The Snyder Industries 6600 Gallon HDPE Vertical Liquid Storage Tank (SKU SII-5300400N43) is a full-size bulk vertical built in white polyethylene, ASTM-certified, and sized for serious water storage. At 6,600 gallons it stands 158 inches tall on a 120 x 120 inch footprint, so before you commit a site you need a clear 10-foot square of level ground and roughly 13 feet of vertical clearance. This is a true vertical storage tank for operations that have outgrown smaller poly tanks and need real reserve capacity in one vessel.
Will it work for your site?
The weights are what govern the install. Filled with water, this tank carries about 55,044 lb of contents; at its full 1.5 specific-gravity rating it is engineered to hold up to 82,566 lb of contents weight. That higher 1.5 SG wall rating is real headroom for water service — it is over-spec'd versus a 1.0 or 1.1 SG vertical of the same gallons, and it keeps the door open if you later move to a denser fluid up to 1.5 SG. Plan the foundation around the heavy case: the pad must be engineered for the full 82,566 lb max-rated contents weight plus the tank's own dead weight and any seismic or wind load — not the 55,044 lb water-only number, which is how operators under-build. A 6,600-gallon vertical of this class belongs on an engineered concrete pad, not on bare or compacted soil. Our concrete pad sizing guide using the ACI 360R-10 framework walks through how to size that pad and where the ACI 318 boundary comes in. To confirm 6,600 gallons is the right number for your draw and refill cycle, run your demand through the Tank Sizing Calculator or read the Tank Sizing Guide first — and remember that nominal 6,600 gallons is the overflow capacity, so per ASTM D1998 freeboard your usable operating volume sits below the brim. The Snyder freeboard sizing guide shows how to figure the volume you can actually use.
Fittings and access
Per the technical drawing on this page, this tank is configured with a flange, an 18-inch PE threaded and vented fitting, and a manway with 15-inch access. The vented fitting matters: a vertical tank of this volume moves a lot of air as it fills and drains, and proper venting keeps the headspace from pulling vacuum or building pressure. The 15-inch manway access lets you get inside for inspection and cleaning. Before you buy mating bulkheads, gaskets, or valves, confirm the flange bolt pattern and gasket fit and the threaded-fitting thread spec against the drawing — those details come off the drawing, not the spec sheet — so you don't order an incompatible flange kit or gasket. Outlet placement drives how you tie into the tank, so settle plumbing positions before ordering.
One thing not to overlook
HDPE verticals tend to show their age first at the vapor-saturated headspace near the top, not down at the liquid line where most people look. The HDPE wall-thickness and ASTM D1998 sizing article explains why upper-wall inspection catches problems that liquid-side checks miss. If you are sizing this as a fire-water reservoir, the NFPA 22 fire-water reservoir design guide covers the sizing and freeze-protection discipline that service demands.
This tank ships LTL from the Snyder plant in Chowchilla, CA, and at 158 inches tall on a 120-inch square base it moves as oversized freight — a vertical this size typically ships standing and needs a forklift or crane for offload plus clear overhead access at the delivery point. Get a live rate to your ZIP with our Freight Cost Estimator, which confirms liftgate and access requirements as it quotes, or call 866-418-1777 and we will quote the haul and confirm delivery access. Listed price is before freight, which is quoted separately to your destination.
