The Snyder Industries 250 Gallon ASTM Sodium Hypochlorite Double Wall Tank (SKU 5990502N52) is a double-wall HDPE tank rated for high-density liquids. It holds 250 gallons in a compact 34-inch by 34-inch footprint and stands 83 inches tall, molded in Natural White HDLPE resin (#880059) with a 1.9 specific-gravity rating. The double-wall construction gives you built-in secondary containment in a single unit, so a breach of the inner tank is caught by the outer shell rather than reaching the floor. For operators who need to verify the integrity of that outer boundary over time, the cathodic-disbondment testing guide covers the interstitial-space and outer-wall methodology in depth.
Will it work for your liquid?
The 1.9 specific-gravity rating is the number that matters here. It means the tank body is engineered to safely carry contents up to 1.9 times the weight of water. Fill it with plain water and you are carrying about 2,085 pounds; loaded to its full rated content weight the tank supports up to 3,962 pounds. That is a structural weight rating, not a compatibility statement. Before you commit, confirm your specific chemistry, concentration, and temperature against Snyder's chemical-resistance chart, and match every fitting and gasket to the same duty. Verify wetted materials for every port before you order.
Sizing, footprint, and freeboard
At 83 inches tall on a 34 x 34 inch base, this is a tall unit on a small footprint, so plan for a level pad and anchoring given the height-to-footprint ratio. Sizing a double-wall tank is also not just gallons-to-gallons: thermal expansion and freeboard rules under ASTM D1998 mean the volume you can actually use day to day is less than the nameplate capacity. Run your real numbers through the Tank Sizing Calculator and read the Tank Sizing Guide before you order. For the density and freeboard specifics on Snyder Captor-style double-wall tanks, the Captor double-wall freeboard sizing guide walks through the math, and the HDPE wall-thickness guide explains why the vapor-saturated headspace, not the liquid line, is usually where premature failures start.
The mistake to avoid
Do not undersize the specific-gravity rating or mismatch your hardware. The 1.9 rating protects the tank body, but a gasket or fitting material that is not rated for your service will fail long before the wall does. Confirm the drawing dimensions and fitting layout against your plumbing using the technical drawing on this page, and verify wetted materials for every port before install.
This double-wall HDPE tank ships LTL freight from Snyder's plant in Lincoln, Nebraska, and freight is quoted live to your ZIP rather than bundled into the list price. Get your freight quote to your ZIP with the Freight Cost Estimator, or call 866-418-1777 and we will quote it and confirm the right double-wall configuration for your application.
