Snyder Industries 750 Gallon ASTM XLPE Double Wall Tank

The Snyder Industries 750 Gallon ASTM XLPE Double Wall Tank (SKU 5990902N42) is a tank-within-a-tank storage unit molded from crosslinked linear polyethylene (XLPE). The inner tank holds 750 gallons; the integral outer tank provides secondary containment, so there is no separate berm or vault to pour. At 73 inches wide by 73 inches deep and only 67 inches tall, it is a low-profile, wider-than-tall unit that favors sites with height restrictions over narrow pads. It weighs about 6,255 pounds full of water and is molded in natural white. This page covers what it holds, how it ships, and the one sizing detail that trips up first-time double-wall buyers.

Will this XLPE double wall tank fit your site?

Capacity is 750 gallons inside the inner tank, on a 73.0 x 73.0 inch footprint with an overall height of 67 inches, so check your pad and any doorway or roll-up clearance against those numbers before you order. The tank carries a specific gravity rating of 1.9, meaning the structure is rated to hold contents up to 1.9 times the density of water. Filled with plain water (SG 1.0), the contents alone weigh about 6,255 pounds; at the full 1.9 SG rating the contents can reach roughly 11,884 pounds. Spec your foundation and any anchoring for the actual density of what you plan to store, not the water figure. If you are not sure how the gallon figure maps to your draw-down and refill schedule, run the numbers through the Tank Sizing Calculator or read the Tank Sizing Guide first.

Why the double wall (and the 1.9 SG rating) matters

The secondary outer wall exists to contain the inner tank's contents if the primary ever leaks, which is the entire point of a double-wall installation. Before you specify, confirm the outer-tank containment volume meets your jurisdiction's secondary-containment requirement (commonly 110% of the inner tank) by calling us at 866-418-1777. The 1.9 specific gravity rating is genuine headroom: this unit is over-built for plain water (SG 1.0), so the same tank handles dense solutions up to 1.9 times water's density without a spec change, which leaves you room to repurpose it for heavier service later instead of re-tanking. Fitting and port configuration is set at order, so call 866-418-1777 with your inlet, outlet, vent, and fill requirements and we will confirm the unit is plumbed to your layout. The technical drawing on this page shows the as-molded dimensions.

The mistake to avoid: freeboard and density

The most common error on a 750-gallon double-wall tank is filling it to the brim and ignoring expansion headroom. Per ASTM D1998 design logic, you size for freeboard so the contents have room to thermally expand and so you are not riding the structural limit of the wall. Two of our guides walk through this directly: Snyder Captor double-wall freeboard sizing per ASTM D1998 explains the real volume you can actually use, and HDPE tank wall thickness at the vapor-saturated headspace covers where premature failures originate. If you are spec'ing this XLPE tank for fire-water reserve or a cold-climate site, the Fire-Water Reservoir Tank Design guide adds NFPA 22 sizing discipline and freeze-protection notes.

This Snyder XLPE double wall tank ships LTL freight, quoted live to your ZIP, from the Snyder plant in Chowchilla, CA. Because it is a large, heavy unit, get an exact freight number before you commit: enter your ZIP in the Freight Cost Estimator for a live quote, or call us at 866-418-1777 and we will work it out with you. Listed price is before freight.