The Norwesco 20,000 Gallon HDPE Vertical Liquid Storage Tank in Black is a large molded polyethylene vertical storage tank, holding 20,000 gallons of water in high-density linear polyethylene. It stands 242 inches tall (about 20 ft 2 in) on a 165 inch (roughly 13 ft 9 in) diameter, 165 x 165 inch footprint, built for bulk water storage where a single large reservoir beats a cluster of smaller tanks. The black resin blocks light through the wall, which slows algae growth in standing water. At roughly 20 feet tall, plan for the access, wind-load, and permitting checks that come with a tank this size, and confirm the 13'9" diameter clears your pad and surrounding equipment before you commit.
Will it work for your site
This black Norwesco vertical tank is rated to specific gravity 1.9, which is real headroom on a water application. Water fills at 8.34 pounds per gallon, so a full load weighs about 166,800 pounds; the tank is rated to a maximum contents weight of 316,920 pounds at its full 1.9 SG. Practically, a water fill (1.0) uses roughly half the wall's structural capacity, so you get long service margin on water and the same tank handles heavier brines, fertilizers, or process liquids up to 1.9 specific gravity without stepping up to a different build. Run your volume and turnover through the Tank Sizing Calculator and the Tank Sizing Guide to confirm 20,000 gallons fits your draw and refill cycle.
Foundation and stand engineering
At this weight the pad is not an afterthought. That 166,800 pounds of water sits over a 165 x 165 inch footprint, roughly 189 square feet, which works out to about 880 pounds per square foot of bearing on the pad at a water fill. Hand that number to your engineer to size the slab. The base must be level and fully supporting across the entire bottom of the tank. Read Concrete Pad Sizing for Above-Ground Polyethylene Tanks for the ACI 360R-10 framework, and if you are weighing a raised structure, Tank Stand Design for 5,000+ Gallon Vertical Tanks walks through FRP saddle versus steel cradle versus concrete pad for tanks in this class.
Service life, freeze protection, and fittings
On a tank this large the failure point is rarely the liquid side. The vapor-saturated headspace above the waterline is where premature wall problems tend to start, and liquid-side inspections miss them. HDPE Tank Wall Thickness at the Vapor-Saturated Headspace covers the ASTM D1998 sizing logic operators should understand before relying on a single large reservoir. If this tank anchors a rural fire-water or remote-site reserve, Fire-Water Reservoir Tank Design for Rural and Remote Sites covers NFPA 22 sizing discipline and cold-climate freeze protection. See the technical drawing on this page for dimensional detail, and call 866-418-1777 with your inlet, outlet, and bulkhead-fitting or gasket needs so the right configuration is confirmed and the correct fittings ship with the tank.
This tank ships LTL freight, quoted live to your ZIP, from the closest of three Norwesco molding plants to hold your cost down: Albertville, AL, St. Bonifacius, MN, or Washington Court House, OH. On a reservoir this size freight is a major line item, so get an exact number through our Freight Cost Estimator or call 866-418-1777 and we will quote it live to your delivery ZIP.
