The Chem-Tainer 90 Gallon PE Rectangular Open Top Tank is a polyethylene rectangular open top tank built for batching, washdown, parts soaking, and general above-ground water storage where an open working surface beats a closed dome. With 90 gallons of usable volume in a footprint that drops into a corner or onto a bench, this is a straightforward open tank for crews who need to see, dip into, and work out of their water supply without fighting a lid.
Will it work for your job
At 90 gallons of water, plan for roughly 751 pounds when the tank is full. That weight rides on the bottom of the rectangular shell, so set it on a flat, fully supported surface - a level concrete pad, a steel stand rated for the load, or a reinforced bench - never on point supports or an unsupported overhang. Because the load sits on a compact rectangular base, the bearing demand is real: about 751 pounds spread over the tank's footprint, so check that your bench or stand is rated for that concentrated weight before you fill it. The open top gives you direct top access for filling, mixing, dipping, and cleaning, which is why this style turns up so often as a rectangular open top tank in wash bays, plating lines, and small batch stations. If you are weighing this size against a larger or smaller open tank, run your numbers through the Tank Sizing Calculator and the Tank Sizing Guide before you commit to a footprint. See the technical drawing on this page for the exact outside length, width, and height, and confirm your pad or stand covers the full base.
Mounting and pad support
A full 90-gallon open top tank concentrates its load over a relatively small rectangular base, so the supporting surface matters more here than on a tall, narrow tank. For permanent above-ground placement on concrete, our guide on concrete pad sizing for above-ground polyethylene tanks walks through the ACI 360R-10 framework for sizing the slab under a polyethylene tank. Match the pad or stand to the full footprint shown on the technical drawing, not just the corners, so the base is supported edge to edge.
The mistake to avoid
The most common error with an open top rectangular tank is treating it like a sealed storage vessel. This configuration is open at the top by design - there is no gasketed lid - so do not plan on pressure, vacuum, or fully closed containment. It is a water-service tank: keep its use to water and the duties it is built for, and do not assume chemical-resistance ratings that are not published for this model. If your application is closed rainwater or reuse storage rather than open working volume, the topology in our industrial water reuse tank topology guide can help you pick the right closed vessel instead.
One freight note worth knowing before you commit: this tank ships LTL freight from Chem-Tainer's plant in West Babylon, New York, and only that plant, so freight scales hard with distance - a buyer in the West should quote the real number before falling for the list price. Get a freight estimate to your ZIP with the Freight Cost Estimator, or call 866-418-1777 and we will help you confirm the size, pad requirements, and freight for your site.
