Snyder Industries 405 Gallon HDLPE Vertical Double Wall Liquid Chemical Storage Tank with ASTM Certification

Certified, contained, on four square feet

The certification is against ASTM D1998, the standard rotationally molded polyethylene tanks are specified to, and the way a tank meets it is in the wall; the HDPE tank wall thickness guide explains how D1998 sizes the wall and why tanks fail above the liquid line. The double wall catches a leak in the interstitial space instead of on the floor, so the tank needs no spill pallet and no berm; the SPCC 40 CFR 112 compliance walkthrough covers where a double wall tank satisfies a spill plan on its own, and the Captor double wall freeboard sizing guide works out the usable volume once thermal expansion and the interstice are accounted for. The rated chemistry for the resin is listed below; check the liquid at its concentration in the chemical compatibility database. The tank sizing calculator sizes the tank to feed rate and delivery interval, and the tank sizing guide covers the reserve.

Grades on the 48 x 73 inch double wall, and the sizes beside it

The N30 is the sulfuric acid grade, the N42 is cross-linked polyethylene for oxidizers, and the N48 is another linear grade, all at the same weight in the same shell. The 5760102N45 lays 360 gallons down to 63 inches on a 53 inch base for a low ceiling, and the 5780102N42 is the cross-linked 500 gallon double wall, 8 inches taller on a 53 inch base.

Settled on the 405 gallon tank? Freight to your ZIP and add to cart above; a written quote is one click away for the paperwork.

Openings, and the second wall's job

• Access: 18 inch threaded, vented manway on the primary, 73 inches up; filled through a dip tube from a hose or tote pump, with the vent run outdoors when the liquid fumes.
• Outlet: one penetration through both walls, the transition on its own support; order the fitting in the material the chemical calls for.
• Service limit: 120 F / 48 C.
• Listing: ASTM certification.

Two levels to watch: the primary, with a sender chosen for the chemical per the level gauge selection guide, and the interstitial space, which is the leak alarm and gets a float switch, a look into the port each shift, and a logged check each week. A wet interstice is a failed primary, and the tank is drained the same day. Strap it to a wall; a 48 inch base under 73 inches of dense liquid has a high center of gravity, and full it puts 6,418 pounds on that circle at the rating, which a slab in full contact carries. Mount the dosing pump below the outlet so it primes by gravity, and route the vent away from the pump's electrical gear.

Jobs it is bought for

Coagulant, caustic and acid day tanks at water and wastewater plants that need the certification on file, chemical feed inside occupied buildings, polymer make-down on a skid, and any 405 gallon vessel of regulated chemical at a site an inspector visits. Give it one chemical and a label, and keep the manway closed so nothing leaves as vapor.

Chemical service ratings

The resin is rated for the liquids below at the concentrations shown; the fitting and gasket called out are the ones to order with the tank. Verify the exact service on the linked page or in the chemical compatibility database before ordering.

• Sulfuric Acid at 98% (CPVC fittings, Viton gasket)
• Hydrochloric Acid at 37% (PVC fittings, Viton gasket)
• Phosphoric Acid at 85% (PVC fittings, Viton gasket)
• Hydrofluoric Acid at 48% (PP/PVC fittings, Viton gasket)
• Sodium Hypochlorite at
• Hydrogen Peroxide at 50% (PVC fittings, Viton gasket)
• Ferric Chloride at 50% (PVC fittings, EPDM gasket)
• Aluminum Sulfate at 50% (PVC fittings, EPDM gasket)
• Potassium Hydroxide at saturated (PVC fittings, EPDM gasket)
• DEF at 32.5% (316SS fittings, EPDM gasket)
• Urea Solution at 50% (PP/PVC fittings, EPDM gasket)
• Peracetic Acid at 30% (316SS fittings, Aflas gasket)
• Acetic Acid at 60% (PP/PVC fittings, EPDM gasket)
• Calcium Chloride at 40% (PVC fittings, EPDM gasket)
• Ethylene Glycol at 100% (PVC fittings, EPDM gasket)
• Ferric Sulfate at 60%
• Ferrous Sulfate at 20%
• Magnesium Chloride at 30%
• Sodium Carbonate at 30%
• Potassium Carbonate at 50%
• Sodium Thiosulfate at 40% (all PVC fittings, EPDM gasket)
• Hydrofluosilicic Acid at 26% (PP/PVC fittings, Viton gasket)
• Polyaluminum Chloride (PVC fittings, EPDM gasket)
• Sodium Bisulfate and
• Sodium Bisulfite (PVC/PP fittings, EPDM gasket)
• Propylene Glycol and
• Zinc Orthophosphate (PP/316SS fittings, EPDM gasket)

What the carrier needs from you

The 5990702N45 ships palletized as LTL freight (NMFC 156600-03) at a class rate; the freight cost estimator gives the number for your ZIP; the price shown here is before freight. A pallet jack moves 250 pounds. Water-test the primary, confirm the interstice stays dry through the hold, then drain and dry before the first chemical fill, and keep the certification paperwork with the project file. Note the pad height and the outlet height on the site plan while the tape is out; the next pipe run will need both.