The Snyder Industries 2500 Gallon ASTM Black Captor Double Wall Tank is a tank-within-a-tank built for installations where a spill simply cannot reach the ground. The Captor design encloses a primary storage tank inside an integral secondary containment shell, so the secondary containment that drives most spill-prevention plans is engineered into the unit rather than added with a separate berm or basin. This 2500-gallon double wall tank is molded in black High Density Linear Polyethylene with a 1.9 specific gravity rating, the heaviest-duty Captor structural rating, which is what makes it suitable for dense contents and demanding double-wall service.
Will this tank work for your application
The tank stands 122 inches tall on a 102 x 102 inch square footprint, so confirm both your overhead clearance and floor space before ordering. Filled with water, it carries roughly 20,850 pounds, and at its 1.9 maximum SG rating the contents weight reaches about 39,615 pounds. Use those numbers to spec your pad: a slab and subgrade sized for water weight is not the same as one sized for a dense fluid at full rating. Run your contents through the Tank Sizing Calculator and the Tank Sizing Guide to confirm the working volume and freeboard you can actually use, since usable capacity in a double-wall tank is governed by ASTM D1998 sizing and thermal expansion, not the nameplate gallons.
Fittings, venting, and interstitial access
Per the technical drawing on this page, the unit is configured with a flange, an 18-inch PE threaded and vented opening, and a manway with 15-inch access for inspection and interior service. The 18-inch fitting is the factory-configured vent, so do not spec a redundant vent or block it in the field; a blocked vent on a sealed poly tank is a real collapse and over-pressure failure mode. Reference the technical drawing for exact fitting locations and elevations before you set the tank, and verify your inlet, outlet, and vent layout against your plumbing plan so you are not relocating connections after the unit is in place. The reason to buy double wall over a single-wall tank plus a separate berm is the annular space between the primary and secondary shells: that interstitial gap is your leak-detection zone, so plan to monitor and inspect it on a routine schedule rather than waiting for a failure to surface at grade.
What to get right before you buy
The single most common mistake on a double wall tank is treating the 1.9 SG rating as a green light for any fluid. Because 1.9 is the top Captor structural tier, the structure itself is already maxed out for dense liquids, which means the only remaining gate is chemical compatibility, not structural capacity. The rating confirms the shell can hold a dense liquid; it does not confirm that your fluid is compatible with HDLPE at your concentration and temperature. Match the resin to your contents using the OEM chemical-resistance chart before committing the tank to anything beyond water, and extend that check to the flange gasket and fitting materials as well, since a buyer who clears the resin but runs an incompatible gasket still leaks at the connection. For containment-driven projects, walk the requirement through our guides on SPCC 40 CFR 112 compliance and Captor freeboard sizing per ASTM D1998, and review where vapor-side wall failures originate so your inspection routine covers the headspace, not just the wetted wall. For rural fire-water and reservoir duty, the NFPA 22 reservoir design guide covers sizing and freeze protection.
This Snyder double wall tank ships LTL with freight quoted live to your ZIP. Because it can originate from more than one plant, confirm the shipping origin to your ZIP before you order so the quote routes correctly. Get your number on the Freight Cost Estimator or call 866-418-1777, and our team will confirm lead time, fitting and vent layout, and delivery access for the 2500 gallon black Captor double wall tank before you order.
