Snyder Industries 6500 Gallon Plastic Vertical Double Wall Liquid Chemical Storage Tank

A tanker and a reserve, contained

A tanker compartment is about 5,000 gallons, and a tank sized only to that is empty on delivery day, which is the day something goes wrong; 6,500 gallons takes the load with a reserve still in the bottom. A single wall tank of that chemical needs a berm sized to its volume, a concrete basin with a sump and a drain valve that must stay closed; a double wall tank carries its containment inside the outer shell, so the 120 inch footprint is the whole footprint, and the SPCC 40 CFR 112 compliance walkthrough covers where that satisfies a spill plan on its own. A tank's specific gravity rating is the density of the heaviest liquid its wall is sized to hold; alum and ferric solutions, brines and most caustic and hypochlorite as delivered are all lighter than a 1.5 wall is sized for. The rated chemistry for the resin is listed below; check the liquid at its concentration in the chemical compatibility database, and work out the usable volume with the Captor double wall freeboard sizing guide. The tank sizing calculator matches the volume to feed rate and delivery interval, and the tank sizing guide covers the reserve.

Grades on the 120 x 199 inch double wall, and the sizes beside it

The N40 is cross-linked polyethylene for oxidizers at this tank's weight; the N30 is the sulfuric acid grade and the N42 the heavy-wall cross-linked tank, both 1,300 pounds heavier. The 5660000N43 is the 5,500 gallon double wall in this same grade, 27 inches shorter on the same base, and the 1006400N46 holds 8,700 gallons on a 142 inch base at nearly this height.

Want us to check the fit? Send the site dimensions to 866-418-1777 or through a written quote request and we will confirm the tank, the pad and the freight.

Openings, alarms and the interstice

• Access: 18 inch threaded, vented manway on the primary, 199 inches up; on caustic or hypochlorite the vent goes outdoors, the fill goes down a dip tube, and the vent is sized to the tanker pump.
• Outlet: through both walls as one penetration, flanged, with an expansion joint and the valve carried off the slab; order the fitting in the material the chemical calls for.
• Service limit: 120 F / 48 C.

There are two levels to watch: the primary, with a sender chosen for the chemical per the level gauge selection guide, and the space between the walls, which serves as the leak alarm and gets a switch, a shift check at the port, and a weekly log entry. The tanker connection is where an overfill starts; the tank spillover redundancy guide walks through the alarm and cutoff layers that stop an overfill upstream of the interstice. Full, the tank loads a 120 inch circle to 81,315 pounds at the rating: an engineered slab bearing under the entire floor, the empty tank strapped down against wind, and at 199 inches nobody reaches the manway from a ladder; it gets a fixed platform with a rail.

Receiving a tanker

The driver's pump can deliver faster than the manway vent can breathe, so the vent is sized for the unload rate or the fill goes through a dedicated top bulkhead with its own vent line. The fill pipe runs to the floor so coagulant or caustic does not free-fall and foam. The first delivery into a new tank is watched from start to finish, with the slab edge, the outlet fitting and the interstitial port checked as the level climbs, and each delivery after it is logged with its date and strength.

Typical duty

Coagulant, caustic, brine and hypochlorite bulk storage at water and wastewater plants that cannot build a berm, chemical storage inside tall process buildings, and any regulated liquid of moderate density at plant scale at a site an inspector visits. One chemical to a tank, a label both inspectors can read, and the manway kept closed against vapor loss.

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.

• Acetic Acid at 60% (PP/PVC fittings, EPDM gaskets)
• Aluminum Sulfate at 50% (PVC, EPDM)
• Calcium Chloride at 40% (PVC, EPDM)
• DEF at 32.5% (316SS fittings, EPDM)
• Ferrous Sulfate at 20% (PVC, EPDM)
• Magnesium Chloride at 30% (PVC, EPDM)
• Sodium Carbonate at 30% (PVC, EPDM)
• Urea Solution at 50% (PP/PVC, EPDM), and Ozonated Water up to 10 PPM (PVC, EPDM).Browse the full
• Sulfuric Acid (CPVC fittings, Viton gaskets)
• Hydrochloric Acid (PVC, Viton)
• Sodium Hypochlorite (PVC, Viton)
• Hydrogen Peroxide (PVC, Viton)
• Ferric Chloride (PVC, EPDM)
• Ferric Sulfate (PVC, EPDM)
• Phosphoric Acid (PVC, Viton)
• Polyaluminum Chloride (PVC, EPDM)
• Ethylene Glycol (PVC, EPDM)
• Propylene Glycol (PP/316SS, EPDM)
• Potassium Hydroxide (PVC, EPDM)
• Potassium Carbonate (PVC, EPDM)
• Sodium Bisulfate (PVC/PP, EPDM)
• Sodium Bisulfite (PVC/PP, EPDM)
• Sodium Thiosulfate (PVC, EPDM)
• Hydrofluoric Acid (PP/PVC, Viton)
• Hydrofluosilicic Acid (PP/PVC, Viton)
• Peracetic Acid (316SS, Aflas), and
• Zinc Orthophosphate (PP/316SS, EPDM) call for a 1.5 specific gravity tank, not this one.If your product is on that list, call 866-418-1777 for the 1.9 specific

Freight to your ZIP

At 120 inches across and 199 inches long on the deck the 5670000N43 is oversize freight (NMFC 156600) on a flatbed at a lane rate; the freight cost estimator gives the flatbed number for your ZIP, and the listed price is before freight. A crane sets 4,000 pounds upright on the slab; a forklift can unload it but not stand it. Water-test the primary and hold it long enough to prove the interstice stays dry, then drain and dry the tank before the first delivery. A photo of the tank on its pad, full, on day one is worth keeping; it is the baseline every later inspection is compared against.