The Snyder Industries 5000 Gallon ASTM Black Double Wall Tank (SKU 5630000N51) is a containment-grade vessel built from high density linear polyethylene, rated to a 1.9 specific gravity and measuring 216 in tall by 102 in wide by 102 in long. Its double wall construction seats a primary tank inside a secondary containment shell, so a breach in the inner wall is caught by the outer wall rather than reaching the ground, and the annular interstitial space between the two walls is where you monitor and inspect for a primary-wall leak. That makes it a working answer for operators who need secondary containment without pouring a concrete dike, whether the job is a fire-water reservoir, a bulk water store, or a black double wall tank on a site that requires interstitial protection. It ships from Lincoln, NE, LTL freight quoted live to your ZIP — get a number with the Freight Cost Estimator before you finalize.
Will this tank work for your site?
Filled with water this tank carries roughly 41,700 lb, and its structure is rated to hold contents weighing up to 79,230 lb at the 1.9 specific gravity limit — treat the water figure as your pad-design number and the 1.9 rating as structural headroom, not an invitation to fill it with denser chemistry. Set the foundation for the loaded weight and confirm ground bearing before delivery. The clean dimensional block is 216 in H x 102 in W x 102 in L on a square 102 x 102 in footprint, so verify overhead clearance and level grade for a tall, heavy vessel. Use the Tank Sizing Calculator and the Tank Sizing Guide to match usable volume to your draw rate, and remember that ASTM D1998 freeboard means the printed gallon rating is not all usable liquid volume.
Fittings and access
Per the technical drawing on this page, this tank is equipped with:
- Flange
- 18 in polyethylene threaded and vented fitting
- Manway with 15 in access for interior entry and inspection
Confirm exact port sizes, locations, and elevations against the drawing before you plumb the site, since inlet, outlet, and vent placement drive pipe routing and pump layout. The black exterior helps limit light transmission into the stored water.
Sizing and design references
Because this is a double wall vessel sized under ASTM D1998, the freeboard and wall-thickness behavior are worth understanding before you finalize the order. Our guide on Snyder Captor double-wall freeboard sizing per ASTM D1998 covers the real usable volume math, and the piece on HDPE wall thickness at the vapor-saturated headspace explains where premature failures originate. For rural fire protection duty, the fire-water reservoir design guide walks through NFPA 22 sizing and freeze protection, and if the outer wall interfaces with buried steel, the cathodic disbondment testing overview covers coating adhesion on that boundary.
The mistake to avoid
The common error on a tank this size is under-planning the pad and the freight. This is a tall, square-footprint double wall unit, and its 1.9 specific gravity rating does not mean you should treat the printed capacity as fully usable — the ASTM D1998 freeboard is real. Set the foundation for the loaded weight, keep the vessel plumb, and route your fittings from the drawing rather than from assumption.
This tank ships LTL, freight quoted live to your ZIP, from the Snyder plant in Lincoln, NE. Get a freight quote with the Freight Cost Estimator or call 866-418-1777 to confirm access, liftgate needs, and lead time before you order.
