The 15500 Gallon Vertical Liquid Storage Tank from Norwesco is a bulk above-ground vertical storage tank molded from polyethylene, standing 244 inches tall on a 141-inch diameter footprint - that's roughly 20.3 feet of height on an 11.75-foot circle. It carries a 1.5 specific gravity rating, which is what lets it hold dense liquids, not just water, up to a maximum rated contents weight of 193,905 pounds. Full of plain water it weighs 129,270 pounds. At this scale almost every buyer decision turns on three things: whether the tank is rated for your liquid, how a vessel this size gets to your site, and what to confirm before you pour the pad.
Will it work for your application
This is one of the largest single vertical storage tanks Norwesco builds, sized for high-volume water storage where one big vessel beats a manifold of smaller ones - rural and remote fire-water reservoirs, bulk process water, and aggregated reuse streams all live in this range. For a full spec walkthrough before you commit, read the 15500 gallon complete buyer's guide. The 1.5 specific gravity rating means the polyethylene wall is built for liquids up to 1.5 times the density of water, so plain water (SG 1.0) leaves you a comfortable margin. That headroom is also a real option: because the tank is rated to SG 1.5, the same vessel handles denser water-based liquids up to 193,905 pounds of contents, so you can stay on this model instead of stepping up to a heavier-wall tank as your stored density rises. To pressure-test the volume against your real draw and refill cycle, run the numbers through our Tank Sizing Calculator or read the Tank Sizing Guide; for fire-protection sizing specifically, our fire-water reservoir tank design guide walks through NFPA 22 reserve discipline and cold-climate freeze protection.
Confirm the lid and fittings against the drawing
The technical drawing on this page is the dimensional authority for this tank and is noted as revised for a 22-inch lid - confirm that lid and any fitting locations against the drawing before you finalize plumbing, because at 244 inches tall, fitting height is not something you want to discover after delivery. When you order a replacement lid, vent, or gasket, match the 22-inch lid size from the drawing so the gasket and bolt pattern seat correctly.
The foundation is the real engineering
A tank this size is dead-simple as a vessel and demanding as a foundation. With 129,270 pounds of water bearing down on an 11.75-foot circle, the pad under it does the actual structural work, and getting it wrong is the expensive mistake here - not the tank. Before anything ships, size and reinforce the slab to carry the full rated load on your soil. Our concrete pad sizing guide lays out the ACI 360R-10 framework and where the ACI 318 boundary falls. If this tank is part of a grey-water, rainwater, or HVAC-condensate aggregation setup, the industrial water reuse tank topology guide covers quality-banded storage trains and treatment-stage sequencing.
Freight on a tank this size
This Norwesco vertical storage tank ships LTL from the Hanford, California plant - the only named production point we ship it from - and freight is quoted live to your ZIP code. Because California is the single origin, East-Coast and Midwest buyers should expect longer transit and higher LTL cost, so get the live ZIP quote early. A 20.3-foot-tall, 11.75-foot-diameter vessel is an oversize load, so plan the receiving end before you order: check gate, road, and overhead clearance against both dimensions, and line up equipment to offload it. Get a real number for your address with our Freight Cost Estimator, or call us at 866-418-1777 and we will work the route and delivery details with you before you commit.
3 Year Warranty
