The Norwesco 15500 Gallon Vertical Liquid Storage Tank in blue is a large single-tank polyethylene reservoir, standing 244 inches tall on a 141-inch-diameter footprint. Molded from polyethylene with a 1.9 specific gravity rating, it is built to hold heavy liquids well beyond the density of plain water, which makes it a workhorse for bulk water storage, fire-water reservoirs, agricultural supply, and industrial water reuse where a vertical storage tank of this scale is needed.
Will this Norwesco vertical tank work for your site?
Capacity is 15,500 gallons. At full water the contents weigh 129,270 lb, and the tank is rated to carry up to 245,613 lb of contents at its 1.9 specific gravity ceiling. That ceiling is not arbitrary: 15,500 gallons of a 1.9-specific-gravity fluid works out to roughly 15,500 x 8.34 lb/gal x 1.9, which lands right at the 245,613 lb rating, so the number is self-checking. The 1.9 rating is the figure to design around: it tells you the tank wall is engineered for liquids heavier than water, but you still must confirm your stored liquid's specific gravity stays at or below 1.9. The footprint is the full 141-inch diameter, so plan a level pad that fully supports the base. A tank this tall and this heavy when full belongs on an engineered concrete pad sized for the loaded weight, not bare soil or gravel. Our concrete pad sizing guide walks through the ACI framework for above-ground polyethylene tanks of this size, and the Tank Sizing Calculator and Tank Sizing Guide help you confirm 15,500 gallons matches your draw and refill cycle before you commit.
Fittings, the 22-inch lid, and the SG ceiling
This tank has been revised for a 22-inch lid, giving you a wide top access opening for inspection, cleaning, and top-mounted plumbing, and that lid is the sealing point on the top of the tank. If you are storing anything more aggressive than water, confirm the lid gasket and seal material is compatible with your liquid before service, because the polyethylene wall and the seal are two separate compatibility questions and the gasket is usually the weaker of the two. For exact outlet and fitting locations, see the technical drawing on this page before you set your plumbing and pad layout, since fitting placement drives where your discharge line and any pad penetrations need to go. One hard limit to respect: 1.9 specific gravity is the top of this tank's range. If your fluid exceeds 1.9 SG, this is not the right unit and you should call 866-418-1777 for a correctly rated tank rather than stretching this one past its design.
Common uses and the mistake to avoid
At 15,500 gallons this Norwesco vertical tank is a natural fit for rural and remote fire-water reservoirs, where stored volume is the backbone of a private fire-protection system. Our guide to fire-water reservoir tank design for rural and remote sites covers NFPA 22 sizing discipline and cold-climate freeze protection, and the industrial water reuse topology guide shows where a bulk vertical tank fits a grey-water, rainwater, or HVAC condensate aggregation train. The mistake to avoid: undersizing the pad and underestimating the loaded weight. A loaded contents figure of up to 245,613 lb is not a number to round down on. For a full walkthrough of selection, siting, and use, the 15500 Gallon Vertical Liquid Storage Tank buyer's guide goes deeper than this page can.
This tank ships LTL freight from the Norwesco plant in Hanford, CA, quoted live to your ZIP. On a unit this size, the Hanford, CA origin drives the freight cost more than any other factor, so West Coast and Southwest sites will quote far better than East Coast destinations. Get a number in minutes with our Freight Cost Estimator, or call 866-418-1777 and we'll quote it and walk you through pad, fitting, and delivery planning.
