Snyder Industries 4500 GALLON PLASTIC VERTICAL LIQUID STORAGE TANK 1.5 SG

A tanker load with the outlet already in

A water-rated wall is for water and nothing heavier; the chemical-grade wall is for concentrated acid; a 1.5 wall is the middle, sized for brine, fertilizer solution and coagulant as delivered and every water application, with margin. Rotationally molded polyethylene tanks are sized to ASTM D1998, and the way a tank meets the density it is rated for is in the wall; the HDPE tank wall thickness guide explains the sizing logic and why the headspace is where a wall ages. Full, it puts 56,295 pounds on a 102 inch circle at the rating: a slab designed for the load and in contact with the whole floor, as the concrete pad sizing guide, wind straps on the tank while it is empty, and the manway reached from a fixed platform. The tank sizing calculator tells you whether 4,500 gallons covers the draw, and the tank sizing guide covers days of supply.

The two 7420000 tanks, and the sizes beside them

The 7420000C26 is the same shell and fitting rated on the sheet for 1.9, for ferric at strength and the heavy brines. The 7000400 tanks lay the same 4,500 gallons down to 91 inches on a 143 inch base for a barn roof, the 5210000N40 stands 4,400 gallons of cross-linked resin on a 90 inch base at 182 inches, and the 7000500N40 puts 4,600 on a ten foot base under ten feet.

Other makers in the running? 866-418-1777 will compare them honestly; Norwesco, Snyder, Chem-Tainer, Enduraplas and Bushman are all here, or price freight on this one.

Openings as shipped

• Outlet: 3 inch polypropylene female NPT bulkhead fitting, installed; thread in a valve, run a flexible connector and an expansion joint to hard pipe, and support the valve off the slab.
• Access: 18 inch threaded, vented manway, 142 inches up; filled by truck through a dip tube, vented outside on anything that fumes, and size the vent for a tanker's unload rate.
• Service limit: 120 F / 48 C.

Polypropylene is the fitting for water, brine and most treatment chemicals; check the liquid at its concentration against the fitting as well as the wall before the first fill. The white wall shows the level in daylight; fit a sender read at ground level so nobody climbs for a number, and fit a low-level float switch so a pump never runs dry. Put the pump below the outlet, where it primes itself, close the manway against vapor loss, and keep a light-sensitive liquid out of direct sun. In a freezing climate insulate or drain the outlet valve and the first run of pipe.

Unloading without a spill

The truck's pump outruns the manway vent, so size the vent for the unload rate or give the fill its own top bulkhead and vent line. The fill pipe reaches the floor, so the liquid enters below the surface instead of free-falling and foaming. 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 from then on each load is logged by date and strength.

In service

Coagulant, brine and fertilizer solution delivered by tanker at plants and farms, well storage for a community system, a rain cistern under a large roof, and a fire reserve of the kind the fire-water reservoir design guide describes, where the 3 inch outlet feeds the pump. Several of them are the storage stage of a reuse system for roof water and condensate, per the industrial water reuse tank topology article. One liquid per tank, labeled.

Freight and unloading

At 102 inches across and 142 inches long on the deck the 7420000C37 is oversize freight (NMFC 156600) on a flatbed at a lane rate; the freight cost estimator prices the move to your ZIP, and the price on this page is before freight. A forklift with long forks or a small crane sets 900 pounds on the slab. Fill it to the manway once, hold it, and check the fitting for a weep before the pump goes on. The first fill is the only cheap time to find a problem, so do it in daylight with someone watching the base.