The Snyder Industries 550 Gallon Plastic Vertical Double Wall Liquid Chemical Storage Tank pairs a primary chemical vessel and an integral secondary containment shell in one molded white assembly, so your secondary containment travels with the tank instead of being poured on site. It stands 65 inches tall on a 76 x 76 inch footprint, holds 550 gallons, and is molded in High Density Linear Polyethylene rated to a 1.5 specific gravity. That SG rating is the single most important number on this page: it tells you the heaviest liquid this vertical double wall tank is built to hold, and crossing it is the most common and most expensive mistake on a chemical storage tank.
Will it work for your application
Sized for primary chemical storage with built-in spill containment, this Snyder vertical tank carries a factory fitting package shown on the technical drawing on this page: a flange, an 18-inch PE threaded and vented fitting, and a manway with a 15-inch access opening. Plan your fill, vent, and outlet connections around those locations before you set the tank. The 15-inch access manway is also your instrumentation path, where radar, ultrasonic, or hydrostatic level sensors mount without cutting the shell; our guide on level gauge selection for chemical service walks through which technology fits your liquid. On weight, the shell sets empty and light enough for one person to position, then loads up: a full charge of water is about 4,587 lb, and the tank is rated to a maximum contents weight of roughly 6,880 lb at the 1.5 SG limit. Design your pad and anchoring around the 6,880 lb loaded figure, not the water weight. Match capacity to your duty cycle with the Tank Sizing Calculator or the Tank Sizing Guide.
Chemical compatibility
This tank is molded in HDLPE and rated to a 1.5 specific gravity, so it suits chemicals whose specific gravity falls at or below that rating. The following are compatible at the 1.5 SG rating, with the fitting and gasket materials called out per the OEM chemical-resistance chart, which is concentration and temperature specific: Acetic Acid (60%, PP/PVC fittings, EPDM gaskets), Aluminum Sulfate (50%, PVC, EPDM), Calcium Chloride (40%, PVC, EPDM), DEF (32.5%, 316SS, EPDM), Ferrous Sulfate (20%, PVC, EPDM), Magnesium Chloride (30%, PVC, EPDM), Sodium Carbonate (30%, PVC, EPDM), Urea Solution (50%, PP/PVC, EPDM), and Ozonated Water (up to 10 PPM, PVC, EPDM). Your gasket material is chemical-specific, so do not default to EPDM until you have confirmed your exact concentration, temperature, and gasket choice against the OEM chart.
Chemicals that need a higher-SG tank
Several common process chemicals are heavier than this 1.5 SG tank is rated to hold and require a 1.9 specific gravity vertical tank 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 selection tightens with these too: sodium hypochlorite, sulfuric acid, and hydrogen peroxide call for Viton, and peracetic acid calls for Aflas rather than EPDM. Check the full Chemical Compatibility Database and call us before ordering if your liquid appears here. For Snyder Captor double-wall projects, our walkthroughs on SPCC 40 CFR 112 compliance, freeboard sizing per ASTM D1998, and spillover redundancy engineering cover the engineering decisions around this class of tank.
Freight and how to order
Before you commit to freight, confirm the 65-inch height and 76 x 76 inch footprint clear your door, dock, and containment pad. This double wall tank stocks from two regions, Mississippi and West Virginia, and ships LTL freight from the nearest plant, Philippi, WV, with the rate quoted live to your ZIP, so a buyer west or south of WV may see a different origin on their quote. Get your number from the Freight Cost Estimator or call 866-418-1777, and our team will confirm fitting placement, gasket material, and the right SG rating for your chemistry before the tank leaves the line.
