The Norwesco 300 Gallon Black Vertical Storage Tank is a closed-top polyethylene tank standing 79 inches tall on a 35-inch-diameter base, built for above-ground water storage where vertical height saves floor space. The black resin blocks light to limit algae growth, making this a practical choice for outdoor water storage, irrigation supply, rural fire-water reserves, and general bulk holding. It ships from the nearest of ten Norwesco plants, so the LTL freight quote to your ZIP reflects the closest origin to your site.
Will this tank work for your job?
The tank holds 300 gallons and carries a 1.5 specific gravity rating, which means the wall is rated to safely hold contents up to 1.5 times the weight of water. Filled with water, plan for roughly 2,502 pounds of contents; loaded to its full 1.5 SG rating, the tank can carry up to 3,753 pounds. Those two numbers set the slab or stand spec underneath it. They also carry a real planning consequence: if you store a liquid heavier than water, you hit the 3,753-pound max-rated-contents ceiling before the tank is physically full, so your usable volume drops below 300 gallons. For a vertical tank this size, the pad has to be flat, fully supporting the entire 35-inch-diameter base, and level - an unsupported or sloped base is the most common cause of stress cracking on a poly vertical. The 35-inch diameter is also your access number: that is the clearance you need to move the tank through gates or doorways and onto the pad, and the 79-inch height plus the molded dome needs overhead room for the fill fitting. Our Tank Sizing Calculator and Tank Sizing Guide help you confirm this 300-gallon vertical storage tank matches your volume and space before you order.
Foundation and fitting placement
Because the loaded weight climbs to over 3,700 pounds at the full SG rating, the foundation matters more than the tank itself. Our guide on concrete pad sizing for above-ground polyethylene tanks walks through the ACI 360R-10 framework for getting that slab right. Fitting and outlet locations are not listed in the spec for this tank - confirm them from the technical drawing on this page, or call 866-418-1777, before you plan plumbing runs and valve clearances. If you are sizing this tank into a rural or remote water system, the guide on fire-water reservoir tank design covers NFPA 22 sizing and cold-climate freeze protection for poly tanks in that role.
The mistake to avoid
The 1.5 specific gravity rating describes the structural limit of the tank wall - it does not make the tank suitable for chemical service. This is a water storage tank. Storing a liquid heavier than water, or a chemical, without verifying both the specific gravity and the resin against an OEM chemical-resistance chart is the error that ends in a failed tank. For water, irrigation, rainwater capture, and fire-reserve duty, keep it within those uses and you will get the full service life. If you are reusing collected water, our guide on industrial water reuse tank topology covers quality-banded storage trains for grey-water, rainwater, and HVAC condensate.
This Norwesco vertical storage tank ships LTL freight from the nearest of ten Norwesco plants - Fairfield, TX; Griffin, GA; Hanford, CA; Owego, NY; Shawnee, OK; Sheldon, IA; St. Bonifacius, MN; Tooele, UT; Washington Court House, OH; or Washougal, WA - with the rate quoted live to your ZIP. Get your freight cost in seconds with our Freight Cost Estimator, or call 866-418-1777 and we will quote it for you and confirm the right tank for your site.
