The Norwesco 1635 Gallon Horizontal Elliptical Leg Tank is built for moving liquid, not just storing it. Molded in black high-density linear polyethylene with a 1.9 specific gravity rating, this horizontal leg tank carries the full elliptical cross-section that lets it ride low and stable on a trailer or skid. It measures 142 inches long by 71 inches wide by 58 inches high, and the integral legs hold the elliptical body upright so the load sits where you want it. If you are sourcing a Norwesco HDPE horizontal leg tank in black for ag transport or chemical haul work, this is the 1635-gallon size.
Will it work for your load?
The 1.9 specific gravity rating is the number that matters here. It means the tank wall is engineered to carry contents up to 1.9 times the weight of water, so a full 1635 gallons of plain water weighs about 13,636 pounds, and the tank is rated to hold contents up to roughly 25,908 pounds at the 1.9 limit. A 50% urea solution or a typical liquid fertilizer sits well under that 1.9 ceiling, so you can self-check your fill weight before you quote freight. At 1.9 specific gravity this is the heaviest-rated density class offered in this tank line, so if you are hauling something denser than 1.9 times water, stop and call before you fill. The footprint is 71 by 142 inches, so confirm your trailer deck or containment pad can take that span before you commit. Use the Tank Sizing Calculator and the Tank Sizing Guide to match capacity and weight to your application.
Chemical compatibility
This tank is molded in HDLPE and rated to 1.9 specific gravity, which is why it handles a wide band of agricultural and water-treatment chemicals. It ships without fittings installed, so specify your bulkhead, valve, and gasket materials per the compatibility table below to suit the chemistry you are running. The list is drawn from the manufacturer chemical-resistance chart and is concentration- and temperature-specific, so verify your exact service conditions against that chart and our chemical compatibility guide before filling.
Compatible chemicals at the listed concentrations include 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), polyaluminum chloride (PVC, EPDM), potassium carbonate (50%, PVC, EPDM), potassium hydroxide (saturated, PVC, EPDM), propylene glycol (PP/316SS, EPDM), sodium bisulfate (PVC/PP, EPDM), sodium bisulfite (PVC/PP, 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), zinc orthophosphate (PP/316SS, EPDM), and ozonated water (up to 10 PPM, PVC, EPDM).
The mistake to avoid
Match the fitting and gasket to the chemical, not to the tank. The HDLPE shell takes everything on the list above at the 1.9 specific gravity rating, but the bulkheads, valves, and gaskets are where loads fail. Most salts and glycols run fine on PVC fittings with EPDM gaskets, but three groups need closer attention: the strong oxidizers and acids that call for Viton gaskets (hydrochloric 37%, hydrofluoric 48%, hydrofluosilicic 26%, hydrogen peroxide 50%, phosphoric 85%, sodium hypochlorite under 16.5%, sulfuric 98%); the chemicals that want 316 stainless hardware (DEF 32.5%, peracetic acid, plus PP/316SS for propylene glycol and zinc orthophosphate); and peracetic acid, the lone case that needs an Aflas gasket rather than Viton or EPDM. If you are blending or hauling fertilizer, read up on fertilizer-blend tank stratification so a dense layer does not catch you off guard, and our HDPE color pigment chemistry guide explains why the black carbon-black pigment adds UV protection for outdoor use. For DOT and trailer-use questions on leg and applicator tanks, see our guide to Norwesco applicator and leg tanks for fertilizer.
This tank ships LTL freight from the nearest Norwesco plant in our network, which includes Fairfield, TX; Griffin, GA; Hanford, CA; Lancaster, OH; Shawnee, OK; St. Bonifacius, MN; and Tooele, UT. Freight is quoted live to your ZIP code, so enter it in the Freight Cost Estimator for a delivered freight rate, or call us at 866-418-1777 and we will route it from the closest plant to keep the freight down.
