The Snyder Industries 1550 Gallon ASTM Black Captor Double Wall Tank is a containment-grade vessel for operators who need primary storage and secondary containment in one footprint. Molded from high density linear polyethylene and carrying a 1.9 specific gravity rating, this black double wall tank holds 1,550 gallons and stands 136 inches tall on a compact 76 x 76 inch base. The integrated outer wall captures the full contents of the inner tank, so you get built-in spill protection without pouring a separate containment berm.
The 1.9 SG rating is the headline spec
The 1.9 specific gravity rating is what sets this tank apart from a standard 1.0 to 1.5 SG water tank. It means the wall is engineered to carry up to 24,561 pounds of rated contents, roughly 1.9 times the weight of a full water load. For reference, 1,550 gallons of water weighs about 12,927 pounds. That headroom is the reason to spec this Captor double wall over a lighter-rated vessel when your loaded weight or density margin matters.
Will this tank work for your site?
Confirm your pad or slab is rated for the loaded weight over the 76 x 76 inch footprint before you set it. The tank comes fitted with a flange, an 18-inch PE threaded, vented opening, and a manway with 15-inch access for filling, inspection, and cleaning. Review the fitting locations and elevations on the technical drawing on this page against your plumbing and vent runs, and confirm the flange bolt pattern and gasket seal along with the 18-inch thread interface against your connections before ordering any adapters. Verify vent adequacy for your fill and draw rates against the drawing as well. If you are still deciding on capacity, our Tank Sizing Calculator and Tank Sizing Guide walk you through matching volume to real-world draw.
Freeboard and double-wall sizing
Double-wall tanks carry usable-volume rules you should understand before ordering. Our guide on Captor freeboard sizing per ASTM D1998 explains thermal expansion and the volume you can actually use, and the SPCC 40 CFR 112 compliance walkthrough covers how the captured secondary wall factors into your spill plan. For fire-water and cold-climate storage, see our notes on fire-water reservoir design and freeze protection.
The mistake to avoid
The most common oversight on tall double-wall tanks is the headspace above the liquid line. Vapor-saturated headspace is where premature wall failures tend to start, which is why you should read HDPE wall thickness at the vapor-saturated headspace before commissioning. Use the 15-inch manway access as your service opening to inspect the inner wall and the annular space between walls on a regular schedule, and keep the vented opening clear.
This tank ships LTL freight from the Snyder plant in Philippi, West Virginia, quoted live to your ZIP. Get a freight rate with our Freight Cost Estimator or call 866-418-1777 to lock in delivery. Listed before freight.
