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Underground Storage Tanks
Newberry underground storage tanks are double-wall steel tanks built for the long-term underground storage of fuel, diesel, gasoline, and petroleum products. Both product lines pair a structural steel inner tank with a corrosion-resistant outer wall and an interstitial space for continuous leak detection, and both are manufactured to Steel Tank Institute standards under third-party quality-control inspection. Capacities run from 2,000 to 30,000 gallons. Two lines cover the range of underground applications. The Permatank is a jacketed steel tank with a fiberglass outer wall, listed to UL 58, UL 1746, and ULC-S603.1. The ACT-100 is a steel tank clad in an FRP composite coating with a 100-mil minimum thickness, listed to UL 58 and UL 1746. Both are compatible with all blends of ethanol and biodiesel, impermeable to petroleum products and vapors, and meet EPA leak detection requirements for underground storage tanks.
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Permatank vs ACT-100 (comparison table)
| Comparison | Permatank | ACT-100 |
|---|---|---|
| Construction | Steel inner tank, jacketed with a fiberglass (FRP) outer tank | Steel tank clad in FRP composite coating, 100-mil minimum |
| Corrosion protection | Fiberglass outer wall over standoff material | Spark-tested FRP laminate, 15,000 volts, holiday-free |
| Listings | UL 58, UL 1746, ULC-S603.1 | UL 58, UL 1746 |
| Leak detection | Pressure tested; interstitial space monitored | Pressure tested; interstitial space monitored |
| Capacity range | 4,000 to 30,000 gallons | 2,000 to 20,000 gallons |
| Warranty | 10-year, extendable to 30-year, STI/STICO backed | 10-year, extendable to 30-year, STI/STICO backed |
| Best for | Largest capacities (to 30,000 gal) and ULC / Canadian-code sites | Installations within its 2,000 to 20,000 gal range |
Permatank
The Permatank is a double-wall jacketed underground storage tank: a structural steel inner tank coupled with a corrosion-resistant fiberglass outer tank, separated by a standoff material that creates a uniform interstitial space for rapid, accurate leak detection. Listed to UL 58, UL 1746, and ULC-S603.1, and pressure tested, with openings that accept a wide range of EPA-compliant leak detection systems. Designed shorter than an all-FRP tank of the same capacity, which lowers installation cost and increases site-layout flexibility. Capacities up to 30,000 gallons.
ACT-100
The ACT-100 is a double-wall fiberglass composite underground storage tank: a steel primary tank encased in an FRP composite coating with a 100-mil minimum dry film thickness, spark-tested to 15,000 volts for holiday-free coverage. The steel shell carries the structural load while the fiberglass laminate forms a continuous dielectric barrier that isolates the tank from soil and stray-current corrosion. Listed to UL 58 and UL 1746, compatible with all blends of ethanol and biodiesel, and backed by a 10-year warranty extendable to 30 years. Flat-end design lowers installation cost. Capacities from 2,000 to 20,000 gallons.
Choosing an Underground Tank
Both lines meet the same core standards, so the choice usually comes down to capacity, site conditions, and code. For the largest capacities and Canadian-code (ULC) installations, the Permatank carries the wider range. Both tanks use a flat-end design, so the choice between them comes down to local code and site requirements rather than tank shape. To convert a fluid level into gallons for a given tank, use our tank chart calculator.
FAQ
What sizes do underground storage tanks come in?
Newberry underground storage tanks range from 2,000 to 30,000 gallons. The ACT-100 covers 2,000 to 20,000 gallons; the Permatank covers 4,000 to 30,000 gallons. Each capacity has published inner-tank dimensions and approximate weights on this page.
What is the difference between a Permatank and an ACT-100?
Both are double-wall steel underground tanks with interstitial leak detection. The Permatank is a jacketed steel tank with a separate fiberglass outer tank, listed to UL 58, UL 1746, and ULC-S603.1. The ACT-100 is a steel tank clad directly in an FRP composite coating of 100-mil minimum thickness, listed to UL 58 and UL 1746. The Permatank offers the larger capacity range; the ACT-100 offers a flat-end design and a warranty extendable to 30 years.
Are underground storage tanks compatible with ethanol and biodiesel?
Yes. Both the Permatank and the ACT-100 use a steel primary tank, which is compatible with all blends of ethanol and biodiesel and impermeable to petroleum products and vapors.
How do underground storage tanks detect leaks?
Both lines have an interstitial space between the inner and outer walls for continuous leak detection and monitoring. Permatanks are proven tight during installation by an interstitial vacuum test to a minimum of 13 inches Hg, and support a range of EPA-compliant monitoring systems.
Do Newberry underground tanks meet EPA requirements?
Yes. Both lines meet EPA leak detection requirements for underground storage tanks and use EPA-recognized corrosion-control technology.
What standards are underground storage tanks built to?
Newberry underground tanks are listed to UL 58 and UL 1746, built to Steel Tank Institute (STI-SPFA) standards under a mandatory third-party quality-control inspection program. Permatanks additionally meet the Canadian ULC-S603.1 standard.
What warranty comes with an underground storage tank?
The ACT-100 carries a limited product warranty of 10 years with registered purchase, extendable to 30 years total for an additional fee, backed by STI/STICO. Permatanks are built to the same STI third-party-inspected standards.