The Snyder Industries 120 Gallon HDPE Vertical Chemical Storage Tank is a 1.9 specific-gravity vessel built for dense liquid chemical service, standing 51 inches tall on a compact 34 x 34 inch footprint. Molded from polyethylene in white, this vertical storage tank holds 120 gallons and carries a 1.9 SG rating, meaning it is engineered to hold contents up to 1.9 times the density of water without the wall-stress failures that hit a 1.0 or 1.5 SG tank when filled with a heavy chemical. Filled with water it carries roughly 1,001 pounds; at its maximum rated content density it is built to support up to 1,902 pounds. That high SG rating is the whole point of this tank, and it is also where buyers make the most expensive mistake.
How this tank works
The tank is fitted from the factory with a flange, a 14-inch polyethylene threaded and vented fill opening, and a manway with 11-3/8 inch access for inspection, cleaning, and gauge or fitting installation. Verify that your level sensor, agitator, or cleaning tooling clears that 11-3/8 inch manway opening before you order. The vented opening matters for chemical service: filling and draining a sealed tank pulls a vacuum or builds pressure, so the vent keeps the wall from collapsing or ballooning. The compact 34 x 34 inch base passes through a standard 36-inch doorway and sits inside most 4 x 4 ft secondary containment basins, while the 51-inch height keeps it workable for tight pump skids and indoor batch rooms where a wider tank would not fit. Confirm the exact fitting positions against the technical drawing on this page before you plumb the system, and use our Tank Sizing Calculator and Tank Sizing Guide to right-size capacity against your real draw-down and refill cycle.
Chemical compatibility
This is a polyethylene tank rated to 1.9 specific gravity. The resin designation in our data still reads HDLPE with a question mark, so confirm the exact resin type with us at 866-418-1777 before committing it to chemical service, because different polyethylene resins behave differently against oxidizers and solvents. Within its compatibility envelope this tank handles a wide chemical range. Acids include acetic acid at 60%, hydrochloric acid at 37%, hydrofluoric acid at 48%, hydrofluosilicic acid at 26%, phosphoric acid at 85%, peracetic acid at 30%, and sulfuric acid at 98%. Treatment chemicals include aluminum sulfate at 50%, ferric chloride at 50%, ferric sulfate at 60%, ferrous sulfate at 20%, polyaluminum chloride, sodium hypochlorite below 16.5%, sodium bisulfate, sodium bisulfite, sodium carbonate at 30%, potassium carbonate at 50%, potassium hydroxide (saturated), sodium thiosulfate at 40%, and zinc orthophosphate. It also handles calcium chloride at 40%, magnesium chloride at 30%, hydrogen peroxide at 50%, ozonated water up to 10 PPM, ethylene glycol, propylene glycol, and urea solution at 50%. It stores diesel exhaust fluid (DEF) at 32.5%, but only with 316 stainless steel fittings and EPDM gaskets, since DEF is contaminated by standard steel or brass hardware.
The fitting and gasket material is what fails first, not the tank wall, so match them to the chemical. PVC fittings with EPDM gaskets cover most salts and bases here; oxidizers and strong acids such as hydrochloric, hydrofluoric, phosphoric, hydrogen peroxide, sodium hypochlorite, and sulfuric acid call for Viton gaskets (with CPVC fittings on 98% sulfuric), and peracetic acid needs Aflas gasketing with 316SS fittings. Always cross-check your exact chemical, concentration, and temperature against the OEM chemical-resistance chart, since ratings are concentration- and temperature-specific and a margin that holds at ambient can disappear when the liquid runs warm. Start with our Chemical Compatibility Database and the per-chemical pages, including sodium hypochlorite, sulfuric acid, hydrochloric acid, ferric chloride, and DEF.
The mistake to avoid
The costly error on a dense-chemical tank is undersizing the SG rating. This unit is rated to 1.9 SG specifically so it can hold heavy liquids; a standard 1.0 or 1.5 SG tank filled with the same chemical will see hoop stress beyond what its wall was molded for and can fail at the seams. There is no reason to buy up in SG above this 1.9 rating for a tank this size, so confirm your chemical's specific gravity, keep it at or below 1.9, and do not let a vendor talk you into a lower rating. The second check is structural: at maximum rated density this tank concentrates roughly 1,900 pounds on its 34 x 34 inch base, about 8 square feet, so confirm your pad, skid, or floor is rated for that load before you fill. For deeper planning on instrumentation and containment, see our guides on tank level gauge selection for chemical service, the Snyder Captor Plus 110% containment comparison, and the 120 gallon vertical liquid storage tank buyer's guide.
This Snyder vertical tank ships LTL freight from Marked Tree, Arkansas, quoted live to your ZIP. Get a freight quote in seconds with our Freight Cost Estimator, or call 866-418-1777 to confirm resin type, fitting layout, and the nearest shipping point for your project.
