Snyder Industries 1685 Gallon Plastic Horizontal Leg Tank with Securing Hoops

The narrow body in the 1685 pair

Two tanks on this sheet hold 1685 gallons and they are the same length, the same height and the same weight: 159 inches long, 62 inches tall, 480 pounds empty. Width is the entire decision, and this is the 48 inch one. Four feet across the body is what lets a tank this long sit down between frame rails, ride on a narrow skid, or run along one side of a flatbed with a walkway left beside it, where the 62 inch body takes the whole deck. Narrow also means the liquid stands deeper for the same gallons, so the hoop bands do more work and the legs carry a taller column over less footprint. Mount it accordingly. The legs want continuous bearing along their whole length, which means a deck, a pair of skid rails running the full 159 inches, or a flat pad, never a pair of blocks under the ends. The hoops are what a strap goes over, and a ratchet strap pulled across bare wall between the hoops is how a polyethylene body gets creased. A horizontal tank with no baffle in it moves its load every time the vehicle does, and 14053 pounds of water sloshing in a 48 inch wide body is a rolling moment, not a dead weight, so haul it full or haul it empty and keep the straps tight either way. Check the volume against the duty before you buy the shape: 1685 gallons against your fill rate and your turnaround in the tank sizing calculator, and the reserve you never draw plus the room a warming liquid needs in the tank sizing guide.

Two 1685s, one length, two widths

Take this one over its own twin when the space you have is long and narrow. The SII-1460000N45 is the same 159 inch length and the same 62 inch height at the same 480 pounds with a 62 inch body, which is the buy when the deck is wide and you would rather have the load sitting lower and broader; it also lists a smaller outlet than the 3 inches on this sheet, so the two are not interchangeable at the plumbing either. The 1650 gallon SII-1000700C26 gives up a few dozen gallons and better than a foot of length for a 71 inch body only 55 inches tall, and is listed heavier at 533 pounds, which is the trade when height is the constraint and length is scarce. The 2000 gallon SII-1002300C37 is the same 142 inch length in an 84 inch wide, 55 inch tall body at 700 pounds, for a pad or a trailer that has the width to spare and wants the extra volume. Among the four, this is the only one that combines the full 159 inches of length with a four foot body and a 3 inch outlet.

Need the taller or the wider one? Every row links to its page with freight to your ZIP on each; 866-418-1777 will check the ceiling and the pad.

An 18 inch lid with no vent on the sheet

• Air first: the sheet names an 18 inch lid and says nothing about a vent in it, so do not assume one. A tank drawn down hard through a 3 inch outlet with a sealed lid pulls a vacuum on itself, and polyethylene answers a vacuum by deforming. Confirm the lid you are ordering is vented, or fit a breather sized to the transfer rate you actually pump, and keep the screen in it clear.
• Headspace: 1685 gallons is the rated volume and the sheet publishes no separate fill line, so leave the liquid room to warm and expand under the lid rather than filling to the rim of an 18 inch opening. On a tank 48 inches wide the surface is small for the volume, so a little expansion moves the level a long way.
• Outlet: one 3 inch outlet, as the sheet lists it, and no inlet is listed at all. Three inches is generous on a tank this size and it is the reason to buy this one: it empties a long body without the last third crawling, and it lets a transfer pump stay flooded. Plumb it low, break the first joint with a flexible connector, and carry the first valve on its own support off the deck rather than on the tank.
• Fill: with no inlet on the sheet, the 18 inch lid is the fill point. Fill down a tube to the floor instead of free-falling into the body, and have the truck driver watch the level rather than the clock.
• Limits: 120 F / 48 C is the service limit on the sheet, and the wall is rated to a specific gravity of 1.9, which is 26701 pounds of contents. The sheet publishes no warranty term.

What kills a leg tank is never the volume, it is the connection. On a vehicle the outlet and its valve are the lowest, most exposed things on the load, so put them inboard of the frame, guard them from a trailer tongue and a loading ramp, and check the fitting after the first loaded mile and again after the first hard stop. On a pad, keep a wrench path clear around the fitting and keep it out of a buried box. Where winter bites, trace or insulate the valve and the exposed run and leave the body alone; a plastic valve full of ice is scrap.

Nurse duty, skid duty and blended fertilizer

A narrow 1685 is bought to travel or to tuck in. It rides as a nurse tank behind a sprayer, it sits on a skid at the end of a field road, it goes on a service truck for water or a single process liquid, and it stands on a pad where a wide tank would block an aisle. Where the load is a blended fertilizer, the thing that ruins a season is not the tank, it is a stratified load going out of spec in the spreader, and the physics and the field checks that catch it are in the fertilizer blend stratification guide. Before you mount one on anything with wheels, read what the rules say about hauling liquid on a farm trailer rather than assuming: the applicator and leg tank scope article covers the non-roadable trailer question, and the portable utility tank classification article works through the agricultural exemption at 49 CFR 173.5 for a farm fleet. Where the site needs a second wall under the liquid rather than a strap over it, the double wall walkthrough for 40 CFR 112 is the honest comparison between a contained vessel and a single wall on a bermed pad.

Resin compatibility, line by line

Below are the liquids this resin is rated for, the concentration each rating holds to, and the fitting and gasket to specify. Check the exact concentration and temperature you run against the chemical page or the chemical compatibility database before ordering.

• Acetic Acid (60%, PP/PVC fittings, EPDM gaskets)
• Aluminum Sulfate (50%, PVC, EPDM)
• Calcium Chloride (40%, PVC, EPDM)
• DEF (32.5%, 316SS, EPDM)
• Ethylene Glycol (100%, PVC, EPDM)
• Ferric Chloride (50%, PVC, EPDM)
• Ferric Sulfate (60%, PVC, EPDM)
• Ferrous Sulfate (20%, PVC, EPDM)
• Hydrochloric Acid (37%, PVC, Viton)
• Hydrofluoric Acid (48%, PP/PVC, Viton)
• Hydrofluosilicic Acid (26%, PP/PVC, Viton)
• Hydrogen Peroxide (50%, PVC, Viton)
• Magnesium Chloride (30%, PVC, EPDM)
• Peracetic Acid (30%, 316SS, Aflas)
• Phosphoric Acid (85%, PVC, Viton)
• Potassium Carbonate (50%, PVC, EPDM)
• Potassium Hydroxide (saturated, PVC, EPDM)
• Sodium Carbonate (30%, PVC, EPDM)
• Sodium Hypochlorite (under 16.5%, PVC, Viton)
• Sodium Thiosulfate (40%, PVC, EPDM)
• Sulfuric Acid (98%, CPVC, Viton)
• Urea Solution (50%, PP/PVC, EPDM), and Ozonated Water (up to 10 PPM, PVC, EPDM). A further group is referenced without a concentration in our record.
• Polyaluminum Chloride (PVC, EPDM)
• Propylene Glycol (PP/316SS, EPDM)
• Sodium Bisulfate (PVC/PP, EPDM)
• Sodium Bisulfite (PVC/PP, EPDM), and
• Zinc Orthophosphate (PP/316SS, EPDM). See the full

Lincoln to the yard as an oversize load

The SII-1460000C26 is molded at Lincoln, Nebraska, and the sheet gives the freight class as OVS with NMFC 156600, which is to say it moves as an oversize load rather than as a rate off a table. Thirteen feet of tank is a length problem before it is a weight problem, so 480 pounds is the easy part: the hard part is where the truck stops, whether the gate is wider than the shipment and whether anything can reach over a load that long to lift it. The freight cost estimator prices the lane to your ZIP, and the listed price is before freight. Take it off with slings under the body between the legs and the hoops, never a hook through the lid, and set it on the finished skid or pad rather than on the ground beside it. Then fill it with water once, on the mount it will live on, and walk the full 159 inches of it looking at every leg and the outlet fitting before a single gallon of product goes in. A leg tank that is square on its rails on day one stays square; one set down twisted will tell you about it for years. A strap that is checked once a season is a strap that holds; put it on the same calendar as the gutters.