OVERPIPE Protection Plates

fitting a curved trench

concrete slab replacement
High impact resistance HDPE for vulnerable buried infrastructure protection

OVERPIPE Protection Plates

The OVERPIPE HDPE mechanical protection plate was developed with GDF Suez (now Engie) R&D to provide an innovative alternative to concrete slabs. They are exclusively distributed in Australasia by Polyfabrics.

Overpipe plates have been tested rigorously to meet the requirements of mechanical protection under AS2885. Overpipe is 15 mm thick and up to 2000 mm long, coming in widths from 570mm up to 2000 mm. Overpipe is designed to protect large diameter buried pipelines (high pressure gas, hydrocarbons, potable water etc…), high voltage cables, critical water pipelines and communication cables.

50 Year Warranty

Made from injection moulded virgin HDPE, Overpipe plates perform consistently without splitting or cracking under penetrative attack. Most importantly, backed by a 50 year warranty, Overpipe provides long term mechanical protection for any vulnerable buried assets. Overpipe is the solution, when the possibility of 3rd party interference is an unacceptable risk to public safety and/or interruption of service.

Overpipe Installation

Quick to install, no specialist lifting machinery is required – reducing installation costs. Overpipe plates can in fact be reused after a pipeline has been uncovered for maintenance. The perforated plastic plates do not interfere with cathodic protection testing.

Approvals by Utilities

The Overpipe Protection Plate fits the requirements of numerous utilities globally including Gaz de France, Saudi Aramco, Petronas, Total, Air Liquide & Fluxys, regarding the transportation by pipeline of high pressure gas.

In Australia & New Zealand, Overpipe plates have now been approved for use above hydrocarbon pipelines by APA, Jemena, QGC, Shell, Sea Gas, Epic Energy, Tas Gas, Santos, First Gas & Vector.

Overpipe is also being used to protect shallow buried power and optic fiber cables , such as by Vic Track on the Mernda Rail Extension.

Overpipe Features

  • Made from an injection moulded virgin HDPE polymer for consistency & strength.
  • Holes across the surface of the plate allow the flow of water and no disruption of cathodic protection measurement. The holes are made by moulding and not by later drilling which would weaken the plates.
  • The moulded non-slip surface on both sides helps handling and avoids slip and fall accidents.
  • Coloured and UV resistant to be an effective warning signal. Overpipe can be produced in different colours depending on the nature of the utility.
  • Customizable warning message, moulded in relief into the surface.
  • Light weight (15 to 40 kilograms depending on the model), Overpipe is easy to install and remove to allow inspection or repair of the pipeline.
  • The plates can be butted end to end or for total protection, overlapped using a unique clip system.


Code Product Description Size(mm) Weight Colour Qty per Pallet
811008 OVERPIPE OV5 570 Gas 570 x 1500 x 15 11.55 yellow 50
811009 OVERPIPE OV6 820 Gas 820 x 1500 x 15 18.45 yellow 50
811020 OVERPIPE OV1 1250 Gas 1250 x 2000 x 15 30.8 yellow 30
811011 OVERPIPE OV2 1400 Gas 1400 x 1800 x 15 34.25 yellow 30
811021 OVERPIPE OV3 1500 Gas 1500 x 2000 x 15 36.7 yellow 30
811014 OVERPIPE OV4 1600 Gas 1600 x 1800 x 15 39.2 yellow 30
811013 OVERPIPE OV3 1500 COMMS 1500 X 1800 X 15 36.7 white 30

Further Information

For enquiries contact: sales@polyfabrics.com.au


Overpipe - Mernda Rail Case Study
OVERPIPE – Mernda Rail Case Study
OVERPIPE Dimensions
OVERPIPE NATA Testing Report
OVERPIPE NATA Testing Report
Tapex Group

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