The Snyder Industries 330 Gallon Open Top Total Drain Batch Tank is an open-top, cylindrical, dish-bottom tank built for batch mixing and complete drain-down between runs. It stands 80 inches tall on a 42 x 42 inch footprint, holds 330 gallons, and is molded in white High Density Linear Polyethylene with a 1.9 specific gravity rating. That 1.9 rating is the headline number on this open top tank: it means the shell is structurally rated for contents up to 1.9 times the weight of water, well above the 1.0 SG of plain water, so you have real headroom for heavier batch contents.
Will it work for your batch?
Full of water, this tank carries 2,752 pounds. At its maximum rated contents weight it carries 5,229 pounds. Plan your pad, your handling, and your rigging around the 5,229-pound figure, not the empty tank and not the water weight: if you batch anything heavier than water toward the 1.9 SG ceiling, the contents alone approach that gross load, so size lifting and forklift capacity to 5,229 pounds. The 42 x 42 inch footprint is what the floor sees, and the dish bottom with total-drain geometry is the reason this tank empties cleanly between batches instead of leaving a heel behind. The open top gives you full access for charging ingredients, running a mixer, and washing out, which is exactly what people are after when they search for an open top tank instead of a closed vertical. Before you commit to a height, run your batch volume and turnover through our Tank Sizing Calculator and read the Tank Sizing Guide.
Outlets and total drain
This open-top batch tank ships without a pre-installed bottom outlet, so you spec and install the bulkhead and gasket to match your own drain-time target. The total-drain dish bottom is built to empty without a low-point puddle, but the outlet sizing is on you. The math is the same discipline used on cone-bottom drains: get the outlet large enough to drain the batch in the time your process needs. Our guide on Cone Bottom Discharge Engineering: 1-inch vs 1.5-inch vs 2-inch bulkhead sizing for drain time walks through the bulkhead tradeoffs so you can match the outlet to your drain-down time, and the same outlet-geometry thinking in our cone-bottom outlet sizing guide applies if you are draining anything with solids.
The mistake to avoid: support and SG
The most common mistake on a dish-bottom open-top tank is treating support as an afterthought. A dish bottom needs continuous, level support across the entire base, not a partial ring or a rough slab, or you concentrate load and stress the shell. At 5,229 pounds maximum rated weight, the pad is not optional. Size it correctly using the framework in our guide on Concrete Pad Sizing for Above-Ground Polyethylene Tanks. The second mistake is over-trusting the SG number against your contents. The 1.9 rating defines the structural envelope for weight; it does not by itself approve any particular chemical. You are paying for that headroom over a standard 1.0 to 1.5 SG water tank, so use it for heavier batches, but confirm resin compatibility before you fill it with anything but water. Confirm the exact dish profile and dimensions on the technical drawing for this tank before you set your mounting and outlet locations.
This white open top tank ships LTL freight, quoted live to your ZIP, from the Snyder plant in Marked Tree, AR. Get a real number for your address with our Freight Cost Estimator, or call 866-418-1777 and we will quote freight to your ZIP and confirm resin compatibility for your batch before you rely on the 1.9 structural rating.
