The Norwesco 4200 Gallon Hauling Flat Bottom Utility Tank (SKU N-44972) is a White polyethylene bulk-hauling and storage tank rated to a 1.5 specific gravity, which means its wall is built to carry contents heavier than water without exceeding the resin's design margin. At 4,200 gallons it is a large single-vessel flat-bottom utility tank, and its flat base lets it sit on a fully supported pad or a hauling skid rather than needing a contoured cradle.
Will it work for your job
The tank measures 85 in high, 96 in wide, and 180 in long, giving a footprint of 96.0 x 180.0 inches. That long, low flat-bottom geometry is what separates a hauling tank from a tall vertical: more capacity sits closer to the ground, lowering the center of gravity for transport and reducing the pad height you have to build. The 1.5 specific gravity rating is the number that matters most before you fill it. Plain water fills this tank to 35,028 lb, which works out to 8.34 lb per gallon, while the wall is engineered to carry contents up to 52,542 lb at the full 1.5 SG rating — about 12.5 lb per gallon, or 1.5 times the weight of water. Read that as a fill rule: a product heavier than water hits the 52,542 lb weight ceiling before the tank is full, so you fill to volume or to weight, whichever comes first. Stay at or under that rated weight, and confirm your pad, trailer, or hauling frame is rated for whatever portion of it you intend to move. Use the Tank Sizing Calculator and the Tank Sizing Guide to match the 4,200-gallon working volume to your draw rate and refill cycle. See the technical drawing on this page for the outlet, fill, and vent layout before you plumb it.
Set it on the right foundation
A flat-bottom tank this size transfers its entire loaded weight straight down through the base, so the surface under it has to be flat, continuous, and rated for the full contents weight. For a permanent above-ground install, our guide on concrete pad sizing for above-ground polyethylene tanks walks through the ACI 360R-10 framework for sizing a pad to a tank of this footprint and load. If you are running it as a mobile or fleet utility tank, our breakdown of portable utility tanks and the 49 CFR 173.5 agricultural exemption covers how these vessels are classified for farm-fleet road use. The most common mistake on a hauling tank this large is treating the 1.5 SG rating as protection for the whole system: it protects the poly wall, not the fittings. When you haul a product denser than water, confirm the bulkhead gaskets and valve seals are rated for your fluid's chemistry and pressure as well — that seal interface, not the wall, is the usual failure point. Capacity and weight are two different limits, and the 52,542 lb figure is the one that protects the tank.
Storage and reuse roles
Beyond hauling, this Norwesco white utility tank works as fixed bulk storage for non-potable water, fire reserve, and reuse service. If you are sizing a private fire-water reservoir, our write-up on fire-water reservoir tank design for rural and remote sites covers NFPA 22 sizing discipline and cold-climate freeze protection. For grey-water, rainwater, and HVAC condensate aggregation, see our industrial water reuse tank topology overview.
This tank ships LTL freight from Norwesco's plant in St. Bonifacius, MN, quoted live to your ZIP. Get your freight quote in seconds with the Freight Cost Estimator, or call 866-418-1777 to talk through hauling-frame fit, pad prep, lead time, or speccing a higher-SG option for denser chemistry with our team.
