Snyder Industries 500 Gallon HDPE Vertical Liquid Storage Tank with ASTM Certification

The Snyder Industries 500 Gallon HDPE Vertical Liquid Storage Tank is a 500-gallon vertical storage tank built from polyethylene and carried at a 1.9 specific gravity rating, with ASTM certification documented on the technical drawing on this page. At 77 inches tall on a 53 x 53-inch footprint, it holds full volume on a compact 53-inch square base, so plan your pad and overhead clearance around those numbers before you order. It ships from the Snyder plant in Marked Tree, Arkansas, so run your ZIP through the Freight Cost Estimator before you commit.

Will it work for your site?

Filled with water, this HDPE vertical tank carries roughly 4,170 lb, and its 1.9 specific gravity rating means the wall is rated to hold contents up to about 7,923 lb total. That high SG rating is the headroom that lets this tank handle denser liquids than plain water without exceeding its design limit - useful if you are storing anything heavier than fresh water down the road. The fitting package shown on the technical drawing includes a flange, an 18-inch PE threaded and vented fitting, and a manway with 15-inch access, so you have a top opening for inspection and cleaning plus a vented connection for fill and air exchange. One detail buyers miss: the 15-inch manway seals on a gasket and the 18-inch fitting threads in - match both the gasket and any thread sealant to your stored liquid's chemistry, not just the tank wall. Confirm fitting locations and elevations against the drawing before you plumb the site.

Sizing it right

Use the Tank Sizing Calculator and the Tank Sizing Guide to confirm 500 gallons matches your real draw and refill cycle before you commit. The 1.9 rating means the full 500 gallons stays usable for liquids up to 1.9 SG, but still size for usable volume rather than brim-full - leave freeboard for thermal expansion and any agitation. For the engineering behind that, the guide to HDPE tank wall thickness and ASTM D1998 sizing logic is worth reading before you finalize a spec. If your service is genuinely high-density or needs secondary containment, the Snyder Captor double-wall freeboard guide is worth a look first - a 1.9-SG single-wall tank and a containment system are different decisions.

The mistake to avoid

The most common error on a high-SG vertical tank like this one is reading the 1.9 specific gravity rating as a capacity number - it is not. It is the maximum density the wall is engineered to support. Storing a liquid heavier than 1.9 SG, or stacking external load the tank was never rated for, is how these tanks fail early. Match your liquid's specific gravity to the 1.9 rating, vent the tank properly through that 18-inch vented fitting, and keep the manway sealed between inspections.

This 500-gallon vertical storage tank ships LTL freight from Marked Tree, Arkansas, quoted live to your ZIP code - get your number with the Freight Cost Estimator or call 866-418-1777. Freight is quoted separately from the tank list price.