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Watco Permatank Outside

STI PERMATANK®

PERMATANK® double-wall jacketed underground storage tank features an inner steel tank coupled with an exterior corrosion-resistant coating. A unique standoff material separating the inner and outer tanks creates a uniform interstitial space ensuring rapid and accurate leak detection.

WATCO TANKS

PERMATANK® Features:

AnnotatedTankModel

 

  • 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

STI Permatank® New and Improved Steel Jacket Design

The double-wall jacketed underground storage tank features a one-of-a-kind jacketed wrap that separates the inner tank and outer jacket, creating a uniformly tight tank with rapid and accurate leak detection.

Watco Steel Seperator Material Annotated

Additional Features:

  • Designed shorter than corrosion-resistant material
    tanks of the same capacity, reducing the cost of
    installation and increasing site layout flexibility
  • Capacities range up to 40,000 gallons


Permatank® 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
STI Permatank
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® Double-Wall Jacketed 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
STI Permatank Underground Install

Permatank® 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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