The Snyder Industries 275 Gallon Double Wall Tank is built from black high-density linear polyethylene, carries a 1.9 specific gravity rating, and stands 63 inches tall on a 47 x 47 inch footprint. The double-wall construction puts a primary tank inside a secondary shell, so a leak in the inner wall is caught by the outer wall instead of reaching your floor or ground. This is the tank to specify when you want secondary containment in a compact footprint and a unit that ships ready to plumb.
Capacity: 275 gallons · Footprint: 47 x 47 in · Height: 63 in · Material: black HDPE (high-density linear polyethylene) · SG rating: 1.9 · Ships from: Marked Tree, AR - LTL freight quoted live to ZIP.
Will it work for your application
Capacity is 275 gallons. Filled with water at standard density the contents weigh 2,294 pounds, and at the tank's 1.9 specific gravity rating the maximum rated contents weight at full volume is 4,358 pounds. Rated to 1.9 specific gravity, this shell carries far more than water weight, so it has headroom if your contents run denser than water. Size your pad, anchoring, and any equipment stand to the loaded figure, not the empty shell: at full rated load that 4,358 pounds sits on a 47 x 47 inch (roughly 2,209 square inch) square footprint, which keeps the unit tight against a wall or inside a bermed area. For matching gallons to your draw and refill cycle, run the numbers through our Tank Sizing Calculator and read the Tank Sizing Guide before you commit to a size.
Fittings and access
Two top openings ship on this tank:
- 18-inch PE threaded and vented port for fill and venting.
- Manway with 15-inch clear access for entry, inspection, and interior cleaning.
See the technical drawing on this page for fitting placement and elevations so you can plan your fill and vent runs before delivery. Because this is a double-wall HDPE tank, the interstitial space between the inner and outer walls is part of how the unit protects against release - the guide on interstitial space and the polyethylene boundary condition covers how that annulus behaves.
Sizing the usable volume - the mistake to avoid
The biggest mistake on a double-wall tank is treating the 275-gallon rating as the volume you can actually fill day to day. Usable working volume sits below the 275-gallon nameplate because polyethylene tanks reserve freeboard for thermal expansion of the contents. Our guide on Snyder Captor double-wall freeboard sizing walks through density and thermal expansion so you know the real working volume, and the companion piece on HDPE wall thickness at the vapor-saturated headspace explains why the area above the liquid line deserves attention during inspection.
This Snyder double-wall tank ships LTL from the Snyder plant in Marked Tree, Arkansas, with freight quoted live to your ZIP - get your number from the Freight Cost Estimator or call 866-418-1777 to confirm fittings, the technical drawing, and delivery before you order.
