The Chem-Tainer 1850 gallon open top batch storage tank is a cylindrical, open-top polyethylene vessel built for high-density batching, mixing, and bulk water storage where you load from the top and watch the contents as they rise. It stands 83 inches tall on an 82 x 82 inch footprint, holds 1,850 gallons, and is molded in natural white polyethylene so you can read the liquid level through the wall as a visual estimate, not a calibrated gauge. The number that sets this tank apart is the 2.0 specific gravity rating - it is built heavier than a standard water-only vessel, which is what lets it carry dense batch contents safely.
Will it work for your batch?
Filled with water, this tank carries 15,429 pounds. Because it is rated to 2.0 specific gravity, its maximum rated contents weight runs to 30,858 pounds - it can hold a batch nearly twice as dense as water without overstressing the wall. That headroom is the reason to choose this open top tank for thicker slurries, blended solutions, and heavy batch work over a lighter storage tank rated only for water. As a decision cue: if your batch density sits at or below 1.5 specific gravity, a lighter-rated tank may fit and save you weight; in the 1.5 to 2.0 range, this is the right vessel. Confirm your actual batch density against the 2.0 ceiling before you fill. The 82 x 82 inch footprint and 83 inch height set your siting envelope - check overhead clearance for your fill method and any agitator or mixer you plan to mount, since the open top is what makes top-entry mixing and manual charging practical. If you are still choosing a size, the Tank Sizing Calculator and Tank Sizing Guide help you match capacity to your draw and refill cycle.
Fittings and the weight that catches people out
Our data lists no factory fittings for this open top tank, so treat it as a bare batch vessel: confirm any drain, bulkhead, or outlet - and the gasket material that goes with it - by phone before ordering, since open-top batch tanks are commonly plumbed by the installer. See the technical drawing on this page for the wall and base geometry before you spec a bottom outlet. The siting mistake to avoid is sizing your pad for water weight when you intend to run a dense batch. A full 1850 gallon tank concentrates over 15,000 pounds of water - or up to 30,858 pounds at full rated density - onto an 82 inch square, and that load needs a flat, fully supporting pad, not bare soil or a partial frame. Our guide on concrete pad sizing for above-ground polyethylene tanks walks through the ACI 360R-10 framework so the base does not crack or settle under that point load. Size the foundation for the contents you will actually store, up to the 2.0 specific gravity rating, not for water alone.
Freight
This open top batch tank ships LTL freight from the Chem-Tainer plant in Hummelstown, Pennsylvania, and freight is quoted live to your ZIP - we do not bundle it into the list price. At 82 inches wide it exceeds typical liftgate platform dimensions, so confirm forklift or crane availability at the delivery site before the truck arrives. Get a number before you commit with the Freight Cost Estimator, or call us at 866-418-1777 and we will quote the lane and confirm offload requirements for a tank this size. If you are planning a bulk water program, our guide on fire-water reservoir tank design covers NFPA 22 sizing discipline, and our guide on industrial water reuse tank topology covers how to band quality and stage storage trains across multiple vessels.
