The Norwesco 265 Gallon Vertical Liquid Storage Tank (SKU N-45875) is a polyethylene vertical tank for liquid storage where floor space is tight but head height is available. It stands 91 inches tall on a 31-inch diameter footprint, holding a meaningful volume in a narrow column rather than spreading across the ground. Its 1.9 specific gravity rating is what separates this vertical storage tank from a basic water-only vessel.
Key specs at a glance
Capacity: 265 gallons | Height: 91 in | Diameter: 31 in (footprint 31.0 dia) | Material: polyethylene | Specific gravity rating: 1.9 | Full of water: ~2,210 lb of contents | Maximum rated contents: ~4,199 lb | Ships from: Fairfield, TX. Every number you need to check fit-to-pad is here; the technical drawing on this page carries the dimensional callouts.
Will it work for your liquid?
This tank holds up to 265 gallons. Filled with water it carries about 2,210 pounds of contents, and the 1.9 specific gravity rating means it is engineered to hold liquids up to 1.9 times the weight of water at full volume - a maximum rated contents weight near 4,199 pounds. Here is the math that closes the loop, using the tank's own numbers: 4,199 lb max contents divided by 265 gallons divided by 8.34 lb per gallon lands right at 1.9 SG. So any liquid at or below 1.9 SG can fill to the full 265 gallons safely; if your liquid is denser than 1.9 SG, this is not the right vessel. That 1.9 ceiling is why a vertical storage tank like this gets specified for liquids heavier than plain water, not just fresh-water duty. Run your gallon size and fill weight through the Tank Sizing Calculator and the Tank Sizing Guide so the volume and pad load line up with your application.
Footing, placement, and the slender profile
At 91 inches tall on a 31-inch diameter base, this is a tall, narrow tank - close to a 3-to-1 height-to-diameter ratio - and a tank holding up to roughly 4,199 pounds of contents needs a flat, fully supported foundation under the entire footprint. A vertical column that size does not tolerate an uneven or partial bearing surface. Because the profile is this slender, an empty tank is light relative to its height, so anchoring or tie-down should be evaluated for exposed or wind-prone installs. Size and pour the pad correctly before delivery - our guide to concrete pad sizing for above-ground polyethylene tanks walks through the framework so the base carries the full rated load. If this is part of a rural fire-water reserve or a captured-water reuse setup, the fire-water reservoir design guide and the industrial water reuse topology guide cover how a tank this size fits into a larger storage train.
The mistake to avoid
The most common error on a vertical storage tank is treating the specific gravity rating as a footnote. The 1.9 SG figure is the ceiling for your liquid's density, not a suggestion - filling a column tank with a liquid heavier than its rating stresses the wall over time. Confirm your liquid's specific gravity, then size to the gallon volume you actually need. Because the pack carries no fitting schedule for this unit, confirm outlet and fitting configuration by phone at 866-418-1777 before you order rather than assuming a thread size. For deeper sizing detail on this exact model, see our 265 gallon vertical liquid storage tank buyer's guide.
This Norwesco vertical tank ships LTL freight from the Fairfield, Texas plant, with freight quoted live to your ZIP code. Get an exact number with our Freight Cost Estimator, or call 866-418-1777 to confirm fittings, talk through your install, and lock in delivery.
3 Year Warranty
