The Snyder Captor 3000 Gallon double-wall tank pairs a crosslinked polyethylene (XLPE) primary vessel inside a full secondary containment shell, rated to a specific gravity of 1.9. It stands 142 inches tall on a 102 x 102 inch footprint, holds 3,000 gallons in the primary, and weighs roughly 25,020 lb full of water, with a maximum rated contents weight of 47,538 lb at its full SG rating. If you are sizing a black XLPE double wall tank from Snyder for bulk storage that needs built-in containment, this is the unit those specs describe.
Will it work for your install?
The primary tank is molded from crosslinked linear polyethylene in black, which blocks light and resists UV better than a translucent wall. The 1.9 specific gravity rating means the wall is built for dense contents up to 1.9 times the weight of water, not just water at 1.0 — real future-proofing if a water install later converts to a heavier brine or chemical service, because the same vessel handles those denser liquids without buying a new tank. Size your pad and foundation around the loaded numbers: about 25,020 lb full of water, and up to 47,538 lb at the maximum rated contents weight. Before you commit anchor points, do a clearance check against the exact dimensions — 102 x 102 inch footprint, 142 inches tall — so you confirm pad size, gate and door clearance, and overhead access for setting the tank. Run the Tank Sizing Calculator and Tank Sizing Guide to confirm capacity and freeboard against your actual fill level.
Fittings, access, and seals
Per the technical drawing on this page, this tank is configured with a flange, an 18-inch PE threaded/vented fitting, and a manway with 15-inch access. Verify every fitting size and elevation against the technical drawing before you plumb the inlet, vent, and outlet, and confirm the manway access opening clears whatever gauge, mixer, or inspection gear you intend to pass through it. The drawing does not specify seal or gasket material, so match every flange seal and manway gasket to your stored liquid before plumbing. On a double-wall unit, also confirm how the 18-inch vented fitting and any overflow route relative to the secondary containment shell — a vent or overflow that bridges or defeats the containment annulus undermines the entire reason to buy a double-wall tank.
The mistake to avoid
The single most common error on a double-wall containment tank is treating the freeboard the same as a single-wall water tank. Your real usable volume versus the nominal 3,000 gallons depends on how you size the fill line — read the Captor freeboard sizing guide, which walks through the ASTM D1998 sizing logic, before you set a fill line. If your install falls under spill containment rules, the SPCC 40 CFR 112 walkthrough covers how this tank's secondary containment fits a compliance plan, and the vapor-headspace wall-thickness guide explains where premature failures actually start.
This Snyder Captor tank ships LTL freight, with origin confirmed at quote time — Snyder records ship points in both Nebraska and West Virginia, so your ZIP is matched to the nearer plant when you price it. Get your live number from the Freight Cost Estimator or call 866-418-1777. For fire-water reservoir or remote-site planning, the NFPA 22 reservoir design guide is a good next read before you finalize the order.
