AN investigation is underway on Curtis Island after Bechtel uncovered suspected sabotage on one of the LNG construction sites.
Gladstone Police were called to the QCLNG site on Monday when Bechtel found a number of chain block lifting devices (winches) that appeared to have been tampered with.
Bechtel Gladstone general manager Kevin Berg said a further investigation prompted suspicions the equipment had been "intentionally damaged".
"A full inspection of the equipment across the site found further suspected tampering had occurred on the same equipment," Mr Berg said.
Workplace Health and Safety and police inspected the site, following discussions over the weekend.
Detective Senior Sergeant Luke Peachey said a number of devices had been missing nuts.
"Workplace Health and Safety are now conducting an investigation, and I'll wait till I see the findings of that before I decide whether it's a police matter," Det Sen Sgt Peachey said.
He said no-one had been injured, but Mr Berg said it was "extremely distressing" that someone might have deliberately put workmates at risk.
"This act goes against our Bechtel Safety Absolutes and we will take immediate action to remove the person or persons responsible from our projects," Mr Berg said.
"And if this is found to be the result of criminal or intentional actions, Bechtel will strongly support any action the regulators and the Queensland Police Service determine to be appropriate."
"Bechtel is working closely with both organisations to fully investigate these incidents on site."
The suspected sabotage was discovered during routine equipment inspections.
About 3000 workers are currently on the QCLNG project.
The $20 billion project is one of three LNG plants under construction on Curtis Island, and is due to deliver first gas next year.