Snyder Industries 3500 Gallon Plastic Vertical Double Wall Liquid Chemical Storage Tank in White

Why double wall

A single wall tank of regulated chemical needs a berm sized to its volume, and at 3,500 gallons that is a concrete basin, a sump, a drain valve that must stay closed, and a rain problem. A double wall tank carries its containment inside the outer shell, so the 102 inch footprint is the whole footprint and the tank can stand inside an occupied building where a spill must never reach a floor drain; the SPCC 40 CFR 112 compliance walkthrough sets out where a double wall tank meets a spill plan without a berm. What follows is the chemistry the resin is rated to hold; check the liquid at its concentration in the chemical compatibility database, because weight rating and chemical resistance are separate properties, and work out the usable volume once thermal expansion and the interstice are accounted for with the Captor double wall freeboard sizing guide. The tank sizing calculator works the volume out from feed rate and delivery interval, and the tank sizing guide covers the reserve.

Grades on the 102 x 158 inch double wall, and the sizes beside it

The N43 is the 1.5 specific gravity grade, 400 pounds lighter, for coagulants and brines that never approach the density this wall is sized for, and the N40 is cross-linked polyethylene for oxidizers at that same weight. The N30 is the sulfuric acid grade at this tank's weight. The 5590000N45 is the 3,000 gallon double wall, 16 inches shorter on the same base, and the 5610000N30 is the 4,000 gallon step up at 178 inches.

Not sure which one? Tell us the liquid, the site and the ceiling height at 866-418-1777, or request a written quote with freight to your ZIP.

Access, high-level alarm, interstitial port

• Access: 18 inch threaded, vented manway on the primary, 158 inches up; vent outside on caustic and acid service, fill through a dip tube, and size the vent for a tanker's unload rate.
• Outlet: one penetration through both walls, a flanged transition, an expansion joint, and a valve on its own support; specify the fitting for the chemical when ordering.
• Service limit: 120 F / 48 C.

Watch two levels: the primary, with a sender chosen for the chemical per the level gauge selection guide, and the interstitial space, monitored with a float or conductivity switch, looked at each shift, and logged each week. Anything found in the space is a primary leak, and the tank comes out of service that day. A tank filled from a tanker is also where overfills happen; the tank spillover redundancy guide covers the high-level alarm and automatic cutoff that stop a release before the interstice has to catch it. Full, the tank loads a 102 inch circle to 55,461 pounds at the rating: an engineered slab in full contact under the whole floor, with the empty tank strapped against wind, and at 158 inches the manway is reached from a fixed platform.

When the truck arrives

A tanker's pump moves liquid faster than a manway vent can pass air, so either the vent is sized to the unload rate or the fill comes in through its own top bulkhead with a separate vent line. Run the fill pipe to the floor so caustic or coagulant does not free-fall and foam. Dense liquids heat up when diluted, so a tank topped off with water for a batch is filled water first, chemical second. The first fill of a new tank is watched end to end: slab edge, outlet fitting and interstitial port, checked as the level comes up.

Applications

Caustic, coagulant and acid bulk storage at water systems that cannot build a berm, chemical storage inside occupied buildings, and any regulated liquid at plant scale at a site an inspector visits. Label it for the fire inspector and the workplace inspector at once, keep one chemical in it, and keep the manway closed.

On the truck

At 102 inches across and 158 inches long on the deck the 5600000N45 is oversize freight (NMFC 156600) on a flatbed at a lane rate; the freight cost estimator quotes the haul to your ZIP; what is listed is the price before freight. A crane or a forklift with long forks sets 2,500 pounds on the slab. Prove the primary with water and a dry interstice through the hold; drain and dry before chemical goes in. Mark the vent and the outlet on the outside of the shell so nobody caps the wrong one in the dark.

Rated chemistries for this tank

The manufacturer lists these liquids for this resin at the concentrations noted, with the fitting and gasket material to specify. Check the concentration and temperature you actually run on the linked page or in the chemical compatibility database before ordering.

• details ); Aluminum Sulfate (50%, PVC, EPDM
• details ); Calcium Chloride (40%, PVC, EPDM
• details ); DEF (32.5%, 316SS fittings, EPDM
• details ); Ethylene Glycol (100%, PVC, EPDM
• details ); Ferric Chloride (50%, PVC, EPDM
• details ); Ferric Sulfate (60%, PVC, EPDM
• details ); Ferrous Sulfate (20%, PVC, EPDM
• details ); Hydrochloric Acid (37%, PVC, Viton
• details ); Hydrofluoric Acid (48%, PP/PVC, Viton
• details ); Hydrofluosilicic Acid (26%, PP/PVC, Viton
• details ); Hydrogen Peroxide (50%, PVC, Viton
• details ); Magnesium Chloride (30%, PVC, EPDM
• details ); Peracetic Acid (30%, 316SS, Aflas
• details ); Phosphoric Acid (85%, PVC, Viton
• details ); Polyaluminum Chloride (PVC, EPDM
• details ); Potassium Carbonate (50%, PVC, EPDM
• details ); Potassium Hydroxide (saturated, PVC, EPDM
• details ); Propylene Glycol (PP/316SS, EPDM
• details ); Sodium Bisulfate (PVC/PP, EPDM
• details ); Sodium Bisulfite (PVC/PP, EPDM
• details ); Sodium Carbonate (30%, PVC, EPDM
• details ); Sodium Hypochlorite (under 16.5%, PVC, Viton
• details ); Sodium Thiosulfate (40%, PVC, EPDM
• details ); Sulfuric Acid (98%, CPVC, Viton
• details ); Urea Solution (50%, PP/PVC, EPDM
• details ); Zinc Orthophosphate (PP/316SS, EPDM
• details ); and Ozonated Water (up to 10 PPM, PVC, EPDM).Two cautions worth flagging: the gasket changes by chemical - oxidizers and strong acids su