Snyder Industries 16500 Gallon HDPE Vertical Liquid Storage Tank

The full-density wall at the top of the twelve foot family

A 1.9 specific gravity wall is sized for a liquid nearly twice as dense as water, and 5,100 pounds of resin is what that takes at 16,500 gallons, the tallest tank Snyder puts on a 142 inch base. The wall is sized under ASTM D1998; the HDPE tank wall thickness guide explains that logic and why a wall this tall is inspected from the top, in the headspace. Full, it puts 261,459 pounds on a 142 inch circle at the rating: an engineered slab in full contact under the entire floor, per the concrete pad sizing guide, screeded flat, inside a berm sized to the tank, with the empty tank strapped against wind and the manway reached from a fixed platform on its own footings. 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 142 x 257 inch tank, and the sizes beside it

The N45 is this same 1.9 wall with ASTM certification, 500 pounds heavier, and the N43 is the certified 1.5 wall at this tank's weight; the C37-BLACK is the black water tank in this shell, and the C126 is the light-wall water tank at 3,000 pounds. The 3030100C26 holds 15,000 gallons on a 165 inch base 73 inches shorter, and the 3030000N49 holds 18,800 gallons on that base at 242 inches.

Comparing across brands too? Call 866-418-1777; we carry Norwesco, Snyder, Chem-Tainer, Enduraplas and Bushman and will say which one fits, or price the freight first.

Bulkheads and lid

• Access: 18 inch threaded, vented manway, 257 inches up; vent outside on acid and caustic service, fill through a dip tube, and size the vent for a tanker's unload rate.
• Outlet: name the chemical when ordering so the bulkhead fitting matches it; a flanged transition, an expansion joint, and a valve supported off the slab.
• Service limit: 120 F / 48 C.

Choose the level sender for the chemical and read it at ground level so nobody climbs for a number; keep the manway closed against vapor loss, and shade the tank where the chemical is light-sensitive. A single wall tank of regulated chemical stands inside a berm sized to it. Where it freezes, insulate or drain the outlet valve and the first length of pipe; with this much water in it the body freezes from the top, slowly, without harm.

The tanker unload

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. A fill pipe to the floor keeps the liquid from free-falling and foaming. If the tank is ever used to dilute a batch, water goes in first and the chemical second; the other order boils. The first delivery into a new tank is watched from start to finish, with the slab edge and the outlet fitting checked as the level climbs, and the log takes the date and strength of every load that follows; the log is the inventory at this scale.

Day-to-day duty

Ferric and other dense coagulants at a large plant with a berm, heavy brine at plant scale, dense process chemicals delivered by tanker, and water where the buyer wants the heaviest wall for a long life outdoors, including a fire reserve of the kind the fire-water reservoir design guide describes, or the storage stage of a reuse system per the industrial water reuse tank topology article. One liquid per tank, labeled.

From the plant to your site

At 142 inches across and 257 inches long on the deck the 5380000C26 is oversize freight (NMFC 156600) on a flatbed at a lane rate, with an escort on most routes; the freight cost estimator quotes the haul to your ZIP; what is listed is the price before freight. A crane sets 5,100 pounds upright on the slab. Water-fill it once to the manway, hold it, and check the outlet fitting before the first chemical delivery. Write the fill date on the manway with a paint marker; it answers the first question anyone asks about a tank.