Installing the Triplex Liner Solution

The team at Environmental Rehabilitation Technologies (ERT) has brought the successful McNeil Technologies’ Triplex Liner System to Australia to provide a sustainable solution to the country’s deteriorating underground infrastructure.

Having been successfully installed in hundreds of cities throughout the US, Canada and now Australia, the Triplex Liner System is known for its ease of installation, economy and permanence, and is the ultimate solution for pump station, manhole and culvert cured-in-place rehabilitation.

The system

The deterioration of sewer structures is generally caused by hydrogen sulfide gas, which turns precast concrete to dust and eats away at the mortar between bricks.

The Triplex Liner System is resistant to these chemical reactions, eliminating the risk of further deterioration and infiltration.

Designed and engineered to last up to 100 years, almost always in sewage conditions, the Triplex Liner System can be installed in just a few hours and has an industry-leading warranty of 30 years – unconditionally and non-prorated –  backed by industry-leading supplier and installer McNeil Technologies Inc.

The liners used in the system are composed of two outer layers of fibreglass with a non-porous, impermeable membrane as the middle layer.

As a fully structural liner, this multi-layered system of materials provides structural strength to the host structure, which means it does not require the host structure to be supported.

The system is also chemical resistant and impermeable from groundwater infiltration – it is actually the only rehab system in the world that can be installed whilst there is still active infiltration.

The process

Every single structure is inspected and exacting measurements are recorded along with thorough field notes.

The team at ERT gains a complete understanding of each structure’s needs prior to a liner ever being put into production. A custom liner is then fabricated for each structure.

At the jobsite, the structure is high-pressure cleaned and etched (up to approx 5,000psi). Pipes are trimmed/grouted around as needed.

Benches at the bottom of the structure are rebuilt as needed and a bridge platform is placed just over the invert channel, allowing for uninterrupted flow during the installation.

The liner is then completely saturated inside and out using a signature yellow epoxy resin and lowered into the structure.

Once the liner is in place, it is promptly inflated via an internal inflation bladder, using both steam and air pressure.

The amount of air pressure exerted is in excess of hydrostatic head pressure of infiltration, with the liner bonding to a wet or dry surface. Curing takes place in approximately one hour.

After curing is complete, the inflation bladder is removed, laterals are reopened and the plywood bridge over the invert channel is removed.

Liner installation is then complete, with the total time spent on the rehabilitation usually between four and six hours – and no disruption to sewage flows during the installation.

ERT’s Triplex Liner installations are proudly supported and installed by a team with over 60 years of combined industry experience.

This partner content is brought to you by Environmental Rehabilitation Technologies. For more information, call ERT today on 1800 841 555.

Charlotte Pordage is Editor of Utility magazine, a position she has held since November 2018. She joined the team as an Associate Editor in October 2017, after sharpening her writing and editing skills across a range of print and digital publications. Charlotte graduated from Royal Holloway, University of London, in 2011 with joint honours in English and Latin. When she's not putting together Australia's only dedicated utility magazine, she can usually be found riding her horse or curled up with a good book.

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