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Tank Solutions – FuelUnderground fuel storage tanks
Double-wall underground fuel storage tanks (USTs) in fibreglass (FRP) and Glasteel® II steel with FRP containment, for service stations, fleet depots and AdBlue, from 2,000L to 200,000L. We build to your spec, including deeper burial and higher head pressure than standard. Underground tanks are installed by accredited installers. See what AS 1692 covers.
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Tell us roughly what you need. A sales engineer for your state replies within 2 business days.
Have drawings or a full spec? Use the detailed quote form, or call NSW +61 2 4964 8270 or WA +61 8 9434 1707.
Underground storage tank range
Double-wall fibreglass fuel tanks
Double-wall FRP tank with 360-degree secondary containment.
FRP single-wall underground tanks
Lightweight FRP tank, delivered complete and ready to install.
Glasteel® II underground fuel tanks
A welded mild steel tank with an FRP outer layer that provides secondary containment, leak protection and corrosion resistance.
Service station fuel tanks
Double-wall FRP underground fuel tanks for new service stations, upgrades and replacements, with full 360-degree secondary containment.
AdBlue storage tanks
Underground FRP tanks for AdBlue (diesel exhaust fluid), in single or double-wall, as a stand-alone tank or a compartment alongside other fuels.
What is an underground storage tank?
An underground storage tank (UST) is a tank buried below ground, most often to hold diesel, petrol or AdBlue at a service station, truck stop or depot. Going underground frees up the site above, keeps fuel away from vehicles and the public, and holds the product at a relatively low, stable temperature.
A leak can reach soil and groundwater before anyone sees it. That is why our fuel USTs are double-wall, with the space between the walls monitored for leaks.
Double-wall containment and leak monitoring
A double-wall tank has a primary wall that holds the fuel and a secondary wall around it. If the primary wall ever leaks, the outer wall contains the fuel, and the monitoring on the interstitial space between the walls shows it.
360° secondary containment
The outer wall completely surrounds the primary wall, so a leak is held in the tank instead of reaching groundwater.
Hydrostatic monitoring on FRP
On double-wall FRP tanks, Truchek® keeps the interstitial space filled with brine, and a reservoir on top of the tank holds it at a set level. It gives continuous leak detection, lets the owner do a visual tank tightness test and meets EPA requirements.
Vacuum monitoring on Glasteel® II
Glasteel® II tanks leave the factory with a vacuum gauge fitted to the interstitial space, so the tank’s integrity can be monitored.
No corrosion to manage
Fibreglass doesn’t rust, inside or out. On Glasteel® II the FRP outer wall resists corrosion, so the steel tank needs no cathodic protection.
Separate compartments
Double-wall FRP tanks come with 1 to 4 separate compartments, with integral double internal walls between them.
Fuel compatibility
Double-wall FRP tanks are warranted for petrol, diesel, ethanol blends to E85, biodiesel to B20 and jet fuel at ambient temperature, and are compatible with AdBlue.
Which underground tank do I need?
For fuel, the choice is mostly between a double-wall FRP tank and Glasteel® II, a welded steel tank fully enclosed in an FRP outer wall so the steel never touches soil or groundwater. Both are double-wall and both are installed by accredited installers.
| If you need | Choose | Why |
|---|---|---|
| Full secondary containment for fuel, with no corrosion |  Double-wall FRP tank | 2,000–150,000L to UL 1316 for fibreglass tanks, with Truchek® leak monitoring, up to 4 compartments and a 30-year corrosion warranty. |
| A steel structural tank with FRP containment |  Glasteel® II tank | 2,000–200,000L under STI licence. The FRP outer wall removes the need for cathodic protection. |
| A new service station, upgrade or replacement |  Service station tank | Double-wall FRP up to 150,000L to UL 1316, with compartments so several grades share one excavation. |
| AdBlue storage, alone or beside diesel |  AdBlue tank | Kept cool underground, as a stand-alone tank or one compartment of a fuel tank. |
| A light tank where containment isn’t required |  FRP single-wall tank | Lighter, delivered complete and quick to install. Holds fuels, AdBlue or water, depending on the application. |
Service station USTs
We supply underground tanks for service station new builds, upgrades and replacements of tanks that have passed their serviceable life. A service station tank is double-wall FRP up to 150,000L, built to UL 1316, with compartments so several grades share one tank and one excavation.
What a forecourt usually needs
- Double-wall tanks with interstitial leak monitoring
- Separate compartments for unleaded, premium, diesel and AdBlue
- Tanks rated for ethanol blends and biodiesel
- FRP risers, with 1,200 mm collars standard on pressure systems
- Installation and testing by an accredited installer
Pair it with
- An Aquator® oil–water separator for forecourt runoff
- An AdBlue compartment or tank beside the diesel
- Our guide to service station tanks
Australian Standards for underground fuel tanks
The standards that apply to underground fuel tanks, and where our range fits. AS 1692 is written for steel tanks, so fibreglass tanks are built to UL 1316 instead.
| AS 4897 | The design, installation and operation of underground petroleum storage systems. It calls for non-corroding tanks and pipework, secondary containment and overfill protection. Double-wall FRP tanks get a third-party tank test after installation to AS 4897, using USEPA methods. |
|---|---|
| AS 1940 | The storage and handling of flammable and combustible liquids. Underground tank venting must comply with Section 5.4. See our AS 1940 guide. |
| AS 1692 | Steel tanks for flammable and combustible liquids, above and below ground. Glasteel® II tanks are manufactured to AS 1692 and UL 58. See what AS 1692 covers. |
| UL 1316 | Glass-fibre-reinforced plastic underground storage tanks for petroleum products. Our double-wall FRP tanks are manufactured to meet or exceed it. |
General information only, not compliance advice. Your state regulator and site engineer set what applies to your site.
Replacing an old underground tank
If your site still runs an older single-wall steel tank, a double-wall replacement adds secondary containment and leak monitoring. Taking the old tank out of service and assessing the site follow your state EPA’s guidance for underground petroleum storage systems (UPSS). Send us the site plan and the grades you store and we’ll build the new tank and compartments to your spec. See what’s involved in replacing a service station tank.
Underground or above-ground?
Underground suits sites where space, traffic and appearance matter, such as service stations and busy depots, and keeps AdBlue cool. An above-ground fuel tank needs no excavation, and a self-bunded tank can be moved later, which suits farms, mines and construction sites.
Watch an underground install
A time-lapse of underground fuel tanks going into a service station, from excavation and shoring to craning the tanks in and backfilling. Each step follows our installation manual.
- Installed by an accredited installer; a non-accredited install voids the warranty
- Backfilled and anchored to our installation manuals, including the out-of-hole tie-down system
- Up to 2.1 m of cover on double-wall FRP; at least 600 mm in a dry hole with no traffic, or 1,000 mm with traffic
- Double-wall FRP tanks tested by a third party after installation to AS 4897
Photos
Common questions
Can’t see yours? Call NSW +61 2 4964 8270 or WA +61 8 9434 1707.