Offshore workers on Esso's Bass Strait oil and gas rigs have stepped up their fight against roster changes.
Victorian-based contract maintenance crews are now threatening to strike for 100 days.
The Construction, Forestry, Mining and Energy Union has told the Industrial Relations Commission more than 50 workers will go on strike from tomorrow.
The union's John Parker says the action will not interrupt oil and gas supplies.
"It's been going for 18 months and it's just been a difficult dispute," he said.
Peter Nolan from the Australian Industry Group has urged workers and their unions to call off the strike.
"One hundred days is a pretty extreme period of time but that's what they've chosen to do," he said.
Workers will meet at the Longford gas plant on Saturday.
28 October 2004
ABC News Online