The Snyder Industries 1100 Gallon Double Wall Liquid Storage Tank is a tank-within-a-tank built for the jobs where a single-wall tank is not enough: containment is engineered into the unit itself. The primary tank holds 1,100 gallons of liquid, and the outer wall provides built-in secondary containment so a primary breach is caught instead of spilled. It is molded from high density linear polyethylene (HDLPE) in white, stands 104 inches tall on a square 76 x 76 inch footprint, and carries a 1.9 specific gravity rating - meaning the wall is engineered to hold liquids up to 1.9 times the weight of water.
Will it work for your liquid?
Start with weight, because that is what decides your pad, your anchoring, and your forklift. Filled with water at full capacity, this tank carries about 9,174 lb of contents. At its maximum rated contents weight - liquid up to the full 1.9 specific gravity - it carries roughly 17,431 lb. The 1.9 specific-gravity rating is headroom you have already paid for: it lets this tank carry denser liquids up to 1.9 times the weight of water where a standard 1.0 to 1.5 SG water tank would be over its rating. Plan the slab, the anchoring, and the lifting equipment around that heavier number if you are storing anything denser than water. The 76 x 76 inch footprint is the same dimension for both length and width, so it drops square onto a pad without a long side to orient.
For fittings, this unit is configured with a flange, an 18-inch PE threaded and vented opening (the vent matters - a sealed tank can collapse on fast draw-down or balloon on fill), and a manway with a 15-inch access opening large enough for inspection and cleanout entry. Confirm thread and outlet sizes against your plumbing before install, and confirm your gasket and fitting materials are rated for your stored liquid - on a 1.9 specific-gravity tank you may be running something more aggressive than water, and the seal is only as compatible as its weakest gasket. Check the technical drawing on this page for the exact fitting callouts and their placement on the tank. If you are still settling on the right capacity for your draw-down and refill cycle, the Tank Sizing Calculator and Tank Sizing Guide walk through it.
Double-wall sizing and freeboard
A double-wall storage tank earns its keep on containment and on the freeboard math behind it. Usable volume is always less than the 1,100-gallon nameplate once you reserve freeboard for thermal expansion - size your draw-down against usable volume, not nameplate. If this tank is going into spill-prevention service, the way you size usable volume against thermal expansion and density matters. Our walkthrough on freeboard sizing per ASTM D1998 covers the real volume you can actually use, and the SPCC 40 CFR 112 compliance walkthrough shows how a double-wall unit fits an oil-storage containment plan. For long-term integrity, our note on wall thickness at the vapor-saturated headspace explains where premature failures originate and why liquid-side inspection misses them.
The mistake to avoid
Do not size the slab or the rigging around the water number. This is a 1.9 specific gravity tank, and a buyer who plans for 9,174 lb of water and then fills it with a denser liquid is loading the pad for up to 17,431 lb. Treat that heavier rated weight as your design load. And remember the outer wall is your secondary containment, not a place to add penetrations; keep your fittings on the primary tank as configured.
At 104 inches tall on a square 76 x 76 footprint, confirm your door and overhead clearance and that your forklift can reach the lift point before delivery. This 1100 gallon white double wall Snyder storage tank ships LTL freight from the Snyder plant in Philippi, West Virginia at up to 17,431 lb rated, so the receiving end needs equipment matched to the heavier number. Freight is quoted live to your ZIP - get your number with the Freight Cost Estimator or call us at 866-418-1777. Freight is quoted separately from the list price and is not included in it.
