The Norwesco 3725 gallon horizontal leg tank is a haul-class tank built for fertilizer, water, and agricultural transport on a nurse trailer or applicator skid. Molded in polyethylene with a 1.5 specific gravity rating, this Norwesco horizontal leg tank carries heavy contents while keeping a low center of gravity on the road. The tank holds 3,725 gallons; full of water it weighs about 31,066 lb, and Norwesco rates it for up to 46,600 lb of contents at its 1.5 SG ceiling. Those two numbers define your loading envelope: 31,066 lb is the water floor at full volume, and 46,600 lb is the hard ceiling. At a full 3,725 gallons, a 1.5-SG product is the heaviest this tank carries full; anything denser must run at partial fill or move to a 1.9-SG tank. Plan your trailer, axles, and payload against the 46,600 lb rated number, not the water figure.
Will it work for your job?
Use the rated 1.5 specific gravity as your hard limit, and treat resin as a prerequisite: the resin is recorded as HDLPE pending confirmation, so do not commit this tank to a chemical service contract until we confirm HDLPE versus XLPE in writing, because resin type materially changes both chemical compatibility and impact resistance. Size the load with the Tank Sizing Calculator and the Tank Sizing Guide so the filled weight matches your trailer and axle ratings. The current production tank was redrawn with revised end sumps for cleaner draining and outlet placement; confirm the sump and fitting layout against the technical drawing on this page before you plumb it. If you are spec'ing this for a DOT non-roadable trailer or applicator service, the Norwesco applicator and leg tank fertilizer guide walks the NRT scope, and the 49 CFR 173.5 agricultural exemption guide covers farm-fleet classification.
Chemical compatibility
This tank is polyethylene rated to 1.5 specific gravity. At that rating, the Norwesco chemical-resistance chart supports the following at the listed concentrations (always read the chart at your specific concentration and temperature): Acetic Acid 60% (PP/PVC fittings, details); Aluminum Sulfate 50% (PVC, details); Calcium Chloride 40% (PVC, details); DEF 32.5% (details); Ferrous Sulfate 20% (PVC, details); Magnesium Chloride 30% (PVC, details); Sodium Carbonate 30% (PVC, details); Urea Solution 50% (PP/PVC, details); and Ozonated Water up to 10 PPM (PVC). One convenience at this rating: every chemical compatible with the 1.5-SG tank seals on EPDM gaskets, so you can stock a single gasket type for the whole compatible set. The lone fitting exception is DEF: at 32.5%, use 316 stainless fittings, not steel or brass, since steel and galvanized hardware contaminate diesel exhaust fluid and put it out of ISO 22241 spec. That makes this tank a clean fit for fleet DEF storage and transfer when plumbed in 316SS.
Chemicals that need a higher-SG tank
Several products buyers ask about for this size class exceed the 1.5 SG rating and require a 1.9 specific gravity tank instead: Ethylene Glycol, Ferric Chloride, Ferric Sulfate, Hydrochloric Acid, Hydrofluoric Acid, Hydrofluosilicic Acid, Hydrogen Peroxide, Peracetic Acid, Phosphoric Acid, Polyaluminum Chloride, Potassium Carbonate, Potassium Hydroxide, Propylene Glycol, Sodium Bisulfate, Sodium Bisulfite, Sodium Hypochlorite, Sodium Thiosulfate, Sulfuric Acid, and Zinc Orthophosphate. The seal and fitting package changes too, so do not assume the EPDM/PVC kit carries over: the acids jump to Viton gaskets (Hydrochloric, Hydrofluoric, Hydrofluosilicic, Hydrogen Peroxide, Phosphoric, Sodium Hypochlorite, Sulfuric), Peracetic Acid steps up to Aflas, and Sulfuric Acid specifically calls for CPVC fittings. If your product is on this list, ask us about a 1.9 SG tank and the correct seal package before you order. See per-chemical pages such as sulfuric acid, sodium hypochlorite, and ethylene glycol, plus the full chemical compatibility reference.
Freight and ordering
This tank ships LTL freight, quoted live to your ZIP from the nearest Norwesco plant: Fairfield, TX; Shawnee, OK; or St. Bonifacius, MN. Because the shell is large and the loaded weight is substantial, run your ZIP through the Freight Cost Estimator for an accurate freight cost, or call 866-418-1777 and we will route from the closest origin. The biggest mistakes to avoid on a tank this size are loading a product heavier than 1.5 SG, skipping the HDLPE-versus-XLPE resin confirmation before chemical service, and planning transport around the water weight instead of the 46,600 lb rated contents number. Call 866-418-1777 with your product, concentration, and destination ZIP and we will confirm the right fitting and gasket package and freight before you buy.
