The Snyder Industries 150 Gallon ASTM HDPE Double Wall Tank is a containment-built storage tank with a tank-within-a-tank design: a primary vessel held inside a secondary outer wall so a leak is caught instead of lost to the ground. It holds 150 gallons, stands 62 inches tall on a 34 x 34 inch footprint, and is molded from high-density linear polyethylene in natural white. Its specific-gravity rating is 1.9, which means the wall is built to carry contents up to 1.9 times the weight of water - a high rating that lets this tank hold dense chemistries a standard 1.5-rated double-wall tank cannot.
Will it work for your site?
Filled with water, this tank carries about 1,251 lb; at its full 1.9 specific-gravity rating it is built to hold up to 2,377 lb of contents. Plan your pad, anchoring, and floor loading around the heavier of those two numbers if you are storing anything denser than water. The 34 x 34 inch footprint and 62 inch height make it a tall, compact double wall tank that fits where floor space is tight. Use the Tank Sizing Calculator and the Tank Sizing Guide to confirm the 150-gallon working volume matches your draw and refill cycle, and remember that a double-wall containment tank needs freeboard for thermal expansion - the Snyder double-wall freeboard sizing guide walks through the real volume you can actually use under ASTM D1998.
Fittings and access
The technical drawing on this page labels a 14-inch PE threaded and vented fitting and a manway with 11-3/8 inch access for filling, inspection, and cleaning. Confirm the count and position of these openings against the technical drawing before you set the tank and plumb your lines, since a tall vessel like this is hard to re-orient once it is full. Match your bulkhead or threaded fitting and gasket to the molded PE thread shown on the drawing before ordering plumbing, so your seal seats correctly the first time. For double-wall units, the vapor-saturated headspace above the liquid is where wall thinning and premature failures tend to begin - the HDPE wall-thickness at the headspace guide explains why liquid-side inspection misses it.
The mistake to avoid
The 1.9 specific-gravity rating is the spec people skip. It is a structural ceiling, not a target: if your contents are denser than water, do the math on the 2,377 lb maximum-rated weight before you commit to a pad or platform. Undersizing the structure beneath a full HDPE double-wall tank is the failure that shows up later, not on day one.
This 150-gallon Snyder HDPE double-wall tank ships LTL from Marked Tree, Arkansas, with freight quoted live to your ZIP - get your number on the Freight Cost Estimator or call 866-418-1777. If this unit is headed for fire-water reserve service, the NFPA 22 fire-water reservoir guide covers the design discipline before you specify.
