150 Gallon Double Wall Containment Tank, 36" Dia x 60"H, 14" Threaded Manway

The 150 Gallon Double Wall Containment Tank (36" Dia × 60" H with 14" Threaded Manway) is a heavy-duty, point-of-use secondary containment chemical storage vessel engineered for large commercial aquatic facilities, municipal water treatment systems, waterparks, and high-demand chemical feed setups.

Featuring a broader 36-inch diameter base and a lower center of gravity compared to narrower 34-inch vertical profiles, this model provides increased stability for high-volume dosing environments. Its integrated closed-annular "tank-within-a-tank" structure satisfies EPA (40 CFR 264.175) and OSHA secondary containment standards without the footprint or expense of external concrete curbs, secondary sumps, or containment pans. It serves as primary bulk storage for high-demand chemicals such as liquid sodium hypochlorite (12.5% to 15%), muriatic acid (31.45%), sulfuric acid, sodium bisulfate, and liquid coagulants.

Mechanical & Structural Architecture

• Integrated Secondary Containment (115% to 120% Buffer): The outer containment envelope provides 115% to 120% capacity relative to the primary inner vessel. In the event of primary vessel mechanical rupture, stress cracking, or thermal fatigue, the full liquid volume is safely retained within the interstitial space, preventing chemical release onto equipment room pads.

• Rotomolded Monolithic Construction: Seamlessly molded as a single monolithic unit using virgin High-Density Linear Polyethylene (HDLPE) or High-Density Cross-Linked Polyethylene (XLPE). Monolithic rotational molding eliminates welded seams, joints, and stress risers vulnerable to chemical attack and cyclic hydraulic loading.

• High Specific Gravity Rating (1.5 to 1.9 SG): Formulated with heavy-wall construction rated to handle high-density fluids up to 1.9 Specific Gravity, safely holding dense 12.5%–15% sodium hypochlorite (~1.20–1.22 SG) and 31.45% muriatic acid (~1.16 SG) without sidewall bulging.

• 14" Threaded Access Manway: Features an oversized 14-inch threaded polypropylene access lid with an integrated pressure-relief vent. The wide diameter allows easy internal visual inspection, drop-tube installation, and manual hose filling, while the breathable labyrinth/membrane vent relieves oxygen gas released from decomposing sodium hypochlorite and prevents vacuum collapse during high-rate dosing.

• Broad Top-Mount Equipment Flats: The 36-inch top dome provides a wide, rigid platform with molded flat landings to anchor commercial electronic diaphragm metering pumps, peristaltic feeders, level-sensor transmitters, and rigid top-draw suction lances directly on the vessel.

• Visual Fluid Inventory Tracking: Molded in natural translucent polymer with raised gallon and liter graduation marks down the exterior sidewall, allowing operators to visually check chemical inventory levels without unthreading the access lid.

Technical Specifications

• Nominal Primary Volume: 150 US Gallons (approx. 568 Liters).

• Secondary Outer Volume: Approx. 175 to 180 US Gallons ($>115\%$ containment capacity).

• Overall Exterior Dimensions: 36" Outer Diameter × 60" Overall Height (approx. 91.4 cm Dia. × 152.4 cm H).

• Access Manway: 14" threaded polypropylene access lid with integrated pressure-relief breather.

• Specific Gravity Rating: Standard 1.5 SG (dilute acids/water) or Heavy-Duty 1.9 SG (concentrated bleach/acids).

• Operating Temperature Limits: -20°F to 120°F (-29°C to 49°C) continuous service.

• Fittings & Port Landings:

  • Top-dome flats accommodate up to three 2" NPT female bulkhead adapters (for top-draw suction lances, chemical fill lines, and interstitial leak detection float switches).

  • Top-draw plumbing architecture standard to prevent gravity drainage or siphon leaks.

Chemical Compatibility Reference

• Sodium Hypochlorite (12.5% – 15%): Fully compatible. The 14" vented threaded cap allows continuous dissipation of decomposing oxygen gas.

• Muriatic Acid (Hydrochloric Acid, 28% – 31.45%): Fully compatible. Sealed top-draw piping isolates corrosive fumes from mechanical room equipment.

• Sulfuric Acid (up to 50% concentration): Fully compatible under ambient equipment room conditions.

• Liquid Coagulants & Polyaluminum Chloride (PAC): Fully compatible; smooth non-stick interior minimizes polymer film buildup.

Weight and Logistics Profile

• Dry Tare Weight: Approximately 115 to 145 pounds (approx. 52.2 to 65.8 kg) empty, depending on wall thickness (1.5 SG vs. 1.9 SG).

• Full Fluid Operating Weight:

  • Filled with Water (1.0 SG): Approx. 1,365 to 1,395 lbs (approx. 619 to 633 kg).

  • Filled with 12.5% Sodium Hypochlorite (1.2 SG): Approx. 1,615 to 1,645 lbs (approx. 733 to 746 kg).

• Shipping Dimensions: Palletized freight footprint of approximately 38" L × 38" W × 65" H.

• Doorway Clearance Note: Requires a minimum clear doorway rough opening of 37 inches (standard 36-inch doors may require door-stop removal or diagonal entry depending on jamb design).

• Logistics Handling: Ships via LTL Motor Freight (Class 150 to 250 based on dimensional volume) shrink-wrapped and secured with heavy-duty corner edge protectors.