Chevron Australia has recommenced production from Train 2 at the Gorgon plant site on Barrow Island, off the northwest coast of Western Australia.
The company discovered weld quality issues in propane heat exchangers on Train 2 in July during a scheduled maintenance.
As a result of the repairs being finished on Train 2, Chevron has gained insights that will contribute to more efficient inspections and potential repairs on Trains 1 and 3, with preparations underway for shutting down Train 1 for inspections.
“The length of the shutdown will be determined by what is discovered during inspections. Following completion of inspections and potential repairs on Train 1, Train 3 will undergo a similar process,” the company outlined in a statement.
“Chevron and the regulator share the same goal of maintaining the safety of our workforce and operating facilities and will maintain alignment on requirements for sequencing of inspections and potential repairs on Trains 1 and 3.”
Last month EnergyQuest reported that maintenance work on Trains 1 and 3 would begin two weeks after the restart of Train 2.
In addition, Chevron received final regulatory approval from WorkSafe to undertake staggered repair work at the plant in October.
A WorkSafe spokesperson said its 24 outstanding notices with Chevron now had to be complied with by various dates out to April 30, 2021.
“The complexity arose because pressure vessels at Gorgon straddled the responsibility of two regulators that independently administer separate acts,” EnergyQuest outlined in its September report.
“The Dangerous Goods Directorate covered Gorgon as it is classified as a major hazard facility. WorkSafe generally does not cover mining and petroleum activities, but the problems at Gorgon came within its remit as pressure vessels were involved,” the report further stated.
The completion of the Train 2 work was delayed after Chevron used the wrong weld procedure, meaning the work had to be ground out and repeated.
“Following our ongoing technical work, we are further refining our approach and have decided some welds in targeted areas will require additional work,” Chevron stated.
The company reassured that the appropriate safety measures are in place and it continues to deliver LNG to customers and gas to the Western Australian domestic market under its contractual commitments with customers.