The Snyder Industries 3650 Gallon HDPE Vertical Liquid Storage Tank (SKU SII-8190000N45) is a 1.9 specific-gravity vertical storage tank molded from high-density linear polyethylene, rated to hold contents up to 1.9 SG within its 3,650-gallon volume. It stands 126 inches tall on a 102 x 102 inch footprint, so before you commit to a slab, confirm the pad and overhead clearance can take a tank this size. This page carries the technical drawing for SII-8190000N45 - check it against your site plan before ordering.
Does this Snyder vertical storage tank fit your job?
Filled with water, this tank weighs roughly 30,441 lb; at its full 1.9 SG rating the contents and tank together reach about 57,838 lb. That ~27,400 lb gap between water-full and 1.9-SG-full is the usable density headroom you are paying for - it is the reason to pick the 1.9 SG rating over a lighter vertical tank of the same 3,650-gallon volume when your liquid runs heavier than water. Those loaded numbers drive your foundation, not the empty weight - run them through the Tank Sizing Calculator and read the Tank Sizing Guide if you are matching the tank to a fill schedule. The 102.0 x 102.0 inch footprint has to carry that loaded weight without settling; our concrete pad sizing guide walks through the ACI 360R-10 framework and where the ACI 318 boundary applies for an above-ground polyethylene tank this heavy.
Fittings, access, and mating hardware
The drawing for this tank shows a flange, an 18-inch PE threaded/vented fitting, and a manway with 15-inch access, plus a 12 x 13.75 inch fitting and S.U.M.O. flat fittings. The 15-inch manway access governs whether your maintenance crew and any internal hardware can get inside, so verify it against your service plan. Before you source valves, bulkhead gaskets, or any mating hardware, confirm the flange bolt pattern and gasket and the 18-inch threaded fitting's thread spec against the technical drawing on this page - thread, gasket, and bolt details drive what you order, and they should be read off the drawing rather than assumed from the capacity alone.
The ASTM D1998 sizing point and the 1.9 SG mistake to avoid
This tank is built and certified to the ASTM D1998 wall-thickness standard for polyethylene upright storage tanks, and that standard is exactly why the SG rating matters. A 1.9 specific-gravity tank is engineered to carry liquids substantially denser than water, and its wall is dimensioned around the density it is rated for. Do not down-spec a vertical tank to a lighter SG and then fill it with a heavy liquid - the wall thickness logic that backs an SG rating is worth understanding before you size. Our guide on HDPE tank wall thickness and ASTM D1998 sizing logic covers where premature failures actually originate and why liquid-side inspection misses them. If freeboard for thermal expansion or freeze service is in play, the Snyder Captor freeboard sizing guide applies; for high-volume reserve duty on rural and remote sites, the loaded weight and footprint here also feed the sizing in our fire-water reservoir design guide.
This vertical storage tank ships LTL freight from the Snyder plant in Marked Tree, Arkansas, and freight is quoted live to your ZIP - get a number in minutes with the Freight Cost Estimator or call 866-418-1777. Tell us your delivery ZIP and whether you need a liftgate or limited-access delivery, and we will confirm the LTL quote for this HDPE vertical tank before you order.
