The Snyder Industries 6500 Gallon ASTM Black Double Wall Tank (SKU 5670000N49) is a polyethylene double wall tank built for bulk water and high-density liquid storage where secondary containment matters. It measures 120 inches wide by 120 inches long and stands 199 inches tall - roughly a 10-foot square footprint carrying a shell nearly 16.5 feet high - and holds 6,500 gallons with an integral outer wall that gives you built-in containment without a separate poured basin. This Snyder double wall black tank is rated to a specific gravity of 1.5, so it carries liquids substantially heavier than water.
Will it work for your site?
Plan the pad around the load, not the empty shell. Filled with water, this tank puts roughly 54,210 lb on the ground; at its full 1.5 specific gravity rating the contents can reach about 81,315 lb, and that 81,315 lb figure is the hard ceiling - SG 1.5 is the top of the rating, and anything denser is out of spec for this shell. That combined weight drives your foundation design more than any other number here, so size a level, continuously supported concrete pad to the max rated figure. The square 10-foot base carries a tall vessel, so a flat, fully bearing pad matters even more than usual - confirm your placement with the Tank Sizing Calculator and the Tank Sizing Guide. Because the 1.5 SG rating means you are not limited to water, our Snyder double-wall freeboard sizing guide walks through how ASTM D1998 freeboard and liquid density affect the volume you can actually use.
Fittings and access
Per the technical drawing on this page, this double wall tank comes configured with:
- Flange
- 18" PE threaded/vented fitting
- Manway w/ 15" access
Reference the technical drawing on this page for the exact fitting locations, elevations, and orientations before you plumb the site, since the vented-fitting placement matters for a closed containment system. Note that at 199 inches tall, the top manway and the 18-inch fill fitting sit about 16.5 feet up - plan a ladder or platform and a fall-protection routine for entry and inspection. Gasket and bulkhead-fitting selection for the flange and the 18-inch penetration should match your fluid and the drawing's fitting spec, so confirm those details from the technical drawing before ordering seals. For cold-climate and fire-reserve installations, the HDPE wall-thickness and vapor-headspace guide and the NFPA 22 fire-water reservoir design guide are worth reading during layout.
The mistake to avoid
The common error on a double wall tank this size is treating it like a single-wall vessel and skipping the interstitial space in your inspection plan. Because the outer wall is your secondary containment, you want a monitoring and inspection routine for that annular space, not just the primary shell. If you are burying or partially burying an outer wall, review our cathodic disbondment and interstitial-space guide before finalizing the install.
This tank ships LTL freight from the Snyder plant in Lincoln, NE, and freight is quoted live to your delivery ZIP - get an exact number with the Freight Cost Estimator or call our team at 866-418-1777. For a 6,500 gallon double wall unit at this footprint, confirm delivery access and offload equipment before you order, and we will help you spec the right rigging for the drop.
