The Snyder Industries 18800-gallon vertical liquid storage tank is a Washington Court House, Ohio-built HDPE bulk-storage tank rated for 1.5 specific-gravity contents, standing 242 inches tall on a 165 x 165-inch footprint. At this scale it is a fixed-site reservoir for high-volume water and dense-liquid duty - the kind of vertical storage tank used for fire-water reserves, bulk process water, and agricultural supply where a single large vessel beats a farm of smaller ones. If you need dense-liquid service up to 1.5 times the weight of water, this is already the heavy rating; you do not need to step up to a separate "chemical tank" to get it.
Will this tank work for your application?
The HDPE shell holds 18,800 gallons and is engineered to ASTM D1998, the standard that governs polyethylene tank wall thickness as a function of fill height and contents density. The 1.5 specific-gravity rating means the wall is sized to carry liquids up to 1.5 times the weight of water, so the shell itself does not limit you to plain water. Plan your fittings around what the drawing shows: a 24-inch PE threaded and vented top opening, a manway with 22-inch access, and a bulkhead (BH) outlet. The 22-inch figure is the clear access opening - the dimension a person, a confined-space rig, or a mixer assembly has to pass through, so size your entry or interior equipment against it before you order. Because the top fitting is a vented design, confirm your vent and fill plumbing can move air fast enough for an 18,800-gallon vessel; rapid draw on a tank this size can pull a vacuum on the shell if the vent is undersized. Verify the bulkhead size and elevation against your discharge line. See the technical drawing on this page for the exact fitting layout and dimensions before you plumb.
Weight, footprint, and pad
Sizing this tank is a structural decision, not just a capacity one. Filled with water it carries 156,792 pounds; at its full 1.5 specific-gravity rating the contents alone reach 235,188 pounds. That load lands on a 165 x 165-inch footprint, so the pad underneath has to be engineered for it - not poured by eye. Work the load case before you order: our Tank Sizing Calculator and Tank Sizing Guide help you confirm the vertical tank fits your volume and headroom, and the guide on concrete pad sizing for above-ground polyethylene tanks walks through the ACI 360R-10 framework and the ACI 318 boundary that govern a foundation under a quarter-million-pound load. For fire-water duty specifically, the fire-water reservoir tank design guide covers NFPA 22 sizing discipline and freeze protection for cold-climate sites.
The mistake to avoid
Two numbers trip operators up on a tank this tall. The first is freeboard: the nominal 18,800 gallons is the shell capacity, and your usable volume sits below the top fitting and overflow line - don't bank on headroom you haven't calculated. The Snyder Captor freeboard sizing guide works the ASTM D1998 freeboard math, thermal expansion, and density so you know the real volume you can actually use. The second is wall thickness: on a 242-inch-tall vertical, premature failures originate above the liquid line at the vapor-saturated headspace, where routine liquid-side inspection misses them - the HDPE tank wall thickness guide explains why and what the ASTM D1998 sizing logic means for service life. One more: if you run the 1.5-SG rating with a dense chemical rather than water, the chemical-compatibility limit becomes the bulkhead gasket and any downstream valve seals, not the HDPE shell - spec those seal materials to the stored liquid.
This tank ships LTL from the Snyder plant in Washington Court House, Ohio, on a dedicated freight line given its size and weight. Freight is quoted live to your ZIP - run your destination through our Freight Cost Estimator for a delivered LTL rate, or call 866-418-1777 and our team will size the haul and the offload for a tank this large. Listed price is before freight.
