The Snyder Industries 3000 Gallon Captor Double Wall Liquid Storage Tank is rated for water and general liquids up to a 1.9 specific gravity, with integral secondary containment sized to capture the full contents of the inner tank if the primary ever fails. It holds 3000 gallons in a 102-inch by 102-inch footprint and stands 142 inches tall. The shell is opaque white High Density Linear Polyethylene, and that 1.9 SG rating is the single number that decides whether this double wall tank is right for your liquid.
Will it fit and will your pad hold it
Three numbers decide siting before you buy: a 102 x 102 inch footprint, 142 inches of height, and a maximum rated contents weight of roughly 47,538 lb. Check the 142-inch height against your door, eave, or shelter clearance, and treat the 47,538 lb figure as a foundation input, not just a freight talking point. Your pad and floor have to carry the full rated load, not the empty tank. Filled with plain water this tank holds about 25,020 lb of liquid; at the full 1.9 specific gravity rating the contents can reach roughly 47,538 lb. That spread is the entire point of a Captor double wall tank: you can store a liquid up to 1.9 SG without exceeding what the wall is engineered to hold. Confirm your liquid's specific gravity before you order, and never run a product heavier than 1.9 SG in it.
Fittings, venting, and your hookup plan
The technical drawing on this page shows three ports, and each does a specific job in your fill, vent, and outlet plan. The 18-inch PE threaded and vented fitting is your atmospheric venting path - size it for your fill and draw rate so the tank breathes without pulling a vacuum or over-pressurizing. The FLANGE is your bulkhead outlet tie-in for plumbing the draw line. The MANWAY with 15-inch access is your gasketed entry and inspection port; confirm your gasket material against the fitting and your service. See the technical drawing on this page for fitting placement and elevations, then run your numbers through our Tank Sizing Calculator or read the Tank Sizing Guide if you are still settling on volume and freeboard.
Double-wall sizing and the mistake to avoid
The common error on a double wall storage tank is treating the 1.9 rating as headroom for thermal expansion and freeboard. It is not - it is the density ceiling. You still need usable volume below the maximum fill line, and on a Captor that working-volume math is specific to the geometry and the chemistry of what you store, so the gallons you can actually use sit below the 3000-gallon gross. Our walkthrough on Captor double-wall freeboard sizing per ASTM D1998 gives you the real volume you can actually use. If this tank is going into a containment role for a regulated liquid, the Captor double-wall tanks for SPCC 40 CFR 112 compliance walkthrough shows how the integral secondary containment maps to your plan, and for fire-water reservoir duty see fire-water reservoir tank design and NFPA 22 sizing discipline.
Inspection and long-term integrity
One detail operators miss on tall polyethylene tanks: failures often start at the vapor-saturated headspace, not the liquid side, so a liquid-level inspection can pass while the upper wall is the weak point. The 15-inch manway access matters here for getting eyes on the interior. Our piece on HDPE tank wall thickness at the vapor-saturated headspace explains why, and how the ASTM D1998 sizing logic accounts for it.
This 3000 gallon Snyder double wall storage tank ships LTL freight from Lincoln, NE, quoted live to your ZIP code. At roughly 25,020 lb of water weight before contents, freight on a tank this size is a real line item - get an exact number with our Freight Cost Estimator or call 866-418-1777 and we will quote it to your delivery point. Questions on the fittings, the manway layout, or whether the 1.9 specific gravity rating covers your application? Call us before you order so the tank that arrives is the one your liquid actually needs.
