Wayatinah Penstocks

In 2016, McElligotts was contracted by Hydro Tasmania to remediate the Wayatinah Penstocks in Wayatinah, Tasmania. An important part of Tasmania’s power systems, the Wayatinah Penstocks are a group of three steel penstocks that run 220m into 3 spiral castings, powering the hydroelectric run of the river Wayatinah Power Station.

To begin the project, McElligott’s first had to remove the existing coating of coal tar using ultra high water, pumping the waste water back to the top and treating it so it could be re used back through the system. This was important to us as we are a company that values sustainability, so we made every effort to reduce water waste during this project

After removing the existing coating, we were able to set up the abrasive blasting robotic system so that we could achieve a class 3 blast and also apply a holding primer to keep the abrasive coating in place. Once the abrasive blasting and waste garner was removed and cleaned, the welds and pitted areas were stripe coated.

Finally, the spray robotic system was put into each of the penstocks to apply one full coat at 500 microns, which saw the project complete at two years after the start date.

McElligotts were proud to have been able to play a part in remediating one of Tasmania’s most important power systems, which proved to be a rewarding experience.

Penstocks Restoration

Cape Wickham Lighthouse

Situated on King Island, Tasmania, the Cape Wickham Lighthouse is Australia’s tallest lighthouse, standing 48 metres tall. Built in 1861, the lighthouse is constructed of local stone, has walls 3.4 metres thick at the base and 11 flights of stairs each with 20 steps. The lighthouse was originally lit with a single oil wick burner with an acetylene flasher before finally being replaced with a lightbulb in 1918. Shortly after in 1921, the light was permanently switched off after the superintendent’s house was demolished. Now, the lighthouse is an iconic tourist destination in Tasmania, so it’s important that the lighthouse is upheld to standard.

In February 2019, McElligott’s were engaged by the Australian Maritime Safety Authority to complete the rehabilitation and painting of the lighthouse. The main job was to remove the existing lead-based coatings and replace them with a modern protective coating system. In addition, we were asked to repair and stabilise the cracking in the concrete balcony and internal lantern room floor support corbel, repoint the iconic stone work, repair corrosion and damage to metallic substrates, replace the ground floor external stairway stringer and re-glaze the lantern room and timber windows.

Trevallyn Dam Conduit Relining

Trevallyn Dam was built in 1955 and McElligotts are proud to have assisted in maintaining this historic piece of Tasmanian infrastructure. As part of the remediation process to keep Trevallyn Dam in good shape, our team stripped and re-lined three 30m x 1500mm conduits. This project required a quick turnaround, owing to rising dam levels.

Our team were required to abrasive blast the existing coal tar epoxy lining, which had heavy surface pitting, posing some challenges with surface preparation. From there, we repainted the conduit internals with a protective coating suited to the client’s needs. Our team had to deal with water leaks from stoplogs stream throughout the painting process, but we developed processes to ensure the quality was not compromised.

Hydro Tasmania Meadowbank

McElligotts works with Hydro Tasmania to conduct remedial maintenance works on their infrastructure facilities around the state. We work on everything from dam and penstock infrastructure to turbine and power station internal works. Much of our work centres on removal of lead-based paint (as lots of these structures were built many decades ago), abrasive blasting, protective coating and lining and surface preparation.

This particular project was at the Hydro Tasmania Meadowbank facility. We were involved in painting two different types of protective coating systems on the upstream and downstream sides of crest gates, each spanning 35 metres.
When our client requested an earlier deadline, we established night shifts during critical parts of the project. Difficulties we had to overcome included poor access and weather (sub zero, high winds and waves). One of the key measures of success we take away from each project is our safety record, and we completed this project in 3000 man hours with no incidents to report.

Batman Bridge Protective Coating

Located to the North of the Tamar River is Batman Bridge, providing a vital link between West and East Tamar. This structure spans over 430 metres, requiring robust protective coating from the corrosion-inducive environment below. Our abrasive blasting and protective coating work is conducted from a motorised gantry, purpose-built for our remedial maintenance works. All protective coating is conducted in an encapsulated area.

The Batman bridge was built in 1968 and was one of the first cable-stayed structures in the world.

Musselroe Wind Farm

McElligotts was contracted to apply protective coatings on wind turbine structures as part of the Musselroe Wind Farm from 2013 – 2014. Our team worked with Haywards Steel Fabrication and Construction, who supplied 56 Vesta Towers for this project. This was possibly one of the largest, most intense projects we’ve completed in our 60-year history. Approximately 87,000 square metres of steel was prepared using over 70,000L of paint, comprising of a three-coat specialised protection system supplied by Hempel.

Part of this project even included expanding our own Launceston facilities to ensure we could efficiently paint these large structures to scheduled delivery times. The painting process included presence of full time 3rd party inspectors to ensure all specifications were met precisely. Each tower comprised of three sections, up to 30m in length and weighing between 47 and 60 tonnes each.

The Musselroe Wind Farm provides power to 50,000 Tasmanian homes and we’re proud to have been a part of this vital infrastructure project. Check out the video below to watch McElligott’s Director, John McElligott, discuss this project in more detail.