The A$200 million (US$143.6 million) contract will see Monadelphous provide maintenance, brownfield modifications and turnaround services to the LNG process plant, support utilities, hull and non-process infrastructure including accommodation and control rooms.
The Australian company will also deliver fabrication services from Darwin, in the Northern Territory, in support of offshore operations at Prelude.
Monadelphous said the contract would run for an initial seven-year period, with a further two two-year extension options.
Shell