The Snyder Industries 750 Gallon ASTM XLPE Black Double Wall Tank (SKU 5990902N48) is a black crosslinked linear polyethylene (XLPE) tank with double-wall construction: a primary tank nested inside a secondary containment shell, so a primary leak is captured rather than released. It holds 750 gallons, stands 67 inches tall on a 73 x 73 inch footprint, and carries a 1.9 specific gravity rating, which sets the weight of contents the tank is built to hold.
Will it work for your liquid?
Working volume is 750 gallons in the XLPE primary tank. On a double-wall tank you size to that 750-gallon primary; the secondary shell is overflow capture, not extra usable capacity, so do not plan around 750 gallons plus containment. The number that defines this tank is its 1.9 specific gravity rating. Plain water weighs about 8.34 pounds per gallon (specific gravity 1.0); this black tank is rated for contents up to 1.9 specific gravity, roughly 15.8 pounds per gallon. A full 750 gallons of water weighs about 6,255 pounds, while the tank's maximum rated contents weight is 11,884 pounds. At 1.9 SG the tank sits at that rated weight limit, so buyers running near-water densities have full margin, and anyone approaching 1.9 should not exceed it. Run your liquid through our Tank Sizing Calculator or read the Tank Sizing Guide before you order.
Fittings, access, and the pad it sits on
This tank is documented with two openings: an 18-inch polyethylene threaded and vented top fitting and a manway with 15-inch access for entry, inspection, and cleaning of the primary. Verify your fill and vent connections mate to that 18-inch threaded fitting and that your access and monitoring hardware fits the 15-inch manway opening - these are the only two openings the data documents, so anything else is a field modification. Confirm gasket and seal material for your liquid against the technical drawing on this page rather than assuming it. Because the 1.9 SG rating is the limiting weight case, set this tank on a level pad rated for the full 11,884-pound loaded weight, not the 6,255-pound water figure.
Plan your leak detection before installation
On a double-wall tank the interstitial space - the gap between the primary and secondary walls - is the heart of your leak-detection strategy. Note that a built-in interstitial monitor is not a documented fitting on this tank: the only listed access is the 15-inch manway on the primary, so confirm the secondary-wall monitoring port on the technical drawing rather than assuming one is included. The 1.9 specific gravity rating governs the weight of the contents, not chemical compatibility, so match your liquid's actual specific gravity to the 1.9 ceiling and confirm chemical suitability separately. If you are pushing the density envelope or running double-wall containment, the Snyder Captor double-wall freeboard sizing guide and the ASTM D1998 wall-thickness discussion are worth reading first. Buried-outer-wall installs should also review our cathodic disbondment testing notes.
This double-wall tank ships LTL freight from the Snyder plant in Chowchilla, California, and freight is quoted live to your ZIP code - get your number from the Freight Cost Estimator or call us at 866-418-1777. Tell us your delivery ZIP and whether you need a liftgate or limited-access delivery and we will lock in your rate.
