The Snyder Industries 360 Gallon Vertical Double Wall Liquid Chemical Storage Tank (SKU SII-5760102N45) does one job: it holds aggressive liquids inside a secondary containment shell so a primary-tank breach never reaches the floor. It is a double wall vertical tank measuring 63 inches tall on a 53 x 53 inch footprint, molded in white High Density Linear Polyethylene (HDLPE) and rated to a 1.9 specific gravity. That 1.9 rating is the highest standard SG band Snyder builds, which is exactly why it belongs under dense chemicals - it is the first number to check against your product before you order.
Will this tank work for your application
The integrated outer wall gives you built-in containment without pouring a separate berm, which is why buyers searching for a vertical storage tank or double wall tank land here. Full of water (specific gravity 1.0) the contents weigh about 3,002 lbs; loaded to its full 1.9 SG rating the contents can reach roughly 5,705 lbs. Spread across the 53 x 53 inch footprint (about 19.5 square feet), that is close to 290 lbs per square foot of bearing load - the figure to hand your slab and anchoring design. Top fittings include an 18-inch PE threaded and vented opening plus a manway with a 15-inch access opening, enough clearance for a tech to reach in and inspect or clean the primary tank, a real consideration on a containment vessel you cannot easily replace. Confirm the exact fitting layout and elevations against the technical drawing on this page before you commit your plumbing.
Why 1.9 SG matters here
A 1.9 specific gravity rating is the top of Snyder's standard band, so this tank carries dense chemicals that would over-stress a lower-rated wall. Several products in the compatibility list below - 98% sulfuric acid, 85% phosphoric acid, 50% ferric chloride - are heavy enough that the 1.9 rating is the reason to choose this tank rather than a cheaper standard-wall or lower-SG vessel. Match the rating to the densest liquid you will actually store, not the average.
Chemical compatibility
This tank is molded in HDLPE and rated to a 1.9 specific gravity, which covers a wide band of water-treatment and industrial chemicals. Always match the fitting and gasket materials to your chemical, and verify concentration and temperature against the OEM chemical-resistance chart, which is concentration- and temperature-specific. Commonly stored chemicals that fit within the 1.9 SG rating include:
- Acetic Acid (60%) - PP/PVC fittings, EPDM gaskets
- Aluminum Sulfate (50%) - PVC fittings, EPDM gaskets
- Calcium Chloride (40%) - PVC fittings, EPDM gaskets
- DEF (32.5%) - 316SS fittings, EPDM gaskets
- Ethylene Glycol (100%) - PVC fittings, EPDM gaskets
- Ferric Chloride (50%) - PVC fittings, EPDM gaskets
- Hydrochloric Acid (37%) - PVC fittings, Viton gaskets
- Hydrofluoric Acid (48%) - PP/PVC fittings, Viton gaskets
- Hydrofluosilicic Acid (26%) - PP/PVC fittings, Viton gaskets
- Hydrogen Peroxide (50%) - PVC fittings, Viton gaskets
- Phosphoric Acid (85%) - PVC fittings, Viton gaskets
- Peracetic Acid (30%) - 316SS fittings, Aflas gaskets
- Potassium Hydroxide (Saturated) - PVC fittings, EPDM gaskets
- Sodium Hypochlorite (under 16.5%) - PVC fittings, Viton gaskets
- Sodium Carbonate (30%) - PVC fittings, EPDM gaskets
- Sulfuric Acid (98%) - CPVC fittings, Viton gaskets
- Urea Solution (50%) - PP/PVC fittings, EPDM gaskets
- Ferric Sulfate (60%), Ferrous Sulfate (20%), Magnesium Chloride (30%), Potassium Carbonate (50%), Sodium Thiosulfate (40%) - PVC fittings, EPDM gaskets
- Polyaluminum Chloride, Sodium Bisulfate, Sodium Bisulfite, Zinc Orthophosphate, Propylene Glycol - confirm concentration for your service
- Ozonated Water (up to 10 PPM) - PVC fittings, EPDM gaskets
For the full set of chemical, fitting, and gasket combinations, see the Chemical Compatibility Database.
The mistake to avoid
The most common error on a double-wall chemical tank is treating the fitting and gasket materials as interchangeable across the list above. The strong oxidizers and aggressive acids - hydrochloric acid, hydrogen peroxide, sodium hypochlorite, phosphoric acid, hydrofluoric acid, and hydrofluosilicic acid - all call for Viton gaskets rather than EPDM; 98% sulfuric acid steps up to CPVC fittings with Viton; and peracetic acid moves to 316SS fittings with Aflas gaskets. DEF is the deceptive one: it is a mild fluid, but it requires 316SS wetted hardware (not PVC) to stay ISO-22241 clean - a PVC fitting will quietly contaminate the batch. Spec the wrong gasket or fitting and you get a slow leak at the bulkhead long before the tank itself ever fails. Use the freeboard sizing guide to set usable volume against thermal expansion, the level gauge selection guide for instrumentation, and the SPCC 40 CFR 112 walkthrough plus spillover redundancy guide to design your containment and alarm layers.
Sizing and freight
To pin down usable capacity against freeboard, run your numbers through the Tank Sizing Calculator and the Tank Sizing Guide. This tank ships LTL freight from the Snyder plant in Marked Tree, AR, with delivery quoted live to your ZIP code - get your number from the Freight Cost Estimator or call 866-418-1777. Confirm your fittings and gasket materials against the technical drawing on this page and your chemical's data sheet before you order.
