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Watco Permatank Outside

STI PERMATANK® Triple Wall

Our Permatank® Triple Wall represents a breakthrough in fuel storage technology, offering tertiary containment for maximum environmental protection. Approved by Texas in 2011, this advanced system meets STI Permatank® specifications and complies fully with TCEQ requirements, making it ideal for environmentally sensitive areas like the Edwards Aquifer. Complete with STICO Mutual’s 30-year limited warranty.

WATCO TANKS

PERMATANK® Triple Wall Features:

Triple-Wall PNG

 

  • Advanced Triple Wall Containment: Tertiary corrosion resistant wall featuring Watco’s Next Generation Permatank jacketed design meets UL 58, UL 1746 and ULC‐5603.1
  • All tanks are proven tight throughout installation, via third-party certification, by interstitial vacuum test – 13 inches Hg minimum
  • Provides many options to meet EPA leak detection requirements for interstitial monitoring
  • Steel provides complete compatibility with all blends of ethanol and biodiesel fuels
  • Impermeable to all petroleum products and vapors
  • Designed shorter than corrosion-resistant material tank of the same capacity, reducing the cost of installation and increasing site layout flexibility

Meets EPA Leak Detection Requirements for Underground
Storage Tanks

Watco Tanks Strength in Layers

Triple Wall Steel Tank

Advanced Triple Wall Containment: Tertiary corrosion resistant wall featuring Watco’s Next Generation Permatank jacketed design,
meets UL 58, UL 1746 and ULC‐5603.1

Triple-Wall Layers (2)

Additional Features:

  • Designed shorter than corrosion-resistant material
    tanks of the same capacity, reducing the cost of
    installation and increasing site layout flexibility
  • Features a durable non-slip grip application on top of tank to ensure OSHA safety compliance
  • Complete with STI's 30-year limited warranty
  • Capacities range up to 40,000 gallons with braced double bulkhead

Permatank® Triple Wall Benefits:

  • Double and triple-wall construction
  • Various backfill options allow for money-saving installation
  • Low-cost compartments and customization
  • Built to nationally-recognized STI Standards with
    strict third-party quality control inspection program
  • Double bulkheads as standard
Triple Wall (1)
Slice 3 (76)
Protect The Environment - Buy Recyclable Steel Tanks
Compatible with a wide range of fuels and chemicals, including biodiesel and ethanol
Watco Tanks

Permatank® Triple Wall Underground Steel Storage Tanks

  • Steel Tank Institute Permatank® and UL Labeled
  • Compatible with alternative fuels
  • Low-cost compartments and customization
  • Flat ends reduce installation costs
  • Provides safe and effective secondary containment
  • Capacities range up to 40,000 gallons with braced double bulkhead
STI Permatank Underground Install

Permatank® Triple Wall Guideline Specification

 
General
  1. Provide Permatank® double‐wall jacketed steel‐fiberglass underground storage tanks.

Labeling
  1. Tanks shall bear the Steel Tank Institute Permatank® label.
  2. Underground tanks shall bear the appropriate Listing label.

Manufacturer
  1. Manufacturer shall be a licensed member company of the Steel Tank Institute and subject to Steel Tank Institute’s Quality Assurance program.
Product Description
  1. Tanks shall be manufactured per Steel Tank Institute Specification for Permatank®.
  2. Tanks shall be manufactured and listed following Underwriters Laboratories UL 58, Steel
    Underground Storage Tanks for Flammable and Combustible Liquids and UL 1746, External Corrosion
    Protection Systems for Steel Underground Storage Tanks or ULC‐S603.1, Standard for Corrosion Protection
    for Steel Underground Tanks for Flammable and Combustible Liquids.
  3. All tanks shall provide testable secondary containment and access for interstitial leak detection monitoring.

Trusted Watco Tanks Affiliates

Watco Tank Manufacturing Shot

Top U.S. Producer of STI Technologies

Watco Tanks was recognized as the largest U.S. producer of STI Technologies in 2021 and the second-largest worldwide, with over 5 million gallons built in 2021 and over 6 million gallons each in 2022 and 2023.

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