If this black tank is destined for rural fire-water or reservoir duty, our fire-water reservoir design guide and our note on HDPE wall thickness at the vapor-saturated headspace are worth reading before you finalize the spec.
