Snyder Industries 5500 Gallon Plastic Vertical Double Wall Liquid Chemical Storage Tank in White (1.5 SG)

Containment that ships on the truck, under a lower roof

Put a regulated chemical in a single wall tank and the berm has to hold all of it, and at 5,500 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 120 inch footprint is the whole footprint; the SPCC 40 CFR 112 compliance walkthrough walks through when a double wall tank stands in for a berm under a spill plan. A tank's specific gravity rating is the density of the heaviest liquid its wall is sized to hold; a 1.5 wall covers alum, ferric, brine, caustic and hypochlorite as delivered with room to spare; the 1.9 wall is for concentrated sulfuric acid and nothing lighter needs it. Below is the resin's rated chemistry; 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 sizes the tank from feed rate and delivery interval; the tank sizing guide covers the reserve.

Grades on the 120 x 172 inch double wall, and the sizes beside it

The N40 is cross-linked polyethylene for oxidizers and the N46 another linear grade, both 200 pounds heavier; the N42 is the heavy-wall cross-linked tank at 3,800 pounds. The 5630000N40 stands 5,000 gallons on a 102 inch base 44 inches taller, and the 5670000N30 is the 6,500 gallon sulfuric-grade step up on this same base at 199 inches. The 7000000N43 is the single wall on this base for a site that already has a berm.

Picked the 5500 gallon tank? Add it to your cart above; freight is quoted to your ZIP before you pay anything.

Where the pipe goes, and the two alarms

• Access: 18 inch threaded, vented manway on the primary, 172 inches up; vent outside on caustic and hypochlorite service, fill through a dip tube, and size the vent for a tanker's unload rate.
• Outlet: through both walls together, with a flanged transition, an expansion joint, and a valve supported off the slab; tell us the chemical and the fitting is matched to it.
• Service limit: 120 F / 48 C.

Two levels need watching: the primary, with a sender chosen for the chemical per the level gauge selection guide, and the interstice, which is the alarm: a float or conductivity switch, a look through the port each shift, a logged check each week. Overfills happen on delivery day, at the tanker; the tank spillover redundancy guide sets out the high-level alarm and the automatic cutoff that end a fill before the second wall is ever tested. Full, the tank loads a 120 inch circle to 68,805 pounds at the rating: an engineered, full-contact slab under all of the floor, with straps holding the empty tank against wind, and the manway reached from a fixed platform with a rail.

Taking a tanker load

A tanker unloads faster than the manway can breathe, so the vent is sized for the pump or the fill takes a dedicated top bulkhead with its own vent. Run the fill pipe to the floor so coagulant or caustic does not free-fall and foam. Somebody stands at the tank for the whole of the first delivery, checking the slab edge, the outlet fitting and the interstitial port as the level rises, and every delivery after that goes in the log with a date and a strength.

Who buys this tank

Coagulant, caustic, brine and hypochlorite bulk storage at water and wastewater plants that cannot build a berm, chemical storage inside buildings with a lower roof than a tall double wall allows, and any regulated liquid of moderate density at plant scale at a site an inspector visits. One chemical per tank, labeled for both inspectors at once, manway closed against vapor loss.

What this tank is listed to hold

Each line is a liquid the resin is rated for, at the concentration shown, with the fitting and gasket to order. Follow the link for the full rating, or search 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, EPDM)
• Ferrous Sulfate at 20% (PVC, EPDM)
• Magnesium Chloride at 30% (PVC, EPDM)
• Sodium Carbonate at 30% (PVC, EPDM); and
• Urea Solution at 50% (PP/PVC, EPDM). Ozonated Water up to 10 PPM (PVC, EPDM) is also compatible, but it has no compatibility page yet, so confirm it agai
• 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. Watch the gasket and fitting changes on the aggressive ones: sodium hypochlorite, hydrochloric, hydrofluoric, phosphoric, sulfuric, and h

Delivery day

At 120 inches across and 172 inches long on the deck the 5660000N43 is oversize freight (NMFC 156600) on a flatbed at a lane rate; the freight cost estimator prices the lane to your ZIP; the figure listed here is before freight. A crane sets 3,000 pounds upright on the slab; a forklift unloads it; only a crane stands it. Fill the primary with water, hold it, and watch the interstice stay dry; then drain and dry it before the chemical arrives. Keep the delivery paperwork with the tank; the serial number on the shell is what a warranty claim starts from.