The Snyder Industries 4500 Gallon ASTM Black Double Wall Tank is a large-volume double-wall storage tank molded in high density linear polyethylene (HDLPE) and built to ASTM D1998, rated to a 1.9 specific gravity. Its body measures 102 in wide x 102 in long x 197 in tall, and the double-wall construction places a primary tank inside an integrated secondary containment shell, so a leak in the inner wall is caught by the outer wall instead of reaching the ground. That is the reason operators reach for this style of double wall tank when a spill would be a problem. The black HDLPE is a functional spec, not a color choice: black resin blocks light through the wall, which suppresses algae growth in stored water and makes this a sound pick for bulk water and process-water service where secondary containment is required.
Will it work for your site
Plan around the real numbers. At 4500 gallons of plain water this tank carries roughly 37,530 pounds of contents, and its 1.9 specific gravity rating allows a maximum rated contents weight of about 71,307 pounds for denser liquids. The 102 x 102 inch footprint has to sit on a pad that is engineered, level, and continuously supported across the full base - a black double wall tank at this mass is unforgiving of a soft or uneven foundation. The 197-inch overall height also means you should confirm overhead clearance and fill access before delivery. Use the Tank Sizing Calculator and the Tank Sizing Guide to match usable volume to your draw rate, and read our guide on Snyder Captor double-wall freeboard sizing per ASTM D1998 to understand why the volume you can actually use sits below the nameplate rating.
Fittings and the mistake to avoid
The single most common mistake with a tank this large is treating the specific gravity rating as a formality. The 1.9 rating tells you the heaviest liquid density the wall thickness is built for; water is well within that envelope, but if you are considering a denser liquid, verify it stays under 1.9 before you buy. This listing does not lock in a standard fitting package - outlet, bulkhead, and inlet placement are not pre-specified here, so confirm the fitting layout and sizing against the technical drawing on this page (or by phone) before you plumb the site. For a double wall tank, also plan how you will monitor the interstitial space between the walls; our guide on interstitial space and containment methodology covers the boundary conditions that matter for secondary containment. If this feeds a rural or remote fire-water reserve, the fire-water reservoir design guide walks through NFPA 22 sizing and freeze protection.
Freight
This tank ships by LTL freight from the Snyder plant in Lincoln, Nebraska, quoted live to your ZIP code. It arrives empty, but plan the offload and pad conversation around the loaded numbers already known: about 37,530 pounds full of water and up to roughly 71,307 pounds at the maximum rated density. Combined with the 197-inch height, that heavy profile is why freight is arranged per destination rather than flat-rated. Get your number in seconds with the Freight Cost Estimator, or call us at 866-418-1777 and we will work out delivery, offload, and pad requirements with you before the truck rolls.
