The Snyder Industries 3500 Gallon Vertical Double Wall Liquid Chemical Storage Tank is a self-contained primary-plus-containment unit built for industrial chemical storage where a secondary barrier is required. It is rotationally molded in white High Density Linear Polyethylene (HDLPE) and carries a 1.5 specific gravity rating, meaning the wall is engineered for liquids up to 1.5 times the weight of water. The integrated outer tank captures any release from the inner vessel without a separate berm. As a Snyder double wall vertical storage tank, it answers the two questions every buyer starts with: what it holds and how it gets to your site.
Specifications, fittings, and siting
The footprint is 102 in x 102 in (an 8.5-foot square) and the overall height is 158 in, or 13.2 ft. Verify door, ceiling, and overhead clearance for indoor installs, and confirm crane or forklift reach for offload before delivery day. At full water the inner tank carries roughly 29,190 lb, and at its 1.5 SG rating the maximum contents weight reaches about 43,785 lb. That 43,785 lb figure assumes filling to the 1.5 SG rated level; for any chemistry approaching SG 1.5 you must derate fill height for freeboard and thermal expansion. Plan your pad, anchoring, and lifting capacity around the loaded numbers. Factory fittings include a flange, an 18-inch PE threaded/vented fitting, and a manway with 15-inch access for inspection and maintenance. Confirm fitting locations and elevations against the technical drawing on this page so your fill line, plumbing, and vent routing match what ships. To right-size the vessel for your turnover and freeboard, run the numbers through our Tank Sizing Calculator, review the Tank Sizing Guide, and plan wetted-material gauge selection with our level gauge selection guide.
Chemical compatibility
This tank is molded in HDLPE and rated to 1.5 specific gravity. Compatibility is concentration- and temperature-specific, so always confirm your exact chemistry against the OEM chemical-resistance chart and the elastomer and fitting materials below. At the 1.5 SG rating, this tank suits acetic acid (60%), aluminum sulfate (50%), calcium chloride (40%), diesel exhaust fluid / DEF (32.5%), ferrous sulfate (20%), magnesium chloride (30%), sodium carbonate (30%), urea solution (50%), and ozonated water (up to 10 PPM). Recommended fitting materials are PP/PVC for acetic acid and urea solution, and PVC for aluminum sulfate, calcium chloride, ferrous sulfate, magnesium chloride, sodium carbonate, and ozonated water. DEF is the one compatible chemistry here that calls for 316 stainless steel fittings rather than PVC or PP, so spec the right wetted metal on your DEF build. All of these chemistries specify EPDM gaskets.
Several common chemicals are NOT suited to this 1.5 SG tank and require a heavier 1.9 specific gravity vessel instead: ethylene glycol, ferric chloride, ferric sulfate, hydrochloric acid, hydrofluoric acid, hydrofluosilicic acid, hydrogen peroxide, peracetic acid, phosphoric acid, polyaluminum chloride, potassium carbonate, potassium hydroxide, propylene glycol, sodium bisulfate, sodium bisulfite, sodium hypochlorite, sodium thiosulfate, sulfuric acid, and zinc orthophosphate. Gasket choice on that heavier tank varies by chemistry: aggressive oxidizers and strong acids such as sodium hypochlorite, hydrogen peroxide, hydrochloric acid, and sulfuric acid call for Viton rather than EPDM, while peracetic acid specifically requires Aflas on a 316 stainless build, not Viton. Check your specific chemical, concentration, and temperature in our Chemical Compatibility Database before ordering.
The mistake to avoid
The most expensive error on a double wall chemical tank is under-rating specific gravity. The 1.5 SG ceiling is real: putting a heavier chemistry like sulfuric acid or ferric chloride into this tank exceeds its structural rating and will shorten its life, even if the polyethylene resists the chemical. Match your chemical to the SG rating first, then derate fill height for freeboard, then the fitting and gasket materials. For containment and freeboard design, our Captor freeboard sizing walkthrough, the SPCC 40 CFR 112 compliance guide, and our spillover redundancy engineering guide walk through the alarm and cutoff architecture worth specifying alongside the tank.
This Captor double wall tank ships by LTL freight and fulfills from Snyder's plant in Lincoln, NE, with West Virginia stock also available depending on inventory, so distance and cost to East-Coast ZIPs can swing with the fulfilling plant. The list price does not include freight. Get a freight quote to your ZIP in seconds with our Freight Cost Estimator, or call 866-418-1777 to confirm fittings, lead time, and freight before you order.
