The Chem-Tainer 650 gallon open top batch storage tank is a cylindrical, open-top polyethylene vessel built for operations that fill, blend, mix, and draw down on a repeating cycle. It holds 650 gallons, stands 84 inches tall on a 48-inch by 48-inch footprint, and is molded in natural white polyethylene. The open top gives you full overhead access for manual batching, top-entry mixing, and a clear line of sight on every fill. If you have been searching for an open top tank, a white open top tank, or a plain open tank for storage and batch work, this is the size that sits between bench-scale drums and large bulk verticals.
Will it work for your batch process?
The numbers a process buyer needs are all here. Capacity is 650 gallons in a single cylindrical body, 84 inches high by 48 inches in both width and length. Filled with plain water the tank carries roughly 5,421 pounds. Its real headline spec is the specific gravity rating of 1.9: it is built to hold liquids up to 1.9 times the density of water, and at this 650-gallon volume that 1.9 rating is exactly where the 10,300-pound maximum contents weight comes from. That is a high rating for an open-top polyethylene tank, where 1.5 is more common, so most dilute solutions sit comfortably inside its working range. Use the Tank Sizing Calculator and the Tank Sizing Guide to confirm batch volume and head pressure for your specific liquid before you order, and check the technical drawing on this page for the exact dimensional layout.
The mistake to avoid
The footprint is where open-top tanks get installed wrong. At 84 inches of fill height on a 48-inch square base, this is a tall, narrow vessel - roughly a 1.75-to-1 height-to-width ratio - so it is sensitive to an out-of-level or undersized pad. The full water weight of about 5,421 pounds, and up to 10,300 pounds with denser contents at the 1.9 rating, has to be carried by a flat, fully supported, level foundation, not by the lower wall spanning an uneven surface. Pour a proper pad before placement; our guide on concrete pad sizing for above-ground polyethylene tanks walks through the framework. The second thing to confirm is that the specific gravity of your actual liquid is within the 1.9 rating - water and most dilute solutions are well within range, but if your contents are denser than 1.9, this is not the right tank and we will point you to one that fits. Call 866-418-1777.
Fittings and outlets
This listing ships as a plain open-top vessel - we do not list a factory bulkhead, drain, or outlet on this SKU, so we will not imply one is included. If you need a lower-wall outlet or bulkhead fitting, that matters here: at 84 inches of fill height the liquid head on any low fitting is significant, and the gasket material has to match your liquid. Confirm the fitting size and gasket material against your contents before ordering, and call 866-418-1777 so we can spec it correctly rather than guess.
Freight
This tank ships LTL freight, quoted live to your ZIP code - we never bake freight into the list price. It ships from the Chem-Tainer plant in West Babylon, New York. Get a real number in seconds with the Freight Cost Estimator, or call us at 866-418-1777 and we will quote it for you and answer any questions about lead time or whether this 650-gallon open top is the right size for your batch operation.
