The Snyder Industries 8700 Gallon Double Wall Liquid Storage Tank is built from High Density Linear Polyethylene in Snyder's 1.9 specific-gravity resin formulation - the same resin family carried on heavier-than-water service. At 197 inches tall (about 16.4 feet) on a 142 x 142 inch footprint, it is a primary-and-secondary containment system in one unit: the inner tank holds product, the outer wall catches it if the inner ever fails. That integrated containment is why operators searching for a double wall tank, double wall storage tank, or acid storage tank land here instead of buying a single-wall tank plus a separate poly basin.
Will it work for your job
Capacity is 8700 gallons in white HDLPE, with the resin rated to 1.9 specific gravity - liquids heavier than water. Note up front that 8700 gallons is rated capacity, not working draw: usable volume and thermal freeboard live inside that number, so plan your fill cycle against the working figure, not the nameplate. Two weights drive your pad and structural design: filled with water this tank weighs about 72,558 lb, and its maximum rated contents weight is 137,860 lb. Engineer the foundation around the 137,860 lb figure if you intend to store a high-density liquid, not the water number - that is the gap that catches people. The 142 x 142 inch footprint and roughly 16.4-foot height set your slab size and overhead clearance; confirm both, plus door and ceiling access for a unit this tall, against your site before ordering. If you are still deciding between sizes, the Tank Sizing Calculator and Tank Sizing Guide will help you match capacity and freeboard to your actual draw and refill cycle.
Double-wall containment and freeboard
A double wall tank is sized differently than a single-wall tank because you have to account for usable volume and thermal freeboard inside the rated capacity. Our guide on Snyder Captor double-wall freeboard sizing per ASTM D1998 walks through how density and thermal expansion eat into the volume you can actually use. If this tank is going toward spill-containment compliance, the Snyder Captor double-wall SPCC 40 CFR 112 walkthrough covers how the integrated secondary wall maps to containment requirements. Operators in cold climates should also review where the HDPE wall thickness at the vapor-saturated headspace tends to drive premature failures - the part liquid-side inspections miss.
The mistake to avoid
The 1.9 SG resin rating tells you the tank is qualified for a heavy liquid - but it does not by itself approve your specific chemical at your concentration and temperature. Before committing this tank to any service, confirm your fluid, concentration, and operating temperature against the manufacturer's chemical-resistance data, and match your fittings and gaskets accordingly. Fittings and outlet configuration are quoted with the order - call 866-418-1777 and we will spec them to your fluid so that instruction has a path, not a dead end. Buy the resin spec to the job, and size your foundation to the full 137,860 lb rated weight rather than the 72,558 lb water figure.
This tank ships LTL from Snyder's plant in Lincoln, Nebraska, with freight quoted live to your ZIP. Get a freight quote with the Freight Cost Estimator or call us at 866-418-1777 and we will work out the rigging and offload for a unit this size. Listed before freight - we quote the LTL leg to your exact destination so you see the real number before you commit.
