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Fibreglass (FRP) tanks

Fibreglass reinforced plastic is our material for underground fuel, chemical storage and water. This guide explains how FRP tanks are built, why you would choose fibreglass, and when steel or Glasteel® II suits better.

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How an FRP tank is built

An FRP tank is a laminate of glass and resin. The resin and the wall design change with what the tank holds.

  • Fuel tanks use virgin resins and glass with no fillers, with ribs formed into the wall for strength
  • Double-wall fuel tanks add Parabeam 3-dimensional fibreglass to both walls
  • Chemical tanks use a resin system selected for the chemical and concentration stored, with a smooth glass-resin interior
  • Water tanks use premium resin without fillers and integral high-profile fibreglass ribs
  • Sewage pump stations are laminated in one piece from premium-grade vinyl ester resin and glass

Every tank is built to order at our ISO 9001 factories in Tomago NSW and Kwinana Beach WA.

Large ribbed double-wall FRP underground fuel tank ready for dispatch
A ribbed double-wall FRP underground fuel tank ready for dispatch

Why choose fibreglass

FRP suits tanks that sit in the ground, hold something corrosive, or have to reach a remote site.

No rust or corrosion

Fibreglass doesn’t rust, inside or out. Underground there is no cathodic protection to maintain, and water tanks need no lining or coating.

Resists chemical attack

With the resin matched to the chemical, FRP resists acids, caustic and process reagents without the coating maintenance a steel tank would need.

Light to ship and place

FRP tanks are light to ship, and a large-capacity water tank fits on one truck bed. Single-wall tanks are easier to lift and quicker to install.

Goes in below the water table

Integral high-profile ribs mean our FRP water tanks are not limited by the water table.

Watertight

Chemical and water tanks are designed to be 100% watertight. Chemical tanks have no on-site sealed joints, and pump stations are one piece.

Little upkeep

FRP water and wastewater tanks need no ongoing maintenance or inspections.

FRP for fuel, chemicals and water

We sell FRP tanks under three brands, one for each application.

Tank Solutions

Underground fuel

Single-wall and double-wall FRP underground tanks for service stations, depots and AdBlue. Double-wall tanks are built to UL 1316.

View underground tanks
GRP Tank Solutions

Chemical storage

FRP tanks for acids, caustic soda, sodium hypochlorite and water treatment chemicals, single-wall or self-bunded, plus scrubbers and stacks.

View chemical tanks
Mullaly Tank Solutions

Water & wastewater

FRP potable water, stormwater and wastewater tanks up to 150,000L for some applications, and one-piece FRP sewage pump stations.

View water tanks

Fibreglass for underground fuel

Our underground fuel tanks are fibreglass, or Glasteel® II steel with an FRP outer wall. Within fibreglass, the choice is single-wall or double-wall.

Double-wall FRP

  • An outer FRP wall surrounds the primary wall completely, for 360° secondary containment
  • Truchek® hydrostatic monitoring of the space between the walls, which meets EPA requirements
  • 2,000L to 150,000L, with 1 to 4 separate compartments
  • 30 years against failure from internal corrosion, and 30 years against structural failure when a qualified contractor performs and validates the installation
  • See double-wall fibreglass fuel tanks and double-wall tanks

Single-wall FRP

  • One FRP wall, light and delivered complete, ready to install
  • Suits water, AdBlue and sites where a quick install matters
  • Where full secondary containment is needed, choose double-wall
  • See FRP single-wall underground tanks

Underground FRP tanks are installed by an accredited installer. A non-accredited installation voids the warranty.

When steel or Glasteel® II suits better

Fibreglass is not the right material for every tank. These are the cases where we would point you to steel.

If you needConsiderWhy
An above-ground fuel tankSteelOur above-ground fuel tanks are steel, built to AS 1692 and AS 1940. Self-bunded tanks need no concrete bund and can be moved later.
A fire rating to cut separation distancesFireguard® 4-hourAn insulated double-wall steel tank that is rated to the SwRI 4-hour fire test and can reduce separation distances by as much as 50%.
A steel structural tank undergroundGlasteel® IIA welded steel tank inside an FRP outer wall. It suits high-head filling where deep burial is required, and pumping in and out in generator applications.

Standards

The standards our FRP tanks are built and tested to, by application. AS 1692 is written for steel tanks, so fibreglass fuel tanks are built to UL 1316 instead.

UL 1316Glass-fibre-reinforced plastic underground storage tanks for petroleum products. Our double-wall FRP fuel tanks are manufactured to meet or exceed it.
AS 4897The design, installation and operation of underground petroleum storage systems. Double-wall FRP tanks get a third-party tank test after installation, using USEPA methods.
AS 1940Underground fuel tank venting must comply with Section 5.4. See our AS 1940 guide.
AS 2634Chemical plant equipment made from glass-fibre reinforced plastics. Applies to our chemical tanks.
BS 4994Design and construction of vessels and tanks in reinforced plastics. Applies to our chemical tanks.
ASME RTP-1Reinforced thermoset plastic corrosion-resistant equipment. Applies to our chemical tanks.
WSA 04Mullaly pump stations have been evaluated through WSAA’s national product appraisal scheme, to the WSA 04 Sewage Pumping Station Code.
ISO 9001Quality management certification at our Tomago NSW and Kwinana Beach WA factories. See accreditation.

General information only, not compliance advice. Your state regulator and site engineer set what applies to your site.

Our FRP tanks

Tank Solutions – Fuel

Double-wall fibreglass fuel tanks

Double-wall FRP tank with 360-degree secondary containment.

Capacity
2,000–150,000L
Standard
UL 1316
Compatible media
Petrol, diesel, alcohols and alcohol–petrol blends
Tank Solutions – Fuel

FRP single-wall underground tanks

Lightweight FRP tank, delivered complete and ready to install.

Capacity
On request
Standard
On request
Compatible media
Fuels, AdBlue and water, depending on the application
Tank Solutions – Fuel

Service station fuel tanks

Double-wall FRP underground fuel tanks for new service stations, upgrades and replacements, with full 360-degree secondary containment.

Capacity
Up to 150,000L
Standard
UL 1316
Compatible media
Petroleum fuels, alcohols and alcohol-gasoline blends
Tank Solutions – Fuel

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.

Capacity
On request
Standard
On request
Compatible media
AdBlue (diesel exhaust fluid, DEF)
GRP – Chemical

FRP chemical storage tanks

Custom-made FRP tanks for acids, caustic soda, sodium hypochlorite, dosing systems and water treatment chemicals, single-wall or bunded.

Capacity
Up to 75,000L above-ground; up to 500,000L underground
Standard
AS 2634, BS 4994, ASME RTP-1
Compatible media
Acids, alkalis and water treatment chemicals, confirmed by concentration
GRP – Chemical

FRP scrubber & stack

FRP chemical fume scrubbers, exhaust and vent stacks, ducting and bio-filters, custom-engineered with the designer or asset owner for odour control and containment.

Capacity
Custom-engineered
Standard
To project spec
Compatible media
Corrosive fume exhaust (process-specific)
Mullaly – Water

Potable water tanks

FRP water storage tanks for drinking water, built with integral fibreglass ribs, premium resin without fillers and a design that is 100% watertight.

Capacity
Up to 150,000L
Standard
On request
Compatible media
Potable (drinking) water
Mullaly – Water

Wastewater & effluent tanks

Underground FRP tanks for wastewater and effluent, corrosion resistant to the stored liquid and the surrounding soil, and designed to be 100% watertight.

Capacity
Up to 150,000L (some applications)
Standard
On request
Compatible media
Wastewater, effluent
Mullaly – Water

Stormwater tanks

Underground FRP tanks for stormwater storage, lightweight to ship and easy to install in remote locations and tight footprints.

Capacity
Up to 150,000L (some applications)
Standard
On request
Compatible media
Stormwater
Mullaly – Water

Fibreglass pump stations

One-piece FRP pump stations built to each project's specification, WSAA appraised and quick to install on site.

Capacity
Custom-engineered
Standard
WSAA appraised
Compatible media
Sewage, wastewater, stormwater

See every tank in the tank finder

Common questions

Can’t see yours? Call NSW +61 2 4964 8270 or WA +61 8 9434 1707.

Fibreglass reinforced plastic. It is a laminate of glass and resin. Our double-wall fibreglass fuel tanks are manufactured to meet or exceed UL 1316, the standard for glass-fibre-reinforced plastic underground storage tanks for petroleum products.
No. Fibreglass doesn’t rust, inside or out, so there is no corrosion to manage and no cathodic protection. FRP water tanks need no protective lining or coating.
Yes. The integral high-profile fibreglass ribs on our water tanks mean they are not limited by the water table.
Double-wall FRP tanks are warranted for petrol, diesel, jet fuel, Avgas, kerosene, fuel and motor oils, ethanol blends (E10, E85) and M85, petrol with up to 20% MTBE or similar ethers, and biodiesel blends up to B20, all at ambient temperature. They are also compatible with AdBlue.
Fibreglass (FRP). It resists acids, caustic and process reagents without the coating maintenance a steel tank in the same duty would need. We match the resin to the chemical and design to AS 2634, BS 4994 and ASME RTP-1. See chemical storage tanks.
No. Filling is by gravity only, because pump or pressure filling could cause overfill or over-pressurisation. Where high-head filling is needed, look at Glasteel® II.

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