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22/12/2014
Zinfra finishes work on NovaPower’s gas supply augmentation project

In April 2014, Zinfra was contracted by APA Group, on behalf of Australian Gas Networks, to undertake gas supply augmentation works for NovaPower’s embedded gas-fired power station. The site is located within an industrial estate in Traralgon, a town in Gippsland, Victoria.

NovaPower’s embedded power station was built to provide ‘network support’ to ensure the reliability of AusNet Services’ electricity supply on high demand days. This solution was more cost effective than an alternative upgrade to the existing electricity substation.

NovaPower’s gas supply for its 10 MW power station in Traralgon was constrained due to a lack of ‘winter’ capacity in the gas distribution network. A new dedicated gas supply line to service the site was needed from the Longford to Dandenong transmission pipeline located 1.4 km north of the Traralgon site. Nova Power contracted with Australian Gas Networks to construct a new dedicated gas supply line from the Longford to Dandenong transmission pipeline.

Zinfra’s Pipelines and Facilities construction division, based in Campbellfield, Victoria, was contracted to complete the construction of the Gas Supply Augmentation project. The project required a transmission pipeline; a custody transfer meter skid; a pressure reduction station; and a new high-pressure gas supply main.

The detailed scope of construction works included:

  • Construction of a Class 600 gas transmission pipeline, including joint coating of the 270 m Class 600 100 NB transmission gas pipeline from the hot tap located on the Longford to Dandenong 750 mm gas transmission pipeline;
  • Construction and installation of a Class 600 pressure reduction station with a water bath heater – including fabrication, assembly, testing, coating, transport and field installation (civil, mechanical and E&I works) within the existing Traralgon city gate station;
  • Construction and installation of the 100 NB custody transfer meter skid including fabrication, assembly, testing, coating, transport and field installation (civil, mechanical and E&I works) within the existing Traralgon city gate station;
  • Construction of a supply main 525 m 150 NB Steel and 675 m 180 mm polyethylene pipe in accordance to AS 4645.2 gas distribution steel pipeline and 4645.3 gas distribution plastic pipe systems; and,
  • Tie-in works including the cut and cap of the existing supply line into NovaPower Traralgon power station.

Zinfra Project Manager Saj Ganegoda said the project included significant project challenges, including:

  • Creek crossing, requiring the shoring up of the creek and diversion of the creek water;
  • Construction of the transmission pipeline, with site flooding near the transmission pipeline offtake a common occurrence;
  • Works completed inside an existing city gate station with existing buried electrical conduits and gas pipelines;
  • The pipeline route crossed over a large existing pipeline, the Exxon Mobil Longford to Long Island crude/condensate and LPG pipelines; and,
  • Tie-in and cut-off on the existing supply line.

NovaPower’s Gas Supply Augmentation Project reached practical completion in August 2014 without a safety incident and to a high quality standard.

NovaPower now has unconstrained gas supplies for its existing 10 MW power plant and could expand to 20 MW in the future if additional support for the local electricity network is needed.

Appeared in issue: Gas Today — Summer 2014/15