The upgrade has increased the pipeline’s maximum allowable operational pressure from 7.4 megapascals (MPa) to 8.8 MPa, and has therefore increased its gas transportation capacity into New South Wales.

The upgrade project was initiated by the installation of two new compressors at the existing Wollert Compressor Station. Comdain was responsible for the supply and installation of mechanical, electrical and instrumentation works completed at the Euroa site, for future compressor installation.

The company provided labour, materials, supervision, consumables, risk assessments and work procedures for main works including the fabrication and installation of all main process gas piping, valves and fittings. Comdain ensured delivery of all pipe work, piping skids, piping supports and all structural steelwork.

Comdain also led the inspection and testing efforts, welding and testing recording and environmental management plans.

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Comdain has said that the greatest challenge faced during the works was ensuring that there was no disruption to the gas supply for the north. In order to maintain supply, a bypass was constructed at the Euroa site to enable continuous supply while civil works were undertaken onsite.

Another challenge was the fabrication of a sizeable valve assembly, completed in a Comdain workshop and then delivered onsite.

Victoria’s cold weather during the winter months of 2010 resulted in a greater demand for gas, and increased the potential risks associated with gas works. The key risk is the potential for gas supply to be interrupted. This is increased during the cold weather because the increased consumption of gas for heating increases the potential for loss if a failure of supply occurs.

Comdain said that risks were contained by a risk assessment with APA Gasnet and the Australian Energy Market Operator.

Comdain performed the job without incident, within budget and on time, according to APA Group Project Manager David Thek.

“The timing of works at Euroa was impacted by regulatory and operational requirements,” Mr Thek said.

“The co-operative approach between Comdain and APA on the project allowed the impacts to be minimised, with Comdain being able to react to changes and reschedule works in consultation with APA.

“This co-operative approach ensured that APA had the ability to deal with operators and regulators with confidence, and helped to mitigate the impact of operational delays to the project,” Comdain said.