Snyder Industries 4000 Gallon HDLPE Vertical Double Wall Liquid Chemical Storage Tank (1.5 SG)

Buying the wall the liquid needs

A tank's specific gravity rating is the density of the heaviest liquid its wall is sized to hold for its service life; everything a water plant stores short of concentrated acid sits below what a 1.5 wall is sized for, so this grade carries those liquids with margin at a lower price than the 1.9 wall. 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 double wall keeps its containment inside the outer shell, so the 102 inch footprint is all the room it needs; the SPCC 40 CFR 112 compliance walkthrough covers where that satisfies a spill plan on its own. The tank sizing calculator sizes the tank from feed rate and delivery interval; the tank sizing guide covers the reserve; 4,000 gallons takes most of a tanker compartment.

Grades on the 102 x 178 inch double wall, and the sizes beside it

The N45 is the 1.9 wall in linear resin and the N30 is the sulfuric acid grade, both 800 pounds heavier; the N40 is cross-linked polyethylene for oxidizers at this tank's weight. The 5600000N30 is the 3,500 gallon double wall, 20 inches shorter on the same base, and the 5620000N30 is the 4,500 gallon step up at 197 inches. Every one stands on the same 102 inch circle, so the slab outlives the tank size.

Comparing against another maker? Send the competing spec to 866-418-1777 or a quote request and we will show the differences honestly.

What is fitted, what alarms, what is watched

• Access: 18 inch threaded, vented manway on the primary, 178 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.

Watch two levels: 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 102 inch circle to 50,040 pounds at the rating: an engineered slab in full contact under the whole floor, with the empty tank strapped against wind, and at 178 inches the manway is reached from a fixed platform.

Bringing in a 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. The fill pipe reaches the floor, so coagulant or caustic enters below the surface instead of free-falling and foaming. 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, and from then on each load is logged by date and strength.

The work it does

Coagulant, caustic, brine and hypochlorite bulk storage at water and wastewater plants that cannot build a berm, chemical storage inside occupied buildings, 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.

Compatibility list

Liquids the maker rates this resin for, with concentration limits and the wetted fitting and gasket to specify. Confirm your own concentration and temperature on the chemical page or in the chemical compatibility database before ordering.

• Acetic Acid at 60% - PP/PVC fittings, EPDM gaskets
• Aluminum Sulfate at 50% - PVC fittings, EPDM gaskets
• Calcium Chloride at 40% - PVC fittings, EPDM gaskets
• DEF at 32.5% - 316SS fittings, EPDM gaskets
• Ferrous Sulfate at 20% - PVC fittings, EPDM gaskets
• Magnesium Chloride at 30% - PVC fittings, EPDM gaskets
• Sodium Carbonate at 30% - PVC fittings, EPDM gaskets
• Urea Solution at 50% - PP/PVC fittings, EPDM gaskets
• Sulfuric Acid calls for CPVC fittings with Viton gaskets
• Sodium Hypochlorite
• Hydrochloric Acid
• Phosphoric Acid and
• Hydrogen Peroxide all need Viton gaskets, and
• Peracetic Acid needs 316SS fittings with Aflas gaskets.Others on the 1.5 SG list include
• Ferric Chloride
• Ethylene Glycol and
• Potassium Hydroxide .If your chemistry is on that list, size up to the 1.9 SG version and re-spec the fittings and gaskets to match.Always confirm your specifi

Freight, in plain terms

At 102 inches across and 178 inches long on the deck the 5610000N43 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 or a forklift with long forks sets 2,400 pounds on the slab. Fill the primary with water, hold it, and watch the interstice stay dry; then drain and dry it before the chemical arrives. Save the pallet; a tank that ever has to move again is easier to move on it.