The Snyder Industries 4500 Gallon ASTM XLPE Double Wall Tank is a fully integrated containment system for water and water-treatment storage where a single wall is not enough margin. The inner tank holds 4,500 gallons inside a second outer tank, so a breach in the primary shell is captured by the secondary instead of reaching the ground. It is molded from crosslinked linear polyethylene (XLPE) in Natural White and rated to a 1.5 specific gravity. That XLPE wall and the 1.5 SG rating are the two facts that decide whether this double wall tank is right for your contents.
Specs at a glance
- Capacity: 4,500 gallons (inner working volume)
- Dimensions: 197 in H x 102 in W x 102 in L
- Footprint: 102 x 102 in
- Full-water weight: ~37,530 lb
- Max rated contents weight: ~56,295 lb at 1.5 SG
- Material / color: Crosslinked linear polyethylene (XLPE), Natural White
- Ships LTL from Lincoln, NE
Will it work for your application?
The 4,500 gallon capacity is the inner working volume. Plain water weighs roughly 8.34 pounds per gallon, so a full inner tank carries about 37,530 pounds of water on the slab beneath that 102 x 102 inch footprint. The tank is rated to hold contents up to a 1.5 specific gravity, which works out to a maximum rated contents weight near 56,295 pounds for liquids heavier than water. Rated to 1.5 SG, this tank handles contents up to about 50% denser than water, so it covers many treatment chemicals and brines that a water-only (1.0 SG) tank cannot. Size the pad and any structural support for the heaviest contents you actually intend to store, not just for water, and confirm the bearing capacity under the full footprint. The Natural White wall also lets you gauge fill level visually. If you are working through working volume, freeboard, and usable capacity, the Tank Sizing Calculator and Tank Sizing Guide walk through it, and the Snyder Captor double-wall freeboard sizing guide covers how ASTM D1998, thermal expansion, and contents density cut into the volume you can actually use.
The mistake to avoid: XLPE is not HDPE, and watch the height
This is a crosslinked polyethylene (XLPE) double wall tank, not a linear HDPE tank, and the difference matters before you commit it to service. Crosslinked resin and the 1.5 specific gravity rating set the ceiling on what this tank can safely hold; do not exceed that 1.5 SG with a denser liquid, and do not assume chemical behavior from an HDPE data sheet. Because the inner and outer walls are molded as a containment pair, the interstitial space between them is part of the design and should stay clear so a leak in the primary is actually captured by the secondary. At 197 inches (about 16.4 feet) tall, confirm overhead clearance for fill and venting, and factor the height into freight routing. The guide on wall thickness at the vapor-saturated headspace explains why failures often start above the liquid line where routine liquid-side inspection misses them. For buried double wall installations, the cathodic disbondment testing guide (ASTM G8, G42, and G80) covers the interstitial space and the polyethylene boundary condition.
Fire-water and reserve storage
A double wall white XLPE tank at this volume is a common fit for fire-water reserve and rural water supply, where the secondary containment protects against a slow loss of the reservoir you are counting on. The fire-water reservoir design guide walks through NFPA 22 sizing discipline, the role of a polyethylene tank in a private fire-protection stack, and freeze protection for cold-climate sites. For dimensional detail on this tank, see the technical drawing on this page.
This tank ships LTL freight from the Snyder Industries plant in Lincoln, Nebraska, with freight quoted live to your ZIP. Get a freight estimate with the Freight Cost Estimator, and factor the 197 in height into over-height routing for a tank this size. Fitting configuration is quoted per order — call 866-418-1777 to confirm inlet/outlet, vent, and fill-port placement, lead time, and the best routing before you order.
