The Norwesco 525 Gallon Spherical Liquid Storage Tank is a white polyethylene sphere built for above-ground bulk water and liquid storage where a compact, self-supporting footprint matters. It holds 525 gallons inside a 62-inch-wide by 62-inch-deep base and stands 64 inches tall, so it occupies the same square footprint as a 62 x 62-inch pad while keeping its center of gravity low. The spherical shell is rated to a 1.9 specific gravity, which is the strongest spec on this Norwesco tank: it gives you real structural headroom over plain water for denser liquids.
Will it work for your site?
For water service this tank carries plenty of margin. Filled to capacity with water, the contents weigh 4,378 lbs; the shell itself is engineered to carry up to 8,319 lbs of rated contents at its 1.9 specific gravity ceiling. That gap is your safety factor, and it is why a spherical Norwesco storage tank is a common choice for rural fire-water reservoirs, hauled-water storage, rainwater capture, and process or reuse water where a dependable, low-profile vessel is needed. The 62 x 62-inch footprint and 64-inch height let it slot into tight equipment yards, well houses, and pump skids. Before you set it, confirm your pad is sized for the full water weight plus any local load factors. Our Tank Sizing Calculator and Tank Sizing Guide help you match capacity to demand, and our guide on concrete pad sizing for above-ground polyethylene tanks walks through the ACI 360R-10 framework for a proper foundation.
Sizing and supporting roles
At 525 gallons this storage tank sits in a sweet spot for sites that need meaningful reserve without jumping to a multi-thousand-gallon vertical. If you are designing a private fire-protection reserve, our deep-dive on fire-water reservoir tank design for rural and remote sites covers NFPA 22 sizing discipline and freeze-protection engineering for cold-climate service. For sites aggregating grey water, rainwater, or HVAC condensate, the industrial water reuse tank topology guide shows how quality-banded storage trains fit together. One thing this listing does not stamp is fitting detail: outlet, fill, and vent sizes and their gasket or bulkhead requirements are not specified in the spec data, so read them off the technical drawing on this page or confirm them by phone at 866-418-1777 before you plumb the tank.
The mistake to avoid
The 1.9 specific gravity stamped on this tank is a structural rating, not a chemical-service approval. It tells you the shell can carry liquid up to 1.9 times the weight of water - which is exactly why this sphere works for denser liquids that a standard 1.0 to 1.5 SG tank would not - but it does not mean any heavy liquid is chemically compatible with the polyethylene. For general water duty this tank is well within spec. If you are considering anything beyond water, verify two things before you order: that the liquid is compatible with the polyethylene shell, and that your gasket and fitting materials are compatible with it as well, since gaskets are the common failure point and are not covered by the SG rating. The other frequent miss is the foundation: a full tank moves the better part of 4,400 lbs of water onto your pad, so size and level the base before delivery, not after.
This Norwesco 525 gallon spherical tank ships LTL freight from a single plant, Hanford, CA, and freight is quoted live to your ZIP - so for sites east of the Rockies it pays to get your rate before you commit. Pull an exact number with our Freight Cost Estimator, or call 866-418-1777 to confirm availability, lead time, and delivery requirements before you order.
